CHANGELOG.md

Release Notes
=============

All notable changes to this project will be documented in this file.

GRDB adheres to [Semantic Versioning](https://semver.org/), with one exception: APIs flagged [**:fire: EXPERIMENTAL**](README.md#what-are-experimental-features). Those are unstable, and may break between any two minor releases of the library.

#### 7.x Releases

- `7.10.x` Releases - [7.10.0](#7100)
- `7.9.x` Releases - [7.9.0](#790)
- `7.8.x` Releases - [7.8.0](#780)
- `7.7.x` Releases - [7.7.0](#770) - [7.7.1](#771)
- `7.6.x` Releases - [7.6.0](#760) - [7.6.1](#761)
- `7.5.x` Releases - [7.5.0](#750)
- `7.4.x` Releases - [7.4.0](#740) - [7.4.1](#741)
- `7.3.x` Releases - [7.3.0](#730)
- `7.2.x` Releases - [7.2.0](#720)
- `7.1.x` Releases - [7.1.0](#710)
- `7.0.x` Releases - [7.0.0](#700)
- `7.0.0` Betas - [7.0.0-beta](#700-beta) - [7.0.0-beta.2](#700-beta2) - [7.0.0-beta.3](#700-beta3) - [7.0.0-beta.4](#700-beta4) - [7.0.0-beta.5](#700-beta5) - [7.0.0-beta.6](#700-beta6) - [7.0.0-beta.7](#700-beta7)

#### 6.x Releases

- `6.29.x` Releases - [6.29.0](#6290) - [6.29.1](#6291) - [6.29.2](#6292) - [6.29.3](#6293)
- `6.28.x` Releases - [6.28.0](#6280)
- `6.27.x` Releases - [6.27.0](#6270)
- `6.26.x` Releases - [6.26.0](#6260)
- `6.25.x` Releases - [6.25.0](#6250)
- `6.24.x` Releases - [6.24.0](#6240) - [6.24.1](#6241) - [6.24.2](#6242)
- `6.23.x` Releases - [6.23.0](#6230)
- `6.22.x` Releases - [6.22.0](#6220)
- `6.21.x` Releases - [6.21.0](#6210)
- `6.20.x` Releases - [6.20.0](#6200) - [6.20.1](#6201) - [6.20.2](#6202)
- `6.19.x` Releases - [6.19.0](#6190)
- `6.18.x` Releases - [6.18.0](#6180)
- `6.17.x` Releases - [6.17.0](#6170)
- `6.16.x` Releases - [6.16.0](#6160)
- `6.15.x` Releases - [6.15.0](#6150) - [6.15.1](#6151)
- `6.14.x` Releases - [6.14.0](#6140)
- `6.13.x` Releases - [6.13.0](#6130)
- `6.12.x` Releases - [6.12.0](#6120)
- `6.11.x` Releases - [6.11.0](#6110)
- `6.10.x` Releases - [6.10.0](#6100) - [6.10.1](#6101) - [6.10.2](#6102)
- `6.9.x` Releases - [6.9.0](#690) - [6.9.1](#691) - [6.9.2](#692)
- `6.8.x` Releases - [6.8.0](#680)
- `6.7.x` Releases - [6.7.0](#670)
- `6.6.x` Releases - [6.6.0](#660) - [6.6.1](#661)
- `6.5.x` Releases - [6.5.0](#650)
- `6.4.x` Releases - [6.4.0](#640)
- `6.3.x` Releases - [6.3.0](#630) - [6.3.1](#631)
- `6.2.x` Releases - [6.2.0](#620)
- `6.1.x` Releases - [6.1.0](#610)
- `6.0.x` Releases - [6.0.0](#600)
- `6.0.0` Betas - [6.0.0-beta](#600-beta) - [6.0.0-beta.2](#600-beta2) - [6.0.0-beta.3](#600-beta3) - [6.0.0-beta.4](#600-beta4)

#### 5.x Releases

- `5.26.x` Releases - [5.26.0](#5260) - [5.26.1](#5261)
- `5.25.x` Releases - [5.25.0](#5250)
- `5.24.x` Releases - [5.24.0](#5240) - [5.24.1](#5241)
- `5.23.x` Releases - [5.23.0](#5230)
- `5.22.x` Releases - [5.22.0](#5220) - [5.22.1](#5221) - [5.22.2](#5222)
- `5.21.x` Releases - [5.21.0](#5210)
- `5.20.x` Releases - [5.20.0](#5200)
- `5.19.x` Releases - [5.19.0](#5190)
- `5.18.x` Releases - [5.18.0](#5180)
- `5.17.x` Releases - [5.17.0](#5170)
- `5.16.x` Releases - [5.16.0](#5160)
- `5.15.x` Releases - [5.15.0](#5150)
- `5.14.x` Releases - [5.14.0](#5140)
- `5.13.x` Releases - [5.13.0](#5130)
- `5.12.x` Releases - [5.12.0](#5120)
- `5.11.x` Releases - [5.11.0](#5110)
- `5.10.x` Releases - [5.10.0](#5100)
- `5.9.x` Releases - [5.9.0](#590)
- `5.8.x` Releases - [5.8.0](#580)
- `5.7.x` Releases - [5.7.0](#570) - [5.7.1](#571) - [5.7.2](#572) - [5.7.3](#573) - [5.7.4](#574)
- `5.6.x` Releases - [5.6.0](#560)
- `5.5.x` Releases - [5.5.0](#550)
- `5.4.x` Releases - [5.4.0](#540)
- `5.3.x` Releases - [5.3.0](#530)
- `5.2.x` Releases - [5.2.0](#520)
- `5.1.x` Releases - [5.1.0](#510)
- `5.0.x` Releases - [5.0.0](#500) - [5.0.1](#501) - [5.0.2](#502) - [5.0.3](#503)
- `5.0.0` Betas - [5.0.0-beta](#500-beta) - [5.0.0-beta.2](#500-beta2) - [5.0.0-beta.3](#500-beta3) - [5.0.0-beta.4](#500-beta4) - [5.0.0-beta.5](#500-beta5) - [5.0.0-beta.6](#500-beta6) - [5.0.0-beta.7](#500-beta7) - [5.0.0-beta.8](#500-beta8) - [5.0.0-beta.9](#500-beta9) - [5.0.0-beta.10](#500-beta10) - [5.0.0-beta.11](#500-beta11)

#### 4.x Releases

- `4.14.x` Releases - [4.14.0](#4140)
- `4.13.x` Releases - [4.13.0](#4130)
- `4.12.x` Releases - [4.12.0](#4120) - [4.12.1](#4121) - [4.12.2](#4122)
- `4.11.x` Releases - [4.11.0](#4110)
- `4.10.x` Releases - [4.10.0](#4100)
- `4.9.x` Releases - [4.9.0](#490)
- `4.8.x` Releases - [4.8.0](#480) - [4.8.1](#481)
- `4.7.x` Releases - [4.7.0](#470)
- `4.6.x` Releases - [4.6.0](#460) - [4.6.1](#461) - [4.6.2](#462)
- `4.5.x` Releases - [4.5.0](#450)
- `4.4.x` Releases - [4.4.0](#440)
- `4.3.x` Releases - [4.3.0](#430)
- `4.2.x` Releases - [4.2.0](#420) - [4.2.1](#421)
- `4.1.x` Releases - [4.1.0](#410) - [4.1.1](#411)
- `4.0.x` Releases - [4.0.0](#400) - [4.0.1](#401)

#### 3.x Releases

- `3.7.x` Releases - [3.7.0](#370)
- `3.6.x` Releases - [3.6.0](#360) - [3.6.1](#361) - [3.6.2](#362)
- `3.5.x` Releases - [3.5.0](#350)
- `3.4.x` Releases - [3.4.0](#340)
- `3.3.x` Releases - [3.3.0](#330) - [3.3.1](#331)
- `3.3.0` Betas - [3.3.0-beta1](#330-beta1)
- `3.2.x` Releases - [3.2.0](#320)
- `3.1.x` Releases - [3.1.0](#310)
- `3.0.x` Releases - [3.0.0](#300)

#### 2.x Releases

- `2.10.x` Releases - [2.10.0](#2100)
- `2.9.x` Releases - [2.9.0](#290)
- `2.8.x` Releases - [2.8.0](#280)
- `2.7.x` Releases - [2.7.0](#270)
- `2.6.x` Releases - [2.6.0](#260) - [2.6.1](#261)
- `2.5.x` Releases - [2.5.0](#250)
- `2.4.x` Releases - [2.4.0](#240) - [2.4.1](#241) - [2.4.2](#242)
- `2.3.x` Releases - [2.3.0](#230) - [2.3.1](#231)
- `2.2.x` Releases - [2.2.0](#220)
- `2.1.x` Releases - [2.1.0](#210)
- `2.0.x` Releases - [2.0.0](#200) - [2.0.1](#201) - [2.0.2](#202) - [2.0.3](#203)

#### 1.x Releases

- `1.3.x` Releases - [1.3.0](#130)
- `1.2.x` Releases - [1.2.0](#120) - [1.2.1](#121) - [1.2.2](#122)
- `1.1.x` Releases - [1.1.0](#110)
- `1.0.x` Releases - [1.0.0](#100)

#### 0.x Releases

- [0.110.0](#01100), ...

---

## 7.10.0

Released February 15, 2025

- **Documentation fixes** by [@bellebethcooper](https://github.com/bellebethcooper), [@Cykelero](https://github.com/Cykelero), and [@leejungyeob](https://github.com/leejungyeob) in [#1842](https://github.com/groue/GRDB.swift/pull/1842), [#1846](https://github.com/groue/GRDB.swift/pull/1846), [#1848](https://github.com/groue/GRDB.swift/pull/1848)
- **New**: Linux adjustments by [@thinkpractice](https://github.com/thinkpractice) in [#1825](https://github.com/groue/GRDB.swift/pull/1825)
- **New**: SQLCipher adjustments by [@R4N](https://github.com/R4N) in [#1845](https://github.com/groue/GRDB.swift/pull/1845)
- **New**: Android and Windows adjustments by [@marcprux](https://github.com/marcprux) in [#1849](https://github.com/groue/GRDB.swift/pull/1849), [#1850](https://github.com/groue/GRDB.swift/pull/1850)
- **New**: Configure whether UPSERT should update all columns, or no column by [@groue](https://github.com/groue) in [#1852](https://github.com/groue/GRDB.swift/pull/1852)

## 7.9.0

Released December 13, 2025

- **Breaking Change**: Simplify the compiler checks for the availability of SQLite snapshots by [@groue](https://github.com/groue) in [#1826](https://github.com/groue/GRDB.swift/pull/1826)

    This change aims at easing Linux and Android compatibility.
    
    **The library requirements are raised to Swift 6.1+, Xcode 16.3+.**

- **Breaking Change**: Accept multiple SQLCipher libraries by [@groue](https://github.com/groue) in [#1819](https://github.com/groue/GRDB.swift/pull/1819)

    This change aims at easing building GRDB against various SQLCipher flavors.
    
    **The compiler flag that enables new GRDB APIs for SQLCipher is now `SQLITE_HAS_CODEC`.**

- **Fixed**: Fix cancellation of async tasks that use the FTS5 full-text engine by [@groue](https://github.com/groue) in [#1839](https://github.com/groue/GRDB.swift/pull/1839)

    This workarounds an [SQLite bug](https://sqlite.org/forum/forumpost/95413eb410) that would trigger a GRDB crash, and improves the robustness of the library regarding database accesses cancellation and database interruption.

- **New**: Improve the ergonomics of `DatabaseMigrator.registerMigration(_:foreignKeyChecks:merging:migrate)`, introduced in [#1818](https://github.com/groue/GRDB.swift/pull/1818), by accepting that the name of the merged migration is included in the set of merged migrations:

    ```swift
    // Used to fail, now OK:
    migrator.registerMigration("v3", merging: ["v1", "v2", "v3"]) { ... }
    //                         ~~~~                        ~~~~
    
    // The above code is equivalent to:
    migrator.registerMigration("v3", merging: ["v1", "v2"]) { ... }
    ```

## 7.8.0

Released October 2, 2025

- **New**: Merged Migrations by [@groue](https://github.com/groue) in [#1818](https://github.com/groue/GRDB.swift/pull/1818)

## 7.7.1

Released September 29, 2025

- **Fixed**: Fix the save() method for record types with attached triggers by [@groue](https://github.com/groue) in [#1822](https://github.com/groue/GRDB.swift/pull/1822)

## 7.7.0

Released September 23, 2025

- **New**: Update GRDB7MigrationGuide.md reference by [@emmanuel-ferdman](https://github.com/emmanuel-ferdman) in [#1807](https://github.com/groue/GRDB.swift/pull/1807)
- **New**: Persistable Database Views by [@groue](https://github.com/groue) in [#1810](https://github.com/groue/GRDB.swift/pull/1810)
- **New**: Support for Xcode 26 by [@groue](https://github.com/groue) in [#1813](https://github.com/groue/GRDB.swift/pull/1813)
- **Fixed**: Fix another race condition regarding Task cancellation, completing [#1797](https://github.com/groue/GRDB.swift/pull/1797)

## 7.6.1

Released July 23, 2025

- **Fixed**: Fix race condition regarding Task cancellation by [@groue](https://github.com/groue) in [#1797](https://github.com/groue/GRDB.swift/pull/1797)
 
## 7.6.0

Released July 20, 2025

- **New**: All closures that accept DatabaseComponents can throw by [@groue](https://github.com/groue) in [#1768](https://github.com/groue/GRDB.swift/pull/1768)
- **New**: Add Sendable conformance to DatabasePreUpdateEvent.Kind, matching DatabaseEvent.Kind by [@Jason-Abbott](https://github.com/Jason-Abbott) in [#1773](https://github.com/groue/GRDB.swift/pull/1773)
- **New**: Add custom build instruction for hardened runtime by [@Jason-Abbott](https://github.com/Jason-Abbott) in [#1776](https://github.com/groue/GRDB.swift/pull/1776)
- **New**: Access task locals from asynchronous database accesses by [@groue](https://github.com/groue) in [#1794](https://github.com/groue/GRDB.swift/pull/1794)
- **New**: Throwing row accessors by [@groue](https://github.com/groue) in [#1796](https://github.com/groue/GRDB.swift/pull/1796)

## 7.5.0

Released May 11, 2025

- **New**: Make it possible to create a raw FTS5Pattern without any database connection by [@groue](https://github.com/groue) in [#1764](https://github.com/groue/GRDB.swift/pull/1764)
- **New**: Build request with closures by [@groue](https://github.com/groue) in [#1759](https://github.com/groue/GRDB.swift/pull/1759)

## 7.4.1

Released March 28, 2025

- Removed a compiler warning

## 7.4.0

Released March 22, 2025

- **New**: Add the MIN and MAX multi-argument SQL functions to the query interface by [@groue](https://github.com/groue) in [#1745](https://github.com/groue/GRDB.swift/pull/1745)
- **Fixed**: Transaction observers are not impacted by Task Cancellation by [@groue](https://github.com/groue) in [#1747](https://github.com/groue/GRDB.swift/pull/1747). This fixes unexpected `ValueObservation` failures in applications that perform asynchronous writes.

## 7.3.0

Released February 23, 2025

- **New**: Support for temporary virtual tables by [@groue](https://github.com/groue) in [#1731](https://github.com/groue/GRDB.swift/pull/1731)
- Fixed a compiler error in Xcode 16.3 beta ([#1729](https://github.com/groue/GRDB.swift/pull/1729), [#1730](https://github.com/groue/GRDB.swift/pull/1730))

## 7.2.0

Released February 12, 2025

- **New**: Select ids with selectID() by [@groue](https://github.com/groue) in [#1719](https://github.com/groue/GRDB.swift/pull/1719)

## 7.1.0

Released February 5, 2025

- **New**: Expose `sqlite3_libversion_number` as `Database.sqliteLibVersionNumber` by [@groue](https://github.com/groue) in [#1713](https://github.com/groue/GRDB.swift/pull/1713)
- **Fixed**: DatabaseQueue restores its read/write abilities when an async read-only database access is cancelled by [@groue](https://github.com/groue) in [#1716](https://github.com/groue/GRDB.swift/pull/1716)
- **New**: Allow RxGRDB to compile without warning by [@groue](https://github.com/groue) in [#1717](https://github.com/groue/GRDB.swift/pull/1717)

## 7.0.0

Released January 26, 2025

- **New**: Support for JSONB expressions by [@groue](https://github.com/groue) in [#1699](https://github.com/groue/GRDB.swift/pull/1699)
- **Breaking Change**: Fix inflections of Bias, Focus, Gas, and Lens by [@groue](https://github.com/groue) in [#1703](https://github.com/groue/GRDB.swift/pull/1703)

## 7.0.0-beta.7

Released January 19, 2025

- **New**: Select all columns from a table, but a few ones by [@groue](https://github.com/groue) in [#1700](https://github.com/groue/GRDB.swift/pull/1700)
- **Fixed**: Fix typo in Readme.md by [@kevinlg](https://github.com/kevinlg) in [#1697](https://github.com/groue/GRDB.swift/pull/1697)
- **New**: Bump custom SQLite to 3.47.2 by [@groue](https://github.com/groue) in [#1696](https://github.com/groue/GRDB.swift/pull/1696)
- **Fixed**: Update LICENSE, fix copyright license year by [@JasonnnW3000](https://github.com/JasonnnW3000) in [#1695](https://github.com/groue/GRDB.swift/pull/1695)
- **Fixed**: Core: import `ucrt` on Windows for `strcmp` by [@compnerd](https://github.com/compnerd) in [#1662](https://github.com/groue/GRDB.swift/pull/1662)
- **Fixed**: Foundation: elide extensions on Windows to match Linux by [@compnerd](https://github.com/compnerd) in [#1661](https://github.com/groue/GRDB.swift/pull/1661)
- **Fixed**: Docs: fixes typos "FST"->"FTS" by [@nylki](https://github.com/nylki) in [#1660](https://github.com/groue/GRDB.swift/pull/1660)

## 7.0.0-beta.6

Released October 13, 2024

- **New**: Bump custom SQLite builds to 3.46.1 by [@groue](https://github.com/groue) in [#1654](https://github.com/groue/GRDB.swift/pull/1654)

## 7.0.0-beta.5

Released October 13, 2024

- **Fixed**: Fix DatabaseMigrator.hasSchemaChanges failing for readonly connections by [@Jnosh](https://github.com/Jnosh) in [#1653](https://github.com/groue/GRDB.swift/pull/1653)
- **Documentation Update**: Enhance the database schema documentation by [@groue](https://github.com/groue) in [#1652](https://github.com/groue/GRDB.swift/pull/1652)

## 7.0.0-beta.4

Released October 12, 2024

- **New**: Allow applications to handle DatabaseMigrator schema changes by [@groue](https://github.com/groue) in [#1651](https://github.com/groue/GRDB.swift/pull/1651)

## 7.0.0-beta.3

Released October 6, 2024

- **Fix**: use #if directives to conditionally @preconcurrency import the Dispatch module to enable building the package on linux by [@tayloraswift](https://github.com/tayloraswift) in [#1644](https://github.com/groue/GRDB.swift/pull/1644)
- **New**: Add coalesce free function and Row method by [@philmitchell](https://github.com/philmitchell) in [#1645](https://github.com/groue/GRDB.swift/pull/1645)
- **Documentation Update**: Add `DatabaseValueConvertible` tip for JSON columns by [@bok-](https://github.com/bok-) in [#1649](https://github.com/groue/GRDB.swift/pull/1649)

## 7.0.0-beta.2

Released September 29, 2024

- **Fix**: Update .spi.yml by [@finestructure](https://github.com/finestructure) in [#1643](https://github.com/groue/GRDB.swift/pull/1643)

## 7.0.0-beta

Released September 29, 2024

**GRDB 7 brings full support for Swift 6.**

[Migrating From GRDB 6 to GRDB 7](Documentation/GRDB7MigrationGuide.md) describes in detail how to bump the GRDB version in your application.

The new [Swift Concurrency and GRDB](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/swiftconcurrency) guide explains how to best integrate GRDB and Swift Concurrency.

The [demo app](Documentation/DemoApps/) was rewritten from scratch in a brand new Xcode 16 project.

- **Breaking Change**: Bump requirements by [@groue](https://github.com/groue) in [#1598](https://github.com/groue/GRDB.swift/pull/1598) and [#1634](https://github.com/groue/GRDB.swift/pull/1634)
- **Breaking Change**: Enhance ergonomics of record methods that insert/save/upsert and fetch by [@groue](https://github.com/groue) in [#1599](https://github.com/groue/GRDB.swift/pull/1599)
- **Breaking Change**: Rename the CSQLite module to GRDBSQLite, and stop exporting the C SQLite functions by [@groue](https://github.com/groue) in [#1600](https://github.com/groue/GRDB.swift/pull/1600)
- **Breaking Change**: Perform all writes with immediate transactions by default by [@groue](https://github.com/groue) in [#1602](https://github.com/groue/GRDB.swift/pull/1602)
- **Breaking Change**: Remove DatabasePool.concurrentRead by [@groue](https://github.com/groue) in [#1603](https://github.com/groue/GRDB.swift/pull/1603)
- **Breaking Change**: Coding strategies depend on the column by [@groue](https://github.com/groue) in [#1606](https://github.com/groue/GRDB.swift/pull/1606)
- **Breaking Change**: Add missing Sendable conformances by [@groue](https://github.com/groue) in [#1607](https://github.com/groue/GRDB.swift/pull/1607) and [#1639](https://github.com/groue/GRDB.swift/pull/1639)
- **Breaking Change**: Async database accesses honor Task cancellation by [@groue](https://github.com/groue) in [#1610](https://github.com/groue/GRDB.swift/pull/1610)
- **Breaking Change**: Prefer Collection over Sequence for filter(keys:) and related APIs by [@groue](https://github.com/groue) in [#1617](https://github.com/groue/GRDB.swift/pull/1617)
- **Breaking Change**: MainActor ValueObservation scheduling by [@groue](https://github.com/groue) in [#1633](https://github.com/groue/GRDB.swift/pull/1633)
- **Breaking Change**: Prefer any DatabaseReader and DatabaseWriter by [@groue](https://github.com/groue) in [#1635](https://github.com/groue/GRDB.swift/pull/1635)
- **New**: Sendable database accesses by [@groue](https://github.com/groue) in [#1618](https://github.com/groue/GRDB.swift/pull/1618)
- **New**: DatabaseCursor has a primary associated type by [@groue](https://github.com/groue) in [#1605](https://github.com/groue/GRDB.swift/pull/1605)

## 6.29.3

Released September 7, 2024

- **Fixed**: [#1613](https://github.com/groue/GRDB.swift/pull/1613) by [@groue](https://github.com/groue): Avoid SQLite misuse when releasing memory on a closed database connection

## 6.29.2

Released August 24, 2024

- **New**: [#1593](https://github.com/groue/GRDB.swift/pull/1593) by [@mingchen](https://github.com/mingchen): Fix sample code in README

## 6.29.1

Released August 7, 2024

- **New**: [#1579](https://github.com/groue/GRDB.swift/pull/1579) by [@groue](https://github.com/groue): Modernize the demo apps
- **New**: [#1584](https://github.com/groue/GRDB.swift/pull/1584) by [@SagarSDagdu](https://github.com/SagarSDagdu): Update README to highlight deployment issue with CocoaPods
- **New**: [#1589](https://github.com/groue/GRDB.swift/pull/1589) by [@groue](https://github.com/groue): Fix compilation issue with Xcode 16 beta 5 due to a missing import

## 6.29.0

Released July 20, 2024

- **New**: [#1574](https://github.com/groue/GRDB.swift/pull/1574) by [@sroebert](https://github.com/sroebert): Support for single value decoding (the complement of [#1570](https://github.com/groue/GRDB.swift/pull/1570) shipped in 6.28.0)
- **New**: [#1575](https://github.com/groue/GRDB.swift/pull/1575) by [@Jason-Abbott](https://github.com/Jason-Abbott): Show comments when tracing expanded statements

## 6.28.0

Released July 11, 2024

- **New**: [#1570](https://github.com/groue/GRDB.swift/pull/1570) by [@groue](https://github.com/groue): Support single-value encoding
- **New**: Added `QueryInterfaceRequest.deleteAndFetchIds(_:)` which returns the set of deleted ids.
- **New**: Added `Set` methods `union`, `formUnion`, `intersection` and `formIntersection` that accept a cursor.
- **New**: `DatabaseUUIDEncodingStrategy` is Sendable.

## 6.27.0

Released April 21, 2024

- **Fixed**: [#1533](https://github.com/groue/GRDB.swift/pull/1533) by [@groue](https://github.com/groue): Fix a bug in Decodable support
- **Documentation Update**: [#1534](https://github.com/groue/GRDB.swift/pull/1534) The [Single-Row Tables](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/singlerowtables) guide was updated with guidance about default configuration values.
- **Documentation Update**: [#1535](https://github.com/groue/GRDB.swift/pull/1535) The [ValueObservation Scheduling](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/valueobservation#ValueObservation-Scheduling) documentation chapter explains the default behavior of `ValueObservation` fetches, and explains how to make sure they are never performed on the main thread.

## 6.26.0

Released March 23, 2024

- **New**: [#1503](https://github.com/groue/GRDB.swift/pull/1503) by [@simba909](https://github.com/simba909): Conform Database.ColumnType to Sendable
- **New**: [#1510](https://github.com/groue/GRDB.swift/pull/1510) by [@groue](https://github.com/groue): Add Sendable conformances and unavailabilities
- **New**: [#1511](https://github.com/groue/GRDB.swift/pull/1511) by [@groue](https://github.com/groue): Database schema dump
- **New**: [#1515](https://github.com/groue/GRDB.swift/pull/1515) by [@groue](https://github.com/groue): Support for the CAST SQLite function
- **Fixed**: [#1508](https://github.com/groue/GRDB.swift/pull/1508) by [@groue](https://github.com/groue): Fix ValueObservation mishandling of database schema modification
- **Fixed**: [#1512](https://github.com/groue/GRDB.swift/issues/1512): Decoding errors are now correctly reported when decoding NULL into a non-optional property of type `Data` or `Date`.

## 6.25.0

Released February 25, 2024

- **New**: [#1496](https://github.com/groue/GRDB.swift/pull/1496) by [@danielepantaleone](https://github.com/danielepantaleone): Add privacy manifest file.

    A `PrivacyInfo.xcprivacy` resource was added to the GRDB SPM package and Xcode projects. It declares that GRDB does not collect anything. 

## 6.24.2

Released January 21, 2024

- **Documentation Update**: [#1485](https://github.com/groue/GRDB.swift/pull/1485) The [Sharing a Database](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/databasesharing) guide was updated with a new recommendation for databases shared between multiple processes. Writers should always perform IMMEDIATE transactions in order to avoid the `SQLITE_BUSY` error that can occur when transactions overlap. The new recommendation fits in a single line of code: `configuration.defaultTransactionKind = .immediate`.
- **New**: Associations that involve views instead of tables were already supported, with an explicit `ForeignKey` in their definition. When the foreign key is missing, a clear diagnostic message is now emitted, instead of an unhelpful "no such table" runtime error.

## 6.24.1

Released January 6, 2024

- **New**: [#1477](https://github.com/groue/GRDB.swift/pull/1477): Remove shadow tables from database dump

## 6.24.0

Released January 6, 2024

- **New**: [#1466](https://github.com/groue/GRDB.swift/pull/1466) by [@barnettben](https://github.com/barnettben): Add schema name option to database introspection methods

## 6.23.0

Released December 1, 2023

- **New**: [#1462](https://github.com/groue/GRDB.swift/pull/1462) Temporary read-only access

## 6.22.0

Released November 26, 2023

- **New**: [#1452](https://github.com/groue/GRDB.swift/pull/1452) by [@groue](https://github.com/groue): SQLite 3.44.0, FILTER and ORDER BY clauses in aggregate functions
- **New**: [#1460](https://github.com/groue/GRDB.swift/pull/1460) by [@groue](https://github.com/groue): Explicit change notifications help applications deal with undetected database changes.
- **Documentation Update**: The documentations of [`ValueObservation`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/valueobservation), [`DatabaseRegionObservation`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/databaseregionobservation), and [`TransactionObserver`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/transactionobserver) have a new "Dealing with Undetected Changes" that documents possible strategies for notifying applications of undetected database changes.  

## 6.21.0

Released October 29, 2023

- **New**: [#1448](https://github.com/groue/GRDB.swift/pull/1448) by [@groue](https://github.com/groue): Add support for stable ordering and dump of views
- **New**: [#1449](https://github.com/groue/GRDB.swift/pull/1449) by [@groue](https://github.com/groue): Backport temporary copies from GRDBSnapshotTesting

## 6.20.2

Released October 15, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.20.1...v6.20.2)

- **Fixed**: [#1442](https://github.com/groue/GRDB.swift/pull/1442) by [@groue](https://github.com/groue): Extend the macOS availability of JSON functions

## 6.20.1

Released October 13, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.20.0...v6.20.1)

- **Fixed**: Removed a debug print

## 6.20.0

Released October 13, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.19.0...v6.20.0)

- **New**: [#1439](https://github.com/groue/GRDB.swift/pull/1439) by [@groue](https://github.com/groue): Dump requests
- **New**: `QueryInterfaceRequest.withStableOrder()` returns a request with well-defined order, suitable for tests. 

## 6.19.0

Released October 4, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.18.0...v6.19.0)

- **New**: [#1429](https://github.com/groue/GRDB.swift/pull/1429) by [@JhonnyBillM](https://github.com/JhonnyBillM): Allow `DatabaseValueConvertible` types to customize their database JSON format
- **New**: [#1436](https://github.com/groue/GRDB.swift/pull/1436) by [@myyra](https://github.com/myyra) and [@groue](https://github.com/groue): JSON functions
- **New**: `Database` has learned to create indexes on expressions, and specify specific collations on indexed columns, with the `create(index:on:expressions:options:condition:)` method. 
- **New**: Codable records can specify coding strategies for their `Data` properties. See [#1436](https://github.com/groue/GRDB.swift/pull/1436) for more information.
- **Documentation Update**: A new [JSON Support](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/json) article provides an overview of JSON handling.
- **Documentation Update**: The [Recommended Practices for Designing Record Types](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/recordrecommendedpractices) now recommend that record types with an auto-incremented id avoid conforming to the `Identifiable` protocol.

## 6.18.0

Released September 1, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.17.0...v6.18.0)

- **New**: Expose the database path from `DatabaseReader`.

## 6.17.0

Released August 26, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.16.0...v6.17.0)

- **New**: [#1421](https://github.com/groue/GRDB.swift/pull/1421) by [@groue](https://github.com/groue): Make it possible to open a DatabaseQueue in the WAL mode

## 6.16.0

Released July 9, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.15.1...v6.16.0)

- **New**: [#1397](https://github.com/groue/GRDB.swift/pull/1397) by [@groue](https://github.com/groue): Swift API for creating database views
- **New**: [#1401](https://github.com/groue/GRDB.swift/pull/1401) by [@kustra](https://github.com/kustra): Linux compilation fixes
- **New**: [#1402](https://github.com/groue/GRDB.swift/pull/1402) by [@groue](https://github.com/groue): Upgrade custom SQLite builds to 3.42.0
- **New**: [#1403](https://github.com/groue/GRDB.swift/pull/1403) by [@groue](https://github.com/groue): GitHub CI: test Xcode 14.3.1, macOS 13
- **New**: :star: [#1405](https://github.com/groue/GRDB.swift/pull/1405) Simplify the declaration of BelongsTo associations in the database schema
- **Documentation Update**: The documentation was updated for the new recommended way to declare associations in the database schema, with the `belongsTo()` method introduced by [#1405](https://github.com/groue/GRDB.swift/pull/1405):
    - [`belongsTo(_:inTable:onDelete:onUpdate:deferred:indexed:)`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/tabledefinition/belongsto(_:intable:ondelete:onupdate:deferred:indexed:))
    - [The Database Schema](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/databaseschema)
    - [Migrations](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/migrations)
    - [Recommended Practices for Designing Record Types](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/recordrecommendedpractices)
    - [Associations](Documentation/AssociationsBasics.md)
    - [`BelongsToAssociation`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/belongstoassociation)
    - [`HasManyAssociation`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/hasmanyassociation)
    - [`HasOneAssociation`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/hasoneassociation)


## 6.15.1

Released June 17, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.15.0...v6.15.1)

- **Fixed**: Fixed Xcode 15 warnings
- **Fixed**: [#1391](https://github.com/groue/GRDB.swift/pull/1391) Fix upsert in FTS5-synchronized tables


## 6.15.0

Released June 2, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.14.0...v6.15.0)

- **New**: [#1382](https://github.com/groue/GRDB.swift/pull/1382) Add `DerivableRequest.all()`
- **New**: [#1384](https://github.com/groue/GRDB.swift/pull/1384) Allow ValueObservation to start from a truncated wal file
- **Documentation Update**: The [ValueObservation Performance](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/valueobservation#ValueObservation-Performance) documentation chapter explains how truncating WAL checkpoints impact `ValueObservation`.


## 6.14.0

Released May 25, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.13.0...v6.14.0)

- **New**: [#1376](https://github.com/groue/GRDB.swift/pull/1376) Bitwise operations
- **New**: [#1379](https://github.com/groue/GRDB.swift/pull/1379) Create indexes with a default name


## 6.13.0

Released May 15, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.12.0...v6.13.0)

- **New**: [#1373](https://github.com/groue/GRDB.swift/pull/1373) Deprecate string literal arguments for `TableDefinition.check()`


## 6.12.0

Released April 29, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.11.0...v6.12.0)

- **Fixed**: [#1364](https://github.com/groue/GRDB.swift/pull/1364) Fix a regression introduced with version 6.10.0, where starting multiple observations while performing writes could create a deadlock.
- **New**: `FetchableRecordDecoder` is an object that decodes `Decodable` fetchable records from database rows. You may want to use this decoder when you want to use the `Decodable` initializer from `init(row: Row)`.

## 6.11.0

Released April 17, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.10.2...v6.11.0)

- **New**: [#1361](https://github.com/groue/GRDB.swift/pull/1361) `DatabaseMigrator.eraseDatabaseOnSchemaChange` ignores internal schema objects

## 6.10.2

Released April 10, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.10.1...v6.10.2)

- **Documentation Update**: The [Recommended Practices for Designing Record Types](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/recordrecommendedpractices) guide has moved to DocC.
- **Documentation Update**: The [Demo Applications](Documentation/DemoApps/) demonstrate how their `AppDatabase` "database manager" can provide a base database configuration. 

## 6.10.1

Released April 1, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.10.0...v6.10.1)

- **Fixed**: [#1357](https://github.com/groue/GRDB.swift/pull/1357) `QueryInterfaceRequest.fetchCount` no longer executes invalid SQL queries for some requests.

## 6.10.0

Released March 20, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.9.2...v6.10.0)

- **New**: [#1350](https://github.com/groue/GRDB.swift/pull/1350) by [@groue](https://github.com/groue): DatabasePool won't close read-only connections if requested, and ValueObservation no longer opens a new database connection when it starts.

## 6.9.2

Released March 14, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.9.1...v6.9.2)

- **Fixed**: [#1349](https://github.com/groue/GRDB.swift/pull/1349) by [@JonLz](https://github.com/JonLz): Fix Migrations.md example so it compiles
- **Fixed**: Avoid the risk for pathologically deep stack trace, or stack overflow, introduced by [#1348](https://github.com/groue/GRDB.swift/pull/1348).

## 6.9.1

Released March 12, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.9.0...v6.9.1)

- **Documentation Updates**: Moved more README chapters into DocC:
    - [`RowAdapter`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/rowadapter)
    - [`splittingRowAdapters(columnCounts:)`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/splittingrowadapters(columncounts:))

## 6.9.0

Released March 12, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.8.0...v6.9.0)

- **New**: [#1348](https://github.com/groue/GRDB.swift/pull/1348) by [@groue](https://github.com/groue): SQLite argument binding optimization
- **New**: `FTS5.api(db)` returns a pointer to the `fts5_api` structure, useful for low-level [FTS5 customization](https://www.sqlite.org/fts5.html#extending_fts5).
- **Documentation Updates**: Moved more README chapters into DocC, enhanced and extended DocC articles:
    - [Database Connections](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/databaseconnections)
    - [Prepared Statements](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/statement)
    - [DatabaseValueConvertible](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/databasevalueconvertible)

## 6.8.0

Released February 24, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.7.0...v6.8.0)

- **New**: [#1338](https://github.com/groue/GRDB.swift/pull/1338) by [@groue](https://github.com/groue): TimestampedRecord sample code
- **New**: `EncodableRecord.databaseChanges(modify:)` modifies a record and returns a dictionary of applied changes.
- **Documentation Update**: The [Record Timestamps and Transaction Date](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/recordtimestamps) article provides a sample `TimestampedRecord` protocol that application may adapt for their own use.

## 6.7.0

Released February 19, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.6.1...v6.7.0)

- **Fixed**: [#1316](https://github.com/groue/GRDB.swift/pull/1316) and [#1320](https://github.com/groue/GRDB.swift/pull/1320) by [@baekteun](https://github.com/baekteun): Replace "OSX" with "macOS".
- **Fixed**: [#1328](https://github.com/groue/GRDB.swift/pull/1328) by [@ytti](https://github.com/ytti): Fix documentation about Data passphrases.
- **Fixed**: [#1327](https://github.com/groue/GRDB.swift/pull/1327) by [@groue](https://github.com/groue): Remove dependency on any specific SwiftLint version.
- **New**: [#1331](https://github.com/groue/GRDB.swift/pull/1331) by [@groue](https://github.com/groue): Transaction Date
- **New**: [#1336](https://github.com/groue/GRDB.swift/pull/1336) by [@groue](https://github.com/groue): Enable FTS5 by default
- **Documentation Update**: The new [Record Timestamps and Transaction Date](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/recordtimestamps) article explains how applications can save the creation and modification date of records.
- Added support for `Table` in SQL interpolation.

## 6.6.1

Released January 15, 2023 • [diff](https://github.com/groue/GRDB.swift/compare/v6.6.0...v6.6.1)

- **Fixed**: [#1317](https://github.com/groue/GRDB.swift/pull/1317) by [@groue](https://github.com/groue): Fix handling of multiple deep prefetched associations

## 6.6.0

Released December 29, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v6.5.0...v6.6.0)

- **New**: [#1304](https://github.com/groue/GRDB.swift/pull/1304) by [@groue](https://github.com/groue): Expose generated columns with availability checks

## 6.5.0

Released December 5, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v6.4.0...v6.5.0)

- **New**: [#1299](https://github.com/groue/GRDB.swift/pull/1299) by [@groue](https://github.com/groue): Record.find() convenience methods

## 6.4.0

Released November 28, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v6.3.1...v6.4.0)

- **New**: [#1293](https://github.com/groue/GRDB.swift/pull/1293) by [@groue](https://github.com/groue): Enable concurrent reads from a WAL snapshot.
- **New**: [#1297](https://github.com/groue/GRDB.swift/pull/1297) by [@groue](https://github.com/groue): SPM: expose the CSQLite product.
- **New**: `DatabaseReader.configuration.readQoS` and `writeQoS` return the effective quality of service of read-only and write database accesses. This helps application code avoid priority inversion and similar scheduling misuses when needed.
- **New**: `DatabaseReader.configuration.maximumReaderCount` returns the effective capacity for concurrent reads, so that application code can adapt when needed.
- **New**: `DatabasePool.makeSnapshot()` no longer throws an error when the database is not in the WAL mode. In such case, the returned snapshot prevents all database modifications during its lifetime.
- **New**: A new [`DatabaseSnapshotReader`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/databasesnapshotreader) protocol was introduced for types that see an unchanging database content (`DatabaseSnapshot` and the new `DatabaseSnapshotPool`).   
- **New**: [`Database.registerAccess(to:)`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/database/registeraccess(to:)) has `ValueObservation` track a region. This helps building optimized observations of a constant database region with [`ValueObservation.trackingConstantRegion(_:)`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/valueobservation/trackingconstantregion(_:)).
- **New**: Open several connections to the same in-memory database with [`DatabaseQueue(named:)`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/databasequeue/init(named:configuration:)).
- **New**: [`TableDefinition`](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/tabledefinition) has new methods for defining primary keys, with automatic NOT NULL constraints. They workaround [an SQLite bug](https://www.sqlite.org/quirks.html#primary_keys_can_sometimes_contain_nulls). Previous techniques for defining primary keys are preserved for backwards compatibility, but their use is not recommended.
- **New**: The [Database Schema](https://swiftpackageindex.com/groue/GRDB.swift/documentation/grdb/databaseschema) documentation article has a brand new "Database Schema Recommendations" section.
- **New**: Multiple improvements to the DocC documentation.

## 6.3.1

Released November 11, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v6.3.0...v6.3.1)

- **New**: DocC documentation is hosted at https://swiftpackageindex.com/groue/GRDB.swift/documentation

## 6.3.0

Released November 6, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v6.2.0...v6.3.0)

- **New**: [#1291](https://github.com/groue/GRDB.swift/pull/1291) by [@groue](https://github.com/groue): DocC inline documentation
- **New**: The `Row.dataNoCopy` methods are deprecated. Use `Row.withUnsafeData` instead.

## 6.2.0

Released October 28, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v6.1.0...v6.2.0)

- **New**: [#1289](https://github.com/groue/GRDB.swift/pull/1289) by [@arkie](https://github.com/arkie): Add support for passing in categories to the FTS5 unicode61 tokenizer (SQLite 3.25+)
- **Fixed**: The `FTS5Tokenizer.tokenize(query:)` method no longer returns incorrect results for certain tokenizer arguments.

## 6.1.0

Released October 20, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v6.0.0...v6.1.0)

- **New**: [#1288](https://github.com/groue/GRDB.swift/pull/1288) by [@jcavar](https://github.com/jcavar): Support for strict tables

## 6.0.0

Released September 9, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v6.0.0-beta.4...v6.0.0)

- **New**: Bump custom SQLite builds v3.39.3
- **Fixed**: [#1274](https://github.com/groue/GRDB.swift/discussions/1274) Fixed a bug with HasManyThrough associations when the "through" association has the same association key as the association itself.
- **Fixed**: [#1275](https://github.com/groue/GRDB.swift/issues/1275) Enhance error message for some requests involving associations on common table expressions.
- **Fixed**: [#1276](https://github.com/groue/GRDB.swift/issues/1276) Fix build error with Xcode 14.0 RC (14A309)
- **Breaking Change**: Request methods that accept a closure with a `Database` argument have been renamed with the `WhenConnected` suffix: `request.filterWhenConnected { db in ... }`, etc. 

## 6.0.0-beta.4

Released August 28, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v6.0.0-beta.3...v6.0.0-beta.4)

- **New**: [#1271](https://github.com/groue/GRDB.swift/pull/1271) by [@groue](https://github.com/groue): Bump custom SQLite builds v3.39.2
- **New**: [SQLITE_OPEN_EXRESCODE](https://www.sqlite.org/c3ref/open.html), when available, exposes [extended result codes](README.md#databaseerror) when opening a database connection.
- **Fixed**: [PRAGMA table_list](https://www.sqlite.org/pragma.html#pragma_table_list), when available, makes it possible for GRDB to detect [WITHOUT ROWID](https://www.sqlite.org/withoutrowid.html) tables without [polluting the SQLite error log](https://github.com/groue/GRDB.swift/issues/945).
- **Breaking Change**: The`GRDB.xcodeproj` or `GRDBCustom.xcodeproj` projects now define cross-platforms targets.
- **Documentation Update**: [Migrating From GRDB 5 to GRDB 6](Documentation/GRDB6MigrationGuide.md) describes how to update applications that directly embed the `GRDB.xcodeproj` or `GRDBCustom.xcodeproj` project.
- **Documentation Update**: [Custom SQLite Builds](CustomSQLiteBuilds.md) was updated for the new cross-platform target defined by the `GRDBCustom.xcodeproj` project.

## 6.0.0-beta.3

Released August 25, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v6.0.0-beta.2...v6.0.0-beta.3)

- **Fix**: [#1268](https://github.com/groue/GRDB.swift/pull/1268) by [@groue](https://github.com/groue): Fix SQL generation of CHECK constraints
- **Breaking Change**: The `Column` type is no longer `Equatable`
- **Documentation Update**: [Migrating From GRDB 5 to GRDB 6](Documentation/GRDB6MigrationGuide.md) describes in detail how to update records that customize their persistence methods.
- **Documentation Update**: The [Single-Row Tables](Documentation/SingleRowTables.md) guide was updated for the new persistence callbacks.

## 6.0.0-beta.2

Released August 23, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v6.0.0-beta...v6.0.0-beta.2)

- **New**: Extended UPSERT apis with the ability to define the conflict target, and the assignments performed in case of conflicts.
- **Documentation Update**: A new [Upsert](README.md#upsert) chapter describes upserts in detail.

## 6.0.0-beta

Released August 21, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.26.0...v6.0.0-beta)

### New

Upgrading your app can bring improvements: check [Migrating From GRDB 5 to GRDB 6](Documentation/GRDB6MigrationGuide.md) for some suggestions.

- :star: Support for [`UPSERT`](https://www.sqlite.org/lang_UPSERT.html): `player.upsert(db)`, etc. See [Persistence Methods](README.md#persistence-methods).

- :star: Support for the [`RETURNING` clause](https://www.sqlite.org/lang_returning.html): `player.insertAndFetch(db)`, `Player.deleteAndFetchAll(db)`, etc. See [Persistence Methods and the `RETURNING` clause](README.md#persistence-methods-and-the-returning-clause).

- :star: [Persistence Callbacks](README.md#persistence-callbacks) allow record types to customize persistence methods: `didInsert`, `willSave`, etc.

- :star: Better support for unexpected database values. Where GRDB 5 would crash during encoding and decoding database values, GRDB 6 has learned to throw errors instead. Record protocols throw decoding and encoding errors, and value requests throw errors on invalid inputs.

- Request protocols and cursors now define primary associated types, enabled by [SE-0346](https://github.com/apple/swift-evolution/blob/main/proposals/0346-light-weight-same-type-syntax.md).

- All persistence methods now accept an explicit conflict policy: `player.insert(db, onConflict: .replace)`, etc.

- You can append the contents of a cursor to a collection with `RangeReplaceableCollection.append(contentsOf:)`.

- `ValueObservation.map` now accepts a throwing closure argument.

### Documentation Updates

- :star: **[Migrating From GRDB 5 to GRDB 6](Documentation/GRDB6MigrationGuide.md)**: suggestions for improving your applications, and guidance for handling the breaking changes.
- The [Persistence Methods](README.md#persistence-methods) chapter introduces the `upsert` method.
- The [Persistence Methods and the `RETURNING` clause](README.md#persistence-methods-and-the-returning-clause) chapter introduces persistence methods that fetch inserted, updated and deleted values.
- The [Persistence Callbacks](README.md#persistence-callbacks) chapter introduces the callback invoked from persistence methods, such as `didInsert`, `willSave`, etc.
- The [DatabaseRegionObservation](README.md#databaseregionobservation) chapter was updated for the new `DatabaseRegionObservation.start` method.
- The [Transaction Hook](README.md#transaction-hook) chapter describes the new `Database.afterNextTransaction(onCommit:onRollback:)` method.
- The [Value Queries](README.md#value-queries) chapter explains how to distinguish a request that returns no value from a request that fetches a NULL value.

### Breaking Changes

- Removed deprecated methods
- :star: Bumped requirements:
    - Swift 5.7+ and Xcode 14+ are required.
    - iOS 11.0+ / macOS 10.13+ / tvOS 11.0+ / watchOS 4.0+ / SQLite 3.19.3+ are required.
- :star: Record protocols were refactored:
    - The `FetchableRecord.init(row:)` initializer can now throw errors.
    - The `EncodableRecord.encode(to:)` method can now throw errors.
    - Record types can no longer override persistence methods. You use [Persistence Callbacks](README.md#persistence-callbacks) instead.
- Various breaking changes:
    - The in-memory `DatabaseQueue()` initializer can now throw errors.
    - The `selectID()` method is replaced with `selectPrimaryKey(as:)`.
    - `Cursor.isEmpty` is now a throwing property, instead of a method.
    - The `Record.copy()` method was removed, without replacement.
    - The `DerivableRequest.limit(_:offset_:)` method was removed, without replacement.
    - `DatabaseRegionObservation.start(in:onError:onChange:)` now returns a cancellable.
    - The `DatabaseRegionObservation.extent` property was removed.
    - The `statement` property of database cursors was replaced with read-only properties such as `sql` or `columnNames`.
    - The `Database.afterNextTransactionCommit(_:)` method was renamed `Database.afterNextTransaction(onCommit:onRollback:)`, and is now able to report rollbacks as well as commits.

## 5.26.1

Released September 8, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.26.0...v5.26.1)

- **Fixed**: [#1276](https://github.com/groue/GRDB.swift/issues/1276) Fix build error with Xcode 14.0 RC (14A309)

## 5.26.0

Released July 9, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.25.0...v5.26.0)

- **New**: [#1248](https://github.com/groue/GRDB.swift/pull/1248) by [@groue](https://github.com/groue): Avoid double notification of the initial value for ValueObservation on DatabasePool
- **New**: [#1253](https://github.com/groue/GRDB.swift/pull/1253) by [@george-signal](https://github.com/george-signal): Make memory management optional
- **Fixed**: DatabasePool no longer prevents database reads when UIKit posts `UIApplication.didReceiveMemoryWarningNotification` (see [#1253](https://github.com/groue/GRDB.swift/pull/1253) for more information).

## 5.25.0

Released June 11, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.24.1...v5.25.0)

- **New**: [#1226](https://github.com/groue/GRDB.swift/pull/1226) by [@naveensrinivasan](https://github.com/naveensrinivasan): Included githubactions in the dependabot config
- **New**: [#1228](https://github.com/groue/GRDB.swift/pull/1228) by [@naveensrinivasan](https://github.com/naveensrinivasan): Set permissions for GitHub actions
- **New**: [#1235](https://github.com/groue/GRDB.swift/pull/1235) by [@groue](https://github.com/groue): Raise default Quality of Service to `.userInitiated`.
- **Fixed**: [#1233](https://github.com/groue/GRDB.swift/pull/1233) by [@GetToSet](https://github.com/GetToSet): Fix warnings of redundant conformance constraint on Xcode 14.

## 5.24.1

Released May 26, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.24.0...v5.24.1)

- **Fixed**: [#1217](https://github.com/groue/GRDB.swift/pull/1217) by [@GetToSet](https://github.com/GetToSet): Fix doc issue on TableRequest.filter(keys:).
- **Fixed**: [#1225](https://github.com/groue/GRDB.swift/pull/1225) by [@groue](https://github.com/groue): Prevent heavy DatabasePool concurrent reads from creating too many threads

## 5.24.0

Released May 1, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.23.0...v5.24.0)

- **Fixed**: [#1203](https://github.com/groue/GRDB.swift/pull/1203) by [@EvanHahn](https://github.com/EvanHahn): Fix changelog links
- **Fixed**: [#1212](https://github.com/groue/GRDB.swift/pull/1212) by [@MartinP7r](https://github.com/MartinP7r): Fix apple docs links
- **Fixed**: [#1213](https://github.com/groue/GRDB.swift/pull/1213) by [@groue](https://github.com/groue): Fix crash when the number of active ValueObservations is high
- **Breaking Change**: Transactions performed during a read-only database access are no longer notified to transaction observers. This is, strictly speaking, a breaking change. However it should have no impact since read-only transactions have very little interest.

## 5.23.0

Released April 16, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.22.2...v5.23.0)

- **Breaking Change**: [#1200](https://github.com/groue/GRDB.swift/pull/1200) by [@groue](https://github.com/groue): Require Swift 5.6 Compiler for experimental Concurrency Support

## 5.22.2

Released April 2, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.22.1...v5.22.2)

- **Fixed** a 5.22.0 regression: [#1196](https://github.com/groue/GRDB.swift/pull/1196) by [@layoutSubviews](https://github.com/layoutSubviews): Fix a crash when an observation is quickly cancelled

## 5.22.1

Released March 26, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.22.0...v5.22.1)

- **Fixed** a 5.22.0 regression: [#1194](https://github.com/groue/GRDB.swift/issues/1194) ValueObservation could deadlock when the database is configured with a serial target DispatchQueue.

## 5.22.0

Released March 22, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.21.0...v5.22.0)

- **New**: [#1186](https://github.com/groue/GRDB.swift/pull/1186) by [@benrb](https://github.com/benrb): DatabaseError provide error message as localizedFailureReason
- **Breaking Change**: [#1183](https://github.com/groue/GRDB.swift/pull/1183) by [@groue](https://github.com/groue): Starting a ValueObservation keeps a strong reference on the database connection.

## 5.21.0

Released February 6, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.20.0...v5.21.0)

- **New**: [#1165](https://github.com/groue/GRDB.swift/pull/1165) by [@guidedways](https://github.com/guidedways): Support dynamic linking via Swift Package Manager
- **Breaking Change**: [#1164](https://github.com/groue/GRDB.swift/pull/1164) by [@groue](https://github.com/groue): Drop experimental async apis from DatabaseMigrator


## 5.20.0

Released February 1, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.19.0...v5.20.0)

- **Fixed**: Fixed a bug of `including(all:)` for composite foreign keys and limited requests.
- **Fixed**: [#1162](https://github.com/groue/GRDB.swift/pull/1162) by [@groue](https://github.com/groue): Fix truncate optimization handling.
- **New**: [#1160](https://github.com/groue/GRDB.swift/pull/1160) by [@groue](https://github.com/groue): Hide statement arguments by default.
- **New**: [#1161](https://github.com/groue/GRDB.swift/pull/1161) by [@groue](https://github.com/groue): Target DispatchQueue for non-read-only database connections.
- **Documentation Update**: The [Database Configuration](README.md#database-configuration) chapter explains how to opt in for public statement arguments in DEBUG builds.


## 5.19.0

Released January 19, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.18.0...v5.19.0)

- **New**: [#1144](https://github.com/groue/GRDB.swift/pull/1144) by [@TimAEllis](https://github.com/TimAEllis): Add drop column support
- **Fixed**: [#1139](https://github.com/groue/GRDB.swift/pull/1139) by [@groue](https://github.com/groue): Deal with authorization callbacks from more cursors
- **Fixed**: [#1149](https://github.com/groue/GRDB.swift/pull/1149) by [@BB9z](https://github.com/BB9z): Fix typos


## 5.18.0

Released January 9, 2022 • [diff](https://github.com/groue/GRDB.swift/compare/v5.17.0...v5.18.0)

- **New**: [#1075](https://github.com/groue/GRDB.swift/pull/1075) by [@mallman](https://github.com/mallman): Progress-reporting database backups
- **New**: [#1129](https://github.com/groue/GRDB.swift/pull/1129) by [@groue](https://github.com/groue): Detached columns
- **New**: [#1132](https://github.com/groue/GRDB.swift/pull/1132) by [@groue](https://github.com/groue): Bump custom SQLite builds v3.37.2
- **New**: [#1133](https://github.com/groue/GRDB.swift/pull/1133) by [@groue](https://github.com/groue): Support for STRICT tables
- **Fixed**: [#1120](https://github.com/groue/GRDB.swift/pull/1120) by [@jnross](https://github.com/jnross): Fix typos
- **Fixed**: [#1121](https://github.com/groue/GRDB.swift/pull/1121) by [@byohay](https://github.com/byohay): Quote PROJECT_DIR and SRCROOT environment variables
- **Fixed**: [#1128](https://github.com/groue/GRDB.swift/pull/1128) by [@groue](https://github.com/groue): Deal with authorization callbacks from cursors of FetchableRecord
- **Documentation Update**: A new [Embedding SQL in Query Interface Requests](README.md#embedding-sql-in-query-interface-requests) chapter describes the ways to leverage your SQL skills and extend GRDB apis.


## 5.17.0

Released December 14, 2021 • [diff](https://github.com/groue/GRDB.swift/compare/v5.16.0...v5.17.0)

- **New**: :star: [#1079](https://github.com/groue/GRDB.swift/pull/1079) by [@groue](https://github.com/groue): Async / Await
- **New**: `DatabaseRegion(table: tableName)` is deprecated. Use `Table(tableName)` instead.
- **New**: The `ABS` and `LENGTH` SQL functions are now available on association aggregates, through `abs(aggregate)` and `length(aggregate)`.
- **New**: Support for the [`TOTAL` aggregate function](https://www.sqlite.org/lang_aggfunc.html#sumunc). You can use `total` in Swift, at all places `sum` is available.
- **New**: `ValueObservation.removeDuplicates(by:)` with a closure argument.
- **New**: Testing for the existence of an associated record with `TableAlias.exists` now supports associated views, and associated tables WITHOUT ROWID that have a compound primary key.
- **Fixed**: `Database.primaryKey(_:)` throws when given the name of a view.
- **Documentation Update**: :star: The [Concurrency Guide](Documentation/Concurrency.md) was updated for the new support for asynchronous Swift.
- **Documentation Update**: :star: [GRDBAsyncDemo](Documentation/DemoApps/GRDBAsyncDemo/README.md) is a new SwiftUI demo app that uses the new async apis.
- **Documentation Update**: A new FAQ gives hints for avoiding a [Mutation of captured var in concurrently-executing code](README.md##mutation-of-captured-var-in-concurrently-executing-code) compiler error.
- **Documentation Update**: [#1107](https://github.com/groue/GRDB.swift/pull/1107) by [@tcwalther](https://github.com/tcwalther): Fix docstring for Database.create(index: ...)
- **Documentation Update**: [#1110](https://github.com/groue/GRDB.swift/pull/1110) by [@maxhumber](https://github.com/maxhumber): Minor changes to a tip in the README

## 5.16.0

Released December 5, 2021 • [diff](https://github.com/groue/GRDB.swift/compare/v5.15.0...v5.16.0)

- **New**: [#1106](https://github.com/groue/GRDB.swift/pull/1106) by [@groue](https://github.com/groue): Sugar for fetching only a few columns of associated records
- **Documentation Update**: The [Joining And Prefetching Associated Records](Documentation/AssociationsBasics.md#joining-and-prefetching-associated-records) chapter was fully rewritten. The joining methods `including(required:)` and others are much more detailed, with an exploration of frequent use cases.
- **Documentation Update**: The [Joining And Prefetching Associated Records](Documentation/AssociationsBasics.md#joining-and-prefetching-associated-records) chapter introduces the new `annotated(withRequired:)` and `annotated(withOptional:)` joining methods.
- **Documentation Update**: The new [Choosing a Joining Method Given the Shape of the Decoded Type](Documentation/AssociationsBasics.md#choosing-a-joining-method-given-the-shape-of-the-decoded-type) chapter helps choosing a joining method, given the shape of the fetched data.

## 5.15.0

Released December 2, 2021 • [diff](https://github.com/groue/GRDB.swift/compare/v5.14.0...v5.15.0)

- **Fixed**: `ValueObservation` now always fetches fresh values in an isolated fashion. This prevents all risks of fetching inconsistent data even if an external connection modifies the database.
- **New**: `Table` now conforms to `DatabaseRegionConvertible`. You can write `DatabaseRegionObservation(tracking: Table("player"))`.
- **New**: [#1102](https://github.com/groue/GRDB.swift/pull/1102) by [@groue](https://github.com/groue): Explicit tracked region for ValueObservation

## 5.14.0

Released November 25, 2021 • [diff](https://github.com/groue/GRDB.swift/compare/v5.13.0...v5.14.0)

- **Fix**: `ForeignKeyViolation.failureDescription(_:)` now accepts table names that require quoting.
- **Fix**: Add missing `public` qualifier on `ForeignKeyViolation` properties.
- **New**: `ForeignKeyViolation.databaseError(_:)` turns a foreign key violation into a `DatabaseError`.
- **Documentation Update**: the demo apps were modernized for iOS 15+. The SwiftUI demo app now uses the [GRDBQuery](https://github.com/groue/GRDBQuery) package in order to update its views according to the database content.

## 5.13.0

Released November 7, 2021 • [diff](https://github.com/groue/GRDB.swift/compare/v5.12.0...v5.13.0)

- **Breaking Change**: [#1076](https://github.com/groue/GRDB.swift/pull/1076) by [@groue](https://github.com/groue): Require Swift 5.3 and Xcode 12
- **New**: :star: [#1088](https://github.com/groue/GRDB.swift/pull/1088) by [@groue](https://github.com/groue): Shared ValueObservation
- **New**: :star: [#1095](https://github.com/groue/GRDB.swift/pull/1095) by [@groue](https://github.com/groue): Precise foreign key checks for migrations
- **New**: [#1078](https://github.com/groue/GRDB.swift/pull/1078) by [@groue](https://github.com/groue): Non-mutating persistence methods `saved` and `inserted`, and existence-checking methods `isEmpty` and `exists`
- **New**: `DatabasePool.erase()` prevents concurrent reads until it has completed.
- **New**: The `close()` method allows precise closing of database connections.
- **New**: Filtering records by single-column primary key now properly encodes dates and uuids according to the customized strategies (`filter(id:)`, `deleteAll(_:keys:)`, etc.)
- **New**: `DatabaseUUIDEncodingStrategy.lowercaseString` can encode UUID as a lowercased string. For clarity, the `string` strategy has been deprecated and renamed `uppercaseString`.
- **Documentation Update**: :star: The [Concurrency Guide](Documentation/Concurrency.md) got a major overhaul.
- **Documentation Update**: :star: A new [ValueObservation Sharing](README.md#valueobservation-sharing) chapter describes how to share database observations and spare database resources.
- **Documentation Update**: :star: The [Migrations](Documentation/Migrations.md) guide tells how you can mitigate slow foreign key checks during schema changes.
- **Documentation Update**: The [Date and UUID Coding Strategies](README.md#date-and-uuid-coding-strategies) chapter describes the new support for date and uuid primary key coding in requests by single-column primary key.
- **Documentation Update**: A new [Testing for Record Existence](README.md#testing-for-record-existence) chapter describes the new `request.isEmpty(_:)`, `Record.exists(_:id:)` and `Record.exists(_:key:)` methods.

## 5.12.0

Released September 25, 2021 • [diff](https://github.com/groue/GRDB.swift/compare/v5.11.0...v5.12.0)

- **Breaking Change**: Minimum iOS version is now iOS 11.0, and 32-bits devices are no longer supported. This fixes issues introduced by Xcode 13 ([#1033](https://github.com/groue/GRDB.swift/issues/1033), [#1059](https://github.com/groue/GRDB.swift/issues/1059)).
- **New**: `FTS3Pattern(matchingAllPrefixesIn:)` and `FTS5Pattern(matchingAllPrefixesIn:)` let you build full-text search patterns suitable for prefix queries.
- **New**: `FTS3.tokenize(_:)` and `FTS5Tokenizer.tokenize(_:)` let you tokenize input strings.
- **Documentation Update**: Full-text search documentation was updated for the new search pattern initializers ([FTS3/4](Documentation/FullTextSearch.md#fts3pattern), [FTS5](Documentation/FullTextSearch.md#fts5pattern)), and tokenization methods ([FTS3/4](Documentation/FullTextSearch.md#fts3-and-fts4-tokenization), [FTS5](Documentation/FullTextSearch.md#fts5-tokenization)).

## 5.11.0

Released September 3, 2021 • [diff](https://github.com/groue/GRDB.swift/compare/v5.10.0...v5.11.0)

- **Fixed**: Version 5.10.0, when embedded as an Xcode project, would enable the FTS5 full-text engine on system versions that do not provide it.
- **New**: [#1046](https://github.com/groue/GRDB.swift/pull/1046) by [@groue](https://github.com/groue): Improve performance of by-index row decoding
- **New**: [#1029](https://github.com/groue/GRDB.swift/pull/1029) by [@sberrevoets](https://github.com/sberrevoets), [@groue](https://github.com/groue): Column coding strategies for Codable records


## 5.10.0

Released August 22, 2021 • [diff](https://github.com/groue/GRDB.swift/compare/v5.9.0...v5.10.0)

- **New**: [#1036](https://github.com/groue/GRDB.swift/pull/1036) by [@groue](https://github.com/groue): Restore minimal CI tests
- **New**: [#1037](https://github.com/groue/GRDB.swift/pull/1037) by [@groue](https://github.com/groue): Support BUILD_LIBRARY_FOR_DISTRIBUTION
- **New**: [#1038](https://github.com/groue/GRDB.swift/pull/1038) by [@GetToSet](https://github.com/GetToSet): Add match operator in ColumnExpression for FTS5
- **New**: With Swift 5.5+, enhance access to `Column.rowID`. Row and PersistenceContainer subscripts now accept `row[.rowID]` and `container[.rowID]` ([SE-0299](https://github.com/apple/swift-evolution/blob/main/proposals/0299-extend-generic-static-member-lookup.md))
- **Documentation Update**: A new [Combine and Data Consistency](Documentation/Combine.md#combine-and-data-consistency) chapter explains how to make sure database publishers do not break important database invariants.


## 5.9.0

Released August 15, 2021 • [diff](https://github.com/groue/GRDB.swift/compare/v5.8.0...v5.9.0)

- **Fixed**: [#980](https://github.com/groue/GRDB.swift/pull/980) by [@jroselightricks](https://github.com/jroselightricks): Fix spelling
- **Fixed**: [#989](https://github.com/groue/GRDB.swift/pull/989) by [@pp5x](https://github.com/pp5x): FTS: add support of ifNotExists in synchronize()
- **Fixed**: [#999](https://github.com/groue/GRDB.swift/issues/999): `request(for: association)` no longer crashes when the foreign key contains a NULL value.
- **Fixed**: [#1025](https://github.com/groue/GRDB.swift/issues/1025) by [@mattgallagher](https://github.com/mattgallagher): Fix ValueObservation crash
- **Fixed**: Fix thread unsafety in `ValueObservation.print()`
- **New**: The `selectID()` method is now available for [Identifiable Records](README.md#identifiable-records)
- **New**: Cached prepared statements can profit from [SQL Interpolation](Documentation/SQLInterpolation.md):
    
    ```swift
    let updateStatement = try db.cachedStatement(literal: "INSERT ...")
    //                                           ~~~~~~~
    ```

- **New**: [#993](https://github.com/groue/GRDB.swift/pull/993) by [@groue](https://github.com/groue): QueryInterfaceRequest builder with dynamic table/view name
- **New**: Types that adopt both `DatabaseValueConvertible` and `Codable` now profit from automatic JSON encoding and decoding.
- **New**: [#1010](https://github.com/groue/GRDB.swift/pull/1010) by [@tternes](https://github.com/tternes): Add VACUUM INTO Support
- **New**: [#1012](https://github.com/groue/GRDB.swift/pull/1012) by [@ZevEisenberg](https://github.com/ZevEisenberg): Add brackets to urls in doc comments to make them clickable
- **New**: [#1019](https://github.com/groue/GRDB.swift/pull/1019) by [@groue](https://github.com/groue): Merge prepared statement types, and introduce statement cursor
- **Documentation Update**: The [Requests](README.md#requests) chapter was updated for the new `Table` type that can build requests without any record type.
- **Documentation Update**: The [Custom Value Types](README.md#custom-value-types) chapter was extended about the new support for codable value types encoded as JSON arrays or objects.
- **Documentation Update**: The [Fetching Methods](README.md#fetching-methods) and [Prepared Statements](README.md#prepared-statements) chapters have been updated for the unique `Statement` class, and the new `Database.allStatements()` method.


## 5.8.0

Released May 16, 2021 • [diff](https://github.com/groue/GRDB.swift/compare/v5.7.4...v5.8.0)

- **New**: Support for the `ESCAPE` clause with the `LIKE` operator.
- **New**: You can now define an `SQLRequest` without any generic qualifier (which defaults to `Row`):

    ```swift
    let request = SQLRequest("SELECT ...")
    ```
- **New**: [#967](https://github.com/groue/GRDB.swift/pull/967) by [@steipete](https://github.com/steipete): Make SelectStatement conform to CustomStringConvertible
- **Fixed**: The `DerivableRequest.limit(_:offset:)` method was ill-designed, and removed from the documentation. It is unfortunately impossible to deprecate it without triggering warnings on the legit use cases (on `QueryInterfaceRequest`).
- **Fixed**: [#973](https://github.com/groue/GRDB.swift/pull/973): Restore access to attached databases from record types
- **Fixed**: [#974](https://github.com/groue/GRDB.swift/pull/974): Provide access to included associations when root table is not selected
- **Documentation Update**: A new [Query Interface Organization](Documentation/QueryInterfaceOrganization.md) document reveals the relationship between the various components of the GRDB query builder.

## 5.7.4

Released April 11, 2021 • [diff](https://github.com/groue/GRDB.swift/compare/v5.7.3...v5.7.4)

- **New**: [#953](https://github.com/groue/GRDB.swift/pull/953): Refactor the SwiftUI demo app
- **Fixed**: [#955](https://github.com/groue/GRDB.swift/pull/955) by [@steipete](https://github.com/steipete): Robustness of @Query in the SwiftUI demo app
- **Fixed**: [#956](https://github.com/groue/GRDB.swift/pull/956): Fix case-sensitivity of region-based database observation
- **New**: [#958](https://github.com/groue/GRDB.swift/pull/958) by [@chrisballinger](https://github.com/chrisballinger): Always add userInfo to databaseJSONDecoder and databaseJSONEncoder
- **New**: [#960](https://github.com/groue/GRDB.swift/pull/960) by [@MartinP7r](https://github.com/MartinP7r): Add tests for userInfo being applied to database encoder/decoder


## 5.7.3

Released April 5, 2021 • [diff](https://github.com/groue/GRDB.swift/compare/v5.7.2...v5.7.3)

- **Fixed**: [#950](https://github.com/groue/GRDB.swift/pull/950) by [@MartinP7r](https://github.com/MartinP7r): Fix memory consumption when encoding JSON columns
- **Fixed**: [#951](https://github.com/groue/GRDB.swift/pull/951) by [@alexwlchan](https://github.com/alexwlchan): Fix documentation typo
- **Fixed**: [#952](https://github.com/groue/GRDB.swift/pull/952) by [@holsety](https://github.com/holsety): Fix documentation typo
- **Documentation Update**: [#953](https://github.com/groue/GRDB.swift/pull/953): Refactor the SwiftUI demo app

#### 5.7.2

- **Fixed**: Really fix breaking change and restore `SQLLiteral` as a deprecated alias for `SQL`.

#### 5.7.1

- **Fixed**: Fix breaking change and restore `SQLLiteral` as a deprecated alias for `SQL`.

## 5.7.0

Released March 28, 2021 • [diff](https://github.com/groue/GRDB.swift/compare/v5.6.0...v5.7.0)

- **New**: [#947](https://github.com/groue/GRDB.swift/pull/947) by [@chrisballinger](https://github.com/chrisballinger): Allow access to Encoder from KeyedEncodingContainer

- **New**: Record types that adopt the standard [Identifiable](https://developer.apple.com/documentation/swift/identifiable) protocol have gained type-safe methods that deal with the primary key. For example:
    
    ```swift
    let player = try Player.fetchOne(db, id: 42)
    try Player.deleteAll(db, ids: [1, 2, 3])
    ```
    
    See the new [Identifiable Records](README.md#identifiable-records) documentation chapter for more information.

- **New**: `SQLLiteral` has more use cases than initialy expected, and is renamed `SQL`.

- **New**: [`SQL` literal](Documentation/SQLInterpolation.md#sql-literal) can now be directly used as an expression, an ordering term, or a selection item.:
    
    ```swift
    let name = "O'Brien"
    let request = Player
        .select(SQL("id, score"), ...)
        .filter(SQL("name = \(name)") && ...)
        .order(SQL("score DESC"), ...)
    ```

- **New**: Table creation DSL now supports columns and constraints defined with raw SQL String or [SQL literal](Documentation/SQLInterpolation.md#sql-literal):
    
    ```swift
    try db.create(table: "player") do { t in
        t.column(sql: "id INTEGER PRIMARY KEY AUTOINCREMENT")
        t.column(literal: "name TEXT DEFAULT \("Anonymous")")
        t.constraint(sql: "CHECK (LENGTH(name) > 0)")
        t.constraint(literal: "CHECK (LENGTH(name) <= \(100))")
    }
    ```

- **New**: Prepared statements can profit from [SQL Interpolation](Documentation/SQLInterpolation.md):
    
    ```swift
    let updateStatement = try db.makeUpdateStatement(literal: "INSERT ...")
    let selectStatement = try db.makeSelectStatement(literal: "SELECT ...")
    //                                               ~~~~~~~
    ```

- **New**: [DatabaseMigrator](Documentation/Migrations.md#asynchronous-migrations) can now asynchronously migrate a database. A Combine publisher is also available.

- **New**: Added support for the `EXISTS` and `NOT EXISTS` subquery operators. See the updated [SQL Operators](README.md#sql-operators) documentation.

- **New**: `Foundation.Decimal` can now be stored in the database, and all Foundation number types can be decoded from decimal numbers stored as strings. See the [NSNumber, NSDecimalNumber, and Decimal](README.md#nsnumber-nsdecimalnumber-and-decimal) chapter for details.

## 5.6.0

Released March 12, 2021 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.5.0...v5.6.0)

- **Fixed**: [#933](https://github.com/groue/GRDB.swift/pull/933): Fix DatabaseMigrator.eraseDatabaseOnSchemaChange in the context of shared databases

- **Fixed**: [#934](https://github.com/groue/GRDB.swift/pull/934): Fix a crash in the ValueObservation publisher

- **New**: [#936](https://github.com/groue/GRDB.swift/pull/936): Complete Associations and the DerivableRequest Protocol

- **New**: Database cursors can feed more standard Swift collections: `Array(cursor, minimumCapacity: ...)`, `Dictionary(uniqueKeysWithValues: cursor)`, etc (see [Cursors](README.md#cursors)).

- **Documentation update**: The [Associations Guide](Documentation/AssociationsBasics.md) has gained a new [Further Refinements to Associations](Documentation/AssociationsBasics.md#further-refinements-to-associations) chapter which shows the new association methods brought by [#936](https://github.com/groue/GRDB.swift/pull/936).

- **Documentation update**: The [Good Practices for Designing Record Types](Documentation/GoodPracticesForDesigningRecordTypes.md) guide has an updated [Define Record Requests](Documentation/GoodPracticesForDesigningRecordTypes.md#define-record-requests) chapter, now that the `DerivableRequest` protocol has access to `limit`, `distinct`, `group`, `having`, association aggregates, and common table expressions.

- **Documentation update**: The [Good Practices for Designing Record Types](Documentation/GoodPracticesForDesigningRecordTypes.md) guide has a new chapter of good practices: [Record Types Hide Intimate Database Details](Documentation/GoodPracticesForDesigningRecordTypes.md#record-types-hide-intimate-database-details).

- **Documentation update**: A new [Single-Row Tables](Documentation/SingleRowTables.md) guide provides guidance for designing tables that store configuration values, user preferences, and generally some global application state.

## 5.5.0

Released March 3, 2021 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.4.0...v5.5.0)

- **New**: You can now define common table expressions without any generic qualifier (which defaults to `Row`):

    ```swift
    let cte = CommonTableExpression(...)
    ```
    
    The [Common Table Expressions Guide](Documentation/CommonTableExpressions.md) was updated accordingly.

- **New**: `DatabaseQueue` reading methods are now wrapped in a deferred transaction. This guarantees snapshot isolation in case of concurrent writes performed by external connections, and makes `DatabaseQueue` a type suitable for shared databases.

- **Fixed**: `DatabaseQueue.read` is now declared `throws` instead of `rethrows`.

- **Fixed**: [#930](https://github.com/groue/GRDB.swift/pull/930): Fix SQL generation for `COLLATE`, `IN`, `NOT IN`

## 5.4.0

Released February 15, 2021 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.3.0...v5.4.0)

- **Breaking Change**: The query interface was refactored and some types such as `SQLExpression` are no longer a protocol.
    
    This may break some applications that rely on Swift type inference, such as in the following example:
    
    ```swift
    // No longer compiles
    let values = [Column("score"), Column("score") + Column("bonus")]
    ```
    
    The fix is to add an explicit declaration of the desired type:
    
    ```swift
    // A possible fix
    let values: [SQLExpressible] = [Column("score"), Column("score") + Column("bonus")]
    ```
    
    Occurrences of such code breakage should be very rare.
    
- **New**: [SQL Interpolation](Documentation/SQLInterpolation.md) supports embedding collations into SQL literals:
    
    ```swift
    let request: SQLRequest<Player> = "SELECT * FROM player ORDER BY email COLLATION \(.nocase)"
    let request: SQLRequest<Player> = "SELECT * FROM player ORDER BY name COLLATION \(.localizedCompare)"
    ```
    
- **Documentation update**: [Adding support for missing SQL functions or operators](README.md#adding-support-for-missing-sql-functions-or-operators) explains how to extend the query interface when needed.

- **Documentation update**: The [Demo Applications](Documentation/DemoApps/) now provide tests for the database access layer.

## 5.3.0

Released January 9, 2021 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.2.0...v5.3.0)

- **New**: [#880](https://github.com/groue/GRDB.swift/pull/880): Common Table Expressions
- **New**: [#892](https://github.com/groue/GRDB.swift/pull/892) by [@eburns-vmware](https://github.com/eburns-vmware): Provide SQLCipher passphrase as Data
- **Fixed**: [#881](https://github.com/groue/GRDB.swift/pull/881) by [@felixscheinost](https://github.com/felixscheinost) and [#883](https://github.com/groue/GRDB.swift/pull/883) by [@professordeng](https://github.com/professordeng): Documentation improvements
- **Fixed**: [#885](https://github.com/groue/GRDB.swift/pull/885): Robustness of eager loading of to-many associations based on compound foreign keys
- **Fixed**: [#901](https://github.com/groue/GRDB.swift/pull/901) by [@wuyuehyang](https://github.com/wuyuehyang): Fix creation of FTS5 tokenizer with arguments
- **Fixed**: [#903](https://github.com/groue/GRDB.swift/pull/903) by [@chrisballinger](https://github.com/chrisballinger): Fix SPM installation instructions
- **Documentation update**: A new guide: [Common Table Expressions](https://github.com/groue/GRDB.swift/blob/master/Documentation/CommonTableExpressions.md)
- **Documentation update**: The [Foreign Keys](https://github.com/groue/GRDB.swift/blob/master/Documentation/AssociationsBasics.md#foreign-keys) chapter of the Associations Guide clarifies the behavior of SQLite and GRDB regarding the presence of NULL if compound foreign keys.


## 5.2.0

Released November 29, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.1.0...v5.2.0)

- **New**: [#868](https://github.com/groue/GRDB.swift/pull/868): ValueObservation optimization is opt-in.
- **New**: [#872](https://github.com/groue/GRDB.swift/pull/872): Parse time zones
- **Documentation update**: The [ValueObservation Performance](https://github.com/groue/GRDB.swift/blob/master/README.md#valueobservation-performance) chapter was extended with a tip for observations that track a constant database region.
- **Documentation update**: The [Date and DateComponents](https://github.com/groue/GRDB.swift/blob/master/README.md#date-and-datecomponents) chapter describes the support for time zones.
- **Documentation update**: A caveat ([#871](https://github.com/groue/GRDB.swift/issues/871)) with the `including(all:)` method, which may fail with a database error of code [`SQLITE_ERROR`](https://www.sqlite.org/rescode.html#error) (1) "Expression tree is too large" when you use a compound foreign key and there are a lot of parent records, is detailed in the [Joining And Prefetching Associated Records](https://github.com/groue/GRDB.swift/blob/master/Documentation/AssociationsBasics.md#joining-and-prefetching-associated-records) chapter.


## 5.1.0

Released November 1, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.3...v5.1.0)

- **New**: Clarifications on [ValueObservation that track a varying database region](https://github.com/groue/GRDB.swift/blob/master/README.md#observing-a-varying-database-region).
- **New**: FAQ [Why is ValueObservation not publishing value changes?](https://github.com/groue/GRDB.swift/blob/master/README.md#why-is-valueobservation-not-publishing-value-changes)
- **New**: [#855](https://github.com/groue/GRDB.swift/pull/855) by [@mallman](https://github.com/mallman): Support for generated columns with custom SQLite build, and upgrade custom SQLite builds to version 3.33.0
- **New**: [#864](https://github.com/groue/GRDB.swift/pull/864): Prevent filter misuse with a deprecation warning


## 5.0.3

Released October 25, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.2...v5.0.3)

- **Fixed**: [#859](https://github.com/groue/GRDB.swift/pull/859): Database.close() is idempotent
- **Fixed**: [#850](https://github.com/groue/GRDB.swift/pull/850) by [@mtancock](https://github.com/mtancock): Add buildActiveScheme to playground settings so they'll build under Xcode 12
- **Fixed**: [#849](https://github.com/groue/GRDB.swift/pull/849) by [@MarshalGeazipp](https://github.com/MarshalGeazipp): Fix grammar mistake AssociationsBasics.md


## 5.0.2

Released October 6, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.1...v5.0.2)

- **Fixed**: [#844](https://github.com/groue/GRDB.swift/issues/844): Fix a crash in the demo app
- **Fixed**: [#847](https://github.com/groue/GRDB.swift/issues/847): Remove dependency on SQLITE_ENABLE_SNAPSHOT


## 5.0.1

Released September 27, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.0...v5.0.1)

- **Fixed**: [#841](https://github.com/groue/GRDB.swift/issues/841): Fix GRDB 5 regression with indexes on expressions
- The [GRDBCombineDemo](Documentation/DemoApps/GRDBCombineDemo/README.md) Combine + SwiftUI demo application was updated for the SwiftUI App lifecycle introduced in iOS 14.


## 5.0.0

Released September 20, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.0-beta.11...v5.0.0)

- **Fixed**: [#838](https://github.com/groue/GRDB.swift/issues/838): Have indexed columns inherit the `ifNotExists` flag from table creation.


## 5.0.0-beta.11

Released September 7, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.0-beta.10...v5.0.0-beta.11)

- **Breaking Change**: [#831](https://github.com/groue/GRDB.swift/pull/831): Improve Configuration.prepareDatabase


## 5.0.0-beta.10

Released July 30, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.0-beta.9...v5.0.0-beta.10)

- **New**: DatabasePool readers don't invalidate their database schema cache until schema is actually changed.
- **Breaking Change**: [#817](https://github.com/groue/GRDB.swift/pull/817): Allow query planner to optimize some boolean tests


## 5.0.0-beta.9

Released July 23, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.0-beta.8...v5.0.0-beta.9)

- **New**: [#813](https://github.com/groue/GRDB.swift/pull/813): Expose SQLite 3.31.1 APIs to iOS, macOS, tvOS, watchOS
- **Fixed**: [#814](https://github.com/groue/GRDB.swift/pull/814): Fix regression with views


## 5.0.0-beta.8

Released July 19, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.0-beta.7...v5.0.0-beta.8)

- **New**: [#811](https://github.com/groue/GRDB.swift/pull/811): Introduce RenameColumnAdapter


## 5.0.0-beta.7

Released July 14, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.0-beta.6...v5.0.0-beta.7)

- **New**: [#802](https://github.com/groue/GRDB.swift/pull/802) by [@GetToSet](https://github.com/GetToSet): Add tokenchars support for ascii tokenizer in FTS5
- **New**: `fetchSet` has joined `fetchCursor`, `fetchAll` and `fetchOne` in the group of universal fetching methods.
- **Breaking Change**: [#803](https://github.com/groue/GRDB.swift/pull/803): Remove FetchedRecordsController
- **Breaking Change**: Removed `TableRecord.primaryKey` and `selectPrimaryKey(as:)` introduced in 5.0.0-beta.5
- **Breaking Change**: Many types and methods that support the query builder used to be publicly exposed and flagged as experimental. They are now private, or renamed with an underscore prefix, which means they are not for public use.
- **Breaking Change**: Defining custom `FetchRequest` types is no longer supported.
- **Breaking Change**: Defining custom `RowAdapter` types is no longer supported.
- **Fixed**: Fix rare occurences of an `SQLITE_BUSY` error when opening a DatabaseSnapshot.
- **Fixed**: Work around an SQLite bug which prevents rollbacking a transaction with `sqlite3_commit_hook`.
- The [How do I filter records and only keep those that are NOT associated to another record?](README.md#how-do-i-filter-records-and-only-keep-those-that-are-not-associated-to-another-record) FAQ has been updated.


## 5.0.0-beta.6

Released June 29, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.0-beta.5...v5.0.0-beta.6)

- **New**: [#798](https://github.com/groue/GRDB.swift/pull/798): Debugging operators for ValueObservation
- **New**: [#800](https://github.com/groue/GRDB.swift/pull/800): Xcode 12 support
- **New**: [#801](https://github.com/groue/GRDB.swift/pull/801): Combine support
- **New**: Faster decoding of Date and DateComponents

### Documentation Diff

- The [ValueObservation Operators](README.md#valueobservation-operators) chapter was extended with a description of the two new debugging operators `handleEvents` and `print`.

- A new [GRDB ❤️ Combine](Documentation/Combine.md) guide describes the various Combine publishers that read, write, and observe the database.

- [GRDBCombineDemo](Documentation/DemoApps/GRDBCombineDemo/README.md) is a new Combine + SwiftUI demo application.


## 5.0.0-beta.5

Released June 15, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.0-beta.4...v5.0.0-beta.5)

- **Breaking Change** [#795](https://github.com/groue/GRDB.swift/pull/795): Enhanced support for WAL Checkpoints
- **New**: `Database.maximumStatementArgumentCount` returns the maximum number of arguments accepted by an SQLite statement.
- **New**: Optimize DatabasePool handling of ValueObservation when SQLite is compiled with the SQLITE_ENABLE_SNAPSHOT option. We are now able to avoid fetching the observed value when we can prove that the database wasn't changed between the initial fetch and the beginning of transaction tracking. This optimization avoids duplicate notifications.
- **New**: The query interface now exposes the primary key through `TableRecord.primaryKey`, as well as the `selectPrimaryKey(as:)` method.

### Documentation Diff

- The [Demo Application](Documentation/DemoApps/GRDBDemoiOS) was updated for better conformance with the [Good Practices for Designing Record Types](Documentation/GoodPracticesForDesigningRecordTypes.md) Guide.

- A new [FAQ: Associations](README.md#faq-associations) addresses three frequent questions:
    - [How do I filter records and only keep those that are associated to another record?](README.md#how-do-i-filter-records-and-only-keep-those-that-are-associated-to-another-record)
    - [How do I filter records and only keep those that are NOT associated to another record?](README.md#how-do-i-filter-records-and-only-keep-those-that-are-not-associated-to-another-record)
    - [How do I select only one column of an associated record?](README.md#how-do-i-select-only-one-column-of-an-associated-record)

- The guide for [Custom SQLite builds](Documentation/CustomSQLiteBuilds.md) now recommends enabling the `SQLITE_ENABLE_SNAPSHOT` option.


## 5.0.0-beta.4

Released June 6, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.0-beta.3...v5.0.0-beta.4)

### Documentation Diff

- [Migrating From GRDB 4 to GRDB 5](Documentation/GRDB5MigrationGuide.md) was updated for RxGRDB and GRDBCombine 1.0 beta 2, which haved change their way to configure how ValueObservation schedules fresh database values.
- The [SQL Functions](README.md#sql-functions) chapter was updated for the new `julianDay` and `dateTime` functions.

### New

- [#794](https://github.com/groue/GRDB.swift/pull/794): Name of Database Connections
- Add the `julianDay` and `dateTime` functions


## 5.0.0-beta.3

Released June 1, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.0-beta.2...v5.0.0-beta.3)

### Documentation Diff

- Updated FAQ: [How do I print a request as SQL?](README.md#how-do-i-print-a-request-as-sql)
- New FAQ: [How do I monitor the duration of database statements execution?](README.md#how-do-i-monitor-the-duration-of-database-statements-execution)

### Fixed

- [#784](https://github.com/groue/GRDB.swift/pull/784): Fix observation of eager-loaded to-many associations

### Breaking Changes

- [#790](https://github.com/groue/GRDB.swift/pull/790): Bump required iOS version to 10.0
- [#791](https://github.com/groue/GRDB.swift/pull/791): Extend tracing of statement execution


## 5.0.0-beta.2

Released May 11, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v5.0.0-beta...v5.0.0-beta.2)

### Documentation Diff

- [Migrating From GRDB 4 to GRDB 5](Documentation/GRDB5MigrationGuide.md) describes the sunsetting of custom `FetchRequest` types.
- The [Sharing a Database](Documentation/SharingADatabase.md) guide has an updated recommendation for opening writer connections to a shared database.

### New

- [#772](https://github.com/groue/GRDB.swift/pull/772): Update the Database Sharing Guide with mention of the persistent WAL mode
- [#775](https://github.com/groue/GRDB.swift/pull/775): DatabaseMigrator can check if it has been superseded

### Breaking Changes

- [#774](https://github.com/groue/GRDB.swift/pull/774): All requests are usable as SQL expressions and collections

### Fixed

- [#773](https://github.com/groue/GRDB.swift/pull/773): Allow subqueries to refer to outer tables


## 5.0.0-beta

Released May 2, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.14.0...v5.0.0-beta)

GRDB 5 is a release focused on **Swift 5.2**, and **removing technical debt**.

There are breaking changes, though as few as possible. They open the door for future library improvements. And they have GRDB, [GRDBCombine](https://github.com/groue/GRDBCombine), and [RxGRDB](https://github.com/RxSwiftCommunity/RxGRDB) offer a common behavior.

New features include support for SQL subqueries, and a simplified handling of database errors. The most demanding users will also find it easier to switch between the system SQLite, SQLCipher, and custom SQLite builds.

<details>
    <summary>A glimpse on the new features</summary>

All requests can now be used as subqueries:

```swift
// Define a request with the query interface or raw SQL
let maximumScore = Player.select(max(Column("score")))
let maximumScore: SQLRequest<Int> = "SELECT MAX(score) FROM player"

// Use the request as a subquery in the query interface
let request = Player.filter(Column("score") == maximumScore)
let bestPlayers = try request.fetchAll(db)

// Use the request as a subquery in SQL requests
let request: SQLRequest<Player> = "SELECT * FROM player WHERE score = (\(maximumScore))"
let bestPlayers = try request.fetchAll(db)
```

Catch specific SQLite error codes in a simplified fashion:

```swift
do {
    try ...
} catch DatabaseError.SQLITE_CONSTRAINT_FOREIGNKEY {
    // foreign key constraint error
} catch DatabaseError.SQLITE_CONSTRAINT {
    // any other constraint error
} catch {
    // any other database error
}
```

Reuse the same code for system SQLite, SQLCipher, and custom SQLite builds:

```swift
// Supported in all GRDB flavors
import GRDB
let sqliteVersion = String(cString: sqlite3_libversion())
```

</details>

### Documentation Diff

- **[Migrating From GRDB 4 to GRDB 5](Documentation/GRDB5MigrationGuide.md)**: how to upgrade your apps, and deal with breaking changes.
- [ValueObservation](README.md#valueobservation): this chapter describes the new ValueObservation behaviors.
- [DatabaseError](README.md#databaseerror): learn how to catch and match DatabaseError on their codes, in a fashion similar to `CocoaError`.
- [Batch Updates](README.md#update-requests): this chapter is updated for the new `set(to:)` method.
- [SQL Operators](README.md#sql-operators): introduces support for SQL and query interface subqueries.
- [How do I print a request as SQL?](README.md#how-do-i-print-a-request-as-sql) This FAQ was updated for GRDB 5.
- [SQL Interpolation](Documentation/SQLInterpolation.md): this guide now describes how to embed subqueries and record columns in your SQL literals.
- [Joined Queries Support](README.md#joined-queries-support): describes the GRDB 5 way of dealing with complex and hand-crafted SQL queries.
- [Raw SQLite Pointers](README.md#raw-sqlite-pointers) and [Custom SQLite builds](Documentation/CustomSQLiteBuilds.md): `import GRDB` now provides access to the full [C SQLite API](https://www.sqlite.org/capi3ref.html), and custom SQLite builds.

### New

- [#749](https://github.com/groue/GRDB.swift/pull/749): Drop submodules used by performance tests
- [#754](https://github.com/groue/GRDB.swift/pull/754): Match DatabaseError on ResultCode
- [#756](https://github.com/groue/GRDB.swift/pull/756): Export the underlying SQLite library

### Breaking Changes

- [#719](https://github.com/groue/GRDB.swift/pull/719): Bump required Swift version to 5.2
- [#720](https://github.com/groue/GRDB.swift/pull/720): Turn deprecated APIs into unavailable ones
- [#722](https://github.com/groue/GRDB.swift/pull/722): SE-0253: Callable values of user-defined nominal types
- [#728](https://github.com/groue/GRDB.swift/pull/728): Make ValueObservation error handling mandatory
- [#729](https://github.com/groue/GRDB.swift/pull/729): ValueObservation always emits an initial value
- [#731](https://github.com/groue/GRDB.swift/pull/731): Hide ValueObservation implementation details
- [#732](https://github.com/groue/GRDB.swift/pull/732): Remove ValueObservation.compactMap
- [#736](https://github.com/groue/GRDB.swift/pull/736): Relax ValueObservation Guarantees
- [#737](https://github.com/groue/GRDB.swift/pull/737): Force implicit database region for ValueObservation
- [#738](https://github.com/groue/GRDB.swift/pull/738): Remove all observationForCount/All/First methods
- [#742](https://github.com/groue/GRDB.swift/pull/742): ValueObservation scheduling is no longer an attribute of the observation
- [#745](https://github.com/groue/GRDB.swift/pull/745): Explicit ValueObservation cancellation
- [#747](https://github.com/groue/GRDB.swift/pull/747): Rename GRDBCustomSQLite to GRDB
- [#750](https://github.com/groue/GRDB.swift/pull/750): Batch updates do not need any operator
- [#752](https://github.com/groue/GRDB.swift/pull/752): Remove ValueObservation.combine
- [#770](https://github.com/groue/GRDB.swift/pull/770): Subqueries

### Fixed

- [#601](https://github.com/groue/GRDB.swift/pull/601): ValueObservation won't start until concurrent write transaction has ended
- [#697](https://github.com/groue/GRDB.swift/pull/697): `SQLInterpolation` could not work with `QueryInterfaceRequest`
- [#743](https://github.com/groue/GRDB.swift/pull/743): Rename GRDBCustomSQLite to GRDB for compatibility with dependents?


## 4.14.0

Released April 23, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.13.0...v4.14.0)

**New**

- [#766](https://github.com/groue/GRDB.swift/pull/766) by [@mtancock](https://github.com/mtancock): Add Codable support to DatabaseDateComponents


## 4.13.0

Released April 15, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.12.2...v4.13.0)

**Fixed**

- Restored support for Xcode 10.0 and Xcode 10.1, broken in 4.12.2
- [#759](https://github.com/groue/GRDB.swift/pull/759): Fix batch updates of complex requests

**New**

- [#761](https://github.com/groue/GRDB.swift/pull/761): Deprecate the batch update `<-` operator


## 4.12.2

Released April 13, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.12.1...v4.12.2)

**Fixed**

- [#757](https://github.com/groue/GRDB.swift/pull/757): Don't load association inflections unless necessary


## 4.12.1

Released March 29, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.12.0...v4.12.1)

**Fixed**

- [#744](https://github.com/groue/GRDB.swift/pull/744): Fix DatabaseMigrator deadlock with serial target queues


## 4.12.0

Released March 21, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.11.0...v4.12.0)

**New**

- Batch updates now accept nil assignments:
    
    ```swift
    // UPDATE player SET score = NULL
    try Player.updateAll(db, scoreColumn <- nil)
    ```

- DatabaseMigrator can now recreate the database if a migration has been removed, or renamed (addresses [#725](https://github.com/groue/GRDB.swift/issues/725)).
    
- DatabaseMigrator querying methods have been enhanced:
    
    ```swift
    // New
    dbQueue.read(migrator.hasCompletedMigrations)
    dbQueue.read(migrator.completedMigrations).contains("v2")
    dbQueue.read(migrator.completedMigrations).last == "v2"
    dbQueue.read(migrator.appliedMigrations)
    
    // Deprecated
    migrator.hasCompletedMigrations(in: dbQueue)
    migrator.hasCompletedMigrations(in: dbQueue, through: "v2")
    migrator.lastCompletedMigration(in: dbQueue) == "v2"
    migrator.appliedMigrations(in: dbQueue)
    ```


## 4.11.0

Released March 2, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.10.0...v4.11.0)

### New

- [#706](https://github.com/groue/GRDB.swift/pull/706): Enhance SQLLiteral and SQL interpolation again
- [#710](https://github.com/groue/GRDB.swift/pull/710): Check if all migrations have been applied
- [#712](https://github.com/groue/GRDB.swift/pull/712) by [@pakko972](https://github.com/pakko972): Automatic iOS memory management
- [#713](https://github.com/groue/GRDB.swift/pull/713): Enhance DatabaseMigrator isolation

### Breaking Change

- [#709](https://github.com/groue/GRDB.swift/pull/709): Simplify DatabaseMigrator API

Database migrations have a new behavior which is a breaking change. However, it is very unlikely to impact your application.

In previous versions of GRDB, a foreign key violation would immediately prevent a migration from successfully complete. Now, foreign key checks are deferred until the end of each migration. This means that some migrations will change their behavior:

```swift
// Used to fail, now succeeds
migrator.registerMigration(...) { db in
    try violateForeignKeyConstraint(db)
    try fixForeignKeyConstraint(db)
}

// The catch clause is no longer called
migrator.registerMigration(...) { db in
    do {
        try performChanges(db)
    } catch let error as DatabaseError where error.resultCode == .SQL_CONSTRAINT {
        // Handle foreign key error
    }
}
```

If your application happens to define migrations that are impacted by this change, please open an issue so that we find a way to restore the previous behavior.


## 4.10.0

Released February 23, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.9.0...v4.10.0)

**New**

- [#689](https://github.com/groue/GRDB.swift/pull/689) by [@gjeck](https://github.com/gjeck): Add support for renaming columns within a table
- [#690](https://github.com/groue/GRDB.swift/pull/690): Enhance SQLLiteral and SQL interpolation


## 4.9.0

Released January 17, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.8.1...v4.9.0)

**New**

- [#683](https://github.com/groue/GRDB.swift/pull/683): String concatenation
- [#685](https://github.com/groue/GRDB.swift/pull/685) by [@gjeck](https://github.com/gjeck): Add cache for TableRecord.defaultDatabaseTableName


## 4.8.1

Released January 12, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.8.0...v4.8.1)

**Fixed**

- [#677](https://github.com/groue/GRDB.swift/pull/677): Fix associations altered by another association


## 4.8.0

Released January 8, 2020 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.7.0...v4.8.0)

**New**

- [#676](https://github.com/groue/GRDB.swift/pull/676): More batch delete and update


## 4.7.0

Released December 18, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.6.2...v4.7.0)

**New**

- [#656](https://github.com/groue/GRDB.swift/pull/656): Type inference of selected columns
- [#659](https://github.com/groue/GRDB.swift/pull/659): Database interruption
- [#660](https://github.com/groue/GRDB.swift/pull/660): Database Lock Prevention
- [#662](https://github.com/groue/GRDB.swift/pull/662): Upgrade custom SQLite builds to version 3.30.1 (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib))
- [#668](https://github.com/groue/GRDB.swift/pull/668): Database Suspension

### Breaking Changes

[Custom SQLite builds](Documentation/CustomSQLiteBuilds.md) now disable by default the support for the [Double-quoted String Literals misfeature](https://sqlite.org/quirks.html#dblquote). This is a technically a breaking change, but it fixes an SQLite bug. You can restore the previous behavior if your application relies on it:

```swift
// Enable support for the Double-quoted String Literals misfeature
var configuration = Configuration()
configuration.acceptsDoubleQuotedStringLiterals = true
let dbQueue = try DatabaseQueue(path: ..., configuration: configuration)
```


### Documentation Diff

The new [Interrupt a Database](README.md#interrupt-a-database) chapter documents the new `interrupt()` method.

The new [Sharing a Datatase in an App Group Container](Documentation/AppGroupContainers.md) guide explains how to setup GRDB when you share a database in an iOS App Group container.


### API Diff

```diff
 struct Configuration {
+    var observesSuspensionNotifications: Bool // Experimental
+    var acceptsDoubleQuotedStringLiterals: Bool
 }

 class Database {
+    static let suspendNotification: Notification.Name // Experimental
+    static let resumeNotification: Notification.Name  // Experimental
 }

 extension DatabaseError {
+    var isInterruptionError: Bool { get }
 }
 
 protocol DatabaseReader {
+    func interrupt()
 }
 
 extension SQLSpecificExpressible {
+    #if GRDBCUSTOMSQLITE
+    var ascNullsLast: SQLOrderingTerm { get }
+    var descNullsFirst: SQLOrderingTerm { get }
+    #endif
 }
```


## 4.6.2

Released November 20, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.6.1...v4.6.2)

**Fixed**

- [#653](https://github.com/groue/GRDB.swift/pull/653) by [@michaelkirk-signal](https://github.com/michaelkirk-signal): Fix DatabaseMigrator.appliedMigrations() error on empty database


## 4.6.1

Released November 10, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.6.0...v4.6.1)

**Fixed**

- [#647](https://github.com/groue/GRDB.swift/pull/647): Honor conflict resolution for batch updates


## 4.6.0

Released November 9, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.5.0...v4.6.0)

**New**

- [#646](https://github.com/groue/GRDB.swift/pull/646): Batch updates

### Documentation Diff

The [Update Requests](README.md#update-requests) chapter documents the new support for batch updates introduced in the [query interface](README.md#the-query-interface).

The [Associations Guide](Documentation/AssociationsBasics.md) has gained a new [Ordered Associations](Documentation/AssociationsBasics.md#ordered-associations) chapter which explains how to define ordered HasMany and HasManyThrough associations.


## 4.5.0

Released October 15, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.4.0...v4.5.0)

**Fixed**

- The `DatabaseMigrator.eraseDatabaseOnSchemaChange` option no longer fails when migrations depend on database configuration.
- Fixed `DatabasePool.reentrantRead` which was not actually reentrant.
- [#631](https://github.com/groue/GRDB.swift/pull/631): Fix custom SQLite builds
- [#632](https://github.com/groue/GRDB.swift/pull/632) by [@runhum](https://github.com/runhum): Fix documentation typo

**New**

- [#622](https://github.com/groue/GRDB.swift/pull/622): Allow observation of FTS4 virtual tables
- [#627](https://github.com/groue/GRDB.swift/pull/627): Swift Package Manager: define SQLite as a system library target
- [#633](https://github.com/groue/GRDB.swift/pull/633): SQLITE_ENABLE_PREUPDATE_HOOK support with CocoaPods
- [#635](https://github.com/groue/GRDB.swift/pull/635): Sunset FetchedRecordsController

### Documentation Diff

The [Support for SQLite Pre-Update Hooks](README.md#support-for-sqlite-pre-update-hooks) chapter has been updated with a way to enable extra GRDB APIs for the SQLITE_ENABLE_PREUPDATE_HOOK option with CocoaPods.

The [Demo Application](Documentation/DemoApps/GRDBDemoiOS) no longer uses [FetchedRecordsController](Documentation/FetchedRecordsController.md), which has been sunsetted. Instead, it tracks database changes with [ValueObservation](README.md#valueobservation), and animates its table view with the Swift built-in [difference(from:)](https://developer.apple.com/documentation/swift/bidirectionalcollection/3200721-difference) method.


## 4.4.0

Released September 6, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.3.0...v4.4.0)


### New

- [#602](https://github.com/groue/GRDB.swift/pull/602): Don't keep the sqlCipher passphrase in memory longer than necessary
- [#603](https://github.com/groue/GRDB.swift/pull/603): DatabasePool write barrier


### Documentation Diff

SQLCipher passphrase management has been refactored: you will get deprecation warnings. Check out the rewritten [Encryption](README.md#encryption) chapter in order to migrate your code and remove those warnings.

The [Advanced DatabasePool](README.md#advanced-databasepool) chapter has been extended for the new `barrierWriteWithoutTransaction` method.


### API Diff

**Deprecations**

```diff
 class DatabaseQueue {
+    @available(*, deprecated)
     func change(passphrase: String) throws
 }
 
 class DatabasePool {
+    @available(*, deprecated)
     func change(passphrase: String) throws
 }
 
 struct Configuration {
+    @available(*, deprecated)
     var passphrase: String?
 }
```

**New Methods**

```diff 
 class DatabasePool {
+    func barrierWriteWithoutTransaction<T>(_ updates: (Database) throws -> T) rethrows -> T
+    func invalidateReadOnlyConnections()
 }
 
 class Database {
+    func usePassphrase(_ passphrase: String) throws
+    func changePassphrase(_ passphrase: String) throws
+    var lastErrorCode: ResultCode
+    var lastErrorMessage: String?
 }
```


## 4.3.0

Released August 28, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.2.1...v4.3.0)

**New**

- [#600](https://github.com/groue/GRDB.swift/pull/600) by [@kdubb](https://github.com/kdubb): Add support for tvOS


## 4.2.1

Released August 13, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.2.0...v4.2.1)

**Fixed**

- [#592](https://github.com/groue/GRDB.swift/pull/592): Fix Data interpolation


## 4.2.0

Released August 6, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.1.1...v4.2.0)

**New**

- [#570](https://github.com/groue/GRDB.swift/pull/570) by [@chrisballinger](https://github.com/chrisballinger): Allow Swift static library integration via CocoaPods
- [#576](https://github.com/groue/GRDB.swift/pull/576): Expose table name and full-text filtering methods to DerivableRequest
- [#586](https://github.com/groue/GRDB.swift/pull/586): Automatic region tracking for ValueObservation

**Fixed**

- [#560](https://github.com/groue/GRDB.swift/pull/560) by [@bellebethcooper](https://github.com/bellebethcooper): Minor typo fix
- [#562](https://github.com/groue/GRDB.swift/pull/562): Fix crash when using more than one DatabaseCollation
- [#577](https://github.com/groue/GRDB.swift/pull/577): Rename `aliased(_:)` methods to `forKey(_:)`
- [#585](https://github.com/groue/GRDB.swift/pull/585): Fix use of SQLite authorizers

**Other**

- [#563](https://github.com/groue/GRDB.swift/pull/563): More tests for eager loading of hasMany associations
- [#574](https://github.com/groue/GRDB.swift/pull/574): SwiftLint


### Documentation Diff

The [ValueObservation](README.md#valueobservation) chapter has been updated so that it fosters the new `ValueObservation.tracking(value:)` method. Other ways to define observations are now described as optimizations.


### API Diff

```diff
-protocol DerivableRequest: FilteredRequest, JoinableRequest, OrderedRequest, SelectionRequest { }
+protocol DerivableRequest: FilteredRequest, JoinableRequest, OrderedRequest, SelectionRequest, TableRequest { }

-extension QueryInterfaceRequest {
-    func matching(_ pattern: FTS3Pattern?) -> QueryInterfaceRequest<T>
-}
-extension QueryInterfaceRequest {
-    func matching(_ pattern: FTS5Pattern?) -> QueryInterfaceRequest<T>
-}
+extension TableRequest where Self: FilteredRequest {
+    func matching(_ pattern: FTS3Pattern?) -> Self
+}
+extension TableRequest where Self: FilteredRequest {
+    func matching(_ pattern: FTS5Pattern?) -> Self
+}
 
 protocol Association: DerivableRequest {
-    associatedtype OriginRowDecoder
+    associatedtype OriginRowDecoder: TableRecord
 }

-struct BelongsToAssociation<Origin, Destination>: AssociationToOne { }
-struct HasManyAssociation<Origin, Destination>: AssociationToMany { }
-struct HasManyThroughAssociation<Origin, Destination>: AssociationToMany { }
-struct HasOneAssociation<Origin, Destination>: AssociationToOne { }
-struct HasOneThroughAssociation<Origin, Destination>: AssociationToOne { }
+struct BelongsToAssociation<Origin: TableRecord, Destination: TableRecord>: AssociationToOne { }
+struct HasManyAssociation<Origin: TableRecord, Destination: TableRecord>: AssociationToMany { }
+struct HasManyThroughAssociation<Origin: TableRecord, Destination: TableRecord>: AssociationToMany { }
+struct HasOneAssociation<Origin: TableRecord, Destination: TableRecord>: AssociationToOne { }
+struct HasOneThroughAssociation<Origin: TableRecord, Destination: TableRecord>: AssociationToOne { }

-struct QueryInterfaceRequest<T>: DerivableRequest { }
+struct QueryInterfaceRequest<T>: FilteredRequest, OrderedRequest, SelectionRequest, TableRequuest { }
+extension QueryInterfaceRequest: JoinableRequest where T: TableRecord { }
+extension QueryInterfaceRequest: DerivableRequest where T: TableRecord { }

 extension AssociationAggregate {
+    @available(*, deprecated, renamed: "forKey(_:)")
     func aliased(_ name: String) -> AssociationAggregate<RowDecoder>
+    func forKey(_ name: String) -> AssociationAggregate<RowDecoder>
 
+    @available(*, deprecated, renamed: "forKey(_:)")
     func aliased(_ key: CodingKey) -> AssociationAggregate<RowDecoder>
+    func forKey(_ key: CodingKey) -> AssociationAggregate<RowDecoder>
 }
 
 extension SQLSpecificExpressible {
+    @available(*, deprecated, renamed: "forKey(_:)")
     func aliased(_ name: String) -> SQLSelectable
+    func forKey(_ name: String) -> SQLSelectable
 
+    @available(*, deprecated, renamed: "forKey(_:)")
     func aliased(_ key: CodingKey) -> SQLSelectable
+    func forKey(_ key: CodingKey) -> SQLSelectable
 }
 
 extension ValueObservation where Reducer == Void {
+    static func tracking<Value>(fetch: @escaping (Database) throws -> Value) -> ValueObservation<ValueReducers.Fetch<Value>>
 }
```


## 4.1.1

Released June 22, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.1.0...v4.1.1)

This version is identical to 4.1.0.

## 4.1.0

Released June 20, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.0.1...v4.1.0)

- [#537](https://github.com/groue/GRDB.swift/pull/537): Remove useless parenthesis from generated SQL
- [#538](https://github.com/groue/GRDB.swift/pull/538) by [@Timac](https://github.com/Timac): Add FAQ to clarify "Wrong number of statement arguments" error with "like '%?%'"
- [#539](https://github.com/groue/GRDB.swift/pull/539): Expose joining methods on both requests and associations
- [#540](https://github.com/groue/GRDB.swift/pull/540): Update SQLite to 3.28.0 (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib))
- [#542](https://github.com/groue/GRDB.swift/pull/542): Move eager loading of hasMany associations to FetchRequest
- [#546](https://github.com/groue/GRDB.swift/pull/546) by [@robcas3](https://github.com/robcas3): Fix SPM errors with Xcode 11 beta
- [#549](https://github.com/groue/GRDB.swift/pull/549) Support for Combine
- [#550](https://github.com/groue/GRDB.swift/pull/550) Asynchronous Database Access Methods
- [#555](https://github.com/groue/GRDB.swift/pull/555) Avoid a crash when read-only access can't be established

### Documentation Diff

Good practices evolve: the [Define Record Requests](Documentation/GoodPracticesForDesigningRecordTypes.md#define-record-requests) chapter of the The [Good Practices for Designing Record Types](Documentation/GoodPracticesForDesigningRecordTypes.md) has been rewritten.

The [Examples of Record Definitions](README.md#examples-of-record-definitions) has been extended with a sample record optimized for fetching performance.

The [ValueObservation](README.md#valueobservation) chapter has been updated with new APIs for building observation, and combining observations together in order to avoid data races.

The [ValueObservation Error Handling](README.md#valueobservation-error-handling) chapter explains with more details how to deal with observation errors.

### API Diff

<details>
    <summary>Asynchronous database access methods</summary>

```diff
 protocol DatabaseReader {
+    var configuration: Configuration { get }
+
+    #if compiler(>=5.0)
+    func asyncRead(_ block: @escaping (Result<Database, Error>) -> Void)
+    #endif
 }
 
 protocol DatabaseWriter {
+    func asyncWriteWithoutTransaction(_ updates: @escaping (Database) -> Void)
+
+    #if compiler(>=5.0)
+    func asyncWrite<T>(_ updates: @escaping (Database) throws -> T, completion: @escaping (Database, Result<T, Error>) -> Void)
+    #endif
 }
```

</details>

<details>
    <summary>ValueObservation changes</summary>

```diff
+extension FetchRequest {
+    func observationForCount() -> ValueObservation<...>
+}
+extension FetchRequest where RowDecoder: ... {
+    func observationForAll() -> ValueObservation<...>
+    func observationForFirst() -> ValueObservation<...>
+)
+extension TableRecord {
+    static func observationForCount() -> ValueObservation<...>
+    static func observationForAll() -> ValueObservation<...>
+    static func observationForFirst() -> ValueObservation<...>
+}
 extension ValueObservation where ... {
+    @available(*, deprecated)
     static func trackingCount<Request: FetchRequest>(_ request: Request) -> ValueObservation<...>
+    @available(*, deprecated)
     static func trackingAll<Request: FetchRequest>(_ request: Request) -> ValueObservation<...>
+    @available(*, deprecated)
     static func trackingOne<Request: FetchRequest>(_ request: Request) -> ValueObservation<...>
 }
 extension ValueObservation where Reducer: ValueReducer {
-    func start(in reader: DatabaseReader, onError: ((Error) -> Void)? = nil, onChange: @escaping (Reducer.Value) -> Void) throws -> TransactionObserver
+    func start(in reader: DatabaseReader, onChange: @escaping (Reducer.Value) -> Void) throws -> TransactionObserver
+    func start(in reader: DatabaseReader, onError: @escaping (Error) -> Void, onChange: @escaping (Reducer.Value) -> Void) -> TransactionObserver
+    func combine<..., Combined>(..., transform: @escaping (...) -> Combined) -> ValueObservation<...>
 }
 extension ValueObservation where Reducer: ValueReducer, Reducer.Value: Equatable {
+    @available(*, deprecated)
     func distinctUntilChanged() -> ValueObservation<...>
+    func removeDuplicates() -> ValueObservation<...>
 }
```

</details>

<details>
    <summary>Joining methods on both requests and associations</summary>

```diff
+protocol JoinableRequest {
+    associatedtype RowDecoder
+}
+
+extension JoinableRequest {
+    func including<A: AssociationToMany>(all association: A) -> Self where A.OriginRowDecoder == RowDecoder
+    func including<A: Association>(optional association: A) -> Self where A.OriginRowDecoder == RowDecoder
+    func including<A: Association>(required association: A) -> Self where A.OriginRowDecoder == RowDecoder
+    func joining<A: Association>(optional association: A) -> Self where A.OriginRowDecoder == RowDecoder
+    func joining<A: Association>(required association: A) -> Self where A.OriginRowDecoder == RowDecoder
+}

-protocol DerivableRequest: SelectionRequest, FilteredRequest, OrderedRequest { }
+protocol DerivableRequest: SelectionRequest, FilteredRequest, OrderedRequest, JoinableRequest { }
```

</details>

<details>
    <summary>FetchRequest changes</summary>

```diff
+struct PreparedRequest {
+    var statement: SelectStatement
+    var adapter: RowAdapter?
+    init(statement: SelectStatement, adapter: RowAdapter? = nil)
+}

 protocol FetchRequest {
+    // deprecated
     func prepare(_ db: Database, forSingleResult singleResult: Bool) throws -> (SelectStatement, RowAdapter?)
+    func makePreparedRequest(_ db: Database, forSingleResult singleResult: Bool) throws -> PreparedRequest
 }
```

The core FetchRequest preparation method is now `makePreparedRequest(_:forSingleResult:)`. The former core method `prepare(_:forSingleResult:)` will remain a requirement of the FetchRequest protocol until GRDB 5 due to semantic versioning constraints. Both methods are provided with a default implementation which makes each one depend on the other: this creates an infinite loop unless you provide at least one of them. If you have a choice, implement only `makePreparedRequest(_:forSingleResult:)`.

</details>


## 4.0.1

Released May 25, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v4.0.0...v4.0.1)

- [#533](https://github.com/groue/GRDB.swift/pull/533): Fix eager loading of HasManyThrough associations
- [#534](https://github.com/groue/GRDB.swift/pull/534): Support for CocoaPods 1.7.0
- [#535](https://github.com/groue/GRDB.swift/pull/535): Update the Good Practices for Designing Record Types

### Documentation Diff

The [Good Practices for Designing Record Types](Documentation/GoodPracticesForDesigningRecordTypes.md) have been enhanced and completed with a whole new section about "database managers".


## 4.0.0

Released May 23, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v3.7.0...v4.0.0)

GRDB 4 is a release focused on **Swift 5**, and **enhancements on associations between record types**.

It comes with new features, but also a few breaking changes. The [GRDB 4 Migration Guide](Documentation/GRDB3MigrationGuide.md) will help you upgrading your applications.

### New

- [#478](https://github.com/groue/GRDB.swift/pull/478): Swift 5: SQL interpolation
- [#484](https://github.com/groue/GRDB.swift/pull/484): SE-0193 Cross-module inlining and specialization
- [#486](https://github.com/groue/GRDB.swift/pull/486): Refactor PersistenceError.recordNotFound
- [#488](https://github.com/groue/GRDB.swift/pull/488): ValueObservation Cleanup
- [#490](https://github.com/groue/GRDB.swift/pull/490): Indirect Associations
- [#493](https://github.com/groue/GRDB.swift/pull/493): Bump SQLite to [3.27.2](https://www.sqlite.org/releaselog/3_27_2.html)
- [#499](https://github.com/groue/GRDB.swift/pull/499): Extract EncodableRecord from MutablePersistableRecord
- [#502](https://github.com/groue/GRDB.swift/pull/502): Rename Future to DatabaseFuture
- [#503](https://github.com/groue/GRDB.swift/pull/503): IFNULL support for association aggregates
- [#508](https://github.com/groue/GRDB.swift/pull/508) by [@michaelkirk-signal](https://github.com/michaelkirk-signal): Allow Database Connection Configuration
- [#510](https://github.com/groue/GRDB.swift/pull/510) by [@charlesmchen-signal](https://github.com/charlesmchen-signal): Expose DatabaseRegion(table:) initializer
- [#515](https://github.com/groue/GRDB.swift/pull/515) by [@alextrob](https://github.com/alextrob): Add "LIMIT 1" to `fetchOne` requests
- [#517](https://github.com/groue/GRDB.swift/pull/517): Support for SQLCipher 4
- [#525](https://github.com/groue/GRDB.swift/pull/525): Eager Loading of HasMany associations

### Fixed

- [#511](https://github.com/groue/GRDB.swift/pull/511) by [@charlesmchen-signal](https://github.com/charlesmchen-signal): Fix DatabasePool.setupMemoryManagement()

### Breaking Changes

- Swift 4.0 and Swift 4.1 are no longer supported. Minimum Swift version is now Swift 4.2.
- iOS 8 is no longer supported. Minimum deployment target is now iOS 9.0.
- Deprecated APIs are no longer available.
- See the [Migration Guide](Documentation/GRDB3MigrationGuide.md) and the API diff below for other changes.

### Documentation Diff

- [SQL Interpolation](Documentation/SQLInterpolation.md): this new document describes the new SQL interpolation feature.
- The [Associations Guide](Documentation/AssociationsBasics.md) has been updated:
    - [Required Protocols](Documentation/AssociationsBasics.md#required-protocols) describes which protocols your record types have to conform to in order to use Associations features.
    - [The Types of Associations](Documentation/AssociationsBasics.md#the-types-of-associations) introduces the new HasManyThrough and HasOneThrough associations.
    - [Convention for Database Table Names](Documentation/AssociationsBasics.md#convention-for-database-table-names) describes how GRDB inflects database table names into their singular or plural forms, depending on your usages of associations.
    - [Joining And Prefetching Associated Records](Documentation/AssociationsBasics.md#joining-and-prefetching-associated-records) describes the new `including(all:)` method.
    - [Fetching Values from Associations](Documentation/AssociationsBasics.md#fetching-values-from-associations) explains how to decode record types from associated requests, including requests built with the new `including(all:)` method.
    - [Aggregate Operations](Documentation/AssociationsBasics.md#aggregate-operations) describes all the ways to transform association aggregates with logical, comparison and arithmetic operators.

### API diff

<details>
    <summary>Associations: indirect associations and eager loading of HasMany associations</summary>

**New AssociationToOne and AssociationToMany protocols**

```diff
+protocol AssociationToOne: Association { }
+protocol AssociationToMany: Association { }
+extension AssociationToMany {
+    var count: AssociationAggregate<OriginRowDecoder> { get }
+    var isEmpty: AssociationAggregate<OriginRowDecoder> { get }
+    func average(_ expression: SQLExpressible) -> AssociationAggregate<OriginRowDecoder>
+    func max(_ expression: SQLExpressible) -> AssociationAggregate<OriginRowDecoder>
+    func min(_ expression: SQLExpressible) -> AssociationAggregate<OriginRowDecoder>
+    func sum(_ expression: SQLExpressible) -> AssociationAggregate<OriginRowDecoder>
+}

+extension BelongsToAssociation: AssociationToOne { }
+extension HasManyAssociation: AssociationToMany { }
+extension HasOneAssociation: AssociationToOne { }
```

**New HasManyThroughAssociation and HasOneThroughAssociation**

```diff
+struct HasManyThroughAssociation<Origin, Destination>: AssociationToMany { }
+extension HasManyThroughAssociation: TableRequest where Destination: TableRecord { }
+struct HasOneThroughAssociation<Origin, Destination>: AssociationToOne { }
+extension HasOneThroughAssociation: TableRequest where Destination: TableRecord { }
 
 extension TableRecord {
+    static func hasMany<Pivot, Target>(_ destination: Target.RowDecoder.Type, through pivot: Pivot, using target: Target, key: String? = nil) -> HasManyThroughAssociation<Self, Target.RowDecoder> where Pivot: Association, Target: Association, Pivot.OriginRowDecoder == Self, Pivot.RowDecoder == Target.OriginRowDecoder
+    static func hasOne<Pivot, Target>(_ destination: Target.RowDecoder.Type, through pivot: Pivot, using target: Target, key: String? = nil) -> HasOneThroughAssociation<Self, Target.RowDecoder> where Pivot: AssociationToOne, Target: AssociationToOne, Pivot.OriginRowDecoder == Self, Pivot.RowDecoder == Target.OriginRowDecoder
 }
```

**Eager loading of HasMany associations**

```diff
 extension TableRecord {
+    static func including<A: AssociationToMany>(all association: A) -> QueryInterfaceRequest<Self> where A.OriginRowDecoder == Self
 }
 
 extension Association {
+    func including<A: AssociationToMany>(all association: A) -> Self where A.OriginRowDecoder == RowDecoder
 }
 
 extension QueryInterfaceRequest {
+    func including<A: AssociationToMany>(all association: A) -> QueryInterfaceRequest where A.OriginRowDecoder == RowDecoder
 }
```

**Accessing eager loaded rows**

```diff
 class Row {
+    var prefetchedRows: Row.PrefetchedRowsView { get }
+    subscript<Collection>(_ key: String) -> Collection where Collection: RangeReplaceableCollection, Collection.Element: FetchableRecord { get }
+    subscript<Record: FetchableRecord & Hashable>(_ key: String) -> Set<Record> { get }
 }

 extension Row {
+    struct PrefetchedRowsView: Equatable {
+       var isEmpty: Bool { get }
+       var keys: Set<String> { get }
+       subscript(_ key: String) -> [Row]? { get }
+    }
 }
```

</details>

<details>
    <summary>SQL Interpolation</summary>

```diff
+extension SQLRequest: ExpressibleByStringInterpolation {
+    init(stringInterpolation sqlInterpolation: SQLInterpolation)
+}
 
+struct SQLLiteral: ExpressibleByStringInterpolation {
+    var sql: String { get }
+    var arguments: StatementArguments { get }
+    init(stringInterpolation sqlInterpolation: SQLInterpolation)
+    init(sql: String, arguments: StatementArguments = StatementArguments())
+    func mapSQL(_ transform: (String) throws -> String) rethrows -> SQLLiteral
+    mutating func append(sql: String, arguments: StatementArguments = StatementArguments())
+    mutating func append(literal sqlLiteral: SQLLiteral)
+    static func + (lhs: SQLLiteral, rhs: SQLLiteral) -> SQLLiteral
+    static func += (lhs: inout SQLLiteral, rhs: SQLLiteral)
+}

+extension Sequence where Element == SQLLiteral {
+    func joined(separator: String = "") -> SQLLiteral
+}

+struct SQLInterpolation: StringInterpolationProtocol {
+    mutating func appendLiteral(_ sql: String)
+    mutating func appendInterpolation(sql: String, arguments: StatementArguments = StatementArguments())
+    mutating func appendInterpolation(literal sqlLiteral: SQLLiteral)
+    mutating func appendInterpolation<T: TableRecord>(_ table: T.Type)
+    mutating func appendInterpolation<T: TableRecord>(tableOf record: T)
+    mutating func appendInterpolation(_ selection: SQLSelectable)
+    mutating func appendInterpolation<T: SQLExpressible>(_ expressible: T?)
+    mutating func appendInterpolation(_ codingKey: CodingKey)
+    mutating func appendInterpolation<S>(_ sequence: S) where S: Sequence, S.Element: SQLExpressible
+    mutating func appendInterpolation(_ ordering: SQLOrderingTerm)
+    mutating func appendInterpolation<T>(_ request: SQLRequest<T>)
+}
```

</details>

<details>
    <summary>Raw SQL breaking changes</summary>

```diff
 class Database {
-    func makeSelectStatement(_ sql: String) throws -> SelectStatement
-    func makeUpdateStatement(_ sql: String) throws -> UpdateStatement
+    func makeSelectStatement(sql: String) throws -> SelectStatement
+    func makeUpdateStatement(sql: String) throws -> UpdateStatement

-    func cachedSelectStatement(_ sql: String) throws -> SelectStatement
-    func cachedUpdateStatement(_ sql: String) throws -> UpdateStatement
+    func cachedSelectStatement(sql: String) throws -> SelectStatement
+    func cachedUpdateStatement(sql: String) throws -> UpdateStatement

-    func execute(_ sql: String, arguments: StatementArguments? = nil) throws
+    func execute(sql: String, arguments: StatementArguments = StatementArguments()) throws
 }
 
 class Row {
-    static func fetchCursor(_ db: Database, _ sql: String, arguments: StatementArguments? = nil, adapter: RowAdapter? = nil) throws -> RowCursor
-    static func fetchAll(_ db: Database, _ sql: String, arguments: StatementArguments? = nil, adapter: RowAdapter? = nil) throws -> [Row]
-    static func fetchOne(_ db: Database, _ sql: String, arguments: StatementArguments? = nil, adapter: RowAdapter? = nil) throws -> Row?
+    static func fetchCursor(_ db: Database, sql: String, arguments: StatementArguments = StatementArguments(), adapter: RowAdapter? = nil) throws -> RowCursor
+    static func fetchAll(_ db: Database, sql: String, arguments: StatementArguments = StatementArguments(), adapter: RowAdapter? = nil) throws -> [Row]
+    static func fetchOne(_ db: Database, sql: String, arguments: StatementArguments = StatementArguments(), adapter: RowAdapter? = nil) throws -> Row?
 }
 
 extension FetchableRecord {
-    static func fetchCursor(_ db: Database, _ sql: String, arguments: StatementArguments? = nil, adapter: RowAdapter? = nil) throws -> RecordCursor<Self>
-    static func fetchAll(_ db: Database, _ sql: String, arguments: StatementArguments? = nil, adapter: RowAdapter? = nil) throws -> [Self]
-    static func fetchOne(_ db: Database, _ sql: String, arguments: StatementArguments? = nil, adapter: RowAdapter? = nil) throws -> Self?
+    static func fetchCursor(_ db: Database, sql: String, arguments: StatementArguments = StatementArguments(), adapter: RowAdapter? = nil) throws -> RecordCursor<Self>
+    static func fetchAll(_ db: Database, sql: String, arguments: StatementArguments = StatementArguments(), adapter: RowAdapter? = nil) throws -> [Self]
+    static func fetchOne(_ db: Database, sql: String, arguments: StatementArguments = StatementArguments(), adapter: RowAdapter? = nil) throws -> Self?
 }

 extension DatabaseValueConvertible {
-    static func fetchCursor(_ db: Database, _ sql: String, arguments: StatementArguments? = nil, adapter: RowAdapter? = nil) throws -> DatabaseValueCursor<Self>
-    static func fetchAll(_ db: Database, _ sql: String, arguments: StatementArguments? = nil, adapter: RowAdapter? = nil) throws -> [Self]
-    static func fetchOne(_ db: Database, _ sql: String, arguments: StatementArguments? = nil, adapter: RowAdapter? = nil) throws -> Self?
+    static func fetchCursor(_ db: Database, sql: String, arguments: StatementArguments = StatementArguments(), adapter: RowAdapter? = nil) throws -> DatabaseValueCursor<Self>
+    static func fetchAll(_ db: Database, sql: String, arguments: StatementArguments = StatementArguments(), adapter: RowAdapter? = nil) throws -> [Self]
+    static func fetchOne(_ db: Database, sql: String, arguments: StatementArguments = StatementArguments(), adapter: RowAdapter? = nil) throws -> Self?
 }
 
 extension Optional where Wrapped: DatabaseValueConvertible {
-    static func fetchCursor(_ db: Database, _ sql: String, arguments: StatementArguments? = nil, adapter: RowAdapter? = nil) throws -> NullableDatabaseValueCursor<Wrapped>
-    static func fetchAll(_ db: Database, _ sql: String, arguments: StatementArguments? = nil, adapter: RowAdapter? = nil) throws -> [Wrapped?]
+    static func fetchCursor(_ db: Database, sql: String, arguments: StatementArguments = StatementArguments(), adapter: RowAdapter? = nil) throws -> NullableDatabaseValueCursor<Wrapped>
+    static func fetchAll(_ db: Database, sql: String, arguments: StatementArguments = StatementArguments(), adapter: RowAdapter? = nil) throws -> [Wrapped?]
 }
 
 extension TableRecord {
-    static func select(sql: String, arguments: StatementArguments? = nil) -> QueryInterfaceRequest<Self>
+    static func select(sql: String, arguments: StatementArguments = StatementArguments()) -> QueryInterfaceRequest<Self>
+    static func select(literal sqlLiteral: SQLLiteral) -> QueryInterfaceRequest<Self>
-    static func select<RowDecoder>(sql: String, arguments: StatementArguments? = nil, as type: RowDecoder.Type) -> QueryInterfaceRequest<RowDecoder>
+    static func select<RowDecoder>(sql: String, arguments: StatementArguments = StatementArguments(), as type: RowDecoder.Type) -> QueryInterfaceRequest<RowDecoder>
+    static func select<RowDecoder>(literal sqlLiteral: SQLLiteral, as type: RowDecoder.Type) -> QueryInterfaceRequest<RowDecoder>
-    static func filter(sql: String, arguments: StatementArguments? = nil) -> QueryInterfaceRequest<Self>
+    static func filter(sql: String, arguments: StatementArguments = StatementArguments()) -> QueryInterfaceRequest<Self>
+    static func filter(literal sqlLiteral: SQLLiteral) -> QueryInterfaceRequest<Self>
-    static func order(sql: String, arguments: StatementArguments? = nil) -> QueryInterfaceRequest<Self>
+    static func order(sql: String, arguments: StatementArguments = StatementArguments()) -> QueryInterfaceRequest<Self>
+    static func order(literal sqlLiteral: SQLLiteral) -> QueryInterfaceRequest<Self>
 }
 
 final class FetchedRecordsController<Record: FetchableRecord> {
-    func setRequest(sql: String, arguments: StatementArguments? = nil, adapter: RowAdapter? = nil) throws
+    func setRequest(sql: String, arguments: StatementArguments = StatementArguments(), adapter: RowAdapter? = nil) throws
 }

 extension SelectionRequest {
-    func select(sql: String, arguments: StatementArguments? = nil) -> Self
+    func select(sql: String, arguments: StatementArguments = StatementArguments()) -> Self
+    func select(literal sqlLiteral: SQLLiteral) -> Self
 }
 
 extension FilteredRequest {
-    func filter(sql: String, arguments: StatementArguments? = nil) -> Self
+    func filter(sql: String, arguments: StatementArguments = StatementArguments()) -> Self
+    func filter(literal sqlLiteral: SQLLiteral) -> Self
 }
 
 extension AggregatingRequest {
-    func group(sql: String, arguments: StatementArguments? = nil) -> Self
+    func group(sql: String, arguments: StatementArguments = StatementArguments()) -> Self
+    func group(literal sqlLiteral: SQLLiteral) -> Self
-    func having(sql: String, arguments: StatementArguments? = nil) -> Self
+    func having(sql: String, arguments: StatementArguments = StatementArguments()) -> Self
+    func having(literal sqlLiteral: SQLLiteral) -> Self
 }
 
 extension OrderedRequest {
-    func order(sql: String, arguments: StatementArguments? = nil) -> Self
+    func order(sql: String, arguments: StatementArguments = StatementArguments()) -> Self
+    func order(literal sqlLiteral: SQLLiteral) -> Self
 }

 struct SQLRequest<T> : FetchRequest {
-    init(_ sql: String, arguments: StatementArguments? = nil, adapter: RowAdapter? = nil, cached: Bool = false)
+    init(sql: String, arguments: StatementArguments = StatementArguments(), adapter: RowAdapter? = nil, cached: Bool = false)
+    init(literal sqlLiteral: SQLLiteral, adapter: RowAdapter? = nil, cached: Bool = false)
 }

 struct SQLExpressionLiteral {
-    init(_ sql: String, arguments: StatementArguments? = nil)
+    init(sql: String, arguments: StatementArguments = StatementArguments())
+    init(literal sqlLiteral: SQLLiteral)
 }
```

</details>

<details>
    <summary>EncodableRecord</summary>

```diff
+protocol EncodableRecord {
+    func encode(to container: inout PersistenceContainer)
+    static var databaseEncodingUserInfo: [CodingUserInfoKey: Any] { get }
+    static func databaseJSONEncoder(for column: String) -> JSONEncoder
+    static var databaseDateEncodingStrategy: DatabaseDateEncodingStrategy { get }
+    static var databaseUUIDEncodingStrategy: DatabaseUUIDEncodingStrategy { get }
+}
+
+extension EncodableRecord where Self: Encodable {
+    func encode(to container: inout PersistenceContainer)
+}
+
+extension EncodableRecord {
+    var databaseDictionary: [String: DatabaseValue] { get }
+    func databaseEquals(_ record: Self) -> Bool
+    func databaseChanges<Record: EncodableRecord>(from record: Record) -> [String: DatabaseValue]
+}

-protocol MutablePersistableRecord: TableRecord { }
+protocol MutablePersistableRecord: EncodableRecord, TableRecord { }
```

</details>

<details>
    <summary>ValueObservation breaking changes</summary>

```diff
 enum ValueScheduling {
-    case onQueue(DispatchQueue, startImmediately: Bool)
+    case async(onQueue: DispatchQueue, startImmediately: Bool)
 }
 
 struct ValueObservation<Reducer> {
-    var extent: Database.TransactionObservationExtent
-    static func tracking(_ regions: DatabaseRegionConvertible..., reducer: Reducer) -> ValueObservation
-    static func tracking<Value>(_ regions: DatabaseRegionConvertible..., fetchDistinct fetch: @escaping (Database) throws -> Value) -> ValueObservation<DistinctUntilChangedValueReducer<RawValueReducer<Value>>> where Value: Equatable
 }
```

</details>

<details>
    <summary>Customizing pluralization and singularization</summary>

```diff
+struct Inflections {
+    init()
+    func pluralize(_ string: String) -> String
+    func singularize(_ string: String) -> String

     // Configuration
+    mutating func plural(_ pattern: String, options: NSRegularExpression.Options = [.caseInsensitive], _ template: String)
+    mutating func singular(_ pattern: String, options: NSRegularExpression.Options = [.caseInsensitive], _ template: String)
+    mutating func uncountableWords(_ words: [String])
+    mutating func irregularSuffix(_ singular: String, _ plural: String)
+}
+
+extension Inflections {
+   static var `default`: Inflections { get set }
+}
```

</details>

<details>
    <summary>Full Text Search breaking changes: support for SQLite 3.27</summary>

```diff
 struct FTS3 {
+    enum Diacritics {
+        case keep
+        case removeLegacy
+        #if GRDBCUSTOMSQLITE
+        case remove
+        #endif
+    }
 }
 
 struct FTS3TokenizerDescriptor {
-    static func unicode61(removeDiacritics: Bool = true, separators: Set<Character> = [], tokenCharacters: Set<Character> = []) -> FTS3TokenizerDescriptor
+    static func unicode61(diacritics: FTS3.Diacritics = .removeLegacy, separators: Set<Character> = [], tokenCharacters: Set<Character> = []) -> FTS3TokenizerDescriptor
 }
 
 struct FTS5 {
+    enum Diacritics {
+        case keep
+        case removeLegacy
+        #if GRDBCUSTOMSQLITE
+        case remove
+        #endif
+    }
 }
 
 struct FTS5TokenizerDescriptor {
-    static func unicode61(removeDiacritics: Bool = true, separators: Set<Character> = [], tokenCharacters: Set<Character> = []) -> FTS5TokenizerDescriptor
+    static func unicode61(diacritics: FTS5.Diacritics = .removeLegacy, separators: Set<Character> = [], tokenCharacters: Set<Character> = []) -> FTS5TokenizerDescriptor
 }
```

</details>

<details>
    <summary>SQLCipher breaking changes</summary>

```diff
 struct Configuration {
-    var cipherPageSize: Int
-    var kdfIterations: Int
 }
```

</details>

<details>
    <summary>Miscellaneous additions</summary>

**Column initializer from CodingKey**

```diff
 struct Column {
+    init(_ codingKey: CodingKey)
 }
```

**Association aggregates: support for the IFNULL sql operator**

```diff
+func ?? <RowDecoder>(lhs: AssociationAggregate<RowDecoder>, rhs: SQLExpressible) -> AssociationAggregate<RowDecoder>
```

**Remove all orderings from a request**

```diff
 protocol OrderedRequest {
+    func unordered()
 }
```

**Annotate requests with any value, not only association aggregates**

```diff
 protocol SelectionRequest {
+    annotated(with selection: [SQLSelectable]) -> Self
 }
 
 extension SelectionRequest {
+    func annotated(with selection: SQLSelectable...) -> Self
 }
 
 extension TableRecord {
+    static func annotated(with selection: [SQLSelectable]) -> QueryInterfaceRequest<Self>
+    static func annotated(with selection: SQLSelectable...) -> QueryInterfaceRequest<Self>
 }
```

**Build a DatabaseRegion from a table name**

```diff
 struct DatabaseRegion {
+    init(table: String)
 }
```

</details>

<details>
    <summary>Miscellaneous breaking changes</summary>

```diff
 enum PersistenceError: Error {
-    case recordNotFound(MutablePersistableRecord)
+    case recordNotFound(databaseTableName: String, key: [String: DatabaseValue])
 }

- class Future<Value> { }
+ class DatabaseFuture<Value> { }

 protocol FetchRequest {
-    func prepare(_ db: Database) throws -> (SelectStatement, RowAdapter?)
+    func prepare(_ db: Database, forSingleResult singleResult: Bool) throws -> (SelectStatement, RowAdapter?)
 }
 
 struct AnyFetchRequest<T> : FetchRequest {
-    init(_ prepare: @escaping (Database) throws -> (SelectStatement, RowAdapter?))
+    init(_ prepare: @escaping (Database, _ singleResult: Bool) throws -> (SelectStatement, RowAdapter?))
 }
 
-final class StatementCursor: Cursor { }
```

**Discarded deprecated methods**

```diff
 extension Cursor {
-    func flatMap<ElementOfResult>(_ transform: @escaping (Element) throws -> ElementOfResult?) -> MapCursor<FilterCursor<MapCursor<Self, ElementOfResult?>>, ElementOfResult>
 }
 
 struct DatabaseValue {
-    func losslessConvert<T>(sql: String? = nil, arguments: StatementArguments? = nil) -> T where T : DatabaseValueConvertible
-    func losslessConvert<T>(sql: String? = nil, arguments: StatementArguments? = nil) -> T? where T : DatabaseValueConvertible
 }
 
 protocol DatabaseWriter {
-    func readFromCurrentState(_ block: @escaping (Database) -> Void) throws
 }
```

</details>


## 3.7.0

Released March 9, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v3.6.2...v3.7.20)

### Fixed

- [#496](https://github.com/groue/GRDB.swift/pull/496): Fix crash when trying to perform fetchCount or ValueObservation.trackCount on joined query

### New

- [#494](https://github.com/groue/GRDB.swift/pull/494) by [@davidkraus](https://github.com/davidkraus): Document how to enable FTS5 with GRDB.swift CocoaPod
- [#497](https://github.com/groue/GRDB.swift/pull/497) by [@Marus](https://github.com/Marus): Add additional SQLCipher configuration options

### Documentation Diff

- [Advanced configuration options for SQLCipher](README.md#advanced-configuration-options-for-sqlcipher): this new chapter documents the new database encryption APIs.
- [Enabling FTS5 Support](README.md#enabling-fts5-support) has been updated with a new technique for enabling FTS5 with the GRDB.swift CocoaPod.


## 3.6.2

Released January 5, 2019 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v3.6.1...v3.6.2)

### Fixed

- [#464](https://github.com/groue/GRDB.swift/pull/464): Make updateChanges(_:with:) available to PersistableRecord structs


## 3.6.1

Released December 9, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v3.6.0...v3.6.1)

### Fixed

- [#458](https://github.com/groue/GRDB.swift/pull/458): Fix ValueObservation duration - code & doc


## 3.6.0

Released December 7, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v3.5.0...v3.6.0)

This release comes with:

- A nice sugar for updating records (my personal favorite of this release):
    
    ```swift
    // Does not hit the database if player is not modified
    try player.update(db) {
        $0.score = 1000
        $0.hasAward = true
    }
    ```
    
- Enhanced [ValueObservation](README.md#valueobservation), with methods such as `compactMap`, `combine`, ...

- Observation of specific transactions, with the new [DatabaseRegionObservation](README.md#databaseregionobservation).

- Various other improvements listed below.


### Fixed

- [#449](https://github.com/groue/GRDB.swift/pull/449): Fix JSON encoding of empty containers


### New

- [#442](https://github.com/groue/GRDB.swift/pull/442): Reindex
- [#443](https://github.com/groue/GRDB.swift/pull/443): In place record update
- [#445](https://github.com/groue/GRDB.swift/pull/445): Quality of service and target dispatch queue
- [#446](https://github.com/groue/GRDB.swift/pull/446): ValueObservation: delayed reducer creation
- [#444](https://github.com/groue/GRDB.swift/pull/444): Combine Value Observations
- [#451](https://github.com/groue/GRDB.swift/pull/451): ValueObservation.compactMap
- [#452](https://github.com/groue/GRDB.swift/pull/452): ValueObservation.mapReducer
- [#454](https://github.com/groue/GRDB.swift/pull/454): ValueObservation.distinctUntilChanged
- [#455](https://github.com/groue/GRDB.swift/pull/455): DatabaseRegionObservation
- ValueObservation methods which used to accept a variadic list of observed regions now also accept an array.
- ValueReducer, the protocol that fuels ValueObservation, is flagged [**:fire: EXPERIMENTAL**](README.md#what-are-experimental-features). It will remain so until more experience has been acquired.


### Documentation Diff

- [Record Comparison](README.md#record-comparison): this chapter has been updated for the new `updateChanges(_:with:)` method.
- [ValueObservation](README.md#valueobservation): this chapter has been updated for the new `ValueObservation.combine`, `ValueObservation.compactMap`, and `Value.distinctUntilChanged` methods.
- [DatabaseRegionObservation](README.md#databaseregionobservation): this chapter describes the new `DatabaseRegionObservation` type.


### API diff

```diff
 extension Database {
+    func reindex(collation: Database.CollationName) throws
+    func reindex(collation: DatabaseCollation) throws
 }
 
 extension MutablePersistableRecord {
+    mutating func updateChanges(_ db: Database, with change: (inout Self) throws -> Void) throws -> Bool
 }

 extension PersistableRecord {
+    func updateChanges(_ db: Database, with change: (Self) throws -> Void) throws -> Bool
 }

 struct ValueObservation<Reducer> {
+    static func tracking(
+        _ regions: [DatabaseRegionConvertible],
+        reducer: @escaping (Database) throws -> Reducer)
+        -> ValueObservation
 }
 
+extension ValueObservation where Reducer == Void {
+    static func tracking<Value>(
+        _ regions: [DatabaseRegionConvertible],
+        fetch: @escaping (Database) throws -> Value)
+        -> ValueObservation<ValueReducers.Raw<Value>>
+    static func combine<R1: ValueReducer, ...>(_ o1: ValueObservation<R1>, ...)
+        -> ValueObservation<...>
+}
 
+extension ValueObservation where Reducer: ValueReducer {
+    func compactMap<T>(_ transform: @escaping (Reducer.Value) -> T?)
+        -> ValueObservation<CompactMapValueReducer<Reducer, T>>
+}

+ extension ValueObservation where Reducer: ValueReducer, Reducer.Value: Equatable {
+     public func distinctUntilChanged()
+         -> ValueObservation<DistinctUntilChangedValueReducer<Reducer>>
+ }

+extension ValueObservation {
+    func mapReducer<R>(_ transform: @escaping (Database, Reducer) throws -> R)
+        -> ValueObservation<R>
+}
 
 struct Configuration {
+    var qos: DispatchQoS
+    var targetQueue: DispatchQueue?
 }
 
+struct DatabaseRegionObservation {
+    var extent: Database.TransactionObservationExtent
+    init(tracking regions: DatabaseRegionConvertible...)
+    init(tracking regions: [DatabaseRegionConvertible])
+    func start(in dbWriter: DatabaseWriter, onChange: @escaping (Database) -> Void) throws -> TransactionObserver
+}
```


## 3.5.0

Released November 2, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v3.4.0...v3.5.0)

This release comes with **[ValueObservation](README.md#valueobservation)**, a new type which tracks the results of database requests, and notifies fresh values whenever the database changes:

```swift
let observer = ValueObversation
    .trackingOne(Player.filter(key: 42))
    .start(in: dbQueue) { player: Player? in
        print("Player has changed")
    }
```

ValueObservation also aims at providing support for third-party code that needs to react to database changes. For example, [RxSwiftCommunity/RxGRDB#46](https://github.com/RxSwiftCommunity/RxGRDB/pull/46) is the pull request which implements RxGRDB, the companion library based on [RxSwift](https://github.com/ReactiveX/RxSwift), on top of ValueObservation.


### New

- [#435](https://github.com/groue/GRDB.swift/pull/435): Improved support for values observation
- It is now possible to observe database change from a [DatabaseReader](https://groue.github.io/GRDB.swift/docs/3.5/Protocols/DatabaseReader.html).


### Breaking Change

It used to be possible to define custom types that adopt the [DatabaseReader and DatabaseWriter protocols](README.md#databasewriter-and-databasereader-protocols), with a major drawback: it was impossible to add concurrency-related APIs to GRDB without breaking user code. Now all types that adopt those protocols are defined by GRDB: DatabaseQueue, DatabasePool, DatabaseSnapshot, AnyDatabaseReader, and AnyDatabaseWriter. **Expanding this set is no longer supported.**


### Documentation Diff

- [ValueObservation](README.md#valueobservation): this new chapter describes the new way to observe database values.


### API diff

```diff
 protocol DatabaseReader: class {
+    func add<Reducer: ValueReducer>(
+        observation: ValueObservation<Reducer>,
+        onError: ((Error) -> Void)?,
+        onChange: @escaping (Reducer.Value) -> Void)
+        throws -> TransactionObserver
+    func remove(transactionObserver: TransactionObserver)
 }
 
 protocol DatabaseWriter: DatabaseReader {
-    func remove(transactionObserver: TransactionObserver)
 }

+protocol DatabaseRegionConvertible {
+    func databaseRegion(_ db: Database) throws -> DatabaseRegion
+}
+
+extension DatabaseRegion: DatabaseRegionConvertible { }
+
+struct AnyDatabaseRegionConvertible: DatabaseRegionConvertible {
+    init(_ region: @escaping (Database) throws -> DatabaseRegion)
+    init(_ region: DatabaseRegionConvertible)
+}

-protocol FetchRequest { ... }
+protocol FetchRequest: DatabaseRegionConvertible { ... }

+enum ValueScheduling {
+    case mainQueue
+    case onQueue(DispatchQueue, startImmediately: Bool)
+    case unsafe(startImmediately: Bool)
+}

+protocol ValueReducer {
+    associatedtype Fetched
+    associatedtype Value
+    func fetch(_ db: Database) throws -> Fetched
+    mutating func value(_ fetched: Fetched) -> Value?
+}
+
+extension ValueReducer {
+    func map<T>(_ transform: @escaping (Value) -> T?) -> MapValueReducer<Self, T>
+}
+
+struct AnyValueReducer<Fetched, Value>: ValueReducer {
+    init(fetch: @escaping (Database) throws -> Fetched, value: @escaping (Fetched) -> Value?)
+    init<Reducer: ValueReducer>(_ reducer: Reducer) where Reducer.Fetched == Fetched, Reducer.Value == Value
+}

+struct ValueObservation<Reducer> {
+    var extent: Database.TransactionObservationExtent
+    var requiresWriteAccess: Bool
+    var scheduling: ValueScheduling
+    static func tracking(_ regions: DatabaseRegionConvertible..., reducer: Reducer) -> ValueObservation
+}
+
+extension ValueObservation where Reducer: ValueReducer {
+    func map<T>(_ transform: @escaping (Reducer.Value) -> T)
+        -> ValueObservation<MapValueReducer<Reducer, T>>
+    func start(
+        in reader: DatabaseReader,
+        onError: ((Error) -> Void)? = nil,
+        onChange: @escaping (Reducer.Value) -> Void) throws -> TransactionObserver
+}
+
+extension ValueObservation where Reducer == Void {
+    static func tracking<Value>(
+        _ regions: DatabaseRegionConvertible...,
+        fetch: @escaping (Database) throws -> Value)
+        -> ValueObservation<ValueReducers.Raw<Value>>
+
+    static func tracking<Value>(
+        _ regions: DatabaseRegionConvertible...,
+        fetchDistinct: @escaping (Database) throws -> Value)
+        -> ValueObservation<ValueReducers.Distinct<Value>>
+        where Value: Equatable
+
+    static func trackingCount<Request: FetchRequest>(_ request: Request)
+        -> ValueObservation<ValueReducers.Raw<Int>>
+    static func trackingAll<Request: FetchRequest>(_ request: Request)
+        -> ValueObservation<ValueReducers.Raw<[Request.RowDecoder]>>
+    static func trackingOne<Request: FetchRequest>(_ request: Request)
+        -> ValueObservation<ValueReducers.Raw<Request.RowDecoder?>>
+}
```


## 3.4.0

Released October 8, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v3.3.1...v3.4.0)

This release comes with **Association Aggregates**. They let you compute values out of collections of associated records, such as their count, or the maximum value of an associated record column.

### Fixed

- [#425](https://github.com/groue/GRDB.swift/pull/425): Fix "destination database is in use " error during database backup
- [#427](https://github.com/groue/GRDB.swift/pull/427): Have cursors reset SQLite statements in deinit


### New

- [#422](https://github.com/groue/GRDB.swift/pull/422): Refining Association Requests
- [#423](https://github.com/groue/GRDB.swift/pull/423): Association Aggregates
- [#428](https://github.com/groue/GRDB.swift/pull/428): Upgrade custom SQLite builds to version 3.25.2 (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib))


### Documentation Diff

- [Refining Association Requests](Documentation/AssociationsBasics.md#refining-association-requests): this new chapter describes how you can craft complex associated requests in a modular way.
- [Association Aggregates](Documentation/AssociationsBasics.md#association-aggregates): this chapter describes the main new feature of this release.



### API diff

```diff
 protocol AggregatingRequest {
-    func group(_ expressions: [SQLExpressible]) -> Self
+    func group(_ expressions: @escaping (Database) throws -> [SQLExpressible]) -> Self
 }

+extension AggregatingRequest {
+    func group(_ expressions: [SQLExpressible]) -> Self
+}

+extension TableRequest where Self: AggregatingRequest {
+    func groupByPrimaryKey() -> Self {
+}

+struct AssociationAggregate<RowDecoder> {
+    func aliased(_ name: String) -> AssociationAggregate<RowDecoder>
+    func aliased(_ key: CodingKey) -> AssociationAggregate<RowDecoder>
+}

+extension HasManyAssociation where Origin: TableRecord, Destination: TableRecord {
+    var count: AssociationAggregate<Origin>
+    var isEmpty: AssociationAggregate<Origin>
+    func average(_ expression: SQLExpressible) -> AssociationAggregate<Origin>
+    func max(_ expression: SQLExpressible) -> AssociationAggregate<Origin>
+    func min(_ expression: SQLExpressible) -> AssociationAggregate<Origin>
+    func sum(_ expression: SQLExpressible) -> AssociationAggregate<Origin>
+}

+extension QueryInterfaceRequest {
+    func annotated(with selection: [SQLSelectable]) -> QueryInterfaceRequest<RowDecoder>
+}

+extension QueryInterfaceRequest where RowDecoder: TableRecord {
+    func annotated(with aggregates: AssociationAggregate<RowDecoder>...) -> QueryInterfaceRequest<RowDecoder>
+    func annotated(with aggregates: [AssociationAggregate<RowDecoder>]) -> QueryInterfaceRequest<RowDecoder>
+    func having(_ aggregate: AssociationAggregate<RowDecoder>) -> QueryInterfaceRequest<RowDecoder>
+}

+extension TableRecord {
+    static func annotated(with aggregates: AssociationAggregate<Self>...) -> QueryInterfaceRequest<Self>
+    static func annotated(with aggregates: [AssociationAggregate<Self>]) -> QueryInterfaceRequest<Self>
+    static func having(_ aggregate: AssociationAggregate<Self>) -> QueryInterfaceRequest<Self>
+}

+extension SQLSpecificExpressible {
+    func aliased(_ key: CodingKey) -> SQLSelectable
+}
```


## 3.3.1

Released September 23, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v3.3.0...v3.3.1)

### Fixed

- [#414](https://github.com/groue/GRDB.swift/pull/414): Fix database pool use of FTS5 tokenizers

### Documentation Diff

- Enhanced visibility of the [Demo Application](Documentation/DemoApps/GRDBDemoiOS)


## 3.3.0

Released September 16, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v3.3.0-beta1...v3.3.0)

### New

- [#409](https://github.com/groue/GRDB.swift/pull/409): DatabaseWriter.concurrentRead


### Documentation Diff

- [Advanced DatabasePool](README.md#advanced-databasepool): the chapter has been updated for the new DatabasePool.concurrentRead method.


### API diff

```diff
 protocol DatabaseWriter : DatabaseReader {
+    func concurrentRead<T>(_ block: @escaping (Database) throws -> T) -> Future<T>
+    @available(*, deprecated)
     func readFromCurrentState(_ block: @escaping (Database) -> Void) throws
 }

+class Future<Value> {
+    func wait() throws -> Value
+}

 extension Cursor {
+    func isEmpty() throws -> Bool
 }
```


## 3.3.0-beta1

Released September 5, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v3.2.0...v3.3.0-beta1)

This release focuses on enhancing the relationships between [Codable records](README.md#codable-records) and the database, with JSON columns, customized date formats, and better diagnostics when things go wrong.

Other notable enhancements are:

- Support for Swift 4.2 and Xcode 10 (Xcode 9.3 is still supported).
- Support for the FTS5 full-text engine when available in the operating system (iOS 11.4+ / macOS 10.13+ / watchOS 4.3+).


### Fixed

- The `write` and `unsafeReentrantRead` DatabaseQueue methods used to have an incorrect `throws/rethrows` qualifier.


### New

- [#397](https://github.com/groue/GRDB.swift/pull/397) by [@gusrota](https://github.com/gusrota) and [@valexa](https://github.com/valexa): Codable records: JSON encoding and decoding of codable record properties
- [#399](https://github.com/groue/GRDB.swift/pull/399): Codable records: customize the `userInfo` context dictionary, and the format of JSON columns
- [#403](https://github.com/groue/GRDB.swift/pull/403): Codable records: customize date and uuid format
- [#401](https://github.com/groue/GRDB.swift/pull/401): Query Interface: set the selection and the fetched type in a single method call
- [#393](https://github.com/groue/GRDB.swift/pull/393) by [@Marus](https://github.com/Marus): Upgrade SQLCipher to 3.4.2, enable FTS5 on GRDBCipher and new pod GRDBPlus.
- [#384](https://github.com/groue/GRDB.swift/pull/384): Improve database value decoding diagnostics
- [#396](https://github.com/groue/GRDB.swift/pull/396): Support for Xcode 10 and Swift 4.2
- Cursors of optimized values (Strint, Int, Date, etc.) have been renamed: FastDatabaseValueCursor and FastNullableDatabaseValueCursor replace the deprecated ColumnCursor and NullableColumnCursor.


### Documentation Diff

- [Enabling FTS5 Support](README.md#enabling-fts5-support): Procedure for enabling FTS5 support in GRDB.
- [Codable Records](README.md#codable-records): Updated documentation for JSON columns, customized date and uuid formats, and other customization options.
- [Record Customization Options](README.md#record-customization-options): A new chapter that gathers all your customization options.
- [Fetching from Requests](README.md#fetching-from-requests): Enhanced documentation about requests that don't fetch their origin record (such as aggregates, or associated records).
- [DatabaseRegion](README.md#databaseregion): Database regions help you observe the database.


### API diff

Fixes:

```diff
 class DatabaseQueue {
-    func write<T>(_ block: (Database) throws -> T) rethrows -> T {
+    func write<T>(_ block: (Database) throws -> T) throws -> T {
-    func unsafeReentrantRead<T>(_ block: (Database) throws -> T) throws -> T {
+    func unsafeReentrantRead<T>(_ block: (Database) throws -> T) rethrows -> T {
 }
```

Enhancements to Codable support:

```diff
 protocol FetchableRecord {
+    static var databaseDecodingUserInfo: [CodingUserInfoKey: Any] { get }
+    static var databaseDateDecodingStrategy: DatabaseDateDecodingStrategy { get }
+    static func databaseJSONDecoder(for column: String) -> JSONDecoder
 }

 protocol MutablePersistableRecord: TableRecord {
+    static var databaseEncodingUserInfo: [CodingUserInfoKey: Any] { get }
+    static var databaseDateEncodingStrategy: DatabaseDateEncodingStrategy { get }
+    static var databaseUUIDEncodingStrategy: DatabaseUUIDEncodingStrategy { get }
+    static func databaseJSONEncoder(for column: String) -> JSONEncoder
 }
```

Query Interface: set the selection and the fetched type in a single method call:

```diff
 extension QueryInterfaceRequest {
+    func select<RowDecoder>(_ selection: [SQLSelectable], as type: RowDecoder.Type) -> QueryInterfaceRequest<RowDecoder>
+    func select<RowDecoder>(_ selection: SQLSelectable..., as type: RowDecoder.Type) -> QueryInterfaceRequest<RowDecoder>
+    func select<RowDecoder>(sql: String, arguments: StatementArguments? = nil, as type: RowDecoder.Type) -> QueryInterfaceRequest<RowDecoder>
 }
 
 extension TableRecord {
+    static func select<RowDecoder>(_ selection: [SQLSelectable], as type: RowDecoder.Type) -> QueryInterfaceRequest<RowDecoder>
+    static func select<RowDecoder>(_ selection: SQLSelectable..., as type: RowDecoder.Type) -> QueryInterfaceRequest<RowDecoder>
+    static func select<RowDecoder>(sql: String, arguments: StatementArguments? = nil, as type: RowDecoder.Type) -> QueryInterfaceRequest<RowDecoder>
 }
```

Deprecations:

```diff
+final class FastDatabaseValueCursor<Value: DatabaseValueConvertible & StatementColumnConvertible> : Cursor { }
+@available(*, deprecated, renamed: "FastDatabaseValueCursor")
+typealias ColumnCursor<Value: DatabaseValueConvertible & StatementColumnConvertible> = FastDatabaseValueCursor<Value>

+final class FastNullableDatabaseValueCursor<Value: DatabaseValueConvertible & StatementColumnConvertible> : Cursor { }
+@available(*, deprecated, renamed: "FastNullableDatabaseValueCursor")
+typealias NullableColumnCursor<Value: DatabaseValueConvertible & StatementColumnConvertible> = FastNullableDatabaseValueCursor<Value>
```


## 3.2.0

Released July 8, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v3.1.0...v3.2.0)

### New

- [#381](https://github.com/groue/GRDB.swift/pull/381): Nuking db during development

### Documentation Diff

- [The `eraseDatabaseOnSchemaChange` Option](README.md#the-erasedatabaseonschemachange-option): See how a DatabaseMigrator can automatically recreate the whole database when a migration has changed its definition.

### API diff

```diff
 struct DatabaseMigrator {
+    var eraseDatabaseOnSchemaChange: Bool
 }
 
 extension DatabaseWriter {
+    func erase() throws
+    func vacuum() throws
 }
```

## 3.1.0

Released June 17, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v3.0.0...v3.1.0)

### New

- [#371](https://github.com/groue/GRDB.swift/pull/371): Database can have a label.
- [#372](https://github.com/groue/GRDB.swift/pull/372): Upgrade custom SQLite builds to 3.24.0.


## 3.0.0

Released June 7, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.10.0...v3.0.0)

GRDB 3 is a release focused on **modernization**, **safety**, and **associations between record types**.

It comes with new features, but also a few breaking changes, and a set of updated good practices. The [GRDB 2 Migration Guide](Documentation/GRDB2MigrationGuide.md) will help you upgrading your applications.


### New

- Associations and Joins ([#319](https://github.com/groue/GRDB.swift/pull/319)).
- Enhancements to logical operators ([#336](https://github.com/groue/GRDB.swift/pull/336)).
- Foster auto-incremented primary keys ([#337](https://github.com/groue/GRDB.swift/pull/337)).
- ColumnExpression Protocol ([#340](https://github.com/groue/GRDB.swift/pull/340)).
- Improved parsing of dates and date components ([#334](https://github.com/groue/GRDB.swift/pull/334) by @sobri909).
- Common API for requests and associations derivation ([#347](https://github.com/groue/GRDB.swift/pull/347)).
- `DatabaseMigrator.appliedMigrations(in:)` returns the set of applied migrations identifiers in a database ([#321](https://github.com/groue/GRDB.swift/pull/321)).
- `Database.isSQLiteInternalTable(_:)` returns whether a table name is an internal SQLite table ([#321](https://github.com/groue/GRDB.swift/pull/321)).
- `Database.isGRDBInternalTable(_:)` returns whether a table name is an internal GRDB table ([#321](https://github.com/groue/GRDB.swift/pull/321)).
- Upgrade custom SQLite builds to [v3.23.0](https://www.sqlite.org/changes.html) (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib)).
- Improve Row descriptions ([#331](https://github.com/groue/GRDB.swift/pull/331)).
- Request derivation protocols ([#329](https://github.com/groue/GRDB.swift/pull/329)).
- Preliminary Linux support for the main framework ([#354](https://github.com/groue/GRDB.swift/pull/354)).
- Automatic table name generation ([#355](https://github.com/groue/GRDB.swift/pull/355)).
- Delayed Request Ordering ([#365](https://github.com/groue/GRDB.swift/pull/365)).


### Breaking Changes

- Swift 4.1 is now required.
- iOS 8 sunsetting: GRDB 3 is only tested on iOS 9+, due to a limitation in Xcode 9.3. Code that targets older versions of SQLite and iOS is still there, but is not supported.
- The Record protocols have been renamed: `RowConvertible` to `FetchableRecord`, `Persistable` to `PersistableRecord`, and `TableMapping` to `TableRecord` ([#314](https://github.com/groue/GRDB.swift/pull/314)).
- Implicit transaction in DatabasePool.write and DatabaseQueue.write ([#332](https://github.com/groue/GRDB.swift/pull/332)).
- `Request` and `TypedRequest` protocols have been merged into `FetchRequest` ([#311](https://github.com/groue/GRDB.swift/pull/311), [#328](https://github.com/groue/GRDB.swift/pull/328), [#348](https://github.com/groue/GRDB.swift/pull/348)).
- Reversing unordered requests has no effect ([#342](https://github.com/groue/GRDB.swift/pull/342)).
- The `IteratorCursor` type has been removed. Use `AnyCursor` instead ([#312](https://github.com/groue/GRDB.swift/pull/312)).
- Row scopes collection, breadth-first scope search ([#335](https://github.com/groue/GRDB.swift/pull/335)).
- Expressions are no longer PATs ([#330](https://github.com/groue/GRDB.swift/pull/330)).
- Deprecated APIs have been removed.


### Documentation Diff

- [Associations](Documentation/AssociationsBasics.md): Discover the major GRDB 3 feature
- [Database Queues](README.md#database-queues): focus on the `read` and `write` methods.
- [Database Pools](README.md#database-pools): focus on the `read` and `write` methods.
- [Transactions and Savepoints](README.md#transactions-and-savepoints): the chapter has been rewritten in order to introduce transactions as a power-user feature.
- [ScopeAdapter](README.md#scopeadapter): do you use row adapters? If so, have a look.
- [TableRecord Protocol](README.md#tablerecord-protocol): updated for the new automatic generation of database table name.
- [Examples of Record Definitions](README.md#examples-of-record-definitions): this new chapter provides a handy reference of the three main ways to define record types (Codable, plain struct, Record subclass).
- [SQL Operators](README.md#sql-operators): the chapter introduces the new `joined(operator:)` method that lets you join a chain of expressions with `AND` or `OR` without nesting: `[cond1, cond2, ...].joined(operator: .and)`.
- [Custom Requests](README.md#custom-requests): the old `Request` and `TypedRequest` protocols have been replaced with `FetchRequest`. If you want to know more about custom requests, check this chapter.
- [Customized Decoding of Database Rows](README.md#customized-decoding-of-database-rows): learn how to escape the ready-made `FetchableRecord` protocol when it does not fit your needs.
- [Migrations](README.md#migrations): learn how to check if a migration has been applied (very useful for migration tests).


## 2.10.0

Released March 30, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.9.0...v2.10.0)

### New

- Support for Swift 4.1 and Xcode 9.3
- Added `Cursor.compactMap` ([SE-0187](https://github.com/apple/swift-evolution/blob/master/proposals/0187-introduce-filtermap.md))

### Deprecated

- `Cursor.flatMap` is deprecated. Use `compactMap` instead.


## 2.9.0

Released February 25, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.8.0...v2.9.0)

### New

- **Changes tracking overhaul**: changes tracking, a feature previously restricted to the `Record` class and its subclasses, is now available for all records. And it has a better looking API ([documentation](https://github.com/groue/GRDB.swift/blob/master/README.md#changes-tracking)).
- **Database snapshots**: Database pools can now take database snapshots. A snapshot sees an unchanging database content, as it existed at the moment the snapshot was created ([documentation](https://github.com/groue/GRDB.swift/blob/master/README.md#database-snapshots)).
- **Improved support for joined queries**: more than a set on new APIs, we provide a set of guidelines that will help you deal with your wildest joined queries. Check the new [Joined Queries Support](https://github.com/groue/GRDB.swift/blob/master/README.md#joined-queries-support) documentation chapter.
- `Database.columns(in:)` returns information about the columns of a table.
- `Request.adapted(_:)` is no longer experimental.
- `Configuration.allowsUnsafeTransactions` lets you leave transactions opened between two database accesses (see below).
- Support for explicit transaction management, via the new `Database.beginTransaction`, `commit`, and `rollback` methods.


### Fixed

- It is now a programmer error to leave a transaction opened at the end of a database access block:
    
    ```swift
    // Fatal error: A transaction has been left opened at the end of a database access
    try dbQueue.inDatabase { db in
        try db.beginTransaction()
    }
    ```
    
    One can still opt-in for the unsafe behavior by setting the new `allowsUnsafeTransactions` configuration flag:
    
    ```swift
    var config = Configuration()
    config.allowsUnsafeTransactions = true
    let dbQueue = DatabaseQueue(configuration: config)
    
    // OK
    try dbQueue.inDatabase { db in
        try db.beginTransaction()
    }
    ```


### Deprecated

- `Database.columnCount(in:)` is deprecated. Use `db.columns(in:).count` instead.
- `RecordBox`, introduced in [2.7.0](#270), was ill-advised. It has been deprecated. Use [changes tracking](https://github.com/groue/GRDB.swift/blob/master/README.md#changes-tracking) methods on the Persistable protocol instead.
- `Record.hasPersistentChangedValues` has been deprecated, renamed `hasDatabaseChanges`.
- `Record.persistentChangedValues` has been deprecated, renamed `databaseChanges`.


### Documentation Diff

- The [Changes Tracking](https://github.com/groue/GRDB.swift/blob/master/README.md#changes-tracking) chapter has been updated for the new universal support for record changes.
- A new [Database Snapshots](https://github.com/groue/GRDB.swift/blob/master/README.md#database-snapshots) chapter has been added.
- The [Concurrency](https://github.com/groue/GRDB.swift/blob/master/README.md#concurrency) chapter has been updated for database snapshots.
- A new [Differences between Database Queues and Pools](https://github.com/groue/GRDB.swift/blob/master/README.md#differences-between-database-queues-and-pools) chapter has been added, that attempts at visually show how much database pools are different from database queues.
- A new [Joined Queries Support](https://github.com/groue/GRDB.swift/blob/master/README.md#joined-queries-support) chapter has been added.
- The [Row Adapters](https://github.com/groue/GRDB.swift/blob/master/README.md#row-adapters) chapter has been made consistent with the new chapter on joined queries.
- The [Codable Records](https://github.com/groue/GRDB.swift/blob/master/README.md#codable-records) chapter has been made consistent with the new chapter on joined queries.
- The [Database Schema Introspection](https://github.com/groue/GRDB.swift/blob/master/README.md#database-schema-introspection) has been updated for `Database.columns(in:)`


### API diff

```diff
+struct ColumnInfo {
+    let name: String
+    let type: String
+    let isNotNull: Bool
+    let defaultValueSQL: String?
+    let primaryKeyIndex: Int
+}

 struct Configuration {
+    var allowsUnsafeTransactions: Bool
 }
 
 class Database {
+     @available(*, deprecated, message: "Use db.columns(in: tableName).count instead")
      func columnCount(in tableName: String) throws -> Int
+     func columns(in tableName: String) throws -> [ColumnInfo]
+     func beginTransaction(_ kind: TransactionKind? = nil) throws
+     func rollback() throws
+     func commit() throws
 }
 
 class DatabasePool {
+    func makeSnapshot() throws -> DatabaseSnapshot
 }
 
+class DatabaseSnapshot: DatabaseReader { }

 extension MutablePersistable {
+    @discardableResult
+    func updateChanges(_ db: Database, from record: MutablePersistable) throws -> Bool
+    func databaseEqual(_ record: Self) -> Bool
+    func databaseChanges(from record: MutablePersistable) -> [String: DatabaseValue]
 }
 class Record {
-    final func updateChanges(_ db: Database) throws
+    @discardableResult
+    final func updateChanges(_ db: Database) throws -> Bool
 }
 
+@available(*, deprecated, message: "Prefer changes methods defined on the MutablePersistable protocol: databaseEqual(_:), databaseChanges(from:), updateChanges(from:)")
 class RecordBox: Record { }

 class Row {
+    var unscoped: Row
+    var containsNonNullValue: Bool
+    func hasNull(atIndex index: Int) -> Bool
+    subscript<Record: RowConvertible>(_ scope: String) -> Record
+    subscript<Record: RowConvertible>(_ scope: String) -> Record?
 }

 extension TableMapping {
+    static func selectionSQL(alias: String? = nil) -> String
+    static func numberOfSelectedColumns(_ db: Database) throws -> Int
 }

+struct EmptyRowAdapter: RowAdapter { }

 struct ScopeAdapter {
+    init(base: RowAdapter, scopes: [String: RowAdapter])
 }

+func splittingRowAdapters(columnCounts: [Int]) -> [RowAdapter]
```


## 2.8.0

Released January 29, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.7.0...v2.8.0)

**New**

- Upgrade custom SQLite builds to [v3.22.0](https://www.sqlite.org/changes.html) (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib)).
- The FTS5 full-text search engine has been enhanced with [initial token queries](https://sqlite.org/fts5.html#carrotq), and FTS5Pattern has gained a new initializer: `FTS5Pattern(matchingPrefixPhrase:)`
- The `Cursor` protocol is extended with more methods inspired by the standard Sequence protocol: `drop(while:)`, `dropFirst()`, `dropFirst(_:)`, `dropLast()`, `dropLast(_:)`, `joined(separator:)`, `prefix(_:)`, `max()`, `max(by:)`, `min()`, `min(by:)`, `prefix(while:)`, `reduce(into:_:)`, `suffix(_:)`, 


## 2.7.0

Released January 21, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.6.1...v2.7.0)

**New**

- The new RecordBox class brings changes tracking to any record type ([documentation](https://github.com/groue/GRDB.swift/blob/master/README.md#recordbox-class)):
    
    ```swift
    // A regular record struct
    struct Player: RowConvertible, MutablePersistable { ... }
    
    try dbQueue.inDatabase { db in
        // Fetch a boxed player
        if let boxedPlayer = try RecordBox<Player>.fetchOne(db, key: 1) {
            // boxedPlayer.value is Player
            boxedPlayer.value.score = 300
            
            if boxedPlayer.hasPersistentChangedValues {
                print("player has been modified")
            }
            
            // Does nothing if player has not been modified:
            try boxedPlayer.updateChanges(db)
        }
    }
    ```


## 2.6.1

Released January 19, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.6.0...v2.6.1)

**Fixed**

- Fixed a crash that could happen when a transaction observer uses the `stopObservingDatabaseChangesUntilNextTransaction()` method.


## 2.6.0

Released January 18, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.5.0...v2.6.0)

### New

- Database observation has been enhanced:
    
    - `TransactionObserver.stopObservingDatabaseChangesUntilNextTransaction()` allows transaction observers to stop observing the database for the remaining extent of a transaction.
    - GRDB no longer prevents the [truncate optimization](https://www.sqlite.org/lang_delete.html#truncateopt) when no transaction observers are interested in deleted rows.
    - FetchedRecordsController now avoids checking for changes in untracked rowIds.
    - `DatabaseRegion` is a new public type that helps transaction observers recognize impactful database changes. This type is not documented in the main documentation. For more information, see [DatabaseRegion reference](https://groue.github.io/GRDB.swift/docs/2.6/Structs/DatabaseRegion.html), and look at [FetchedRecordsController implementation](https://github.com/groue/GRDB.swift/blob/master/GRDB/Record/FetchedRecordsController.swift).
    - `TransactionObserver` protocol provides default implementations for rarely used callbacks.
    
- `Row` adopts RandomAccessCollection

### API diff

```diff
 extension TransactionObserver {
+    func stopObservingDatabaseChangesUntilNextTransaction()
+
+    // Default implementation
+    func databaseWillCommit() throws
+
+    #if SQLITE_ENABLE_PREUPDATE_HOOK
+    // Default implementation
+    func databaseWillChange(with event: DatabasePreUpdateEvent)
+    #endif
 }

+struct DatabaseRegion: Equatable {
+    var isEmpty: Bool
+
+    init()
+
+    func union(_ other: DatabaseRegion) -> DatabaseRegion
+    mutating func formUnion(_ other: DatabaseRegion)
+
+    func isModified(byEventsOfKind eventKind: DatabaseEventKind) -> Bool
+    func isModified(by event: DatabaseEvent) -> Bool
+}

 class SelectStatement {
+    var fetchedRegion: DatabaseRegion
+
+    @available(*, deprecated, renamed:"DatabaseRegion")
+    typealias SelectionInfo = DatabaseRegion
+    
+    @available(*, deprecated, renamed:"fetchedRegion")
+    var selectionInfo: DatabaseRegion
 }

 enum DatabaseEventKind {
-    func impacts(_ selectionInfo: SelectStatement.SelectionInfo) -> Bool
+    @available(*, deprecated, message: "Use DatabaseRegion.isModified(byEventsOfKind:) instead")
+    func impacts(_ region: DatabaseRegion) -> Bool
 }
 
 protocol Request {
+    // Default implementation
+    func fetchedRegion(_ db: Database) throws -> DatabaseRegion
 }
 
+extension Row: RandomAccessCollection {
+}
+extension RowIndex: Strideable {
}
```


## 2.5.0

Released January 11, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.4.2...v2.5.0)

### Fixed

- [Transaction observers](https://github.com/groue/GRDB.swift/blob/master/README.md#transactionobserver-protocol) used to be notified of some database changes they were not interested into, in case of complex statements with side effects (foreign key cascades or sql triggers). This has been fixed.


### New

- The query interface has learned to build requests from any key (primary keys and unique keys) ([documentation](https://github.com/groue/GRDB.swift/blob/master/README.md#fetching-by-key)):
    
    ```swift
    // SELECT * FROM players WHERE id = 1
    let request = Player.filter(key: 1)
    let player = try request.fetchOne(db)    // Player?
    
    // SELECT * FROM countries WHERE isoCode IN ('FR', 'US')
    let request = Country.filter(keys: ["FR", "US"])
    let countries = try request.fetchAll(db) // [Country]
    
    // SELECT * FROM players WHERE email = 'arthur@example.com'
    let request = Player.filter(key: ["email": "arthur@example.com"])
    let player = try request.fetchOne(db)    // Player?
    ```
    
    This feature has been introduced in order to ease the use of [RxGRDB](https://github.com/RxSwiftCommunity/RxGRDB):
    
    ```swift
    // New
    Player.filter(key: 1).rx
        .fetchOne(in: dbQueue)
        .subscribe(onNext: { player: Player? in
            print("Player 1 has changed")
        })
    ```


### API diff

```diff
 extension TableMapping {
+    static func filter<PrimaryKeyType: DatabaseValueConvertible>(key: PrimaryKeyType?) -> QueryInterfaceRequest<Self>
+    static func filter<Sequence: Swift.Sequence>(keys: Sequence) -> QueryInterfaceRequest<Self> where Sequence.Element: DatabaseValueConvertible
+    static func filter(key: [String: DatabaseValueConvertible?]?) -> QueryInterfaceRequest<Self>
+    static func filter(keys: [[String: DatabaseValueConvertible?]]) -> QueryInterfaceRequest<Self>
 }
 
 extension QueryInterfaceRequest where T: TableMapping {
+    func filter<PrimaryKeyType: DatabaseValueConvertible>(key: PrimaryKeyType?) -> QueryInterfaceRequest<T>
+    func filter<Sequence: Swift.Sequence>(keys: Sequence) -> QueryInterfaceRequest<T> where Sequence.Element: DatabaseValueConvertible
+    func filter(key: [String: DatabaseValueConvertible?]?) -> QueryInterfaceRequest<T>
+    func filter(keys: [[String: DatabaseValueConvertible?]]) -> QueryInterfaceRequest<T>
 }
 
 extension RowConvertible where Self: TableMapping {
-    static func fetchOne(_ db: Database, key: [String: DatabaseValueConvertible?]) throws -> Self?
+    static func fetchOne(_ db: Database, key: [String: DatabaseValueConvertible?]?) throws -> Self?
 }
```


## 2.4.2

Released January 6, 2018 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.4.1...v2.4.2)

**Fixed**

- When using a database pool, the schema introspection methods could return wrong values whenever the database schema was concurrently read and modified. This has been fixed.
- `DatabasePool.readFromCurrentState` no longer accepts to spawn a reader when a transaction is currently opened on the writer connection.


## 2.4.1

Released December 16, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.4.0...v2.4.1)

**Fixed**

- [#284](https://github.com/groue/GRDB.swift/pull/284): fixes a misuse of the sqlite3_config() function when configuring the global SQLite [Error Log](https://github.com/groue/GRDB.swift/blob/master/README.md#error-log)


## 2.4.0

Released December 3, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.3.1...v2.4.0)

**New**

- [#280](https://github.com/groue/GRDB.swift/pull/280): It is now possible to add an untyped column to an existing table.
    
    ```swift
    try db.alter(table: "players") { t in
        t.add(column: "score")
    }
    ```

- [#281](https://github.com/groue/GRDB.swift/pull/281): The `Database.dropFTS4SynchronizationTriggers` & `Database.dropFTS5SynchronizationTriggers` method help cleaning up synchronized full-text table ([documentation](https://github.com/groue/GRDB.swift/blob/master/README.md#deleting-synchronized-full-text-tables))

**Breaking Change**

- [#282](https://github.com/groue/GRDB.swift/issues/282): This version comes with a breaking change that affects users who manually embed the GRDBCipher and GRDBCustom frameworks in their projects. This change does not affect users of the GRDB framework, or users of GRDBCipher through CocoaPods. Now, instead of embedding the GRDB.xcodeproj project, you have to embed the GRDBCipher.xcodeproj or  GRDBCustom.xcodeproj. Please have a look at the updated [Encryption](https://github.com/groue/GRDB.swift/blob/master/README.md#encryption) and [Custom SQLite Builds](https://github.com/groue/GRDB.swift/blob/master/Documentation/CustomSQLiteBuilds.md) documentation chapters.


## 2.3.1

Released November 8, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.3.0...v2.3.1)

**Fixed**

- GRDB 2.2.0 has introduced a fix in the way [transaction observers](https://github.com/groue/GRDB.swift/blob/master/README.md#transactionobserver-protocol) are notified of empty deferred transactions (`BEGIN; COMMIT;`). That fix was incomplete, and inconsistent.
    
    Now all transactions are notified, without any exception, including:
    
    ```swift
    try db.execute("BEGIN; COMMIT;")
    try db.execute("SAVEPOINT foo; RELEASE SAVEPOINT foo;")
    ```
    
    [Rationale](https://github.com/groue/GRDB.swift/commit/820bc87cfeee701743da852f3634e2c695e911ee#diff-3e791e9db648cd302590c9b86c70757fR376)


## 2.3.0

Released November 5, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.2.0...v2.3.0)

**New**

- Upgrade custom SQLite builds to [v3.21.0](https://www.sqlite.org/changes.html) (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib)).


## 2.2.0

Released October 31, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.1.0...v2.2.0)

**New**

- `Database.viewExists(_:)` returns whether a view exists in the database.
- `Database.triggerExists(_:)` returns whether a trigger exists in the database.

**Fixed**

- `DROP VIEW` statements would not drop views ([#267](https://github.com/groue/GRDB.swift/issues/267))
- GRDB used to incorrectly send incomplete transaction notifications to [transaction observers](https://github.com/groue/GRDB.swift/blob/master/README.md#transactionobserver-protocol) in the case of empty deferred transactions. This is no longer the case. Since empty deferred transactions have SQLite consider that no transaction started at all, they are no longer notified to transaction observers:

    ```sql
    -- Nothing happens, and thus no notification is sent
    BEGIN TRANSACTION
    COMMIT
    ```
    
    Those empty deferred transactions still count for the [afterNextTransactionCommit](https://github.com/groue/GRDB.swift/blob/master/README.md#after-commit-hook) database method, and the `.nextTransaction` [observation extent](https://github.com/groue/GRDB.swift/blob/master/README.md#observation-extent).


## 2.1.0

Released October 24, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.0.3...v2.1.0)

### New

- GRDBCipher can now build from command line ([groue/sqlcipher/pull/1](https://github.com/groue/sqlcipher/pull/1) by  [Darren Clark](https://github.com/darrenclark))
- Upgrade custom SQLite builds to [v3.20.1](https://www.sqlite.org/changes.html) (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib)).
- The new method `Request.asSQLRequest` allows to inspect the sql and arguments of any request:
    
    ```swift
    let request = Player.all()
    let sql = try request.asSQLRequest(db).sql
    print(sql) // Prints "SELECT * FROM players"
    ```
    
- StatementArguments adopts Equatable


### Fixed

- `DROP TABLE` statements would not drop temporary tables.


### Documentation Diff

- New FAQ: [How do I create a database in my application?](https://github.com/groue/GRDB.swift/blob/master/README.md#how-do-i-create-a-database-in-my-application)
- New FAQ: [How do I print a request as SQL?](https://github.com/groue/GRDB.swift/blob/master/README.md#how-do-i-print-a-request-as-sql)
- The [Codable Record](https://github.com/groue/GRDB.swift/blob/master/README.md#codable-records) chapter has been enhanced with more information and sample code.


### API diff

```diff
 extension Request {
+    func asSQLRequest(_ db: Database, cached: Bool = false) throws -> SQLRequest
}
struct SQLRequest {
+    let sql: String
+    let arguments: StatementArguments?
+    let adapter: RowAdapter?
 }
```


## 2.0.3

Released October 9, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.0.2...v2.0.3)

**Fixed**: Record types that conform to Encodable now encode their null columns.


## 2.0.2

Released October 5, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.0.1...v2.0.2)

**Fixed**: `DROP TABLE` statements would not drop tables when run through a prepared statement.


## 2.0.1

Released September 17, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v2.0...v2.0.1)

**Fixed**: restored support for Swift Package Manager


## 2.0.0

Released September 16, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v1.3.0...v2.0)

**GRDB 2.0 brings support for Swift 4.** Notable changes are:

- **Use subscript notation when extracting row values** ([documentation](https://github.com/groue/GRDB.swift#column-values)):
    
    ```swift
    let name: String = row[0]              // 0 is the leftmost column
    let name: String = row["name"]         // Leftmost matching column - lookup is case-insensitive
    let name: String = row[Column("name")] // Using query interface's Column
    ```

- **Support for the `Codable` protocol** ([documentation](https://github.com/groue/GRDB.swift#codable-records))
    
    Record types that adopt the standard `Codable` protocol are granted with automatic adoption of GRDB record protocols. This means that you no longer have to write boilerplate code :tada::
    
    ```swift
    struct Player : RowConvertible, Persistable, Codable {
        static let databaseTableName = "players"
        let name: String
        let score: Int
    }
    
    // Automatically derived:
    //
    // extension Player {
    //     init(row: Row) {
    //         name = row["name"]
    //         score = row["score"]
    //     }
    //     
    //     func encode(to container: inout PersistenceContainer) {
    //         container["name"] = name
    //         container["score"] = score
    //     }
    // }
    
    try dbQueue.inDatabase { db in
        let arthur = Player(name: "Arthur", score: 100)
        try arthur.insert(db)
        let players = try Player.fetchAll(db) // [Players]
    }
    ```

- **Records can now specify the columns they feed from** ([documentation](https://github.com/groue/GRDB.swift#columns-selected-by-a-request)).
    
    In previous versions of GRDB, `SELECT *` was the norm. GRDB 2.0 introduces `databaseSelection`, which allows any type to define its preferred set of columns:
    
    ```swift
    struct Player : RowConvertible, TableMapping {
        let id: Int64
        let name: String
        
        enum Columns {
            static let id = Column("id")
            static let name = Column("name")
        }
        
        init(row: Row) {
            id = row[Columns.id]
            name = row[Columns.name]
        }
        
        static let databaseTableName = "players"
        static let databaseSelection: [SQLSelectable] = [Columns.id, Columns.name]
    }
    
    // SELECT id, name FROM players
    let players = Player.fetchAll(db)
    ```

- **Record protocols have more precise semantics**: RowConvertible *reads database rows*, TableMapping *builds SQL requests*, and Persistable *writes* ([documentation](https://github.com/groue/GRDB.swift#record-protocols-overview)).
    
    This means that with GRDB 2.0, being able to write `Player.fetchAll(db)` does not imply that `Player.deleteAll(db)` is available: you have a better control on the abilities of your record types.


### Fixed

- GRDB is now able to store and load zero-length blobs.


### New

New features have been added in order to plug a few holes and support the [RxGRDB](https://github.com/RxSwiftCommunity/RxGRDB) and [GRDBObjc](https://github.com/groue/GRDBObjc) companion projects:

- Persistable records can export themselves as dictionaries:
    
    ```swift
    let player = try Player.fetchOne(db, key: 1)
    let dict = player.databaseDictionary // [String: DatabaseValue]
    print(dict)
    // Prints {"id": 1, "name": "Arthur", "score": 1000}
    ```

- Query interface requests learned how to limit the number of deleted rows:
    
    ```swift
    // Delete the last ten players:
    // DELETE FROM players ORDER BY score LIMIT 10
    let request = Player.order(scoreColumn).limit(10)
    try request.deleteAll(db)
    ```

- Prepared statements know the index of their columns:
    
    ```swift
    let statement = try db.makeSelectStatement("SELECT a, b FROM t")
    statement.index(ofColumn: "b")  // 1
    ```

- Row cursors (of type RowCursor) expose their underlying statement:
    
    ```swift
    let rows = try Row.fetchCursor(db, "SELECT ...")
    let statement = rows.statement
    ```

- One can build a Set from a cursor:
    
    ```swift
    let strings = try Set(String.fetchCursor(...))
    ```

- The new `AnyDatabaseReader` and `AnyDatabaseWriter` type erasers help dealing with the `DatabaseReader` and `DatabaseWriter` protocols.


### Breaking Changes

- Requirements have changed: Xcode 9+ / Swift 4

- WatchOS extension targets no longer need `libsqlite3.tbd` to be added to the *Linked Frameworks and Libraries* section of their *General* tab.

- The `Row.value` method has been replaced with subscript notation:

    ```diff
    -row.value(atIndex: 0)
    -row.value(named: "id")
    -row.value(Column("id"))
    +row[0]
    +row["id"]
    +row[Column("id")]
    ```

- Date and NSDate now interpret numerical database values as timestamps that fuel `Date(timeIntervalSince1970:)`. Previous version of GRDB would interpret numbers as [julian days](https://en.wikipedia.org/wiki/Julian_day) (a date representation supported by SQLite). Support for julian days remains, with the `Date(julianDay:)` initializer.

- All `TableMapping` methods that would modify the database have moved to `MutablePersistable`, now the only record protocol that is able to write.

- The `TableMapping.selectsRowID` property has been replaced with `TableMapping.databaseSelection`.
    
    To upgrade, replace:
    
    ```diff
     struct Player: TableMapping {
    -    static let selectsRowID = true
    +    static let databaseSelection: [SQLSelectable] = [AllColumns(), Column.rowID]
     }
    ```

- The `DatabaseCursor` type has been removed, and replaced with several concrete types that all adopt the `Cursor` protocol. Those new types allow dedicated optimizations depending on the type of the fetched elements.
    
    If your application has code that depends on `DatabaseCursor`, make it target the new concrete types, or make it generic on the `Cursor` protocol, just like you'd write generic methods on the Swift `Sequence` protocol.

- `RowConvertible.fetchCursor(_:keys:)` returns a non-optional cursor.

- `Database.primaryKey(_:)` returns a non-optional PrimaryKeyInfo. When a table has no explicit primary key, the result is the hidden rowid column.

- The deprecated `TableMapping.primaryKeyRowComparator` method has been removed.


### Documentation Diff

- [WatchOS installation procedure](https://github.com/groue/GRDB.swift#installation) has been updated with new instructions.
- The [introduction to multithreading with database pools](https://github.com/groue/GRDB.swift#database-pools) has been enhanced.
- The [Rows as Dictionaries](https://github.com/groue/GRDB.swift#rows-as-dictionaries) chapter has been enhanced with instructions for converting a row into a dictionary.
- The [description of cursors](https://github.com/groue/GRDB.swift#cursors) better explains how to choose between a cursor and an array.
- The [Date and DateComponents](https://github.com/groue/GRDB.swift#date-and-datecomponents) chapter has been updated for the new support for unix timestamps.
- The [Fatal Errors](https://github.com/groue/GRDB.swift#fatal-errors) chapter has an enhanced description of value conversion errors and how to handle them.
- The [Usage of raw SQLite pointers](https://github.com/groue/GRDB.swift#raw-sqlite-pointers) chapter has been updated for the new `SQLite3` standard module that comes with Swift4.
- A new [Record Protocols Overview](https://github.com/groue/GRDB.swift#record-protocols-overview) chapter has been added.
- A new [Codable Records](https://github.com/groue/GRDB.swift#codable-records) chapter has been added.
- A new [Columns Selected by a Request](https://github.com/groue/GRDB.swift#columns-selected-by-a-request) chapter describes the new `TableMapping.databaseSelection` property.
- The [Exposing the RowID Column](https://github.com/groue/GRDB.swift#exposing-the-rowid-column) chapter has been updated for the new `TableMapping.databaseSelection` property.


### API diff

```diff
 class Row {
-    func value(atIndex index: Int) -> DatabaseValueConvertible?
-    func value<Value: DatabaseValueConvertible>(atIndex index: Int) -> Value?
-    func value<Value: DatabaseValueConvertible>(atIndex index: Int) -> Value
-    func value(named columnName: String) -> DatabaseValueConvertible?
-    func value<Value: DatabaseValueConvertible>(named columnName: String) -> Value?
-    func value<Value: DatabaseValueConvertible>(named columnName: String) -> Value
-    func value(_ column: Column) -> DatabaseValueConvertible?
-    func value<Value: DatabaseValueConvertible>(_ column: Column) -> Value?
-    func value<Value: DatabaseValueConvertible>(_ column: Column) -> Value
+    subscript(_ index: Int) -> DatabaseValueConvertible?
+    subscript<Value: DatabaseValueConvertible>(_ index: Int) -> Value?
+    subscript<Value: DatabaseValueConvertible>(_ index: Int) -> Value
+    subscript(_ columnName: String) -> DatabaseValueConvertible?
+    subscript<Value: DatabaseValueConvertible>(_ columnName: String) -> Value?
+    subscript<Value: DatabaseValueConvertible>(_ columnName: String) -> Value
+    subscript(_ column: Column) -> DatabaseValueConvertible?
+    subscript<Value: DatabaseValueConvertible>(_ column: Column) -> Value?
+    subscript<Value: DatabaseValueConvertible>(_ column: Column) -> Value
 }

 class SelectStatement {
+    func index(ofColumn columnName: String) -> Int?
 }
 
+extension MutablePersistable {
+    var databaseDictionary: [String: DatabaseValue]
+}
 
-extension TableMapping {
+extension MutablePersistable {
     @discardableResult static func deleteAll(_ db: Database) throws -> Int
     @discardableResult static func deleteAll<Sequence: Swift.Sequence>(_ db: Database, keys: Sequence) throws -> Int where Sequence.Element: DatabaseValueConvertible
     @discardableResult static func deleteOne<PrimaryKeyType: DatabaseValueConvertible>(_ db: Database, key: PrimaryKeyType?) throws -> Bool
     @discardableResult static func deleteAll(_ db: Database, keys: [[String: DatabaseValueConvertible?]]) throws -> Int
     @discardableResult static func deleteOne(_ db: Database, key: [String: DatabaseValueConvertible?]) throws -> Bool
 }
-extension QueryInterfaceRequest {
+extension QueryInterfaceRequest where RowDecoder: MutablePersistable {
     @discardableResult func deleteAll(_ db: Database) throws -> Int
 }

 protocol TableMapping {
-    static var selectsRowID: Bool { get }
+    static var databaseSelection: [SQLSelectable] { get }
 }
 class Record {
-    open class var selectsRowID: Bool
+    open class var databaseSelection: [SQLSelectable]
 }
+struct AllColumns {
+    init()
+}

 class Database {
-    func primaryKey(_ tableName: String) throws -> PrimaryKeyInfo?
+    func primaryKey(_ tableName: String) throws -> PrimaryKeyInfo
 }
 struct PrimaryKeyInfo {
+    var isRowID: Bool { get }
 }

+extension Set {
+    init<C: Cursor>(_ cursor: C) throws where C.Element == Element
+}

-final class DatabaseCursor { }
+final class ColumnCursor<Value: DatabaseValueConvertible & StatementColumnConvertible> : Cursor {
+    typealias Element = Value
+}
+final class DatabaseValueCursor<Value: DatabaseValueConvertible> : Cursor  {
+    typealias Element = Value
+}
+final class NullableColumnCursor<Value: DatabaseValueConvertible & StatementColumnConvertible> : Cursor  {
+    typealias Element = Value?
+}
+final class NullableDatabaseValueCursor<Value: DatabaseValueConvertible> : Cursor  {
+    typealias Element = Value?
+}
+final class RecordCursor<Record: RowConvertible> : Cursor  {
+    typealias Element = Record
+}
+final class RowCursor : Cursor {
+    typealias Element = Row
+    let statement: SelectStatement
+}
 extension DatabaseValueConvertible {
-    static func fetchCursor(...) throws -> DatabaseCursor<Self>
+    static func fetchCursor(...) throws -> DatabaseValueCursor<Self>
 }
 extension DatabaseValueConvertible where Self: StatementColumnConvertible {
+    static func fetchCursor(...) throws -> ColumnCursor<Self>
 }
 extension Optional where Wrapped: DatabaseValueConvertible {
-    static func fetchCursor(...) throws -> DatabaseCursor<Wrapped?>
+    static func fetchCursor(...) throws -> NullableDatabaseValueCursor<Wrapped>
 }
 extension Optional where Wrapped: DatabaseValueConvertible & StatementColumnConvertible {
+    static func fetchCursor(...) throws -> NullableColumnCursor<Wrapped>
 }
 extension Row {
-    static func fetchCursor(...) throws -> DatabaseCursor<Row>
+    static func fetchCursor(...) throws -> RowCursor
 }
 extension RowConvertible where Self: TableMapping {
-    static func fetchCursor(...) throws -> DatabaseCursor<Self>?
+    static func fetchCursor(...) throws -> RecordCursor<Self>
 }
 extension TypedRequest where RowDecoder: RowConvertible {
-    func fetchCursor(_ db: Database) throws -> DatabaseCursor<RowDecoder>
+    func fetchCursor(_ db: Database) throws -> RecordCursor<RowDecoder>
 }
 extension TypedRequest where RowDecoder: DatabaseValueConvertible {
-    func fetchCursor(_ db: Database) throws -> DatabaseCursor<RowDecoder>
+    func fetchCursor(_ db: Database) throws -> DatabaseValueCursor<RowDecoder>
 }
 extension TypedRequest where RowDecoder: DatabaseValueConvertible & StatementColumnConvertible {
+    func fetchCursor(_ db: Database) throws -> ColumnCursor<RowDecoder>
 }
 extension TypedRequest where RowDecoder: _OptionalProtocol, RowDecoder._Wrapped: DatabaseValueConvertible {
-    func fetchCursor(_ db: Database) throws -> DatabaseCursor<RowDecoder._Wrapped?>
+    func fetchCursor(_ db: Database) throws -> NullableDatabaseValueCursor<RowDecoder._Wrapped>
 }
 extension TypedRequest where RowDecoder: _OptionalProtocol, RowDecoder._Wrapped: DatabaseValueConvertible & StatementColumnConvertible {
+    func fetchCursor(_ db: Database) throws -> NullableColumnCursor<RowDecoder._Wrapped>
 }
 extension TypedRequest where RowDecoder: Row {
-    func fetchCursor(_ db: Database) throws -> DatabaseCursor<Row>
+    func fetchCursor(_ db: Database) throws -> RowCursor
 }

 extension TableMapping {
-    @available(*, deprecated) static func primaryKeyRowComparator(_ db: Database) throws -> (Row, Row) -> Bool
 }

+final class AnyDatabaseReader : DatabaseReader {
+     init(_ base: DatabaseReader)
+}
+final class AnyDatabaseWriter : DatabaseWriter {
+     init(_ base: DatabaseWriter)
+}
```

### Experimental API diff

```diff
 enum SQLCount {
-    case star
+    case all
 }
```


## 1.3.0

Released August 18, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v1.2.2...v1.3.0)

**New**

- Upgrade custom SQLite builds to [v3.20.0](https://www.sqlite.org/changes.html) (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib)).
- Complete support for all signed and unsigned integer types: from Int8 toUInt64, all integers can be stored and loaded from the database.

**API diff**

```diff
+extension Int8: DatabaseValueConvertible, StatementColumnConvertible { }
+extension Int16: DatabaseValueConvertible, StatementColumnConvertible { }
+extension UInt8: DatabaseValueConvertible, StatementColumnConvertible { }
+extension UInt16: DatabaseValueConvertible, StatementColumnConvertible { }
+extension UInt32: DatabaseValueConvertible, StatementColumnConvertible { }
+extension UInt64: DatabaseValueConvertible, StatementColumnConvertible { }
+extension UInt: DatabaseValueConvertible, StatementColumnConvertible { }
```


## 1.2.2

Released July 20, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v1.2.1...v1.2.2)

**Fixed**

- The `Configuration.trace` function no longer leaks memory.


## 1.2.1

Released July 19, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v1.2...v1.2.1)

**Fixed**

- Upgrade custom SQLite builds to [v3.19.3](https://www.sqlite.org/changes.html) (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib)).
- The [Query Interface](https://github.com/groue/GRDB.swift/#the-query-interface) now generates `IS NULL` SQL snippets for comparisons with `DatabaseValue.null`:
    
    ```swift
    // SELECT * FROM players WHERE email IS NULL
    Player.filter(Column("email") == DatabaseValue.null)
    ```
    
    It used to generate `= NULL` which would not behave as expected. 
    

## 1.2.0

Released July 13, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v1.1...v1.2)

**New**

- Record types that do not provide values for all table columns in their `encode(to:)` method are now supported.

- The table creation API has been enhanced:

    - SQLite supports untyped columns:
    
        ```swift
        try dbQueue.inDatabase { db in
            // CREATE TABLE t(a, b)
            try db.create(table: "t") { t in
                t.column("a")
                t.column("b")
            }
        }
        ```
        
        Untyped columns behave like decimal, boolean, date columns, and generally all columns with [NUMERIC type affinity](https://sqlite.org/datatype3.html#type_affinity).
        
        This feature addresses [#169](https://github.com/groue/GRDB.swift/issues/169).

    - The `indexed()` methods lets you create a non-unique index on a table column:
    
        ```swift
        try dbQueue.inDatabase { db in
            // CREATE TABLE rounds(score INTEGER)
            // CREATE INDEX rounds_on_score ON rounds(score)
            try db.create(table: "rounds") { t in
                t.column("score", .integer).indexed()
            }
        }
        ```
    
    - It is now possible to define references to tables without any explicit primary key. The generated SQL then uses the `rowid` hidden primary key column:
    
        ```swift
        try dbQueue.inDatabase { db in
            // CREATE TABLE nodes(
            //   name TEXT,
            //   parentId INTEGER REFERENCES nodes(rowid)
            // )
            try db.create(table: "nodes") { t in
                t.column("name", .text)
                t.column("parentId", .integer).references("nodes")
            }
        }
        ```

- `DatabaseQueue`, `DatabasePool` and their common protocol `DatabaseReader` can now perform "unsafe reentrant reads" ([documentation](https://github.com/groue/GRDB.swift#unsafe-concurrency-apis)):
    
    ```swift
    try dbPool.read { db in
        // This is allowed
        try dbPool.unsafeReentrantRead { db in
            ...
        }
    }
    ```


**Fixed**

- `DatabasePool.read`, and `DatabasePool.unsafeRead` now raise a fatal error when used in a reentrant way:
    
    ```swift
    try dbPool.read { db in
        // fatal error: "Database methods are not reentrant."
        try dbPool.read { db in
            ...
        }
    }
    ```
    
    While this change may appear as a breaking change, it is really a fix: reentrant reads deadlock as soon as the maximum number of readers has been reached.


**API diff**

```diff
 final class ColumnDefinition {
+    @discardableResult func indexed() -> Self
 }
 
 final class TableDefinition {
-    func column(_ name: String, _ type: Database.ColumnType) -> ColumnDefinition
+    func column(_ name: String, _ type: Database.ColumnType? = nil) -> ColumnDefinition
 }
 
 protocol DatabaseReader {
+    func unsafeReentrantRead<T>(_ block: (Database) throws -> T) throws -> T
 }
```


## 1.1.0

Released July 1, 2017 &bull; [diff](https://github.com/groue/GRDB.swift/compare/v1.0...v1.1)

**New**

- `DatabaseAggregate` is the protocol for custom aggregate functions (fixes [#236](https://github.com/groue/GRDB.swift/issues/236), [documentation](https://github.com/groue/GRDB.swift#custom-aggregates)):
    
    ```swift
    struct MySum : DatabaseAggregate {
        var sum: Int = 0
        
        mutating func step(_ dbValues: [DatabaseValue]) {
            if let int = Int.fromDatabaseValue(dbValues[0]) {
                sum += int
            }
        }
        
        func finalize() -> DatabaseValueConvertible? {
            return sum
        }
    }
    
    let dbQueue = DatabaseQueue()
    let fn = DatabaseFunction("mysum", argumentCount: 1, aggregate: MySum.self)
    dbQueue.add(function: fn)
    try dbQueue.inDatabase { db in
        try db.execute("CREATE TABLE test(i)")
        try db.execute("INSERT INTO test(i) VALUES (1)")
        try db.execute("INSERT INTO test(i) VALUES (2)")
        try Int.fetchOne(db, "SELECT mysum(i) FROM test")! // 3
    }
    ```

**Fixed**

- `QueryInterfaceRequest.order(_:)` clears the eventual reversed flag, and better reflects the documentation of this method: "Any previous ordering is replaced."

**Deprecated**

- `TableMapping.primaryKeyRowComparator` is deprecated, without any replacement.

**API diff**

```diff
 final class DatabaseFunction {
+    init<Aggregate: DatabaseAggregate>(_ name: String, argumentCount: Int32? = nil, pure: Bool = false, aggregate: Aggregate.Type)
 }
 
+protocol DatabaseAggregate {
+    init()
+    mutating func step(_ dbValues: [DatabaseValue]) throws
+    func finalize() throws -> DatabaseValueConvertible?
+}

 extension TableMapping {
+    @available(*, deprecated)
     static func primaryKeyRowComparator(_ db: Database) throws -> (Row, Row) -> Bool
 }
```


## 1.0.0

Released June 20, 2017 :tada:

**GRDB 1.0 comes with enhancements, and API stability.**

It comes with breaking changes, but the good news is that they are the last (until GRDB 2.0) :sweat_smile:!

- **Requirements have changed: Xcode 8.3+ / Swift 3.1**
    
    As a matter of fact, GRDB 1.0 still supports Xcode 8.1 and Swift 3.0. But future versions are free to use Swift 3.1 features, and will require Xcode 8.3+.
    
    The targetted operating systems are unchanged: iOS 8.0+ / macOS 10.9+ / watchOS 2.0+

- **[Record types](https://github.com/groue/GRDB.swift#records) have their `persistentDictionary` property replaced with the `encode(to:)` method:**
    
    ```swift
    struct Player : Persistable {
        let name: String
        let score: Int
    
        // Old
    //    var persistentDictionary: [String: DatabaseValueConvertible?] {
    //        return [
    //            "name": name,
    //            "score": score,
    //        ]
    //    }
    
        // New
        func encode(to container: inout PersistenceContainer) {
            container["name"] = name
            container["score"] = score
        }
    }
    ```
    
    This is good for applications that declare lists of columns:
    
    ```swift
    struct Player : RowConvertible, Persistable {
        let name: String
        let score: Int
        
        static let databaseTableName = "players"
        
        // Declare Player columns
        enum Columns {
            static let name = Column("name")
            static let score = Column("score")
        }
        
        // Use columns in `init(row:)`
        init(row: Row) {
            name = row.value(Columns.name)
            score = row.value(Columns.score)
        }
        
        // Use columns in the new `encode(to:)` method:
        func encode(to container: inout PersistenceContainer) {
            container[Columns.name] = name
            container[Columns.score] = score
        }
    }
    ```

- **[Database Observation](https://github.com/groue/GRDB.swift#database-changes-observation) has been enhanced:**
    
    `Database.afterNextTransactionCommit(_:)` is the simplest way to handle successful [transactions](https://github.com/groue/GRDB.swift#transactions-and-savepoints), and synchronize the database with other resources such as files, or system sensors ([documentation](https://github.com/groue/GRDB.swift#after-commit-hook)).
    
    ```swift
    // Make sure the database is inside a transaction
    db.inSavepoint {
        // Perform some database job
        try ...
        
        // Register extra job that is only executed after database changes
        // have been committed and written to disk.
        db.afterNextTransactionCommit { ... }
    }
    ```
    
    On the low-level side, applications can now specify the extent of database observation ([documentation](https://github.com/groue/GRDB.swift#observation-extent)).

- **DatabaseMigrator is easier to test**, with its `DatabaseMigrator.migrate(_:upTo:)` method which partially migrates your databases ([documentation](https://github.com/groue/GRDB.swift#migrations)).

- On the side of database schema introspection, the new `Database.foreignKeys(on:)` method lists the foreign keys defined on a table.

**Full list of changes**

```diff
 class Database {
-    func add(transactionObserver: TransactionObserver)
+    func add(transactionObserver: TransactionObserver, extent: TransactionObservationExtent = .observerLifetime)
+    func afterNextTransactionCommit(_ closure: @escaping (Database) -> ())
+    func foreignKeys(on tableName: String) throws -> [ForeignKeyInfo]
 }

-struct DatabaseCoder: DatabaseValueConvertible

 struct DatabaseMigrator {
+    func migrate(_ writer: DatabaseWriter, upTo targetIdentifier: String) throws
 }

 protocol DatabaseWriter : DatabaseReader {
-    func add(transactionObserver: TransactionObserver)
+    func add(transactionObserver: TransactionObserver, extent: TransactionObservationExtent = .observerLifetime)
 }

 protocol MutablePersistable : TableMapping {
-    var persistentDictionary: [String: DatabaseValueConvertible?] { get }
+    func encode(to container: inout PersistenceContainer)
 }

 extension QueryInterfaceRequest {
-    func contains(_ value: SQLExpressible) -> SQLExpression
-    func exists() -> SQLExpression
 }

 extension Request {
-    func adapted(_ adapter: @escaping (Database) throws -> RowAdapter) -> AnyRequest
+    func adapted(_ adapter: @escaping (Database) throws -> RowAdapter) -> AdaptedRequest<Self>
 }

protocol TypedRequest : Request {
-    associatedtype Fetched
+    associatedtype RowDecoder
}

 extension TypedRequest {
-    func adapted(_ adapter: @escaping (Database) throws -> RowAdapter) -> AnyTypedRequest<Fetched>
+    func adapted(_ adapter: @escaping (Database) throws -> RowAdapter) -> AdaptedTypedRequest<Self>
 }
```


## 0.110.0

Released May 28, 2017

**New**

- Upgrade custom SQLite builds to [v3.19.2](https://www.sqlite.org/changes.html) (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib)).
- Upgrade SQLCipher to v3.4.1 ([announcement](https://discuss.zetetic.net/t/sqlcipher-3-4-1-release/1962), [changelog](https://github.com/sqlcipher/sqlcipher/blob/master/CHANGELOG.md))
- A [large test suite](https://travis-ci.org/groue/GRDB.swift) that runs on Travis-CI, thanks to [@swiftlyfalling](https://github.com/swiftlyfalling) in [PR #213](https://github.com/groue/GRDB.swift/pull/213)

**Fixed**

- Remove deprecation warning about `sqlite3_trace`() for [custom SQLite builds](https://github.com/groue/GRDB.swift/blob/master/Documentation/CustomSQLiteBuilds.md) (addresses [#100](https://github.com/groue/GRDB.swift/issues/100))


## 0.109.0

Released May 22, 2017

**Fixed**

- Failed value conversions now consistently crash with a fatal error.

**New**

- `DatabaseValue.losslessConvert()` performs a lossless conversion to a value type.

**Breaking Changes**

- `DatabaseEventKind.impacts(_ selectionInfo:SelectStatement.SelectionInfo)` now returns an non-optional boolean.
- `DatabaseWriter.availableDatabaseConnection` has been replaced by `DatabaseWriter.unsafeReentrantWrite()`.
- `Request.bound(to:)` has been renamed `Request.asRequest(of:)`.
    

## 0.108.0

Released May 17, 2017

**New**

- Use CocoaPods to install GRDB with [SQLCipher](https://github.com/groue/GRDB.swift#encryption):
    
    ```ruby
    pod 'GRDBCipher'
    ```


**Breaking Changes**

- `RowConvertible.awakeFromFetch()` has been removed.


## 0.107.0

Released May 5, 2017

**New**

- `SQLRequest` learned how to reuse cached prepared statements: `SQLRequest("SELECT ...", cached: true)`

- `Database.logError` lets you register a global error logging function:
    
    ```swift
    Database.logError = { resultCode, message in
        NSLog("%@", "SQLite error \(resultCode): \(message)")
    }
    ```


## 0.106.1

Released April 12, 2017

No change, but a better support for Swift Package Manager at the git repository level.


## 0.106.0

Released April 11, 2017

**New**

- Swift Package Manager, thanks to [Andrey Fidrya](https://github.com/zmeyc) in [PR #202](https://github.com/groue/GRDB.swift/pull/202).


## 0.105.0

Released April 6, 2017

**Fixed**

- [FetchedRecordsController](https://github.com/groue/GRDB.swift#fetchedrecordscontroller) used to be able to miss changes performed on requests that use the `COUNT` SQL function. This is fixed. 


**New**

- `DatabaseWriter.availableDatabaseConnection` allows reentrant uses of GRDB, and improves support for [reactive](https://reactivex.io) programming.


**Breaking Changes**

- `DatabaseEventKind.impacts(_ selectionInfo:SelectStatement.SelectionInfo)` now returns an optional boolean which, when nil, tells that GRDB doesn't know if a statement has any impact on the selection of a request. In practice, this happens as soon as a request uses the `COUNT` SQL function. 


## 0.104.0

Released April 3, 2017

**New**

- Support for Xcode 8.3 and Swift 3.1 (Xcode 8.1 and Swift 3 are still supported).
- Upgrade custom SQLite builds to [v3.18.0](https://www.sqlite.org/changes.html) (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib)).
- Support for [reactive](https://reactivex.io) extensions:
    - `SelectStatement.SelectionInfo` is an opaque value that knows which database tables and columns are read by a [select statement](https://github.com/groue/GRDB.swift#prepared-statements).
    - `DatabaseEventKind.impacts(_ selectionInfo:SelectStatement.SelectionInfo)` tells whether a database change has any impact on the results of a select statement. See [Database Changes Observation](https://github.com/groue/GRDB.swift#database-changes-observation)
    - `TableMapping.primaryKeyRowComparator(_ db: Database)` returns a function that compares two database rows and return true if and only if they have the same non-null primary key.

**Breaking Changes**

- SQLite C API is now available right from the GRDB module: you don't need any longer to import `SQLiteiPhoneOS` module et al (see documentation for [Raw SQLite Pointers](https://github.com/groue/GRDB.swift#raw-sqlite-pointers)).
- The [manual installation procedure for WatchOS extensions](https://github.com/groue/GRDB.swift#installation) has changed.
- [Carthage](https://github.com/Carthage/Carthage) is no longer supported. At the present time it is unable to support the various frameworks built by GRDB (system SQLite, SQLCipher, custom SQLite builds, etc.)


## 0.103.0

Released March 26, 2017

**Fixed**

- `DatabaseError` conversion to `NSError` preserves extended result codes.
- `DatabaseQueue.read` and `DatabaseQueue.readFromCurrentState` throw an error upon database modifications.
- Added missing availability checks for SQLite features that are not available on all versions of iOS, macOS, watchOS.
- Removed useless availability checks for SQLite features that are available with [SQLCipher](https://github.com/groue/GRDB.swift#encryption) and [custom SQLite builds](https://github.com/groue/GRDB.swift/blob/master/Documentation/CustomSQLiteBuilds.md).
- Prevent [wrong linking of SQLCipher](https://discuss.zetetic.net/t/important-advisory-sqlcipher-with-xcode-8-and-new-sdks/1688)

**Breaking Changes**

- `DatabaseQueue.writeInTransaction`, alias for `DatabaseQueue.inTransaction`, has been removed.
- `DatabaseValue.value()` has been removed, in favor of `DatabaseValue.storage`.


## 0.102.0

Released March 2, 2017

**New: Error Handling** (fixes [#171](https://github.com/groue/GRDB.swift/issues/171))

- GRDB activates SQLite's [extended result codes](https://www.sqlite.org/rescode.html) for more detailed error reporting.
- The new `ResultCode` type defines constants for all SQLite [result codes and extended result codes](https://www.sqlite.org/rescode.html).
- The SQLite error code of `DatabaseError` can be queried with `resultCode`, or `extendedResultCode`, depending on the level of details you need ([documentation](https://github.com/groue/GRDB.swift#databaseerror)):
    
    ```swift
    do {
        ...
    } catch let error as DatabaseError where error.extendedResultCode == .SQLITE_CONSTRAINT_FOREIGNKEY {
        // handle foreign key constraint error
    } catch let error as DatabaseError where error.resultCode == .SQLITE_CONSTRAINT {
        // handle any other constraint error
    }
    ```


**New: Request**

- The Request protocol for [custom requests](https://github.com/groue/GRDB.swift#custom-requests) learned how to count:
    
    ```swift
    let request: Request = ...
    let count = try request.fetchCount(db) // Int
    ```
    
    Default implementation performs a naive counting based on the request SQL: `SELECT COUNT(*) FROM (...)`. Adopting types can refine the counting SQL by providing their own `fetchCount` implementation.
    
    Thanks [David Hart](https://github.com/hartbit) for this [suggestion](https://github.com/groue/GRDB.swift/issues/176#issuecomment-282783884).


**Breaking Changes**

- `DatabaseError.code` has been removed, replaced with `DatabaseError.resultCode` and `DatabaseError.extendedResultCode` ([documentation](https://github.com/groue/GRDB.swift#databaseerror)).
- `DatabaseMigrator.registerMigrationWithDisabledForeignKeyChecks` has been renamed `DatabaseMigrator.registerMigrationWithDeferredForeignKeyCheck` ([documentation](https://github.com/groue/GRDB.swift#advanced-database-schema-changes))


## 0.101.1

Released January 20, 2017

**New**

- `DatabaseEventKind.tableName` makes it easier to track any change that may happen to a database table ([documentation](https://github.com/groue/GRDB.swift#filtering-database-events))
- `FetchedRecordsController.allowBackgroundChangesTracking(in:)`: call this [FetchedRecordsController](https://github.com/groue/GRDB.swift#fetchedrecordscontroller) method when changes performed while the application is in the background should be processed before the application enters the suspended state.


**Breaking Changes**

- `Configuration.fileAttributes` has been removed (see [Data Protection](https://github.com/groue/GRDB.swift#data-protection))


## 0.100.0

Released January 10, 2017

**New**

- `Row` adopts the Hashable protocol
- [FetchedRecordsController](https://github.com/groue/GRDB.swift#fetchedrecordscontroller) now outputs request changes on all platforms, for both table and collection views. Merged [#160](https://github.com/groue/GRDB.swift/pull/160) by [@kdubb](https://github.com/kdubb).
- Upgrade custom SQLite builds to [v3.16.2](https://www.sqlite.org/changes.html) (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib)).

**Breaking Changes**

- It is now a programmer error to invoke `FetchedRecordsController.fetchedRecords` before `performFetch()`:
    
    ```diff
    final class FetchedRecordsController<Record: RowConvertible> {
    -    var fetchedRecords: [Record]?
    +    var fetchedRecords: [Record]
    }
    ```
    
- The fetched record type of a FetchedRecordsController is now infered from the request that feeds the controller:
    
    ```diff
    final class FetchedRecordsController<Record: RowConvertible> {
    -    convenience init(...:request: Request) throws
    +    convenience init<Request>(...:request: Request) throws where Request: TypedRequest, Request.Fetched == Record
    }
    ```
    
- FetchedRecordsController now automatically compares records by primary key when the record type adopts the TableMapping protocol, such as all Record subclasses. This feature used to require an explicit `compareRecordsByPrimaryKey` initialization parameter:
    
    ```diff
    extension FetchedRecordsController where Record: TableMapping {
    -    convenience init(...:compareRecordsByPrimaryKey: Bool) throws
    }
    ```
    
- Change tracking APIs have been modified:
    
    ```diff
    final class FetchedRecordsController<Record: RowConvertible> {
    -    func trackChanges(recordsWillChange:tableViewEvent:recordsDidChange:)
    +    func trackChanges(willChange:onChange:didChange:)
    }
    ```


## 0.99.2

Released December 22, 2016

**Fixed**

- `Database.cachedSelectStatement()` no longer returns a statement that can not be reused because it has already failed. 


## 0.99.1

Released December 21, 2016

**Fixed**

- An awful bug where SQLite would not drop any table ([#157](https://github.com/groue/GRDB.swift/issues/157))
- [Transaction Observers](https://github.com/groue/GRDB.swift#database-changes-observation) are no longer blinded by the [truncate optimization](https://www.sqlite.org/lang_delete.html#truncateopt) (fixes [#156](https://github.com/groue/GRDB.swift/issues/156))


## 0.99.0 (don't use)

Released December 20, 2016

**Fixed**

- [Transaction Observers](https://github.com/groue/GRDB.swift#database-changes-observation) are no longer blinded by the [truncate optimization](https://www.sqlite.org/lang_delete.html#truncateopt) (fixes [#156](https://github.com/groue/GRDB.swift/issues/156))

**New**

- [FetchedRecordsController](https://github.com/groue/GRDB.swift#fetchedrecordscontroller) no longer crashes whenever an error prevents it from looking for changes after a transaction has potentially modified the tracked request. Instead, it notifies its optional error handler:
    
    ```swift
    controller.trackErrors { (controller, error) in
        print("Missed a transaction because \(error)")
    }
    ```


## 0.98.0

Released December 16, 2016

**New**

- StatementArguments can be concatenated with the `append(contentsOf:)` method and the `+`, `&+`, `+=` operators ([documentation](https://github.com/groue/GRDB.swift/blob/v0.98.0/GRDB/Core/Statement.swift#L443))

- Rows expressed as dictionary literals now preserve column ordering, and allow duplicated column names:
    
    ```swift
    let row: Row = ["foo": 1, "foo": Date(), "baz": nil]
    print(row)
    // Prints <Row foo:1 foo:"2016-12-16 13:19:49.230" baz:NULL>
    ```


## 0.97.0

Released December 15, 2016

**Fixed**

- DatabasePool `read` and `readFromCurrentState` methods now properly throw errors whenever they can't acquire an isolated access to the database.

**New**

- Raw transaction and savepoint SQL statements are properly reflected in [transaction observers](https://github.com/groue/GRDB.swift#database-changes-observation), `Database.isInsideTransaction`, etc.


## 0.96.0

Released December 11, 2016

**New**

- `Request.adapted` modifies a request with a [row adapter](https://github.com/groue/GRDB.swift#row-adapters).
    
    ```swift
    // Person has `email` column, but User expects `identifier` column:
    Person.all()
        .adapted { _ in ColumnMapping(["identifier": "email"]) }
        .bound(to: User.self)
    ```

**Breaking Changes**

- `RowAdapter` protocol has been refactored. This only affects your code if you implement your own [row adapter](https://github.com/groue/GRDB.swift#row-adapters).


## 0.95.0

Released December 9, 2016

**New**

- `SQLRequest`, `AnyRequest`, `TypedRequest` and `AnyTypedRequest` are new protocols and concrete types that let you build [custom fetch requests](https://github.com/groue/GRDB.swift#custom-requests).
- `RangeRowAdapter` is a new kind of [row adapter](https://github.com/groue/GRDB.swift#row-adapters) which exposes a range of columns.

**Breaking Changes**

- `FetchRequest` protocol has been renamed `Request`.


## 0.94.0

Released December 7, 2016

**New**

- `Database.columnCount(in:)` returns the number of columns in a database table. This helps building [row adapters](https://github.com/groue/GRDB.swift#row-adapters) for joined requests.


## 0.93.1

Released December 7, 2016

**Fixed**

- Removed `Record.hasPersistentChangedValues` dependency on `awakeFromFetch()`. This makes it easier to wrap records in other RowConvertible types, since `awakeFromFetch()` can be overlooked without bad consequences on [changes tracking](https://github.com/groue/GRDB.swift#changes-tracking).


## 0.93.0

Released December 4, 2016

**New**

- Upgrade custom SQLite builds to [v3.15.2](https://www.sqlite.org/changes.html) (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib)).


## 0.92.1

Released December 2, 2016

**Fixed**

- `Database.execute(_:)` now iterates all rows of statements (and executes any side effect performed by the evaluation of each row).


## 0.92.0

Released December 1, 2016

**Fixed**

- Fixed a bug in `DatabasePool.readFromCurrentState` where its block argument could see database changes that it should not have seen ([documentation](https://github.com/groue/GRDB.swift#advanced-databasepool)).

**Breaking Changes**

- `DatabaseWriter.readFromWrite` has been renamed `DatabaseWriter.readFromCurrentState`
- `DatabaseReader.nonIsolatedRead` has been renamed `DatabaseReader.unsafeRead`


## 0.91.0

Released November 30, 2016

**Breaking Changes**

Generally speaking, fetching methods can now throw errors. The `fetch` method have been removed, along with `DatabaseSequence` and `DatabaseIterator`, replaced by the `fetchCursor` method and `DatabaseCursor` ([documentation](https://github.com/groue/GRDB.swift#fetching-methods)):

```swift
// No longer supported
let persons = Person.fetch(db) // DatabaseSequence<Person>
for person in persons {        // Person
    ...
}

// New
let persons = try Person.fetchCursor(db) // DatabaseCursor<Person>
while person = try persons.next() {      // Person
    ...
}
```

Many APIs were changed:

### Database Connections

```diff
 final class Database {
-    func tableExists(_ tableName: String) -> Bool
-    func indexes(on tableName: String) -> [IndexInfo]
+    func tableExists(_ tableName: String) throws -> Bool
+    func indexes(on tableName: String) throws -> [IndexInfo]
 }
 
 final class DatabasePool {
-    func read<T>(_ block: (Database) throws -> T) rethrows -> T
-    func nonIsolatedRead<T>(_ block: (Database) throws -> T) rethrows -> T
-    func readFromWrite(_ block: @escaping (Database) -> Void)
+    func read<T>(_ block: (Database) throws -> T) throws -> T
+    func nonIsolatedRead<T>(_ block: (Database) throws -> T) throws -> T
+    func readFromWrite(_ block: @escaping (Database) -> Void) throws
 }
 
 protocol DatabaseReader {
-    func read<T>(_ block: (Database) throws -> T) rethrows -> T
-    func nonIsolatedRead<T>(_ block: (Database) throws -> T) rethrows -> T
+    func read<T>(_ block: (Database) throws -> T) throws -> T
+    func nonIsolatedRead<T>(_ block: (Database) throws -> T) throws -> T
 }
 
 protocol DatabaseWriter {
-    func readFromWrite(_ block: @escaping (Database) -> Void)
+    func readFromWrite(_ block: @escaping (Database) -> Void) throws
 }
```

### Fetching Rows and Values

```diff
 final class Row {
-    static func fetch(...) -> DatabaseSequence<Row>
-    static func fetchAll(...) -> [Row]
-    static func fetchOne(...) -> Row?
+    static func fetchCursor(...) -> DatabaseCursor<Row>
+    static func fetchAll(...) throws -> [Row] {
+    static func fetchOne(...) throws -> Row?
 }
 
 extension DatabaseValueConvertible {
-    static func fetch(...) -> DatabaseSequence<Self>
-    static func fetchAll(...) -> [Self]
-    static func fetchOne(...) -> Self?
+    static func fetchCursor(...) -> DatabaseCursor<Self>
+    static func fetchAll(...) throws -> [Self]
+    static func fetchOne(...) throws -> Self?
 }
 
 extension Optional where Wrapped: DatabaseValueConvertible {
-    static func fetch(...) -> DatabaseSequence<Wrapped?>
-    static func fetchAll(...) -> [Wrapped?]
+    static func fetchCursor(...) throws -> DatabaseCursor<Wrapped?>
+    static func fetchAll(...) throws -> [Wrapped?]
 }
```

### Records and the Query Interface

```diff
 final class FetchedRecordsController<Record: RowConvertible> {
-    init(...)
-    func performFetch(...)
-    func setRequest(...)
+    init(...) throws
+    func performFetch(...) throws
+    func setRequest(...) throws
 }
 
 protocol MutablePersistable : TableMapping {
-    func exists(_ db: Database) -> Bool
+    func exists(_ db: Database) throws -> Bool
 }
 
 extension MutablePersistable {
-    func performExists(_ db: Database) -> Bool
+    func performExists(_ db: Database) throws -> Bool
 }

 extension QueryInterfaceRequest {
-    func fetchCount(...) -> Int
+    func fetchCount(...) throws -> Int
 }
 
 extension QueryInterfaceRequest where T: RowConvertible {
-    func fetch(...) -> DatabaseSequence<T>
-    func fetchAll(...) -> [T]
-    func fetchOne(...) -> T?
+    func fetchCursor(...) throws -> DatabaseCursor<T>
+    func fetchAll(...) throws -> [T]
+    func fetchOne(...) throws -> T?
 }
 
 extension RowConvertible {
-    static func fetch(...) -> DatabaseSequence<Self>
-    static func fetchAll(...) -> [Self]
-    static func fetchOne(...) -> Self?
+    static func fetchCursor(...) throws -> DatabaseCursor<Self> {
+    static func fetchAll(...) throws -> [Self] {
+    static func fetchOne(...) throws -> Self?
 }
 
 extension TableMapping {
-    static func fetchCount(_ db: Database) -> Int
+    static func fetchCount(_ db: Database) throws -> Int
 }
```

### Cursors

```diff
-struct DatabaseSequence<Element>: Sequence
-final class DatabaseIterator<Element>: IteratorProtocol

+extension Array {
+    init<C : Cursor>(_ cursor: C) throws where C.Element == Element
+}

+class AnyCursor<Element> : Cursor {
+    init<C : Cursor>(_ base: C) where C.Element == Element
+    init(_ body: @escaping () throws -> Element?)
+}

+protocol Cursor : class {
+    associatedtype Element
+    func next() throws -> Element?
+}

+extension Cursor {
+    func contains(where predicate: (Element) throws -> Bool) throws -> Bool
+    func enumerated() -> EnumeratedCursor<Self>
+    func filter(_ isIncluded: @escaping (Element) throws -> Bool) -> FilterCursor<Self>
+    func first(where predicate: (Element) throws -> Bool) throws -> Element?
+    func flatMap<ElementOfResult>(_ transform: @escaping (Element) throws -> ElementOfResult?) -> MapCursor<FilterCursor<MapCursor<Self, ElementOfResult?>>, ElementOfResult>
+    func flatMap<SegmentOfResult : Sequence>(_ transform: @escaping (Element) throws -> SegmentOfResult) -> FlattenCursor<MapCursor<Self, IteratorCursor<SegmentOfResult.Iterator>>>
+    func flatMap<SegmentOfResult : Cursor>(_ transform: @escaping (Element) throws -> SegmentOfResult) -> FlattenCursor<MapCursor<Self, SegmentOfResult>>
+    func forEach(_ body: (Element) throws -> Void) throws
+    func map<T>(_ transform: @escaping (Element) throws -> T) -> MapCursor<Self, T>
+    func reduce<Result>(_ initialResult: Result, _ nextPartialResult: (Result, Element) throws -> Result) throws -> Result
+}

+extension Cursor where Element: Equatable {
+    func contains(_ element: Element) throws -> Bool
+}

+extension Cursor where Element: Cursor {
+    func joined() -> FlattenCursor<Self>
+}

+extension Cursor where Element: Sequence {
+    func joined() -> FlattenCursor<MapCursor<Self, IteratorCursor<Self.Element.Iterator>>>
+}

+final class DatabaseCursor<Element> : Cursor
+final class EnumeratedCursor<Base : Cursor> : Cursor
+final class FilterCursor<Base : Cursor> : Cursor
+final class FlattenCursor<Base: Cursor> : Cursor where Base.Element: Cursor
+final class MapCursor<Base : Cursor, Element> : Cursor
+final class IteratorCursor<Base : IteratorProtocol> : Cursor {
+    init(_ base: Base)
+    init<S : Sequence>(_ s: S) where S.Iterator == Base
+}

+extension Sequence {
+    func flatMap<SegmentOfResult : Cursor>(_ transform: @escaping (Iterator.Element) throws -> SegmentOfResult) -> FlattenCursor<MapCursor<IteratorCursor<Self.Iterator>, SegmentOfResult>>
+}
```


## 0.90.1

Released November 18, 2016

**Fixed**

- Fixed a couple Xcode 8.1 warnings

## 0.90.0

Released November 5, 2016

**New**

- Upgrade custom SQLite builds to [v3.15.1](https://www.sqlite.org/changes.html) (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib)).

**Fixed**

- FetchedRecordsController no longer exposes record comparison options to platforms that don't need them. The `isSameRecord` and `compareRecordsByPrimaryKey` parameters are now [iOS only](https://github.com/groue/GRDB.swift#fetchedrecordscontroller-on-ios):
    
    ```swift
    // iOS only
    let controller = FetchedRecordsController<MyRecord>(
        dbQueue,
        request: ...,
        compareRecordsByPrimaryKey: true)
    
    // All platforms
    let controller = FetchedRecordsController<MyRecord>(
        dbQueue,
        request: ...)
    ```


## 0.89.2

Released October 26, 2016

**Fixed**

- Query Interface: `CountableRange.contains()` no longer generates BETWEEN operator.
    
    For example, `1..<10.contains(Column("x"))` now generates `x >= 1 AND x < 10` instead of `x BETWEEN 1 AND 9`. This should better reflect the user intent whenever an Int range tests Double values.


## 0.89.1

Released October 19, 2016

**Fixed**

- When `Database.create(virtualTable:using:)` throws, it is now guaranteed that the virtual table table is not created.
- [FetchedRecordsController](https://github.com/groue/GRDB.swift#fetchedrecordscontroller) learned about `TableMapping.selectsRowID`, and is now able to animate table views populated with [records without explicit primary key](https://github.com/groue/GRDB.swift#the-implicit-rowid-primary-key).
- Restored SQLCipher installation procedure


## 0.89.0

Released October 17, 2016

**Fixed**

- [FetchedRecordsController](https://github.com/groue/GRDB.swift#fetchedrecordscontroller) could miss database changes after its fetch request was modified. Now it properly updates the set of tracked columns and tables.

**New**

- `TableMapping.none()`: a fetch request which fetches nothing.


## 0.88.0

Released October 16, 2016

**New**

- Full-text matching methods accept nil search patterns:
    
    ```swift
    let pattern = FTS3SearchPattern(matchingAllTokensIn: "") // nil
    let documents = Document.matching(pattern).fetchAll(db)  // Empty array
    ```

- Synchronization of an FTS4 or FTS5 full-text table with an external content table ([documentation](https://github.com/groue/GRDB.swift#external-content-full-text-tables)):
    
    ```swift
    // A regular table
    try db.create(table: "books") { t in
        t.column("author", .text)
        t.column("title", .text)
        t.column("content", .text)
        ...
    }

    // A full-text table synchronized with the regular table
    try db.create(virtualTable: "books_ft", using: FTS4()) { t in // or FTS5()
        t.synchronize(withTable: "books")
        t.column("author")
        t.column("title")
        t.column("content")
    }
    ```

- Upgrade custom SQLite builds to [v3.15.0](https://www.sqlite.org/changes.html) (thanks to [@swiftlyfalling](https://github.com/swiftlyfalling/SQLiteLib)).


**Breaking Change**

- The `VirtualTableModule` protocol has been modified:
    
    ```diff
     protocol VirtualTableModule {
    -    func moduleArguments(_ definition: TableDefinition) -> [String]
    +    func moduleArguments(for definition: TableDefinition, in db: Database) throws -> [String]
    +    func database(_ db: Database, didCreate tableName: String, using definition: TableDefinition) throws
     }
    ```

## 0.87.0

Released October 12, 2016

**New**

- Support for custom full-text FTS5 tokenizers ([documentation](https://github.com/groue/GRDB.swift/blob/master/Documentation/FTS5Tokenizers.md))

**Breaking Changes**

- `FTS3Tokenizer` has been renamed `FTS3TokenizerDescriptor`
- `FTS5Tokenizer` has been renamed `FTS5TokenizerDescriptor`


## 0.86.0

Released October 8, 2016

**New**

- **Full-Text Search**. GRDB learned about FTS3, FTS4 and FTS5 full-text engines of SQLite ([documentation](https://github.com/groue/GRDB.swift#full-text-search)).

- **Improved support for the hidden "rowid" column**:

    - `TableMapping.selectsRowID`: this optional static property allows records to fetch their hidden rowID column ([documentation](https://github.com/groue/GRDB.swift#the-implicit-rowid-primary-key)):
    
        ```swift
        // SELECT *, rowid FROM books
        Book.fetchAll(db)
        ```
    
    - `fetchOne(_:key:)`, `fetch(_:keys:)`, `fetchAll(_:keys:)`, `deleteOne(_:key:)`, `deleteAll(_:keys:)` now use the hidden `rowid` column when the table has no explicit primary key.
    
        ```swift
        // DELETE FROM books WHERE rowid = 1
        try Book.deleteOne(db, key: 1)
        ```

- Upgrade custom SQLite builds to [v3.14.2](https://www.sqlite.org/changes.html).

**Breaking Changes**

- `Row.value(column:)` has lost its parameter name: `row.value(Column("id"))`.
- `QueryInterfaceRequest` has lost its public initializer.


## 0.85.0

Released September 28, 2016

**New**

- **Enhanced extensibility**. The low-level types that fuel the query interface [requests](https://github.com/groue/GRDB.swift/#requests) and [expressions](https://github.com/groue/GRDB.swift/#expressions) have been refactored, have lost their underscore prefix, and are stabilizing. A new [GRDB Extension Guide](https://github.com/groue/GRDB.swift/blob/master/Documentation/ExtendingGRDB.md) covers common extension use cases.

- `TableMapping` protocol learned how to delete all records right from the adopting type:
    
    ```swift
    try Person.deleteAll(db)
    ```

- Support for the `LIKE` operator (fixes [#133](https://github.com/groue/GRDB.swift/issues/133)):
    
    ```swift
    // SELECT * FROM persons WHERE email LIKE '%@example.com'
    Person.filter(Column("email").like("%@example.com")).fetchAll(db)
    ```
    
**Breaking Changes**

- The SQLForeignKeyAction, SQLColumnType, SQLConflictResolution, and SQLCollation types have been renamed Database.ForeignKeyAction, Database.ColumnType, Database.ConflictResolution, and Database.CollationName.


## 0.84.0

Released September 16, 2016

**New**

- The Persistable protocol learned about conflict resolution, and can run `INSERT OR REPLACE` queries ([documentation](https://github.com/groue/GRDB.swift#conflict-resolution), fixes [#118](https://github.com/groue/GRDB.swift/issues/118)).


## 0.83.0

Released September 16, 2016

**New**

- Upgrade custom SQLite builds to [v3.14.1](https://www.sqlite.org/changes.html).

**Fixed**

- Restore support for SQLite [pre-update hooks](https://github.com/groue/GRDB.swift#support-for-sqlite-pre-update-hooks)
- `DatabaseValue.fromDatabaseValue()` returns `.Null` for NULL input, instead of nil (fixes [#119](https://github.com/groue/GRDB.swift/issues/119))

**Breaking Change**

- `Row.databaseValue(atIndex:)` and `Row.databaseValue(named:)` have been removed. Use `value(atIndex:)` and `value(named:)` instead:
    
    ```diff
    -let dbValue = row.databaseValue(atIndex: 0)
    +let dbValue: DatabaseValue = row[0]
    ```


## 0.82.1

Released September 14, 2016

**Fixed**

- GRDB builds in the Release configuration (fix [#116](https://github.com/groue/GRDB.swift/issues/116), [#117](https://github.com/groue/GRDB.swift/issues/117), workaround [SR-2623](https://bugs.swift.org/browse/SR-2623))


## 0.82.0

Released September 11, 2016

**New**

- Swift 3

**Breaking Changes**

- The Swift 3 *Grand Renaming* has impacted GRDB a lot.
    
    **General**
    
    - All enum cases now start with a lowercase letter.
    
    **Database Connections**
    
    ```diff
    -typealias BusyCallback = (numberOfTries: Int) -> Bool
    -enum BusyMode
    -enum CheckpointMode
    -enum TransactionKind
    -enum TransactionCompletion
     struct Configuration {
    -    var fileAttributes: [String: AnyObject]?
    +    var fileAttributes: [FileAttributeKey: Any]
     }
     class Database {
    +    typealias BusyCallback = (_ numberOfTries: Int) -> Bool
    +    enum BusyMode {
    +        case immediateError
    +        case timeout(TimeInterval)
    +        case callback(BusyCallback)
    +    }
    +    enum CheckpointMode: Int32 {
    +        case passive
    +        case full
    +        case restart
    +        case truncate
    +    }
    +    enum TransactionKind {
    +        case deferred
    +        case immediate
    +        case exclusive
    +    }
    +    enum TransactionCompletion {
    +        case commit
    +        case rollback
    +    }
     }
     class DatabasePool {
    #if os(iOS)
    -    func setupMemoryManagement(application application: UIApplication)
    +    func setupMemoryManagement(in application: UIApplication) 
    #endif
    #if SQLITE_HAS_CODEC
    -    func changePassphrase(passphrase: String) throws
    +    func change(passphrase: String) throws
    #endif
     }
     class DatabaseQueue {
    #if os(iOS)
    -    func setupMemoryManagement(application application: UIApplication)
    +    func setupMemoryManagement(in application: UIApplication) 
    #endif
    #if SQLITE_HAS_CODEC
    -    func changePassphrase(passphrase: String) throws
    +    func change(passphrase: String) throws
    #endif
     }
    ```
    
    **Rows**
    
    ```diff
     final class Row {
    -    init?(_ dictionary: NSDictionary)
    -    func toNSDictionary() -> NSDictionary
    +    init?(_ dictionary: [AnyHashable: Any])
     }
    ```
    
    **Values**
    
    ```diff
     struct DatabaseValue {
    -    init?(object: AnyObject)
    -    func toAnyObject() -> AnyObject
    +    init?(value: Any)
     }
     protocol DatabaseValueConvertible {
    -    static func fromDatabaseValue(dbValue: DatabaseValue) -> DatabaseValue?
    +    static func fromDatabaseValue(_ dbValue: DatabaseValue) -> DatabaseValue?
     }
    +extension Data : DatabaseValueConvertible
    +extension Date : DatabaseValueConvertible
    +extension URL : DatabaseValueConvertible
    +extension UUID : DatabaseValueConvertible
    ```
    
    **SQL Functions**
    
    ```diff
     class Database {
    -    func addFunction(function: DatabaseFunction)
    -    func removeFunction(function: DatabaseFunction)
    +    func add(function: DatabaseFunction)
    +    func remove(function: DatabaseFunction)
     }
     class DatabasePool {
    -    func addFunction(function: DatabaseFunction)
    -    func removeFunction(function: DatabaseFunction)
    +    func add(function: DatabaseFunction)
    +    func remove(function: DatabaseFunction)
     }
     class DatabaseQueue {
    -    func addFunction(function: DatabaseFunction)
    -    func removeFunction(function: DatabaseFunction)
    +    func add(function: DatabaseFunction)
    +    func remove(function: DatabaseFunction)
     }
     protocol DatabaseReader {
    -    func addFunction(function: DatabaseFunction)
    -    func removeFunction(function: DatabaseFunction)
    +    func add(function: DatabaseFunction)
    +    func remove(function: DatabaseFunction)
     }
     extension DatabaseFunction {
    -static let capitalizedString: DatabaseFunction
    -static let lowercaseString: DatabaseFunction
    -static let uppercaseString: DatabaseFunction
    -static let localizedCapitalizedString: DatabaseFunction
    -static let localizedLowercaseString: DatabaseFunction
    -static let localizedUppercaseString: DatabaseFunction
    +static let capitalize: DatabaseFunction
    +static let lowercase: DatabaseFunction
    +static let uppercase: DatabaseFunction
    +static let localizedCapitalize: DatabaseFunction
    +static let localizedLowercase: DatabaseFunction
    +static let localizedUppercase: DatabaseFunction
     }
    ```
    
    
    **SQL Collations**
    
    ```diff
     class Database {
    -    func addCollation(collation: DatabaseCollation)
    -    func removeCollation(collation: DatabaseCollation)
    +    func add(collation: DatabaseCollation)
    +    func remove(collation: DatabaseCollation)
     }
     class DatabasePool {
    -    func addCollation(collation: DatabaseCollation)
    -    func removeCollation(collation: DatabaseCollation)
    +    func add(collation: DatabaseCollation)
    +    func remove(collation: DatabaseCollation)
     }
     class DatabaseQueue {
    -    func addCollation(collation: DatabaseCollation)
    -    func removeCollation(collation: DatabaseCollation)
    +    func add(collation: DatabaseCollation)
    +    func remove(collation: DatabaseCollation)
     }
     protocol DatabaseReader {
    -    func addCollation(collation: DatabaseCollation)
    -    func removeCollation(collation: DatabaseCollation)
    +    func add(collation: DatabaseCollation)
    +    func remove(collation: DatabaseCollation)
     }
    ```
    
    **Prepared Statements**
    
    ```diff
     class Database {
    -    func selectStatement(sql: String) throws -> SelectStatement
    -    func updateStatement(sql: String) throws -> SelectStatement
    +    func makeSelectStatement(_ sql: String) throws -> SelectStatement
    +    func makeUpdateStatement(_ sql: String) throws -> SelectStatement
     }
     class Statement {
    -    func validateArguments(arguments: StatementArguments) throws
    +    func validate(arguments: StatementArguments) throws
     }
     struct StatementArguments {
    -    init?(_ array: NSArray)
    -    init?(_ dictionary: NSDictionary)
    +    init?(_ array: [Any])
    +    init?(_ dictionary: [AnyHashable: Any])
     }
    ```
    
    **Transaction Observers**
    
    Database events filtering is now performed by transaction observers themselves, in the new `observes(eventsOfKind:)` method of the `TransactionObserver` protocol.
    
    ```diff
     class Database {
    -    func addTransactionObserver(transactionObserver: TransactionObserverType, forDatabaseEvents filter: ((DatabaseEventKind) -> Bool)? = nil)
    -    func removeTransactionObserver(transactionObserver: TransactionObserverType)
    +    func add(transactionObserver: TransactionObserver)
    +    func remove(transactionObserver: TransactionObserver)
     }
     protocol DatabaseWriter : DatabaseReader {
    -    func addTransactionObserver(transactionObserver: TransactionObserverType, forDatabaseEvents filter: ((DatabaseEventKind) -> Bool)? = nil)
    -    func removeTransactionObserver(transactionObserver: TransactionObserverType)
    +    func add(transactionObserver: TransactionObserver)
    +    func remove(transactionObserver: TransactionObserver)
     }
    -protocol TransactionObserverType : class {
    +protocol TransactionObserver : class {
    -    func databaseDidChangeWithEvent(event: DatabaseEvent)
    -    func databaseDidCommit(db: Database)
    -    func databaseDidRollback(db: Database)
    +    func observes(eventsOfKind eventKind: DatabaseEventKind) -> Bool
    +    func databaseDidChange(with event: DatabaseEvent)
    +    func databaseDidCommit(_ db: Database)
    +    func databaseDidRollback(_ db: Database)
     #if SQLITE_ENABLE_PREUPDATE_HOOK
    -    func databaseWillChangeWithEvent(event: DatabasePreUpdateEvent)
    +    func databaseWillChange(with event: DatabasePreUpdateEvent)
     #endif
     }
    ```
    
    **Records**
    
    ```diff
     protocol RowConvertible {
    -    init(_ row: Row)
    +    init(row: Row)
     }
     protocol MutablePersistable {
    -    mutating func didInsertWithRowID(rowID: Int64, forColumn column: String?)
    -    mutating func insert(db: Database) throws
    -    func update(db: Database, columns: Set<String>) throws
    -    mutating func save(db: Database) throws
    -    func delete(db: Database) throws -> Bool
    -    func exists(db: Database) -> Bool
    +    mutating func didInsert(with rowID: Int64, for column: String?)
    +    mutating func insert(_ db: Database) throws
    +    func update(_ db: Database, columns: Set<String>) throws
    +    mutating func save(_ db: Database) throws
    +    @discardableResult func delete(_ db: Database) throws -> Bool
    +    func exists(_ db: Database) -> Bool
     }
     protocol Persistable : MutablePersistable {
    -    func didInsertWithRowID(rowID: Int64, forColumn column: String?)
    -    func insert(db: Database) throws
    -    func save(db: Database) throws
    +    func didInsert(with rowID: Int64, for column: String?)
    +    func insert(_ db: Database) throws
    +    func save(_ db: Database) throws
     }
     protocol TableMapping {
    -    static func databaseTableName() -> String
    +    static var databaseTableName: String { get }
     }
    -public class Record : RowConvertible, TableMapping, Persistable {
    +open class Record : RowConvertible, TableMapping, Persistable {
    -    required init(_ row: Row)
    -    class func databaseTableName() -> String
    -    func awakeFromFetch(row row: Row)
    -    func didInsertWithRowID(rowID: Int64, forColumn column: String?)
    -    func update(db: Database, columns: Set<String>) throws
    -    func insert(db: Database) throws
    -    func save(db: Database) throws
    -    func delete(db: Database) throws -> Bool
    +    required init(row: Row)
    +    class var databaseTableName: String
    +    func awakeFromFetch(row: Row)
    +    func didInsert(with rowID: Int64, for column: String?)
    +    func update(_ db: Database, columns: Set<String>) throws
    +    func insert(_ db: Database) throws
    +    func save(_ db: Database) throws
    +    @discardableResult func delete(_ db: Database) throws -> Bool
     }
    ```
    
    **Query Interface**
    
    ```diff
     protocol FetchRequest {
    -    func prepare(db: Database) throws -> (SelectStatement, RowAdapter?)
    +    func prepare(_ db: Database) throws -> (SelectStatement, RowAdapter?)
     }
    -struct SQLColumn {}
    +struct Column {}
     struct QueryInterfaceRequest<T> {
    -    var distinct: QueryInterfaceRequest<T> { get }
    -    var exists: _SQLExpression { get }
    -    func reverse() -> QueryInterfaceRequest<T>
    +    func distinct() -> QueryInterfaceRequest<T>
    +    func exists() -> _SQLExpression
    +    func reversed() -> QueryInterfaceRequest<T>
     }
     extension _SpecificSQLExpressible {
    -    var capitalizedString: _SQLExpression { get }
    -    var lowercaseString: _SQLExpression { get }
    -    var uppercaseString: _SQLExpression { get }
    -    var localizedCapitalizedString: _SQLExpression { get }
    -    var localizedLowercaseString: _SQLExpression { get }
    -    var localizedUppercaseString: _SQLExpression { get }
    +    var capitalized: _SQLExpression { get }
    +    var lowercased: _SQLExpression { get }
    +    var uppercased: _SQLExpression { get }
    +    var localizedCapitalized: _SQLExpression { get }
    +    var localizedLowercased: _SQLExpression { get }
    +    var localizedUppercased: _SQLExpression { get }
     }
    ```


## 0.81.2 (Swift 2.3)

Released September 28, 2016

**New**

- Added missing `@noescape` qualifiers. Merged [#130](https://github.com/groue/GRDB.swift/pull/130) by [@swiftlyfalling](https://github.com/swiftlyfalling).


## 0.81.1 (Swift 2.3)

Released September 16, 2016

**New**

- Upgrade custom SQLite builds to v3.14.1.

**Fixed**

- `DatabaseValue.fromDatabaseValue()` returns `.Null` for NULL input, instead of nil (fixes [#119](https://github.com/groue/GRDB.swift/issues/119))

**Breaking Change**

- `Row.databaseValue(atIndex:)` and `Row.databaseValue(named:)` have been removed. Use `value(atIndex:)` and `value(named:)` instead:
    
    ```diff
    -let dbValue = row.databaseValue(atIndex: 0)
    +let dbValue: DatabaseValue = row[0]
    ```
    

## 0.81.0 (Swift 2.3)

Released September 10, 2016

**New**

- Swift 2.3


## 0.80.2 (Swift 2.2)

Released September 9, 2016

**Fixed**

- WatchOS framework


## 0.80.1

Released September 8, 2016

**Fixed**

- WatchOS framework is now available through CocoaPods.


## 0.80.0

Released September 7, 2016

**Fixed**

- `Database.tableExists()` learned about temporary tables

**New**

- WatchOS support

- `QueryInterfaceRequest.deleteAll()` deletes database rows:

    ```swift
    try Wine.filter(corked == true).deleteAll(db)
    ```


## 0.79.4

Released August 17, 2016

**Fixed**

- [DatabasePool](https://github.com/groue/GRDB.swift#database-pools) can now open an existing database which is not yet in the WAL mode, and then immediately read from it. It used to crash unless at least one write operation was performed before any read (fixes [#102](https://github.com/groue/GRDB.swift/issues/102)).


## 0.79.3

Released August 16, 2016

**Fixed**

- [Table creation DSL](https://github.com/groue/GRDB.swift#database-schema) accepts auto references with implicit primary key:

    ```swift
    try db.create(table: "nodes") { t in
        t.column("id", .Integer).primaryKey()
        t.column("parentId", .Integer).references("nodes")
    }
    ```

**New**

- Use SQLColumn of the [query interface](https://github.com/groue/GRDB.swift/#the-query-interface) when extracting values from rows:
    
    ```swift
    let nameColumn = SQLColumn("name")
    let name: String = row.value(nameColumn)
    ```


## 0.79.2

Released August 10, 2016

**Fixed**

- Persistable used to generate sub optimal UPDATE requests.


## 0.79.1

Released August 10, 2016

**Fixed**

- [ColumnDefinition](https://github.com/groue/GRDB.swift#database-schema) `check` and `references` methods can now define several constraints:
    
    ```swift
    try db.create(table: "users") { t in
        t.column("name", .Text).notNull()
            .check { length($0) > 0 }
            .check { !["root", "admin"].contains($0) }
    }
    ```

- [Persistable](https://github.com/groue/GRDB.swift#persistable-protocol) `update`, `exists` and `delete` methods now work with objects that have a nil primary key. They used to crash.

- The `update(_:columns:)` method, which performs partial updates, no longer ignores unknown columns.


## 0.79.0

Released August 8, 2016

**Breaking Change**

- Column creation method `defaults(_:)` has been renamed `defaults(to:)`.
    
    ```swift
    try db.create(table: "pointOfInterests") { t in
        t.column("favorite", .Boolean).notNull().defaults(to: false)
        ...
    }
    ```

## 0.78.0

Released August 6, 2016

**New**

- Upgrade sqlcipher to v3.4.0 ([announcement](https://discuss.zetetic.net/t/sqlcipher-3-4-0-release/1273), [changelog](https://github.com/sqlcipher/sqlcipher/blob/master/CHANGELOG.md))

- DSL for table creation and updates (closes [#83](https://github.com/groue/GRDB.swift/issues/83), [documentation](https://github.com/groue/GRDB.swift#database-schema)):

    ```swift
    try db.create(table: "pointOfInterests") { t in
        t.column("id", .Integer).primaryKey()
        t.column("title", .Text)
        t.column("favorite", .Boolean).notNull()
        t.column("longitude", .Double).notNull()
        t.column("latitude", .Double).notNull()
    }
    ```

- Support for the `length` SQLite built-in function:
    
    ```swift
    try db.create(table: "persons") { t in
        t.column("name", .Text).check { length($0) > 0 }
    }
    ```

- Row adopts DictionaryLiteralConvertible:

    ```swift
    let row: Row = ["name": "foo", "date": NSDate()]
    ```


**Breaking Changes**

- Built-in SQLite collations used to be named by string: "NOCASE", etc. Now use the SQLCollation enum: `.Nocase`, etc.

- PrimaryKey has been renamed PrimaryKeyInfo:

    ```swift
    let pk = db.primaryKey("persons")
    pk.columns  // ["id"]
    ```


## 0.77.0

Released July 28, 2016

**New**

- `Database.indexes(on:)` returns the indexes defined on a database table.

- `Database.table(_:hasUniqueKey:)` returns true if a sequence of columns uniquely identifies a row, that is to say if the columns are the primary key, or if there is a unique index on them.

- MutablePersistable types, including Record subclasses, support partial updates:
    
    ```swift
    try person.update(db)                     // Full update
    try person.update(db, columns: ["name"])  // Only updates the name column
    ```

**Breaking Changes**

- MutablePersistable `update` and `performUpdate` methods have changed their signatures. You only have to care about this change if you customize the protocol `update` method.
    
    ```diff
     protocol MutablePersistable : TableMapping {
    -func update(db: Database) throws
    +func update(db: Database, columns: Set<String>) throws
     }
     
     extension MutablePersistable {
     func update(db: Database) throws
    +func update(db: Database, columns: Set<String>) throws
    +func update<S: SequenceType where S.Generator.Element == SQLColumn>(db: Database, columns: S) throws
    +func update<S: SequenceType where S.Generator.Element == String>(db: Database, columns: S) throws
    -func performUpdate(db: Database) throws
    +func performUpdate(db: Database, columns: Set<String>) throws
     }
    ```


## 0.76.0

Released July 19, 2016

**Breaking Change**

- The query interface `order` method now replaces any previously applied ordering (related issue: [#85](https://github.com/groue/GRDB.swift/issues/85)):
    
    ```swift
    // SELECT * FROM "persons" ORDER BY "name"
    Person.order(scoreColumn).order(nameColumn)
    ```


## 0.75.2

Released July 18, 2016

**Fixed**

- Fixed crashes that could happen when using virtual tables (fixes [#82](https://github.com/groue/GRDB.swift/issues/82))


## 0.75.1

Released July 8, 2016

**Fixed**

- Fixed a crash that would happen when performing a full text search in a DatabasePool (fixes [#80](https://github.com/groue/GRDB.swift/issues/80))


## 0.75.0

Released July 8, 2016

**Breaking change**

- Row adapters have been refactored ([documentation](https://github.com/groue/GRDB.swift#row-adapters)).

    ```diff
     // Row "variants" have been renamed row "scopes":
     struct Row {
    -    func variant(named name: String) -> Row?
    +    func scoped(on name: String) -> Row?
     }
     
     // Scope definition: VariantRowAdapter has been renamed ScopeAdapter:
    -struct VariantRowAdapter : RowAdapter {
    -    init(variants: [String: RowAdapter])
    -}
    +struct ScopeAdapter : RowAdapter {
    +    init(_ scopes: [String: RowAdapter])
    +}
     
     // Adding scopes to an existing adapter:
     extension RowAdapter {
    -    func adapterWithVariants(variants: [String: RowAdapter]) -> RowAdapter
    +    func addingScopes(scopes: [String: RowAdapter]) -> RowAdapter
     }
     
     // Implementing custom adapters
     protocol ConcreteRowAdapter {
    -    var variants: [String: ConcreteRowAdapter] { get }
    +    var scopes: [String: ConcreteRowAdapter] { get }
     }
    ```


## 0.74.0

Released July 6, 2016

**New**

- TableMapping protocol lets you delete rows identified by their primary keys, or any columns involved in a unique index (closes [#56](https://github.com/groue/GRDB.swift/issues/56), [documentation](https://github.com/groue/GRDB.swift/tree/Issue56#tablemapping-protocol)):

    ```swift
    try Person.deleteOne(db, key: 1)
    try Person.deleteOne(db, key: ["email": "arthur@example.com"])
    try Citizenship.deleteOne(db, key: ["personID": 1, "countryCode": "FR"])
    try Country.deleteAll(db, keys: ["FR", "US"])
    ```

**Breaking change**

- The `fetch(_:keys:)`, `fetchAll(_:keys:)` and `fetchOne(_:key:)` methods used to accept any dictionary of column/value pairs to identify rows. Now these methods raise a fatal error if the columns are not guaranteed, at the database level, to uniquely identify rows: columns must be the primary key, or involved in a unique index:

    ```swift
    // CREATE TABLE persons (
    //   id INTEGER PRIMARY KEY, -- can fetch and delete by id
    //   email TEXT UNIQUE,      -- can fetch and delete by email
    //   name TEXT               -- nope
    // )
    Person.fetchOne(db, key: ["id": 1])                       // Person?
    Person.fetchOne(db, key: ["email": "arthur@example.com"]) // Person?
    Person.fetchOne(db, key: ["name": "Arthur"]) // fatal error: table persons has no unique index on column name.
    ```
    
    This change harmonizes the behavior of those fetching methods with the new `deleteOne(_:key:)` and `deleteAll(_:keys:)`.


## 0.73.0

Released June 20, 2016

**Improved**

- [FetchedRecordsController](https://github.com/groue/GRDB.swift#fetchedrecordscontroller) doesn't check for changes when a database transaction modifies columns that are not present in the request it tracks.

**New**

- The query interface lets you provide arguments to your sql snippets ([documentation](https://github.com/groue/GRDB.swift/#the-query-interface)):
    
    ```swift
    let wines = Wine.filter(sql: "origin = ?", arguments: ["Burgundy"]).fetchAll(db)
    ```

- Transaction observers can efficiently filter the database changes they are interested in ([documentation](https://github.com/groue/GRDB.swift#filtering-database-events)).

- Support for NSUUID ([documentation](https://github.com/groue/GRDB.swift/#nsuuid))


## 0.72.0

Released June 9, 2016

**Improved**

- NSDecimalNumber used to store as a double in the database, for all values. Now decimal numbers that contain integers fitting Int64 attempt to store integers in the database.

**Breaking Changes**

- Row adapters have been refactored ([documentation](https://github.com/groue/GRDB.swift#row-adapters)).


## 0.71.0

Released June 5, 2016

**Fixed**

- Fix a crash that would sometimes happen when a FetchedRecordsController's callbacks avoid retain cycles by capturing unowned references.
- Improved handling of numeric overflows. Fixes [#68](https://github.com/groue/GRDB.swift/issues/68).


**New**

- GRDB can now use a custom SQLite build ([documentation](https://github.com/groue/GRDB.swift/tree/master/SQLiteCustom)). Merged [#62](https://github.com/groue/GRDB.swift/pull/62) by [@swiftlyfalling](https://github.com/swiftlyfalling).
- With a custom SQLite build, transaction observers can observe individual column values in the rows modified by a transaction ([documentation](https://github.com/groue/GRDB.swift#support-for-sqlite-pre-update-hooks)). Merged [#63](https://github.com/groue/GRDB.swift/pull/63) by [@swiftlyfalling](https://github.com/swiftlyfalling).
- FetchedRecordsController can now fetch other values alongside the fetched records. This grants you the ability to fetch values that are consistent with the notified changes. ([documentation](https://github.com/groue/GRDB.swift#the-changes-notifications))


**Breaking Changes**

- iOS7 is no longer supported.


## 0.70.1

Released May 30, 2016

**Fixed**

- `Database.cachedUpdateStatement(sql)` no longer returns a statement that can not be reused because it has already failed.


## 0.70.0

Released May 28, 2016

**New**

- `Database.inSavepoint()` allows fine-grained committing and rollbacking of database statements ([documentation](https://github.com/groue/GRDB.swift#transactions-and-savepoints)). Closes [#61](https://github.com/groue/GRDB.swift/issues/61).


## 0.69.0

Released May 28, 2016

**Fixed**

- Database changes that are on hold because of a [savepoint](https://www.sqlite.org/lang_savepoint.html) are only notified to [transaction observers](https://github.com/groue/GRDB.swift#database-changes-observation) after the savepoint has been released. In previous versions of GRDB, savepoints had the opportunity to rollback a subset of database events, and mislead transaction observers about the actual content of a transaction. Related issue: [#61](https://github.com/groue/GRDB.swift/issues/61).

**New**

- `DatabaseEvent.copy()` lets you store a database event notified to a transaction observer ([documentation](https://github.com/groue/GRDB.swift#database-changes-observation)).


## 0.68.0

Released May 28, 2016

**New**

This release provides tools for your custom persistence mechanisms that don't use the built-in [Persistable](https://github.com/groue/GRDB.swift#persistable-protocol) protocol, and addresses issue [#60](https://github.com/groue/GRDB.swift/issues/60).

- `Database.primaryKey(tableName)` lets you introspect a table's primary key ([documentation](https://github.com/groue/GRDB.swift#database-schema-introspection)).
- `Database.cachedSelectStatement(sql)` and `Database.cachedUpdateStatement(sql)` provide robust caching of prepared statements ([documentation](https://github.com/groue/GRDB.swift#prepared-statements-cache))


## 0.67.0

Released May 22, 2016

**New**

- **Row adapters** let you map column names for easier row consumption ([documentation](https://github.com/groue/GRDB.swift#row-adapters)). Fixes [#50](https://github.com/groue/GRDB.swift/issues/50).


## 0.66.0

Released May 21, 2016

**Fixed**

- The Record class no longer adopts the CustomStringConvertible protocol. This frees the `description` identifier for your record properties. Fixes [#58](https://github.com/groue/GRDB.swift/issues/58).

- Several database connections can now be used at the same time: you can move values from one database to another. Fixes [#55](https://github.com/groue/GRDB.swift/issues/55).

**Breaking Changes**

- The maximum number of reader connections in a database pool is now configured in a Configuration object.

    ```diff
     final class DatabasePool {
    -    init(path: String, configuration: Configuration = default, maximumReaderCount: Int = default) throws
    +    init(path: String, configuration: Configuration = default) throws
     }
     struct Configuration {
    +    var maximumReaderCount: Int = default
     }
    ```


## 0.65.0

Released May 19, 2016

**Fixed**

- GRDB throws an early error when a connection to a file can not be established because it has the wrong format, or is encrypted. Fixes [#54](https://github.com/groue/GRDB.swift/issues/54).

**Breaking Change**

- The `FetchRequest` struct has been renamed `QueryInterfaceRequest`. A new `FetchRequest` protocol has been introduced. All APIs that used to consume the `FetchRequest` struct now consume the `FetchRequest` protocol.

    This change should not have any consequence on your source code, and paves the way for easier configuration of any piece of "code that fetches".
    
    ```diff
    -struct FetchRequest<T> {
    -}
    +protocol FetchRequest {
    +    func selectStatement(db: Database) throws -> SelectStatement
    +}
    +struct QueryInterfaceRequest<T> : FetchRequest {
    +    init(tableName: String)
    +}
    ```


## 0.64.0

Released May 18, 2016

**Fixed**

- Restored GRDBCipher framework.

**Breaking Changes**

- `DatabaseValue.failableValue()` has been removed. Instead, use DatabaseConvertible.fromDatabaseValue():
    
    ```diff
    -let date = dbValue.failableValue() as NSDate?
    +let date = NSDate.fromDatabaseValue(dbValue)
    ```

- `Row.databaseValue(named:)` now returns an optional DatabaseValue. It is nil when the column does not exist in the row.
    
    ```diff
     class Row {
    -    func databaseValue(named columnName: String) -> DatabaseValue
    +    func databaseValue(named columnName: String) -> DatabaseValue?
     }
    ```

- Row subscripting by column name has been removed. Instead, use `Row.databaseValue(named:)`
    
    ```diff
     class Row {
    -    subscript(columnName: String) -> DatabaseValue?
     }
    ```


## 0.63.0

Released May 17, 2016

**Fixed**

- Restored support for iOS before 8.2 and macOS before 10.10. Fixes [#51](https://github.com/groue/GRDB.swift/issues/51).

**Breaking Changes**

- Support for advanced migrations is not available until iOS 8.2 and macOS 10.10:
    
    ```diff
     struct DatabaseMigrator {
    -    mutating func registerMigration(identifier: String, withDisabledForeignKeyChecks disabledForeignKeyChecks: Bool = false, migrate: (Database) throws -> Void)
    +    mutating func registerMigration(identifier: String, migrate: (Database) throws -> Void)
    +    @available(iOS 8.2, OSX 10.10, *)
    +    mutating func registerMigrationWithDisabledForeignKeyChecks(identifier: String, migrate: (Database) throws -> Void)
    ```


## 0.62.0

Released May 12, 2016

**Breaking Changes**

- FetchedRecordsController has been refactored ([documentation](https://github.com/groue/GRDB.swift#fetchedrecordscontroller)):
    - delegate has been replaced by callbacks
    - features that target UITableView are now iOS only.

    ```diff
     final class FetchedRecordsController<Record: RowConvertible> {
    -    weak var delegate: FetchedRecordsControllerDelegate?
    -    func recordAtIndexPath(indexPath: NSIndexPath) -> Record
    -    func indexPathForRecord(record: Record) -> NSIndexPath?
    -    var sections: [FetchedRecordsSectionInfo<Record>]
    +    #if os(iOS)
    +        typealias WillChangeCallback = FetchedRecordsController<Record> -> ()
    +        typealias DidChangeCallback = FetchedRecordsController<Record> -> ()
    +        typealias TableViewEventCallback = (controller: FetchedRecordsController<Record>, record: Record, event: TableViewEvent) -> ()
    +        func trackChanges(
    +            recordsWillChange willChangeCallback: WillChangeCallback? = nil,
    +            tableViewEvent tableViewEventCallback: TableViewEventCallback? = nil,
    +            recordsDidChange didChangeCallback: DidChangeCallback? = nil)
    +        func recordAtIndexPath(indexPath: NSIndexPath) -> Record
    +        func indexPathForRecord(record: Record) -> NSIndexPath?
    +        var sections: [FetchedRecordsSectionInfo<Record>]
    +    #else
    +        typealias WillChangeCallback = FetchedRecordsController<Record> -> ()
    +        typealias DidChangeCallback = FetchedRecordsController<Record> -> ()
    +        func trackChanges(
    +            recordsWillChange willChangeCallback: WillChangeCallback? = nil,
    +            recordsDidChange didChangeCallback: DidChangeCallback? = nil)
    +    #endif
     }
    -protocol FetchedRecordsControllerDelegate : class { }
    ```


## 0.61.0

Released May 10, 2016

**New**

- `FetchedRecordsController` is now exposed in macOS CocoaPods framework ([documentation](https://github.com/groue/GRDB.swift#fetchedrecordscontroller))

**Fixed**

- Transactions that fail precisely on the COMMIT statement are now rollbacked (they used to remain open).


## 0.60.1

Released May 7, 2016

**Fixed**

- A crash that did happen when DatabasePool would incorrectly share a database statement between several reader connections.
- A memory leak that did happen when a Database connection was deallocated while some database statements were still alive.


## 0.60.0

Released May 5, 2016

**New**

- `DatabaseReader.backup(to destination: DatabaseWriter)` backups a database to another ([documentation](https://github.com/groue/GRDB.swift#backup)).


## 0.59.1

Released April 25, 2016

**Fixed**

- Carthage support is restored. Fixes [#41](https://github.com/groue/GRDB.swift/issues/41).


## 0.59.0

Released April 23, 2016

**New**

- `Database.isInsideTransaction` is true if database is currently inside a transaction.

**Fixed**

- FetchRequest.reverse() sorts by reversed RowID when no base ordering has been specified.


## 0.58.0

Released April 20, 2016

**New**

- `Database.lastInsertedRowID`: The rowID of the most recent successful INSERT.
- `Database.changesCount`: The number of rows modified, inserted or deleted by the most recent successful INSERT, UPDATE or DELETE statement.
- `Database.totalChangesCount`: The total number of rows modified, inserted or deleted by all successful INSERT, UPDATE or DELETE statements since the database connection was opened.

**Breaking Changes**

- `Database.execute()` and `UpdateStatement.execute()` now return Void. To get the last inserted rowId, use the `Database.lastInsertedRowID` property.


## 0.57.0

Released April 8, 2016

**Breaking Changes**

- Direct access to the database through DatabaseQueue and DatabasePool is no longer supported, because it can hide subtle concurrency bugs in your application:
    
    ```swift
    // No longer supported, because too dangerous:
    try dbQueue.execute("INSERT ...")
    let person = Person.fetchOne(dbQueue, key: 1)
    
    // Always use an explicit DatabaseQueue or DatabasePool method instead:
    try dbQueue.inDatabase { db in
        try db.execute("INSERT ...")
        let person = Person.fetchOne(db, key: 1)
    }
    
    // Extract values:
    let person = dbQueue.inDatabase { db in
        Person.fetchOne(db, key: 1)
    }
    ```
    
    For more information, see [database connections](https://github.com/groue/GRDB.swift#database-connections).
    
    If you are interested in the reasons behind a change that may look like a regression, read https://medium.com/@gwendal.roue/four-different-ways-to-handle-sqlite-concurrency-db3bcc74d00e.

- The following methods have changed their signatures:
    
    ```swift
    protocol MutablePersistable {
        mutating func insert(db: Database) throws
        func update(db: Database) throws
        mutating func save(db: Database) throws
        func delete(db: Database) throws -> Bool
        func exists(db: Database) -> Bool
    }
    
    protocol Persistable {
        func insert(db: Database) throws
        func save(db: Database) throws
    }
    
    class Record {
        func insert(db: Database) throws
        func update(db: Database) throws
        func save(db: Database) throws
        func delete(db: Database) throws -> Bool
        func exists(db: Database) -> Bool
    }
    ```


## 0.56.2

Released April 5, 2016

**Fixed**

- The `save()` method accepts again DatabaseQueue and DatabasePool arguments.


## 0.56.1

Released April 5, 2016

**Fixed**

- Restored CocoaPods support for iOS 8+ and macOS 10.9+


## 0.56.0

Released April 5, 2016

**New**

- The new framework GRDBCipher embeds [SQLCipher](https://www.zetetic.net/sqlcipher/) and can encrypt databases ([documentation](https://github.com/groue/GRDB.swift#encryption))
- `DatabaseQueue.path` and `DatabasePool.path` give the path to the database.

**Fixed**

- Restored iOS 7 compatibility

**Breaking Changes** (reverted in [0.56.2](#0562))

- The `save()` method now only accepts a database connection, and won't accept a database queue or database pool as an argument. This change makes sure that this method that may execute several SQL statements is called in an isolated fashion.


## 0.55.0

Released March 31, 2016

**New (iOS only)**

- `DatabaseQueue.setupMemoryManagement(application:)` and `DatabasePool.setupMemoryManagement(application:)` make sure GRDB manages memory as a good iOS citizen ([documentation](https://github.com/groue/GRDB.swift#memory-management-on-ios)).


## 0.54.2

Released March 31, 2016

**Fixed**

- Messages of failed preconditions are no longer lost when GRDB is built in Release configuration. Fixes [#37](https://github.com/groue/GRDB.swift/issues/37).


## 0.54.1

Released March 29, 2016

This release restores CocoaPods support for iOS 9.0+ and macOS 10.11+. We'll try to bring back CocoaPods support for iOS 8.0+ or macOS 10.9+ in a further release.


## 0.54.0

Released March 29, 2016

**New**

- `FetchedRecordsController` helps feeding a UITableView with the results returned from a database request ([documentation](https://github.com/groue/GRDB.swift#fetchedrecordscontroller)). Many thanks to [Pascal Edmond](https://github.com/pakko972) for this grandiose feature.

- The standard Swift string properties `capitalizedString`, `lowercaseString`, `uppercaseString`, `localizedCapitalizedString`, `localizedLowercaseString`, `localizedUppercaseString` are available for your database requests ([documentation](https://github.com/groue/GRDB.swift#unicode)).

- The standard Swift comparison functions `caseInsensitiveCompare`, `localizedCaseInsensitiveCompare`, `localizedCompare`, `localizedStandardCompare` and `unicodeCompare` are available for your database requests ([documentation](https://github.com/groue/GRDB.swift#unicode)).


**Fixed**

- The query interface `uppercaseString` and `lowercaseString` no longer invoke the non unicode aware UPPER and LOWER SQLite functions. They instead call the  standard Swift String properties `uppercaseString` and `lowercaseString`.


**Breaking Change**

- The following method has changed its signature:

    ```swift
    protocol RowConvertible {
        mutating func awakeFromFetch(row row: Row)
    }
    ```


## 0.53.0

Released March 25, 2016

**Fixed**

- `Row.value()` and `DatabaseValue.value()` now raise a fatal error when they can not convert a non-NULL value to the requested type ([documentation](https://github.com/groue/GRDB.swift/#column-values)), effectively preventing silent data loss.
    
    Use the new `DatabaseValue.failableValue()` method if you need the old behavior that returned nil for failed conversions.

**New**

- `Row.databaseValue(atIndex:)` and `Row.databaseValue(named:)` expose the [DatabaseValues](https://github.com/groue/GRDB.swift/#databasevalue) of a row.
- `DatabaseValue.failableValue()` returns nil when a non-NULL value can not be converted to the requested type.


## 0.52.1

Released March 24, 2016

**Fixed**

- The [query interface](https://github.com/groue/GRDB.swift/#the-query-interface) now generates robust SQL for explicit boolean comparisons.
    
    ```swift
    // SELECT * FROM "pointOfInterests" WHERE "favorite"
    PointOfInterest.filter(favorite == true).fetchAll(db)
    ```
    
    Previous versions used to generate fragile comparisons to 0 and 1 which did badly interpret true values such as 2.


## 0.52.0

Released March 21, 2016

**New**

- Swift 2.2, and Xcode 7.3
- `Row` adopts the standard `Equatable` protocol.


## 0.51.2

Released March 14, 2016

**Fixed**

- A race condition that could prevent `Configuration.fileAttributes` from being applied to some database files.


## 0.51.1

Released March 13, 2016

Nothing new, but performance improvements


## 0.51.0

Released March 13, 2016

**New**

- Support for file attributes
    
    ```swift
    var config = Configuration()
    config.fileAttributes = [NSFileProtectionKey: NSFileProtectionComplete]
    let dbPool = DatabasePool(path: ".../db.sqlite", configuration: config)
    ```
    
    GRDB will take care of applying them to the database file and all its derivatives (`-wal` and `-shm` files created by the [WAL mode](https://www.sqlite.org/wal.html), as well as [temporary files](https://www.sqlite.org/tempfiles.html)).


## 0.50.1

Released March 12, 2016

**Fixed**

- A database connection won't close as long as there is a database sequence being iterated.


## 0.50.0

Released March 12, 2016

**New**

- Database updates no longer need to be executed in a closure:
    
    ```swift
    // Before:
    try dbQueue.inDatabase { db in
        try db.execute("CREATE TABLE ...")
        let person = Person(...)
        try person.insert(db)
    }
    
    // New:
    try dbQueue.execute("CREATE TABLE ...")
    let person = Person(...)
    try person.insert(dbQueue)
    ```

- DatabaseQueue and DatabasePool both adopt the new [DatabaseReader](https://github.com/groue/GRDB.swift/tree/master/GRDB/Core/DatabaseReader.swift) and [DatabaseWriter](https://github.com/groue/GRDB.swift/tree/master/GRDB/Core/DatabaseWriter.swift) protocols.


**Breaking Changes**

- The following methods have changed their signatures:
    
    ```swift
    protocol MutablePersistable {
        mutating func insert(db: DatabaseWriter) throws
        func update(db: DatabaseWriter) throws
        mutating func save(db: DatabaseWriter) throws
        func delete(db: DatabaseWriter) throws -> Bool
        func exists(db: DatabaseReader) -> Bool
    }
    
    protocol Persistable {
        func insert(db: DatabaseWriter) throws
        func save(db: DatabaseWriter) throws
    }
    
    class Record {
        func insert(db: DatabaseWriter) throws
        func update(db: DatabaseWriter) throws
        func save(db: DatabaseWriter) throws
        func delete(db: DatabaseWriter) throws -> Bool
        func exists(db: DatabaseReader) -> Bool
    }
    ```


## 0.49.0

Released March 11, 2016

**New**

- Read-only database pools grant you with concurrent reads on a database, without activating the WAL mode.
- All fetchable types can now be fetched directly from database queues and pools:
    
    ```swift
    // Before:
    let persons = dbQueue.inDatabase { db in
        Person.fetchAll(db)
    }
    
    // New:
    let persons = Person.fetchAll(dbQueue)
    ```

**Breaking Changes**

- [Transaction observers](https://github.com/groue/GRDB.swift#database-changes-observation) are no longer added to Database instances, but to DatabaseQueue and DatabasePool.


## 0.48.0

Released March 10, 2016

**New**

- `DatabaseQueue.releaseMemory()` and `DatabasePool.releaseMemory()` claim non-essential memory ([documentation](https://github.com/groue/GRDB.swift#memory-management))

**Breaking Changes**

- Custom [functions](https://github.com/groue/GRDB.swift#custom-sql-functions) and [collations](https://github.com/groue/GRDB.swift#string-comparison) are no longer added to Database instances, but to DatabaseQueue and DatabasePool.


## 0.47.0

Released March 10, 2016

**New**

- Support for concurrent accesses to the database, using the SQLite [WAL Mode](https://www.sqlite.org/wal.html). ([documentation](https://github.com/groue/GRDB.swift#database-pools))


## 0.46.0

Released March 5, 2016

**New**

- Improved counting support in the query interface ([documentation](https://github.com/groue/GRDB.swift#fetching-aggregated-values))

**Breaking Changes**

- Swift enums that behave like other database values now need to declare `DatabaseValueConvertible` adoption. The `DatabaseIntRepresentable`, `DatabaseInt32Representable`, `DatabaseInt64Representable` and `DatabaseStringRepresentable` protocols have been removed ([documentation](https://github.com/groue/GRDB.swift#swift-enums))


## 0.45.1

Released February 11, 2016

**Fixed**

- Restored iOS 7 compatibility


## 0.45.0

Released February 9, 2016

**Breaking Change**

- Transaction observers are no longer retained ([documentation](https://github.com/groue/GRDB.swift#database-changes-observation)).


## 0.44.0

Released February 9, 2016

**Fixed**

- `row.value(named:)` and `row[_]` reliably returns the value for the leftmost case-insensitive matching column.
- A memory leak

**New**

Support for more SQL expressions in the [query interface](https://github.com/groue/GRDB.swift/#the-query-interface):

- `IN (subquery)`
- `EXISTS (subquery)`


## 0.43.1

Released February 4, 2016

**Fixed**

- SQL queries ending with a semicolon followed by whitespace characters no longer throw errors.


## 0.43.0

Released February 1, 2016

**Breaking Changes**

- Static method `RowConvertible.fromRow(_:Row)` has been replaced by a regular conversion initializer `RowConvertible.init(_:Row)` ([documentation](https://github.com/groue/GRDB.swift#rowconvertible-protocol))


## 0.42.1

Released January 29, 2016

**Fixed**

- Improved consistency of the [query interface](https://github.com/groue/GRDB.swift/#the-query-interface).


## 0.42.0

Released January 28, 2016

**New**

- The query interface lets you write pure Swift instead of SQL ([documentation](https://github.com/groue/GRDB.swift/#the-query-interface)):
    
    ```swift
    let wines = Wine.filter(origin == "Burgundy").order(price).fetchAll(db)
    ```

**Breaking Changes**

- `DatabasePersistable` and `MutableDatabasePersistable` protocols have been renamed `Persistable` and `MutablePersistable` ([documentation](https://github.com/groue/GRDB.swift/#persistable-protocol))
- `DatabaseTableMapping` protocol has been renamed `TableMapping` ([documentation](https://github.com/groue/GRDB.swift/#tablemapping-protocol))


## 0.41.0

Released January 17, 2016

**New**

You can now register several database observers, thanks to [@pakko972](https://github.com/pakko972) ([documentation](https://github.com/groue/GRDB.swift#database-changes-observation)):

- `Database.addTransactionObserver()`
- `Database.removeTransactionObserver()`

**Breaking Changes**

- `Configuration.transactionObserver` has been removed.


## 0.40.0

Released January 14, 2016

**New**

- Various [performance improvements](https://github.com/groue/GRDB.swift/wiki/Performance)
- `Statement.unsafeSetArguments(_)` binds arguments in a prepared statement without checking if arguments fit.


## 0.39.1

Released January 13, 2016

**New**

- Various [performance improvements](https://github.com/groue/GRDB.swift/wiki/Performance)

**Fixed**

- Fixed the change tracking of Record subclasses that mangle the case of column names.


## 0.39.0

Released January 11, 2016

**Breaking Changes**

- Removed partial update introduced in 0.38.0.


## 0.38.2

Released January 10, 2016

**Fixed**

- Preconditions on invalid statements arguments are restored.

## 0.38.1

Released January 10, 2016

**New**

- Various [performance improvements](https://github.com/groue/GRDB.swift/wiki/Performance)


## 0.38.0

Released January 8, 2016

**New**

- `Record.update()` and `DatabasePersistable.update()` can execute partial updates:
    
    ```swift
    try person.update(db)                    // Full update
    try person.update(db, columns: ["age"])  // Only updates the age column
    ```

**Breaking Changes**

- `Statement.arguments` is no longer optional.
- Your Record subclasses and DatabasePersistable types that provide custom implementation of `update` must use the signature below:
    
    ```swift
    func update(db: Database, columns: [String]? = nil) throws
    ```


## 0.37.1

Released January 7, 2016

**Fixed**

- Remove method `fromRow()` from NSData, NSDate, NSNull, NSNumber, NSString and NSURL, which should have been removed in v0.36.0.


## 0.37.0

Released January 7, 2016

**Fixed**

- A named argument such as `:name` can now be used several times in a statement.
- Validation of statement arguments is much more solid (and tested).

**New**

- `Database.execute()` can now execute several statements separated by a semicolon.
- `Statement.validateArguments(_)` throws an error if the arguments parameter doesn't match the prepared statement:
    
    ```swift
    let statement = try db.selectStatement("SELECT * FROM persons WHERE id = ?")
    // OK
    try statement.validateArguments([1])
    // Error: wrong number of statement arguments: 2
    try statement.validateArguments([1, 2])
    ```

**Breaking Changes**

- `Database.executeMultiStatement(sql)` has been removed. To execute several SQL statements separated by a semicolon, use `Database.execute()` instead.


## 0.36.0

Released December 28, 2015

**Fixed**

- `DatabaseValueConvertible` no longer inherits from `RowConvertible`.
- `Database.execute()` now accepts SQL queries that fetch rows ([#15](https://github.com/groue/GRDB.swift/issues/15)).

**Breaking Changes**

- Methods that return prepared statements can now throw errors ([documentation](https://github.com/groue/GRDB.swift#prepared-statements)).
- `Row(dictionary:)` has been renamed `Row(_:)`.
- `RowConvertible.awakeFromFetch()` now takes a database argument ([documentation](https://github.com/groue/GRDB.swift#rowconvertible-protocol)).


## 0.35.0

Released December 22, 2015

The Record class has been refactored so that it gets closer from the RowConvertible and DatabasePersistable protocols. It also makes it easier to write subclasses that have non-optional properties.

Methods names that did not match [Swift 3 API Design Guidelines](https://swift.org/documentation/api-design-guidelines.html) have been refactored.

**New**

- `Float` adopts DatabaseValueConvertible, and can be stored and fetched from the database without Double conversion ([documentation](https://github.com/groue/GRDB.swift#values)).

**Breaking Changes**

Record ([documentation](https://github.com/groue/GRDB.swift#record-class)):

- `Record.storedDatabaseDictionary` has been renamed `persistentDictionary`.
- `Record.reload()` has been removed. You have to provide your own implementation, should you need reloading.
- `Record.init(row: Row)` has been renamed `Record.init(_ row: Row)` (unlabelled row argument).
- `Record.updateFromRow()` has been removed. Override `init(_ row: Row)` instead.
- `Record.didInsertWithRowID(_:forColumn:)` should be overridden by Record subclasses that are interested in their row ids.
- `Record.databaseEdited` has been renamed `hasPersistentChangedValues`.
- `Record.databaseChanges` has been renamed `persistentChangedValues` and now returns `[String: DatabaseValue?]`, the dictionary of old values for changed columns.

Row:

- `Row.value(named:)` and `Row.dataNoCopy(named:)` returns nil if no such column exists in the row. It used to crash with a fatal error ([documentation](https://github.com/groue/GRDB.swift#column-values)).

DatabasePersistable:

- `DatabasePersistable.storedDatabaseDictionary` has been renamed `persistentDictionary` ([documentation](https://github.com/groue/GRDB.swift#persistable-protocol)).

DatabaseValue:

- `DatabaseValue` has no public initializers. To create one, use `DatabaseValue.Null`, or the fact that Int, String, etc. adopt the DatabaseValueConvertible protocol: `1.databaseValue`, `"foo".databaseValue` ([documentation](https://github.com/groue/GRDB.swift#custom-value-types)).

DatabaseMigrator:

- `DatabaseMigrator.registerMigrationWithoutForeignKeyChecks(_:_:)` has been renamed `DatabaseMigrator.registerMigration(_:withDisabledForeignKeyChecks:migrate:)`  ([documentation](https://github.com/groue/GRDB.swift#advanced-database-schema-changes)).


## 0.34.0

Released December 14, 2015

**New**

- `DatabaseValueConvertible` now inherits from `RowConvertible`.

**Breaking Changes**

- `RowConvertible` no longer requires an `init(row:Row)` initializer, but a `static func fromRow(_:Row) -> Self` factory method.
- `RowConvertible` dictionary initializers have been removed.


## 0.33.0

Released December 11, 2015

**New**

- The `DatabasePersistable` and `MutableDatabasePersistable` protocols grant any adopting type the persistence methods that used to be reserved to subclasses of `Record` ([#12](https://github.com/groue/GRDB.swift/issues/12))
- `Database.clearSchemaCache()`

**Breaking Changes**

- `RecordError` has been renamed `PersistenceError`
- `Record.databaseTableName()` now returns a non-optional String.


## 0.32.2

Released December 3, 2015

**Fixed**

- Errors thrown by update statements expose the correct statement arguments.


## 0.32.1

Released December 2, 2015

**Fixed**

- `DatabaseCollation` did incorrectly process strings provided by sqlite.


## 0.32.0

Released November 23, 2015

**New**

- `DatabaseCollation` let you inject custom string comparison functions into SQLite.
- `DatabaseValue` adopts Hashable.
- `DatabaseValue.isNull` is true if a database value is NULL.
- `DatabaseValue.storage` exposes the underlying SQLite storage (NULL, INTEGER, REAL, TEXT, BLOB).


## 0.31.0

Released November 19, 2015

**New**

- `DatabaseFunction` lets you define custom SQL functions.


## 0.30.0

Released November 17, 2015

**Fixed**

- Prepared statements won't execute unless their arguments are all set.


## 0.29.0

Released November 14, 2015

**New**

- `DatabaseValue.init?(object: AnyObject)` initializer.
- `StatementArguments.Default` is the preferred sentinel for functions that have an optional arguments parameter.


**Breaking Changes**

- `Row.init?(dictionary: NSDictionary)` is now a failable initializer which returns nil if the NSDictionary contains invalid values.
- `RowConvertible.init?(dictionary: NSDictionary)` is now a failable initializer which returns nil if the NSDictionary contains invalid values.
- `StatementArguments.init?(_ array: NSArray)` is now a failable initializer which returns nil if the NSArray contains invalid values.
- `StatementArguments.init?(_ dictionary: NSDictionary)` is now a failable initializer which returns nil if the NSDictionary contains invalid values.
- All methods that used to have an `StatementArguments?` parameter with nil default value now have a non-optional `StatementArguments` parameter with `StatementArguments.Default` as a default value. This makes sure failable StatementArguments initializers don't let invalid inputs sneak in your queries.


## 0.28.0

Released November 13, 2015

**Breaking Change**

- The methods of protocol `TransactionObserverType` are no longer optional.


## 0.27.0

Released November 4, 2015

**New**

- `DatabaseCoder` reads and stores objects that conform to NSCoding in the database.
- `Database.inTransaction()` executes a block inside a database transaction.
- `DatabaseMigrator.registerMigrationWithoutForeignKeyChecks()` let you make arbitrary changes to the database schema, as described at https://www.sqlite.org/lang_altertable.html#otheralter.


**Breaking Changes**

- `Record.delete` returns a Bool which tells whether a database row was deleted or not.


## 0.26.1

Released October 31, 2015

**Fixed repository mess introduced by 0.26.0**


## 0.26.0

Released October 31, 2015

**Breaking Changes**

- The `fetch(:primaryKeys:)`, `fetchAll(:primaryKeys:)` and `fetchOne(:primaryKey:)` methods have been renamed `fetch(:keys:)`, `fetchAll(:keys:)` and `fetchOne(:key:)`.


## 0.25.0

Released October 29, 2015

**Fixed**

- `Record.reload(_)` is no longer a final method.
- GRDB always crashes when you try to convert a database NULL to a non-optional value.


**New**

- CGFloat can be stored and read from the database.
- `Person.fetch(_:primaryKeys:)` returns a sequence of objects with matching primary keys.
- `Person.fetchAll(_:primaryKeys:)` returns an array of objects with matching primary keys.
- `Person.fetch(_:keys:)` returns a sequence of objects with matching keys.
- `Person.fetchAll(_:keys:)` returns an array of objects with matching keys.


## 0.24.0

Released October 14, 2015

**Fixed**

- Restored iOS 7 compatibility


## 0.23.0

Released October 13, 2015

**New**

- `Row()` initializes an empty row.

**Breaking Changes**

- NSData is now the canonical type for blobs. The former intermediate `Blob` type has been removed.
- `DatabaseValue.dataNoCopy()` has turned useless, and has been removed.


## 0.22.0

Released October 8, 2015

**New**

- `Database.sqliteConnection`: the raw SQLite connection, suitable for SQLite C API.
- `Statement.sqliteStatement`: the raw SQLite statement, suitable for SQLite C API.


## 0.21.0

Released October 1, 2015

**Fixed**

- `RowConvertible.awakeFromFetch(_)` is declared as `mutating`.


**New**

- Improved value extraction errors.

- `Row.hasColumn(_)`

- `RowConvertible` and `Record` get a dictionary initializer for free:

    ```swift
    class Person: Record { ... }
    let person = Person(dictionary: ["name": "Arthur", "birthDate": nil])
    ```

- Improved Foundation support:
    
    ```swift
    Row(dictionary: NSDictionary)
    Row.toDictionary() -> NSDictionary
    ```

- Int32 and Int64 enums are supported via DatabaseInt32Representable and DatabaseInt64Representable.


**Breaking Changes**

- `TraceFunction` is now defined as `(String) -> ()`


## 0.20.0

Released September 29, 2015

**New**

- Support for NSURL

**Breaking Changes**

- The improved TransactionObserverType protocol lets adopting types modify the database after a successful commit or rollback, and abort a transaction with an error.


## 0.19.0

Released September 28, 2015

**New**

- The `Configuration.transactionObserver` lets you observe database changes.


## 0.18.0

Released September 26, 2015

**Fixed**

- It is now mandatory to provide values for all arguments of an SQL statement. GRDB used to assume NULL for missing ones.

**New**

- `Row.dataNoCopy(atIndex:)` and `Row.dataNoCopy(named:)`.
- `Blob.dataNoCopy`
- `DatabaseValue.dataNoCopy`

**Breaking Changes**

- `String.fetch...` now returns non-optional values. Use `Optional<String>.fetch...` when values may be NULL.


## 0.17.0

Released September 24, 2015

**New**

- Performance improvements.
- You can extract non-optional values from Row and DatabaseValue.
- Types that adopt SQLiteStatementConvertible on top of the DatabaseValueConvertible protocol are granted with faster database access.

**Breaking Changes**

- Rows can be reused during a fetch query iteration. Use `row.copy()` to keep one.
- Database sequences are now of type DatabaseSequence.
- Blob and NSData relationships are cleaner.


## 0.16.0

Released September 14, 2015

**New**

- `Configuration.busyMode` let you specify how concurrent connections should handle database locking.
- `Configuration.transactionType` let you specify the default transaction type.

**Breaking changes**

- Default transaction type has changed from EXCLUSIVE to IMMEDIATE.


## 0.15.0

Released September 12, 2015

**Fixed**

- Usage assertions used to be disabled. They are activated again.

**Breaking changes**

- `DatabaseQueue.inDatabase` and `DatabaseQueue.inTransaction` are no longer reentrant.


## 0.14.0

Released September 12, 2015

**Fixed**

- `DatabaseQueue.inTransaction()` no longer crashes when SQLite returns a SQLITE_BUSY error code.

**Breaking changes**

- `Database.updateStatement(_:)` is no longer a throwing method.
- `DatabaseQueue.inTransaction()` is now declared as `throws`, not `rethrows`.


## 0.13.0

Released September 10, 2015

**New**

- `DatabaseQueue.inDatabase` and `DatabaseQueue.inTransaction` are now reentrant. You can't open a transaction inside another, though.
- `Record.copy()` returns a copy of the receiver.
- `Row[columnName]` and `Row.value(named:)` are now case-insensitive.

**Breaking changes**

- Requires Xcode 7.0 (because of [#2](https://github.com/groue/GRDB.swift/issues/2))
- `RowModel` has been renamed `Record`.
- `Record.copyDatabaseValuesFrom` has been removed in favor of `Record.copy()`.
- `Record.awakeFromFetch()` now takes a row argument.


## 0.12.0

Released September 6, 2015

**New**

- `RowConvertible` and `DatabaseTableMapping` protocols grant any type the fetching methods that used to be a privilege of `RowModel`.
- `Row.columnNames` returns the names of columns in the row.
- `Row.databaseValues` returns the database values in the row.
- `Blob.init(bytes:length:)` is a new initializer.
- `DatabaseValueConvertible` can now be adopted by non-final classes.
- `NSData`, `NSDate`, `NSNull`, `NSNumber` and `NSString` adopt `DatabaseValueConvertible` and can natively be stored and fetched from a database.

**Breaking changes**

- `DatabaseDate` has been removed (replaced by built-in NSDate support).
- `DatabaseValueConvertible`: `init?(dbValue:)` has been replaced by `static func fromDatabaseValue(_:) -> Self?`
- `Blob.init(_:)` has been replaced with `Blob.init(data:)` and `Blob.init(dataNoCopy:)`.
- `RowModel.edited` has been renamed `RowModel.databaseEdited`.
- `RowModel.databaseTable` has been replaced with `RowModel.databaseTableName()` which returns a String.
- `RowModel.setDatabaseValue(_:forColumn:)` has been removed. Use and override `RowModel.updateFromRow(_:)` instead.
- `RowModel.didFetch()` has been renamed `RowModel.awakeFromFetch()`


## 0.11.0

Released September 4, 2015

**Breaking changes**

The fetching methods are now available on the fetched type themselves:

```swift
dbQueue.inDatabase { db in
    Row.fetch(db, "SELECT ...", arguments: ...)        // AnySequence<Row>
    Row.fetchAll(db, "SELECT ...", arguments: ...)     // [Row]
    Row.fetchOne(db, "SELECT ...", arguments: ...)     // Row?
    
    String.fetch(db, "SELECT ...", arguments: ...)     // AnySequence<String?>
    String.fetchAll(db, "SELECT ...", arguments: ...)  // [String?]
    String.fetchOne(db, "SELECT ...", arguments: ...)  // String?
    
    Person.fetch(db, "SELECT ...", arguments: ...)     // AnySequence<Person>
    Person.fetchAll(db, "SELECT ...", arguments: ...)  // [Person]
    Person.fetchOne(db, "SELECT ...", arguments: ...)  // Person?
}
```


## 0.10.0

Released September 4, 2015

**New**

- `DatabaseValue` adopts `DatabaseValueConvertible`: a fetched value can be used as an argument of another query, without having to convert the raw database value into a regular Swift type.
- `Row.init(dictionary)` lets you create a row from scratch.
- `RowModel.didFetch()` is an overridable method that is called after a RowModel has been fetched or reloaded.
- `RowModel.updateFromRow(row)` is an overridable method that helps updating compound properties that do not fit in a single column, such as CLLocationCoordinate2D.


## 0.9.0

Released August 25, 2015

**Fixed**

- Reduced iOS Deployment Target to 8.0, and macOS Deployment Target to 10.9.
- `DatabaseQueue.inTransaction()` is now declared as `rethrows`.

**Breaking changes**

- Requires Xcode 7 beta 6
- `QueryArguments` has been renamed `StatementArguments`.


## 0.8.0

Released August 18, 2015

**New**

- `RowModel.exists(db)` returns whether a row model has a matching row in the database.
- `Statement.arguments` property gains a public setter.
- `Database.executeMultiStatement(sql)` can execute several SQL statements separated by a semi-colon ([#6](https://github.com/groue/GRDB.swift/pull/6) by [peter-ss](https://github.com/peter-ss))

**Breaking changes**

- `UpdateStatement.Changes` has been renamed `DatabaseChanges` ([#6](https://github.com/groue/GRDB.swift/pull/6) by [peter-ss](https://github.com/peter-ss)).


## 0.7.0

Released July 30, 2015

**New**

- `RowModel.delete(db)` returns whether a database row was deleted or not.

**Breaking changes**

- `RowModelError.InvalidPrimaryKey` has been replaced by a fatal error.


## 0.6.0

Released July 30, 2015

**New**

- `DatabaseDate` can read dates stored as Julian Day Numbers.
- `Int32` can be stored and fetched.


## 0.5.0

Released July 22, 2015

**New**

- `DatabaseDate` handles storage of NSDate in the database.
- `DatabaseDateComponents` handles storage of NSDateComponents in the database.

**Fixed**

- `RowModel.save(db)` calls `RowModel.insert(db)` or `RowModel.update(db)` so that eventual overridden versions of `insert` or `update` are invoked.
- `QueryArguments(NSArray)` and `QueryArguments(NSDictionary)` now accept NSData elements.

**Breaking changes**

- "Bindings" has been renamed "QueryArguments", and `bindings` parameters renamed `arguments`.
- Reusable statements no longer expose any setter for their `arguments` property, and no longer accept any arguments in their initializer. To apply arguments, give them to the `execute()` and `fetch()` methods.
- `RowModel.isEdited` and `RowModel.setEdited()` have been replaced by the `RowModel.edited` property.


## 0.4.0

Released July 12, 2015

**Fixed**

- `RowModel.save(db)` makes its best to store values in the database. In particular, when the row model has a non-nil primary key, it will insert when there is no row to update. It used to throw RowModelNotFound in this case.


## v0.3.0

Released July 11, 2015

**New**

- `Blob.init?(NSData?)`

    Creates a Blob from NSData. Returns nil if and only if *data* is nil or zero-length (SQLite can't store empty blobs).

- `RowModel.isEdited`

    A boolean that indicates whether the row model has changes that have not been saved.

    This flag is purely informative: it does not alter the behavior the update() method, which executes an UPDATE statement in every cases.

    But you can prevent UPDATE statements that are known to be pointless, as in the following example:

    ```swift
    let json = ...

    // Fetches or create a new person given its ID:
    let person = Person.fetchOne(db, primaryKey: json["id"]) ?? Person()

    // Apply json payload:
    person.updateFromJSON(json)

    // Saves the person if it is edited (fetched then modified, or created):
    if person.isEdited {
        person.save(db) // inserts or updates
    }
    ```

- `RowModel.copyDatabaseValuesFrom(_:)`

    Updates a row model with values of another one.

- `DatabaseValue` adopts Equatable.

**Breaking changes**

- `RowModelError.UnspecifiedTable` and `RowModelError.InvalidDatabaseDictionary` have been replaced with fatal errors because they are programming errors.

## v0.2.0

Released July 9, 2015

**Breaking changes**

- Requires Xcode 7 beta 3

**New**

- `RowModelError.InvalidDatabaseDictionary`: new error case that helps you designing a fine RowModel subclass.


## v0.1.0

Released July 9, 2015

Initial release