mongodb.md

Mongodb

• Mongodb
  • Atlas
  • Types
    • How to use Time in Mongodb
  • Orders

Atlas

DashBoard : https://cloud.mongodb.com/v2/619cd96f435b7205c0014abc#clusters

Types

How to use Time in Mongodb

There are three ways to express time:

1. 时间戳 timestamp
2. UTCDateTime
3. 日期字符串

Belows are some methods about time:

1. Date() : 'Wed Nov 24 2021 21:18:04 GMT+0800 (China Standard Time)' Beijing Time, the type is string
2. new Date(): 2021-11-24T13:18:25.287Z GMT Time, the type is object
3. ISODate(): 2021-11-24T13:18:25.287Z GMT Time, the type is object

Orders

1. switch db: use myNewDB
2. find all documents from collections: db.observations.find({})
3. find some documents with equal conditions: db.observations.find({"extra":"favorite"})
4. find some documents with greate or less conditions: db.observations.find({"observationTimestamp":{$gt:1637758459}})