From 059e8849ec6227572684ce39819d65864577410d Mon Sep 17 00:00:00 2001
From: Tomasz Jaskowski <tomasz.jaskowski@polcode.com>
Date: Mon, 10 Jan 2011 15:49:08 +0100
Subject: [PATCH] added support for NULL values in Sprig_Field_NativeTimestamp

---
 classes/sprig/field/nativetimestamp.php | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
 mode change 100644 => 100755 classes/sprig/field/nativetimestamp.php

diff --git a/classes/sprig/field/nativetimestamp.php b/classes/sprig/field/nativetimestamp.php
old mode 100644
new mode 100755
index 9a91b59..2ce53fa
--- a/classes/sprig/field/nativetimestamp.php
+++ b/classes/sprig/field/nativetimestamp.php
@@ -4,6 +4,7 @@
  *
  * @package    Sprig
  * @author     Marcus Cobden
+ * @author     Tomasz Jaskowski
  * @copyright  (c) 2010 Marcus Cobden
  * @license    MIT
  */
@@ -11,7 +12,11 @@ class Sprig_Field_NativeTimestamp extends Sprig_Field_Timestamp {
 
 	public function _database_wrap($value)
 	{
-		return new Database_Expression('FROM_UNIXTIME('. (int) $value . ')');
+		if ($value === null) {
+            return new Database_Expression('NULL');
+        } else {
+            return new Database_Expression('FROM_UNIXTIME('. (int) $value . ')');
+        }
 	}
 	
 	public function _database_unwrap($value)