如何在SQL Server数据库中将所有日期时间记录更新为UTC时间？

Question

我有一个包含~1000个表的SQL Server数据库.大多数表都有datetime不同名称的列.目前存储的值有偏移量,因为代码将其与服务器中的当前日期一起插入.

目标是以UTC时间记录所有日期时间记录.

现在我想做两件事:

1. 使用这3个函数中的一些(SYSDATETIME, SYSDATETIMEOFFSET, SYSUTCDATETIME)我可以获得偏移量.下一步是查找所有日期时间记录并更新它们.你能帮帮我吗？

2. 某些datetime列具有默认值GETTIME.我想用它来更新SYSUTCDATETIME.知道怎么样？

PS:我不想将列的类型更改为,datetimeoffset因为MSSQL Server 2005中不支持该类型.

编辑:因为有很多评论datetime,问题的主题在不同的方向转移,我建议你不要考虑datetime列类型,但为int.问题仍然存在.更新许多表并更改列的默认值.

最好的问候mynkow

Answer 1

动态SQL以更新服务器上的所有用户数据库.第一个查询输出到"结果"选项卡.第二个查询输出到"消息"选项卡.

SET NOCOUNT ON;
GO

---------------------------------------------
-- #1 Dynamic SQL to update DATETIME values with UTC offset
DECLARE @t TABLE(TABLE_CATALOG VARCHAR(128), TABLE_SCHEMA VARCHAR(128), TABLE_NAME VARCHAR(128), COLUMN_NAME VARCHAR(128));

INSERT @t
EXEC sp_msforeachdb 'select db = "?"
, s.name
, t.name
, c.name
FROM [?].sys.tables t
JOIN [?].sys.columns c ON c.object_id = t.object_id
JOIN [?].sys.types y ON y.user_type_id = c.user_type_id
JOIN [?].sys.schemas s ON s.schema_id = t.schema_id
WHERE t.[type] = ''U''
AND y.name = ''DATETIME''
AND "?" NOT IN (''master'', ''tempdb'', ''model'', ''msdb'')';

DECLARE @Offset INT;
SET @Offset = - DATEPART(TZOFFSET, SYSDATETIMEOFFSET());

SELECT [SQL] = 'UPDATE ['+ C.TABLE_CATALOG +'].[' + C.TABLE_SCHEMA + '].[' + C.TABLE_NAME + '] SET [' + C.COLUMN_NAME + '] = DATEADD(MINUTE,' + CAST(@Offset AS VARCHAR(5)) + ',[' + C.COLUMN_NAME + ']);' 
FROM @t C;
GO

---------------------------------------------
-- #2 Dynamic SQL to change DATETIME column defaults to SYSUTCDATETIME
DECLARE @t TABLE([SQL] VARCHAR(MAX));
DECLARE @SQL VARCHAR(MAX);

INSERT @t   
EXEC sp_msforeachdb 'SELECT [SQL] = ''---------------------------------------------'' + CHAR(13) + CHAR(10)
    + ''-- [?].[''+s.name+''].[''+t.name+''].['' + c.name + '']'' + CHAR(13) + CHAR(10)
    + ''ALTER TABLE [?].[''+s.name+''].[''+t.name+'']'' + CHAR(13) + CHAR(10)
    + ''DROP CONSTRAINT [''+d.name + '']'' + CHAR(13) + CHAR(10)
    + ''GO'' + CHAR(13) + CHAR(10)
    + ''ALTER TABLE [?].[''+s.name+''].[''+t.name+''] ADD CONSTRAINT'' + CHAR(13) + CHAR(10)
    + ''[''+d.name+''] DEFAULT (SYSUTCDATETIME()) FOR [''+c.name + '']'' + CHAR(13) + CHAR(10)
    + ''GO'' + CHAR(13) + CHAR(10) + CHAR(13) + CHAR(10)
    FROM [?].sys.default_constraints d
    JOIN [?].sys.columns c  ON  c.default_object_id = d.object_id
    JOIN [?].sys.types y ON y.user_type_id = c.user_type_id
    JOIN [?].sys.tables t ON t.object_id = d.parent_object_id AND t.[type] = ''U''
    JOIN [?].sys.schemas s ON s.schema_id = t.schema_id
    WHERE y.name = ''datetime''
    AND "?" NOT IN (''master'', ''tempdb'', ''model'', ''msdb'')';

DECLARE C CURSOR FOR 
SELECT * FROM @t

OPEN C
FETCH NEXT FROM C INTO @SQL;
WHILE @@FETCH_STATUS = 0 BEGIN
    PRINT @SQL;
    FETCH NEXT FROM C INTO @SQL;
END

CLOSE C;
DEALLOCATE C;
GO