动态为表添加存储时间字段

实现动态化，为表添加存储时间字段，Insus.NET写一个存储过程，如下

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

-- =============================================
-- Author:      Insus.NET
-- Blog:        https://insus.cnblogs.com
-- Create date: 2019-05-29
-- Update date: 2019-05-29
-- Description: 动态为表添加存储时间字段
-- =============================================
CREATE PROCEDURE [dbo].[usp_DyanmicallyAddStorageDatetimeField]
(
    @TABLE_CATALOG SYSNAME,
    @TABLE_SCHEMA SYSNAME,
    @TABLE_NAME SYSNAME,    
    @COLUMNs NVARCHAR(MAX) -- '[column1],[column2],[column3]...'
)
AS
BEGIN
    DECLARE @source TABLE ([ID] INT IDENTITY(1,1), [value] NVARCHAR(MAX))
    INSERT INTO @source ([value]) SELECT [value] FROM [dbo].[tvf_ConvertStringToTable](@COLUMNs,',')
    DECLARE @r INT = 1,@rs INT = 0 
    SELECT @rs = MAX([ID]) FROM @source

    WHILE @r <= @rs
    BEGIN        
        DECLARE @COLUMN_NAME SYSNAME
        SELECT @COLUMN_NAME = CONVERT(VARCHAR(30), [value], 23) FROM @source WHERE [ID] = @r    

        EXECUTE('IF [dbo].[usp_IsExistsColumn]('''+ @TABLE_CATALOG +''','''+ @TABLE_SCHEMA +''','''+ @TABLE_NAME +''','''+ @COLUMN_NAME +''') = 0 ALTER TABLE '+ @TABLE_NAME +' ADD '+ @COLUMN_NAME +' DATETIME')

        SET @r= @r + 1
    END
END

上面存储过程代码#54行中有一个定义函数：[dbo].[tvf_ConvertStringToTable]()

是分割字符串转为表。函数详细代码参考这篇《展开中断或忽略的序号》https://www.cnblogs.com/insus/p/10929956.html

还有一个自定义函数：[dbo].[usp_IsExistsColumn]()这是判断表的列是否存在。

参考：《判断列名是否存在》https://www.cnblogs.com/insus/p/10943356.html

接下来，Insus.NET演示这个存储过程[dbo].[usp_DyanmicallyAddStorageDatetimeField]：

IF OBJECT_ID('tempdb..#TempRpt') IS NOT NULL DROP TABLE #TempRpt   
CREATE TABLE #TempRpt
(   
    [caseno] bigint,
    [username] nvarchar(20)
)        


EXECUTE [dbo].[usp_DyanmicallyAddStorageDatetimeField] 'tempdb','dbo','#TempRpt','[column1],[column2],[column3]'    

SELECT * FROM #TempRpt