这个查询有什么问题? [英] What wrong with this query ?
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问题描述
CREATE PROC [dbo].[pr__SYS_MakeUpdateRecordProc]
@sTableName varchar(128),
@bExecute bit = 1
AS
DECLARE @sProcText varchar(8000),
@sKeyFields varchar(2000),
@sSetClause varchar(2000),
@sWhereClause varchar(2000),
@sColumnName varchar(128),
@nColumnID smallint,
@bPrimaryKeyColumn bit,
@nAlternateType int,
@nColumnLength int,
@nColumnPrecision int,
@nColumnScale int,
@IsNullable bit,
@IsIdentity int,
@sTypeName varchar(128),
@sDefaultValue varchar(4000),
@sCRLF char(2),
@sTAB char(1)
SET @sTAB = char(9)
SET @sCRLF = char(13) + char(10)
SET @sProcText = ''
SET @sKeyFields = ''
SET @sSetClause = ''
SET @sWhereClause = ''
SET @sProcText = @sProcText + 'IF EXISTS(SELECT * FROM sysobjects WHERE name = ''SP_' + @sTableName + 'Update'')' + @sCRLF
SET @sProcText = @sProcText + @sTAB + 'DROP PROC SP_' + @sTableName + 'Update' + @sCRLF
IF @bExecute = 0
SET @sProcText = @sProcText + 'GO' + @sCRLF
SET @sProcText = @sProcText + @sCRLF
PRINT @sProcText
IF @bExecute = 1
EXEC (@sProcText)
SET @sProcText = ''
SET @sProcText = @sProcText + '----------------------------------------------------------------------------' + @sCRLF
SET @sProcText = @sProcText + '-- Update a single record in ' + @sTableName + @sCRLF
SET @sProcText = @sProcText + '----------------------------------------------------------------------------' + @sCRLF
SET @sProcText = @sProcText + 'CREATE PROC SP_' + @sTableName + 'Update' + @sCRLF
DECLARE crKeyFields cursor for
SELECT *
FROM dbo.fnTableColumnInfo(@sTableName)
ORDER BY 2
OPEN crKeyFields
FETCH NEXT
FROM crKeyFields
INTO @sColumnName, @nColumnID, @bPrimaryKeyColumn, @nAlternateType,
@nColumnLength, @nColumnPrecision, @nColumnScale, @IsNullable,
@IsIdentity, @sTypeName, @sDefaultValue
WHILE (@@FETCH_STATUS = 0)
BEGIN
IF (@sKeyFields <> '')
SET @sKeyFields = @sKeyFields + ',' + @sCRLF
SET @sKeyFields = @sKeyFields + @sTAB + '@' + @sColumnName + ' ' + @sTypeName
IF (@nAlternateType = 2) --decimal, numeric
SET @sKeyFields = @sKeyFields + '(' + CAST(@nColumnPrecision AS varchar(3)) + ', '
+ CAST(@nColumnScale AS varchar(3)) + ')'
ELSE IF (@nAlternateType = 1) --character and binary
SET @sKeyFields = @sKeyFields + '(' + CAST(@nColumnLength AS varchar(4)) + ')'
IF (@bPrimaryKeyColumn = 1)
BEGIN
IF (@sWhereClause = '')
SET @sWhereClause = @sWhereClause + 'WHERE '
ELSE
SET @sWhereClause = @sWhereClause + ' AND '
SET @sWhereClause = @sWhereClause + @sTAB + @sColumnName + ' = @' + @sColumnName + @sCRLF
END
ELSE
IF (@IsIdentity = 0)
BEGIN
IF (@sSetClause = '')
SET @sSetClause = @sSetClause + 'SET'
ELSE
SET @sSetClause = @sSetClause + ',' + @sCRLF
SET @sSetClause = @sSetClause + @sTAB + @sColumnName + ' = '
IF (@sTypeName = 'timestamp')
SET @sSetClause = @sSetClause + 'NULL'
ELSE IF (@sDefaultValue IS NOT NULL)
SET @sSetClause = @sSetClause + 'COALESCE(@' + @sColumnName + ', ' + @sDefaultValue + ')'
ELSE
SET @sSetClause = @sSetClause + '@' + @sColumnName
END
IF (@IsIdentity = 0)
BEGIN
IF (@IsNullable = 1) OR (@sTypeName = 'timestamp')
SET @sKeyFields = @sKeyFields + ' = NULL'
END
FETCH NEXT
FROM crKeyFields
INTO @sColumnName, @nColumnID, @bPrimaryKeyColumn, @nAlternateType,
@nColumnLength, @nColumnPrecision, @nColumnScale, @IsNullable,
@IsIdentity, @sTypeName, @sDefaultValue
END
CLOSE crKeyFields
DEALLOCATE crKeyFields
SET @sSetClause = @sSetClause + @sCRLF
SET @sProcText = @sProcText + @sKeyFields + @sCRLF
SET @sProcText = @sProcText + 'AS' + @sCRLF
SET @sProcText = @sProcText + @sCRLF
SET @sProcText = @sProcText + 'UPDATE ' + @sTableName + @sCRLF
SET @sProcText = @sProcText + @sSetClause
SET @sProcText = @sProcText + @sWhereClause
SET @sProcText = @sProcText + @sCRLF
IF @bExecute = 0
SET @sProcText = @sProcText + 'GO' + @sCRLF
PRINT @sProcText
IF @bExecute = 1
EXEC (@sProcText)
GO
When i execute :
exec pr__SYS_MakeUpdateRecordProc 'Menu', 1, 'michael'
i get error like this :
Msg 272, Level 16, State 1, Procedure SP_MenuUpdate, Line 21
Cannot update a timestamp column.
我尝试过:
i不知道我要做什么..
i不知道为什么会发生错误..
请帮我朋友....
What I have tried:
i dont know what i to do..
i dont know why its happen error..
please help me friend....
推荐答案
MSDN:timestamp(Transact- SQL) [ ^ ]
MSDN: timestamp (Transact-SQL)[^]
Quote:
。时间戳数据类型只是一个递增的数字,不保留日期或时间。要记录日期或时间,请使用日期时间数据类型。
. The timestamp data type is just an incrementing number and does not preserve a date or a time. To record a date or time, use a datetime data type.
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