怎么在SQL Server中利用Delete操作回滚日志？很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。
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CREATE PROCEDURE [dbo].[SP_DELETE_LOG]
@TABLENAME VARCHAR(50)
AS
BEGIN
SET NOCOUNT ON;
IF NOT EXISTS(SELECT * FROM sys.tables WHERE NAME = @TABLENAME AND TYPE = 'U' )
BEGIN
PRINT'ERROR：not exist table '+@TABLENAME
RETURN
END
IF (@TABLENAME LIKE'BACKUP_%' OR @TABLENAME='UPDATE_LOG' )
BEGIN
--PRINT'ERROR：not exist table '+@TABLENAME
RETURN
END
--================================判断是否存在 UPDATE_LOG 表============================
IF NOT EXISTS(SELECT * FROM sys.tables WHERE NAME = 'UPDATE_LOG' AND TYPE = 'U')
CREATE TABLE UPDATE_LOG
(
UpdateGUID VARCHAR(36),
UpdateTime DATETIME,
TableName varchar(20),
UpdateType varchar(6),
RollBackSQL varchar(1000)
)
--=================================判断是否存在 BACKUP_ 表================================
IF NOT EXISTS(SELECT * FROM sys.tables WHERE NAME = 'BACKUP_'+@TABLENAME AND TYPE = 'U')
BEGIN
--DECLARE @SQL VARCHAR(500)
--SET @SQL='SELECT TOP 1 NEWID() AS [UpdateGUID],* INTO BACKUP_'+@TABLENAME+' FROM '+ @TABLENAME+'
-- DELETE FROM BACKUP_'+@TABLENAME
--SELECT @SQL
--EXEC(@SQL)
DECLARE test_Cursor CURSOR FOR
SELECT COLUMN_NAME,DATA_TYPE,CHARACTER_MAXIMUM_LENGTH FROM INFORMATION_SCHEMA.columns
WHERE TABLE_NAME=@TABLENAME
OPEN test_Cursor
DECLARE @SQLTB NVARCHAR(MAX)=''
DECLARE @COLUMN_NAME NVARCHAR(50),@DATA_TYPE VARCHAR(20),@CHARACTER_MAXIMUM_LENGTH INT
FETCH NEXT FROM test_Cursor INTO @COLUMN_NAME,@DATA_TYPE,@CHARACTER_MAXIMUM_LENGTH
WHILE @@FETCH_STATUS=0
BEGIN
SET @SQLTB=@SQLTB+'['+@COLUMN_NAME+'] '+@DATA_TYPE+CASE ISNULL(@CHARACTER_MAXIMUM_LENGTH,0) WHEN 0 THEN '' WHEN -1 THEN '(MAX)' ELSE'('+CAST(@CHARACTER_MAXIMUM_LENGTH AS VARCHAR(10))+')' END+','
FETCH NEXT FROM test_Cursor INTO @COLUMN_NAME,@DATA_TYPE,@CHARACTER_MAXIMUM_LENGTH
END
SET @SQLTB='CREATE TABLE BACKUP_'+@TABLENAME+' (UpdateGUID varchar(36),'+SUBSTRING(@SQLTB,1,LEN(@SQLTB)-1)+')'
EXEC (@SQLTB)
CLOSE test_Cursor
DEALLOCATE test_Cursor
END
--======================================判断是否存在 DELETE 触发器=========================
IF NOT EXISTS(SELECT * FROM sys.objects WHERE NAME = 'tg_'+@TABLENAME+'_Delete' AND TYPE = 'TR')
BEGIN
DECLARE @SQLTR NVARCHAR(MAX)
SET @SQLTR='
CREATE TRIGGER tg_'+@TABLENAME+'_Delete
ON '+@TABLENAME+'
AFTER delete
AS
BEGIN
SET NOCOUNT ON;
--==============================获取GUID==========================================
DECLARE @NEWID VARCHAR(36)=NEWID()
--==============================将删掉的数据插入备份表============================
INSERT INTO [dbo].[BACKUP_'+@TABLENAME+']
SELECT @NEWID,* FROM deleted
--==============================记录日志和回滚操作的SQL===========================
--*********************生成列名**********************
DECLARE @COLUMN NVARCHAR(MAX)=''''
SELECT @COLUMN+='',[''+COLUMN_NAME+'']'' FROM INFORMATION_SCHEMA.columns
WHERE TABLE_NAME='''+@TABLENAME+'''
AND COLUMNPROPERTY(OBJECT_ID('''+@TABLENAME+'''),COLUMN_NAME,''IsIdentity'')<>1 --非自增字段
SET @COLUMN=SUBSTRING(@COLUMN,2,LEN(@COLUMN))
INSERT INTO [dbo].[UPDATE_LOG]
SELECT @NEWID,GETDATE(),'''+@TABLENAME+''',''DELETE'',''INSERT INTO '+@TABLENAME+' SELECT ''+@COLUMN+'' FROM BACKUP_'+@TABLENAME+' WHERE UPDATEGUID=''''''+@NEWID+''''''''
END
'
EXEC(@SQLTR)
END
END接着我们新建一张测试表，并且随便往表中插入两组数据：
Create table test
(
id int,
name varchar(10),
msg varchar(10)
)
Insert into test
Select 1,'aa','hahah'
Union all
Select 2,'bb','heihei'下面执行这个SP,在给test表添加回滚日志：
EXEC SP_DELETE_LOG 'test'细心的你不难发现，这时候数据库里面应该会多出两张表：
然后我们删掉一条数据：
DELETE FROM test WHERE id=1再查看那两张表：
没错，这时候日志表里有数据了，然后我们把 UPDATE_LOG 表中的 RollBackSQ L这一列对应的值copy出来执行一下：
INSERT INTO test SELECT [id],[name],[msg] FROM BACKUP_test WHERE UPDATEGUID='B0CBBC4F-3432-4D4F-9E17-F17209BF6745'看完上述内容是否对您有帮助呢？如果还想对相关知识有进一步的了解或阅读更多相关文章，请关注亿速云行业资讯频道，感谢您对亿速云的支持。
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