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判断触发器正在处理的是插入,删除还是更新触发 - 站长搜索
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判断触发器正在处理的是插入,删除还是更新触发

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2022-09-23 17:07:51 转载来源: 网络整理/侵权必删

但是有时候,可以视看处进逻辑程度,可以把三者写成一个触发器,只是在其中稍作判断而已。你可以根据从下面方法判断触发器是是处理了插入,删除还是更新触发的:复制代码代码如下:--宣告两个变量DECLARE@DBIT=0DECLARE@IBIT=0--如果在DELETED内部临时触发表找到记录,说明旧数据被删除IFEXISTS(SELECTTOP11FROMDELETED)SET@D=1--如果在INSERTED内部临时触发表找到记录,说明有新数据插入IFEXISTS(SELECTTOP11FROMINSERTED)SET@I=1--如果两个表都有记录,说明触发器是执行更新触发IF@I=1AND@D=1PRINT(N'更新

但是有时候,可以视看处进逻辑程度,可以把三者写成一个触发器,只是在其中稍作判断而已。

你可以根据从下面方法判断触发器是是处理插入删除还是更新触发的:

复制代码 代码如下:

--宣告两个变量
DECLARE @D BIT = 0
DECLARE @I BIT = 0

--如果在DELETED内部临时触发表找到记录,说明旧数据被删除
IF EXISTS(SELECT TOP 1 1 FROM DELETED)
SET @D = 1

--如果在INSERTED内部临时触发表找到记录,说明有新数据插入
IF EXISTS(SELECT TOP 1 1 FROM INSERTED)
SET @I = 1

--如果两个表都有记录,说明触发器是执行更新触发
IF @I = 1 AND @D = 1
PRINT(N'更新。')

--如果变量@I值被变更为1,而变量@D没有变更,说明触发器是执行插入触发
IF @I = 1 AND @D = 0
PRINT(N'插入')

--下面判断成立,说明说明触发器是执行删除触发
IF @I = 0 AND @D = 1
PRINT(N'删除')


另外有关两个内部临时触发表,触发器的Inserted表和Deleted表

触发器有两个虚拟表,Inserted表和Deleted表,这两个表在不同操作情况之下,表中的数据状态可不一样。
一、插入操作(INSERT)时:Inserted表有数据,Deleted表无数据。
二、更新操作(UPDATE)时:Inserted表有数据(新数据),Deleted表有数据(旧数据)。
三、删除操作(DELETE)时:Inserted表无数据,Deleted表有数据。

标签: 判断 触发器 正在 处理 插入 删除 还是 更新 触发


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