关于触发器递归死循环的有关问题
日期：2014-05-18 浏览次数：20671 次
关于触发器递归死循环的问题
CREATE TRIGGER delfiled on tablename1 FOR DELETE
AS
declare @id int,@ename varchar(50),@strdrop varchar(200)
select @id=id from deleted
select @ename=ename from deleted
delete from tablename1 where fatherid=@id
set @strdrop='alter table tablename2 drop column '+@ename+''
exec (@strdrop)
这个触发器产生了死循环，怎样修改才能避免此循环，谢谢
------解决方案--------------------
CREATE TRIGGER delfiled on tablename1 FOR DELETE
AS
declare @id int,@ename varchar(50),@strdrop varchar(200)
select @id=id from deleted
select @ename=ename from deleted
delete from tablename1 where fatherid=@id
set @strdrop='alter table tablename2 drop column '+@ename+''
exec (@strdrop)
这个触发器产生了死循环，怎样修改才能避免此循环，谢谢
------解决方案--------------------
- SQL code
CREATE TRIGGER delfiled on tablename1 FOR DELETE
AS
IF @@ROWCOUNT = 0
RETURN
declare @id int,@ename varchar(50),@strdrop varchar(200)
select @id=id from deleted
select @ename=ename from deleted
delete from tablename1 where fatherid=@id
set @strdrop= 'alter table tablename2 drop column '+@ename+ ' '
exec (@strdrop)
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