关于触发器递归死循环的有关问题
日期：2014-05-18 浏览次数：20541 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)
免责声明： 本文仅代表作者个人观点，与爱易网无关。其原创性以及文中陈述文字和内容未经本站证实，对本文以及其中全部或者部分内容、文字的真实性、完整性、及时性本站不作任何保证或承诺，请读者仅作参考，并请自行核实相关内容。
