数据库触发器基本知识

数据库触发器基本知识

 

触发器是自动的：它们在对表的数据作了任何修改（比如手工输入或者应用程序采取的操作）之后立即被激活。 

 

Java代码  

if exists(select * from sysobjects where name = 'Tbl_periodPara_Update_Trigger' )  

drop TRIGGER Tbl_periodPara_Update_Trigger  

GO  

  

create TRIGGER Tbl_periodPara_Update_Trigger  

on tbl_periodPara  

for update  

as RAISERROR ('Job id 1 expects the default level of 10.', 16, 1)  

GO    www.zzzyk.com  

  

update tbl_periodPara set iPeriod = 4 where strName = 'SysSamplePara'  

  

sp_helptrigger 'tbl_periodPara','update'  

  

select * from sysobjects where name = 'Tbl_periodPara_Update_Trigger'