[转帖]触发器FAQ

时　间:2009-02-13 08:31:19
作　者:郑家龙   ID：90  城市：上海
摘　要:[转帖]触发器FAQ
正　文:

问题：有两个表，结构基本相同。想在表1中增加、删除、更新数据时，同时更新表2。

思路：在表1上建立一个触发器，然后在触发器中将新增加的数据项(有UID类型、INT类型、BIT类型、VCHAR类型、TEXT类型等等)，做处理后，再INSERT到表2中。删除与更新的思路相同。

请问：怎么做这样子的触发器？最好有示范代码。

回复1 如下: CREATE TRIGGER [Delete_Employee] ON dbo.Employee FOR DELETE AS delete from Salary from deleted Where Salary.depid=deleted.depid and salary.id=deleted.id CREATE TRIGGER [Insert_Employee] ON dbo.Employee FOR INSERT AS Insert into Salary(DepID,ID,Name,Status) Select DepID,ID,Name,Status from Inserted CREATE TRIGGER [Update Employee] ON dbo.Employee FOR UPDATE AS Update Salary Set Salary.ID=Inserted.ID, Salary.DepID=Inserted.DepID, Salary.Name=Inserted.Name,Salary.Status=Inserted.Status From Inserted,deleted Where deleted.DepID=salary.depid and deleted.id=salary.id

回复2 CREATE TRIGGER 触发器名 ON 表1 FOR INSERT,UPDATE,DELETE AS BEGIN IF （SELECT count(*) FROM deleted）>0 BEGIN DELETE 表2 FROM 表2,deleted WHERE 表2.主键=deleted.主键 IF @@error<>0 GOTO error END IF （SELECT count(*) FROM inserted）>0 BEGIN INSERT 表2 （数据列） SELECT 数据列 FROM inserted IF @@error<>0 GOTO error END RETURN error: ROLLBACK TRANSACTION RETURN END