表
表名:属性表二
DELETE (AFTER)触发器
格式:
CREATE TRIGGER 触发器名
ON 表名
AFTER DELETE
AS
BEGIN
DECLARE @A(参数) INT
SELECT @A=DELETED.列名 FROM DELETED
DELETE 表名
where 条件
END
例:
CREATE TRIGGER chufaqi
ON [dbo].[属性表二]
AFTER DELETE
AS
BEGIN
DECLARE @A INT
SELECT @A=DELETED.ID FROM DELETED
DELETE 属性表
where id=@A
END
意思为如果删除id列的某一值,则会直接删除这一行的所有值
做DELETE 操作
执行SQL
INSTEAD OF 触发器
例:
CREATE TRIGGER chufaqi2
ON [dbo].[属性表二]
INSTEAD OF DELETE
AS
BEGIN
DECLARE @B INT
SELECT @B=COUNT(*) FROM DELETED
IF @B>0
BEGIN
RAISERROR ('不能删除',10,1)
rollback transaction
end
end
不允许进行删除操作的触发器
結果:
触发器的删除
格式:
DROP TRIGGER 触发器名