案例------触发器

insert 触发器示例

create trigger tri_insert

on student

for insert

as

declare @student_id char(10)

select @student_id=s.student_id from

student s inner join inserted i

on s.student_id=i.student_id

if @student_id='0000000001'

begin

raiserror('不能插入1的学号!',16,8)

rollback tran

end

go

update触发器示例

create trigger tri_update

on student

for update

as

if update(student_id)

begin

raiserror('学号不能修改!',16,8)

rollback tran

end

go

delete触发器示例

create trigger tri_delete

on student

for delete

as

declare @student_id varchar(10)

select @student_id=student_id from deleted

if @student_id='admin'

begin

raiserror('错误',16,8)

rollback tran

end