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案例------触发器

2024-07-03 20:06:16   229人阅读

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


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