触发器.txt

设备管理软件,包括一般设备管理和固定资产管理(验收/调拨/报废/保养/维护/维修)

--insert 触发器 
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 
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 
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