黑马视频-触发器

create trigger tbl_TblClass_insert_after
on TblClass after insert
as
begin
 declare @id int,
 declare @name varchar(50),
 declare @desc varchar(50)
 select @id=tClassId ,@name=tclassName,@desc=ClassDesc from inserted
 print @id
 print @name
 print @desc
end
--测试
insert into TblClass values(‘班级名称‘,‘班级描述‘)

create trigger tri_TblClass_delete_after
on TblClass after delete[,insert]
as 
begin 
 insert into TblClass_Bak select * from deleted
end

create trriger tri_TblClass_delete_instead_of
on TblClass instead of delete
as 
begin
 insert into TblClassBak select * from deleted
end
--使用 instead of 触发器后，原来删除操作被 insert into TblClassBak