触发器 索引视图 游标 事务

触发器

create trigger tr_banj_insert
on t_banj

after insert
as
begin

declare @log varchar(50)

select @log='插入的记录：banj_mc=' +banj_mc+'banzr='+banzr from inserted  --新数据
insert into t_log (biaomc,caoznr) values('t_banj',@log)

end


create trigger tr_banj_delete

on t_banj

after delete

as

begin

delete @log varchar(50)

select*from deleted --旧的数据

select @log='删除的记录：' +cast()+'banzr='+banzr from inserted 
end

索引  视图

--创建索引 根据查询条件来建立
create index ind_xuns_xunh on dbo.t_xuns
(xunh)

select * from t_xuns where banj_id=1

--创建视图   
create view v_st
as
select * from t_xuns


drop index  view 

游标
--定义游标
declare @banjid varchar(30)

declare @banjmc varchar(30)

--forward游标向前  scroll滚动的 

declare  cur cursor  scroll dynamic for select banj_id,banj_mc from t_banj 


--打开游标
open cur

fetch next from cur into @banjid,@banjmc

while @@FETCH_STATUS=0--判断是否取到数据

begin

fetch next from cur into @banjid,@banjmc

print('@banjid='+@banjid +'@banjmc'+@banjmc)


end
--关闭游标
close cur

--释放游标
deallocate cur

事务

--启动事务
begin tran t1 

delete t_log where log_id=1   --转出钱操作

delete t_xuns where xueh ='201501'--转出钱的操作

--全局变量 

if @@ERROR<>0
rollback tran t1

else

--提交事务

commit tran t1