本文實例講述了SQL Server觸發器和事務用法。分享給大家供大家參考，具體如下：
新增和刪除觸發器
alter trigger tri_TC on t_c for INSERT,deleteasbegin set XACT_ABORT ON declare @INSERTCOUNT int; declare @DELETECOUNT int; declare @UPDATECOUNT int; set @INSERTCOUNT = (select COUNT(*) from inserted); set @DELETECOUNT = (select COUNT(*) from deleted); set @UPDATECOUNT = () if(@INSERTCOUNT > 0) begin insert into t_c2 select * from inserted; end else if(@DELETECOUNT > 0) begin delete t_c2 where exists(select temp.cid from deleted temp where temp.cid=t_c2.cid); endend
更新觸發器和事務
事務主要用在數據的保護，在多表更新時，事務保存所有事務下的更新語句就不會提交，數據也就不能更新成功
alter trigger tri_TC_Update on t_c for updateasbegin declare @delcount int; set @delcount = (select count(*) from deleted); if(@delcount > 0) begin begin transaction triUpdate --定義事務 declare @cname varchar(100); select @cname = cname from inserted; --保存更新后的內容 update t_c2 set cname = @cname where cid = (select cid from deleted); --更新 if (@@error <> 0) begin rollback transaction triUpdate; --事務回滾 end else begin commit transaction triUpdate; --事務提交 end endend
存儲過程
if(exists(select name from sysobjects s where s.name='pro_fun' and s.type='p')) drop procedure pro_fungo create procedure pro_funas select * from tablegoexec pro_fun
游標
declare @qybh varchar(10)declare cur cursor for select distinct qybh from PJ_EnterpriseInputopen curfetch next from cur into @qybhwhile @@fetch_status = 0 begin print(@qybh) fetch next from cur into @qybh endclose curdeallocate cur
視圖
alter view CreateViewas select qybh from CreateViewgo
定義方法
alter function funName(@str1 varchar(10),@str2 varchar(10))returns varchar(10)asbegin declare @returnStr varchar(10) set @returnStr = 'false' if(@str1 > @str2) set @returnStr = 'true' return @returnStrendselect dbo.funName(... , ...)
定義表變量
declare @qybhTable table (id varchar(32),qybh varchar(30))insert into @qybhTableselect id,qybh from PJ_EnterpriseInputselect * from @qybhTable
case when then 條件統計時的使用
selectsum(case when z.watchName='注冊監理工程師' then 1 else 0 end),sum(case when z.watchName='xinza' then 1 else 0 end),sum(case when z.watchName='監理員' then 1 else 0 end)from zu_corjl zright join zu_corjltemp t on t.corID=z.corID
希望本文所述對大家SQL Server數據庫程序設計有所幫助
新聞熱點
疑難解答
