SQL Server触发器和事务用法示例

数据库  /  管理员 发布于 5年前   164

本文实例讲述了SQL Server触发器和事务用法。分享给大家供大家参考，具体如下：

新增和删除触发器

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

更新触发器和事务

事务主要用在数据的保护，在多表更新时，事务保存所有事务下的更新语句就不会提交，数据也就不能更新成功

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 --定义事务   declare @cname varchar(100);   select @cname = cname from inserted; --保存更新后的内容   update t_c2 set cname = @cname where cid = (select cid from deleted); --更新   if (@@error <> 0)   begin    rollback transaction triUpdate; --事务回滚   end   else   begin    commit transaction triUpdate;  --事务提交   end  endend

存储过程

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

游标

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

视图

alter view CreateViewas select qybh from CreateViewgo

定义方法

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(... , ...)

定义表变量

declare @qybhTable table (id varchar(32),qybh varchar(30))insert into @qybhTableselect id,qybh from PJ_EnterpriseInputselect * from @qybhTable

case when then 条件统计时的使用

selectsum(case when z.watchName='注册监理工程师' then 1 else 0 end),sum(case when z.watchName='xinza' then 1 else 0 end),sum(case when z.watchName='监理员' then 1 else 0 end)from zu_corjl zright join zu_corjltemp t on t.corID=z.corID

希望本文所述对大家SQL Server数据库程序设计有所帮助。