SQL Server触发器和事务

--新增和删除触发器

alter trigger tri_TC on t_c
   for INSERT,delete
as
begin
   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);    
   end
end

--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 update
as
begin
   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     
   end
end

 

---------------------存储过程
if(exists(select name from sysobjects s where s.name='pro_fun' and s.type='p'))
   drop procedure pro_fun
go
   create procedure pro_fun
as
   select * from table
go
exec pro_fun
-------------------游标
declare @qybh varchar(10)
declare cur cursor for
   select distinct qybh from PJ_EnterpriseInput
open cur
fetch next from cur into @qybh
while @@fetch_status = 0
  begin
    print(@qybh)
    fetch next from cur into @qybh
  end
close cur
deallocate cur
----------------------------------视图
alter view CreateView
as
  select qybh from CreateView
go
----------------------------------定义方法
alter function funName(@str1 varchar(10),@str2 varchar(10))
returns varchar(10)
as
begin
   declare @returnStr varchar(10)
   set @returnStr = 'false'
   if(@str1 > @str2)  
       set @returnStr = 'true'
   return @returnStr
end
select dbo.funName(... , ...)
----------------------定义表变量
declare @qybhTable table (id varchar(32),qybh varchar(30))
insert into @qybhTable
select id,qybh from PJ_EnterpriseInput
select * from @qybhTable
---------------------------case when then 条件统计时的使用
select
sum(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 z
right join zu_corjltemp t on t.corID=z.corID