存储过程还带游标的（练习练习）

很少很少写存储过程，不行，得练练手才行。

----创建一个存储过程
create procedure updateExchangeGiftCount_produ
 as 
begin
declare @materialsnids int ----定义你需要的变量
declare @count int 
declare youbiao cursor for ----定义游标，取出你要的变量值
select  ig.materialsnid,
sum(GiftsCount) as giftcount
from dbo.IG_ExchangeHistory as eh
inner join dbo.IG_ExchangeGiftsHistory as egh 
on eh.exchangehistorynid=egh.exchangehistorynid
inner join dbo.IG_IntegralGifts as ig
on egh.IntegralGiftsNid=ig.IntegralGiftsNid
inner join dbo.WAR_Materials as mt
on ig.MaterialsNid=mt.materialsnid
group by ig.materialsnid
open youbiao ----打开游标
fetch next from youbiao into @materialsnids,@count ----把游标指向变量
while(@@fetch_status=0)
 begin
      update   dbo.WAR_Materials set ExchangeCount=@count 
where  MaterialsNid=@materialsnids   
fetch next from youbiao into @materialsnids,@count ----游标指向下一条
end 
close youbiao----关闭游标
deallocate youbiao ----删除游标
 end 


--execute updateExchangeGiftCount_produ