Sql语句摘要

1.分批更新数据库

declare @x int
set @x=1
while(@x<=51)
begin
begin tran
update UserFavorite set UserFavorite.firstpublishtime = product.lastpublishtime
from UserFavorite,product where UserFavorite.productid = product.id
and UserFavorite.id between (@x-1)* 10000 and @x*10000
commit tran
set @x=@x+1
WAITFOR DELAY '00:00:30'; --等待5秒
end

2.批量更新收藏表

USE [TianYi]

GO

/****** Object:  StoredProcedure [dbo].[UpdateUserFavoriteByProductid]    Script Date: 01/23/2015 13:28:22 ******/

SET ANSI_NULLS ON

GO

SET QUOTED_IDENTIFIER ON

GO

  ALTER proc [dbo].[UpdateUserFavoriteByProductid]

  as

  begin

   create table #temp2

   (

     id int identity(1,1),

     productid int,

     LastPublishTime datetime

   )

  

   declare @ufpage int --@ufnum/10000

   declare @ufn int --收藏表循环次数

    --取出所有要更新的系列下的所有产品

     insert into #temp2 select ID,LastPublishTime from Product where serieID in(select distinct serieID from Product where IsCollectionOperate=1)

                set @ufn=1

                set @ufpage=1000--假设有10000000条数据

                while @ufn<=@ufpage

                 begin

                    begin tran

update UserFavorite set  UserFavorite.isSeriesUpdate=1,UserFavorite.ispop=1,

UserFavorite.FirstPublishTime = #temp2.LastPublishTime

from UserFavorite  inner join #temp2  on  UserFavorite.productID=#temp2.productid

where UserFavorite.ID between (@ufn-1)*10000 and @ufn*10000

                    set @ufn=@ufn+1

                    WAITFOR DELAY '00:00:02'; 

                     commit tran

                 end

                  --更新后重置更新状态

               update Product set IsCollectionOperate=0 where Id in(select productid from #temp2)

     

     truncate table #temp2 --删除原表数据,并重置自增列

     insert into #temp2 select ID,LastPublishTime from Product where Id in(select distinct productID from ProductAudio where IsCollectionOperate=1)

                set @ufn=1

                set @ufpage=1000--假设有10000000条数据

                while @ufn<=@ufpage

                 begin

                    begin tran

                      update UserFavorite set UserFavorite.isread=1,UserFavorite.ispop=1,

UserFavorite.FirstPublishTime = #temp2.LastPublishTime

from UserFavorite  inner join #temp2  on  UserFavorite.productID=#temp2.productid

where UserFavorite.ID between (@ufn-1)*10000 and @ufn*10000

                    set @ufn=@ufn+1

                    WAITFOR DELAY '00:00:02'; 

                     commit tran

                 end

                  update ProductAudio set IsCollectionOperate=0 where productid in (select productid from #temp2)

    

 end

-------------------------------------------------------------------------------------------------------------------------

 

 3. 批量更新递增列

--申明一个游标
DECLARE MyCursor CURSOR
FOR select id from productaudio where productid = 756407 order by linkurl

declare @x int
set @x=1

--打开一个游标
OPEN MyCursor

--循环一个游标
DECLARE @id int
FETCH NEXT FROM MyCursor INTO @id
WHILE @@FETCH_STATUS =0
BEGIN
update productaudio set audioname = @x where id = @id
set @x=@x+1
FETCH NEXT FROM MyCursor INTO @id
END

--关闭游标
CLOSE MyCursor
--释放资源
DEALLOCATE MyCursor