SQL循环遍历数据集

SET ROWCOUNT 0
select * into #rrr from [OA_test].[dbo].[Company_KLFolder]    ----新建临时表#rrr

declare @KLFGUID uniqueidentifier
declare @CGUID uniqueidentifier
declare @count int
declare @Sequence int


WHILE EXISTS(select [KLFGUID] from #rrr)    ---遍历临时表
begin
 SET ROWCOUNT 1    ---------设置影响行数为1
  select @KLFGUID=cast([KLFGUID] as varchar(max)),@CGUID=CGUID from #rrr order by [CGUID] desc
  print  cast(@KLFGUID as varchar(max))
  print cast(@CGUID as varchar(max))
 set rowcount 0        ---------设置影响行数  不限制
  select @Sequence = max([KLFSequence]) from [OA_test].[dbo].[Company_KLFolder] where  CGUID = @CGUID
  update Company_KLFolder set [KLFSequence] = (@Sequence+1) where [KLFGUID] = @KLFGUID
  delete from #rrr where [KLFGUID] = @KLFGUID    ------删除临时表中遍历过的本条数据
  end

drop table #rrr   ----删除临时表