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