百万数据库循环取值进行更新的算法

Question

begin

          Declare GuestCursor Cursor For 
         Select top 88888 XLH,SL  from  CP_SSQ6_005  where xtbz='0' order by XLH asc;
         Open GuestCursor
         Fetch Next From GuestCursor into @V_XLH,@V_SL;                              
         WHILE @@FETCH_STATUS = 0
         Begin
            update CP_SSQ6_005 set xtbz='1' where xlh=@V_XLH;

            set @V_SL=rtrim(ltrim(@V_SL)); 
            set @V_1=substring(@V_SL,1,2);
            set @V_2=substring(@V_SL,3,2);
            set @V_3=substring(@V_SL,5,2);
            set @V_4=substring(@V_SL,7,2);
            set @V_5=substring(@V_SL,9,2);
            set @V_6=substring(@V_SL,11,2);

            Select @V_or=dbo.F_GetOrder_2_3(@V_SL)
            
            set @T_1=CAST(@V_1 AS decimal(18,0)) 
            set @T_2=CAST(@V_2 AS decimal(18,0)) 
            set @T_3=CAST(@V_3 AS decimal(18,0)) 
            set @T_4=CAST(@V_4 AS decimal(18,0)) 
            set @T_5=CAST(@V_5 AS decimal(18,0)) 
            set @T_6=CAST(@V_6 AS decimal(18,0))

            set @T_JE=@T_1+@T_2+@T_3+@T_4+@T_5+@T_6;
           
 
     
          if(@T_JE>=121)
           begin
              
                    update CP_SSQ6_005 set scbz='1',xtbz='1' where xlh=@V_XLH;
                   waitfor delay '00:00:00';

--                                               
            end;


           Fetch Next From GuestCursor into @V_XLH,@V_SL;     
         end
         Close          GuestCursor
         DealLocate     GuestCursor
end

 

我有一个百万数据库，需要循环取值进行计算，现在是用游标每次只能取88888 条记录，这样很麻烦，有没有百万数据库循环取值进行更新的算法

Answer 1

可以试下把判断逻辑放到一个用户函数中，然后批量更新值，如 update CP_SSQ6_005 set scbz='1',xtbz='1' where dbo.fun(SL)>=121

Answer 2

为什么要用游标，直接循环就可以了， update CP_SSQ6_005 set xtbz='1' where xlh=@V_XLH; xlh是索引吗？可以直接用物理的ID. update CP_SSQ6_005 set scbz='1',xtbz='1' where  两次更新xtbz='1' 为同样的值？   @V_1 @T_1变量可以提出循环

Answer 3

不建议使用游标,严重影响效率