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Oracle多表级联更新详解

Jun 07, 2016 pm 02:53 PM
oracle renew Detailed explanation

我们在平时的工作中可能遇到过,多表级联更新,我也在网上看到过不少的方法,但是使用这些方法一般都没成功过,所以今天我给大家介绍一种稍微麻烦的方法,有需要的朋友可以参考下 用游标实现,我觉得绝对这种方法比较安全的。 --首先定一个游标把需要用到

我们在平时的工作中可能遇到过,多表级联更新,我也在网上看到过不少的方法,但是使用这些方法一般都没成功过,所以今天我给大家介绍一种稍微麻烦的方法,有需要的朋友可以参考下

 

用游标实现,我觉得绝对这种方法比较安全的。
--首先定一个游标把需要用到的一些数据存放到游标中:

复制代码 代码如下:


declare
  CURSOR D_CURSOR_CUS_INFO IS
    select t3.id_           as id_,
           t3.owe_money_    as owe_money_,
           a.heatingArea    as heating_area_
    from T_CUS_OWE_MONEY_2 t2
    left join T_CUS_OWE_MONEY_3 t3 on t2.id_= t3.id_
    left join (select s.bh,  sum(
           case
                 when s.stkbz='0' then nvl(s.mj,0)
                 when s.stkbz='1' then 0-nvl(s.mj,0)
           end
      ) as heatingArea from  sk s  where s.nd = '2008-2009' group by s.bh) a on t2.bh_=a.bh
  where  t3.owe_money_- t2.owe_money_  = a.heatingArea*5 and t3.OWE_MONEY_ > 0;


--然后循环游标对数据进行更新:

复制代码 代码如下:


begin
        FOR everyRow IN D_CURSOR_CUS_INFO
        loop
         update T_CUS_YEAR_STATUS t
             set t.HEATING_AREA_ = everyRow.HEATING_AREA_,
                 t.OWE_MONEY_    = everyRow.owe_money_
             where t.YEAR_ = '2008-2009'
                   and t.id_ = everyRow.id_;
       end loop;
      commit;
end;

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