批量update数据

今天开发要更新一批数据，等了很久也没更新成功。找到了我，我在网上找了一下资料，发现在用rowid的方式更新最快，参照下面的文章更新成功，记录一下

DAVE文章链接：http://blog.csdn.net/tianlesoftware/article/details/6576156

 

原来的SQL:

update t_canhe_member_info a set a.id_card = (select b.id_card from BBB_EEE b 
                                                     where a.member_no = b.member_no)
                                   where a.join_year = '2014' ;

 

批量更新的PL/SQL块：

DECLARE
  CURSOR cur IS
    SELECT
     a.id_card, b.ROWID ROW_ID
      FROM BBB_EEE a, t_canhe_member_info b
     WHERE a.member_no = b.member_no  and b.join_year = '2014' 
     ORDER BY b.ROWID;  ---如果表的数据量不是很大,可以不用 order by rowid
  V_COUNTER NUMBER;
  V_JISHU number; --统计更新了多少条 

 
BEGIN
  V_COUNTER := 0;
  V_JISHU := 0;
  
  FOR row IN cur LOOP
    
    UPDATE t_canhe_member_info
       SET id_card = row.id_card 
     WHERE ROWID = row.ROW_ID;
    V_COUNTER := V_COUNTER + 1;
    V_JISHU := V_JISHU + 1;
    IF (V_COUNTER >= 1000) THEN
      COMMIT;     --1000条提交一次
      V_COUNTER := 0;      
    END IF;    
  END LOOP;
  COMMIT;
  DBMS_OUTPUT.PUT_LINE('更新了 ' || V_JISHU  || '条！' );
END;