mysql存储过程的游标和控制结构

以下代码由PHP站长网 52php.cn收集自互联网

现在PHP站长网小编把它分享给大家，仅供参考

DELIMITER $$

DROP PROCEDURE IF EXISTS `books`.`largest_order`$$

CREATE DEFINER=`root`@`192.168.18.248` PROCEDURE `largest_order`(out largest_id int)
BEGIN
 declare this_id int;
 declare this_amount float;
 declare l_amount float default 0.0;
 declare l_id int;
 declare done int default 0;
 declare cl cursor for select orderid,amount from orders;
 declare continue handler for sqlstate '02000' set done =1;
 open cl;
 repeat
   fetch cl into this_id,this_amount;
   if not done then
     if this_amount > l_amount then
        set l_amount = this_amount;
        set l_id = this_id;
      end if;
    end if;
 until done end repeat;
 close cl;
 set largest_id = l_id;
END$$

DELIMITER ;

以上内容由PHP站长网【52php.cn】收集整理供大家参考研究

如果以上内容对您有帮助，欢迎收藏、点赞、推荐、分享。

（编辑：淮安站长网）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!