Mysql利用游标遍历查询结果集

drop procedure if exists looppc;
delimiter //
create procedure looppc(OUT param1 INT)
begin
declare Done int default 0;
declare address1 varchar(50);
declare cityCode1 varchar(50);
declare location1 varchar(50);

– 声明游标
declare rs cursor for select address,city_code,location from machine where id in ( select min(id) from machine group by address having address is not null);

– 异常处理
DECLARE CONTINUE HANDLER FOR NOT FOUND SET Done = 1;

– 打开游标
OPEN rs;
// 查询结果集的条数
set param1 = (select FOUND_ROWS());

/* 逐个取出当前记录LingQi字段的值，需要进行最大值的判断 */
FETCH rs INTO address1, cityCode1, location1;
/* 遍历数据表 */
REPEAT
insert into address(address,city_code,location) values (address1,cityCode1,location1);
update machine set address_id = id1 where address = address1;
FETCH rs INTO address1, cityCode1, location1;

  UNTIL Done END REPEAT;     
  /* 关闭游标 */
  CLOSE rs;

END //
DELIMITER ;

// 执行存储过程
call looppc(@a);
// 打印结果
select @a;