mysql 存储过程 循环

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DELIMITER $$

CREATE DEFINER=`root`@`%` PROCEDURE `sp_pament_TrainFee`()
BEGIN
/*局部变量的定义 declare*/
declare strYear int;
declare strEnrollID int;
declare feesum int;
declare stop int default 0;
declare cur cursor for(
select  year ,EnrollID ,sum(Fee) from trainmanage  where ReturnStatus !=1 group by Year,EnrollID );
 /*这把 游标 异常后 捕捉
         *        并设置 循环使用 变量 stop 为 null 跳出循环。
*/
declare CONTINUE HANDLER FOR SQLSTATE \'02000\' SET stop = null;
/*开游标*/
OPEN cur;
/*游标向下走一步，将查询出来的值付给定义的变量*/
    FETCH cur INTO strYear,strEnrollID,feesum;
    WHILE ( stop is not null) DO
    update payment  set  ExpectTrain=feesum   where EnrollID = strEnrollID and right(ID,2) =right(strYear,2) ;
    FETCH cur INTO strYear,strEnrollID,feesum;
    END WHILE;
/*游标向下走一步*/
CLOSE cur;
END