mysql 游标的使用方法

BEGIN
/*计算用户提成总金额*/
declare amountPrice,pays,rates,goodsPrice DECIMAL(10,2) DEFAULT 0;
DECLARE  flag int,getUserId;
#if(userlevel=1) then
 
SELECT  member_id into getUserId  from 33hao_member where openid=open_id
 
declare cur cursor for  select commission1_rate rates,commission1_pay pays,goods_price from 33hao_goods_common;
 DECLARE CONTINUE HANDLER FOR NOT FOUND SET flag=1;
    SET flag=0;
OPEN cur;
REPEAT
FETCH cur into rates,pays,goodsPrice;
 
if(rates=null) then
  set amountPrice=amountPrice+pays;
ELSE
   set  amountPrice=amountPrice+goodsPrice*rates;
end if;
 
UNTIL flag end REPEAT;
 
CLOSE cur;
RETURN  amountPrice;
end