本文中介紹了一個MySQL的存儲過程，其中涉及Cursor的使用，示例如下：
CREATE PROCEDURE `justifyGroupNum`()
NOT DETERMINISTIC
SQL SECURITY DEFINER
COMMENT ''
BEGIN
/*how to run:call justifyGroupNum()*/
DECLARE p_group_id int;
declare p_num int;
declare stopFlag int;
DECLARE cursor_name CURSOR
FOR select c_group_id,count(*) as num
from `t_group_member`
where c_valid in (3,4)
group by c_group_id;
DECLARE CONTINUE HANDLER FOR NOT FOUND set stopFlag=1;
OPEN cursor_name;
REPEAT
FETCH cursor_name INTO p_group_id,p_num;
begin
update t_groupinfo set c_member_number=p_num where c_group_id=p_group_id;
end;
UNTIL stopFlag = 1
END REPEAT;
CLOSE cursor_name;
END;
總結：
1、注意設置游標的countinue handler：DECLARE CONTINUE HANDLER FOR NOT FOUND set stopFlag=1;
2、注意REPEAT和UTILE [停止條件] END REPEAT的使用，否則不會循環；
3、如何RUN，輸入並執行：call justifyGroupNum()
