MySQL的存储过程写法和"Cursor"的使用

3/11/2008来源:MySQL教程人气:7099

本文中介绍了一个MySQL存储过程,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;

总结:

1、注意设置游标的countinue handler:DECLARE CONTINUE HANDLER FOR NOT FOUND set stopFlag=1;

2、注意REPEAT和UTILE [停止条件] END REPEAT的使用,否则不会循环;

3、如何RUN,输入并执行:call justifyGroupNum()