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MySQL 存储过程和"Cursor"的使用方法
来源: 互联网 发布时间:2014-09-06
本文导语: 示例如下: 代码如下: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 `...
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()
代码如下:
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()