Question

我有这个数据和表结构，我正在创建MySQL存储过程来汇总parentid左边的所有数量，我对存储过程没有足够的知识。我需要一些帮助，因为我是丢失。

CREATE TABLE IF NOT EXISTS `mytree` (
  `parentid` int(11) NOT NULL,
  `memberid` int(11) NOT NULL,
  `position` char(1) NOT NULL,
  `amount` decimal(10,2) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1;


INSERT INTO `mytree` (`parentid`, `memberid`, `position`, `amount`) VALUES
    (8, 27, 'R', 0.00),
    (8, 28, 'L', 0.00),
    (24, 26, 'R', 0.00),
    (0, 1, '', 5500.00),
    (24, 25, 'L', 0.00),
    (21, 24, 'L', 500.00),
    (21, 23, 'R', 0.00),
    (18, 20, 'R', 1500.00),
    (18, 19, 'L', 0.00),
    (15, 18, 'R', 2000.00),
    (15, 17, 'L', 0.00),
    (13, 16, 'L', 0.00),
    (13, 15, 'R', 2500.00),
    (12, 14, 'R', 0.00),
    (12, 13, 'L', 3000.00),
    (10, 12, 'R', 3500.00),
    (10, 11, 'L', 0.00),
    (7, 10, 'R', 4000.00),
    (7, 9, 'L', 0.00),
    (5, 8, 'R', 500.00),
    (5, 7, 'L', 4500.00),
    (1, 6, 'R', 0.00),
    (1, 5, 'L', 5500.00),
    (20, 22, 'R', 0.00),
    (20, 21, 'L', 1000.00);

这是我的存储过程

CREATE DEFINER=`root`@`localhost` PROCEDURE `count_left_right_amount`(IN `p_memid` INT, OUT `tot_left_amount` DECIMAL(10,2))
    LANGUAGE SQL
    NOT DETERMINISTIC
    CONTAINS SQL
    SQL SECURITY DEFINER
    COMMENT ''
BEGIN

DECLARE row_total decimal(10,2);
DECLARE total decimal(10,2);
DECLARE m_left int;
DECLARE run_left int;
DECLARE p_id int;

set total =  0;

select memberid into p_id from mytree where position = 'L' AND parentid = p_memid;




WHILE  p_id != 0 DO

 select amount into row_total from mytree where parentid = p_id 
  GROUP BY parentid;

 select memberid into m_left from mytree where parentid = p_id;
 set total = total + row_total;
 set p_id = m_left;


END WHILE;


END

例如，如果parentid是5，那么左边的孩子是7然后去他的子树总和，所以左边孩子的总数是'22500'？如果我错了，请纠正我。

请帮帮我。

提前谢谢。

需要帮助我的存储过程

0 个答案: