[mysql触发更新，使列高于其他列

Question

我正在尝试创建mySql触发器。

表program_user看起来像这样：

user_id | program_id |周| max_week | is_active |

我的目标是保持max_week中的整数始终等于或大于week因为week可以由用户重置，所以我需要保持他的最佳进度。

行已创建，并以3种不同方式更新：

• 由服务器（实际周数为+1）
• 由用户重置（week = 1）
• 由管理员设置

我在更新后尝试使用多个代码来更新行本身，但是它们似乎都不起作用。 Google似乎找不到任何类似的情况，也没有stackOverflow：（

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET AUTOCOMMIT = 0;
START TRANSACTION;
SET time_zone = "+00:00";

CREATE TABLE `program_user` (
  `user_id` int(11) NOT NULL,
  `prog_id` int(11) NOT NULL,
  `week` int(11) DEFAULT NULL,
  `max_week` int(11) NOT NULL DEFAULT '1',
  `active` tinyint(4) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `program_user` (`user_id`, `prog_id`, `week`, `max_week`, `active`) VALUES
(6967, 1, 2, 2, 1),
(6967, 2, 2, 4, 0),
(6967, 3, 1, 1, 0),
(6967, 4, 1, 1, 0),
(6967, 5, 1, 1, 0),
(6968, 1, 1, 1, 1),
(6968, 2, 1, 1, 0),
(6968, 3, 1, 1, 0),
(6968, 4, 1, 1, 0),
(6968, 5, 1, 1, 0);

DELIMITER $$
CREATE TRIGGER `trigg_max_week1` BEFORE UPDATE ON `program_user` FOR EACH ROW BEGIN
       IF new.week >= old.max_week THEN
          SET new.max_week = new.week;
       END IF;
    END
$$
DELIMITER ;

ALTER TABLE `program_user`
  ADD UNIQUE KEY `user_idpk` (`user_id`,`prog_id`);


COMMIT;

然后更新：

UPDATE `program_user` SET `week` = '5' WHERE `program_user`.`user_id` = 6967 AND `program_user`.`prog_id` = 2;

结果：保存触发器或更新任何星期列时均无错误，但是，更新后列max_week保持其初始状态。

谢谢：）

Answer 1

我看不到您的问题，通过提供的信息，您的触发器可以正常工作。

drop table if exists program_user;
CREATE TABLE `program_user` (
  `user_id` int(11) NOT NULL,
  `prog_id` int(11) NOT NULL,
  `week` int(11) DEFAULT NULL,
  `max_week` int(11) NOT NULL DEFAULT '1',
  `active` tinyint(4) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO `program_user` (`user_id`, `prog_id`, `week`, `max_week`, `active`) VALUES
(6967, 1, 2, 2, 1),
(6967, 2, 2, 4, 0),
(6967, 3, 1, 1, 0),
(6967, 4, 1, 1, 0),
(6967, 5, 1, 1, 0),
(6968, 1, 1, 1, 1),
(6968, 2, 1, 1, 0),
(6968, 3, 1, 1, 0),
(6968, 4, 1, 1, 0),
(6968, 5, 1, 1, 0);

DELIMITER $$
CREATE TRIGGER `trigg_max_week1` BEFORE UPDATE ON `program_user` FOR EACH ROW 
BEGIN
       IF new.week >= old.max_week THEN
          SET new.max_week = new.week;
       END IF;
END $$
DELIMITER ;

ALTER TABLE `program_user`
  ADD UNIQUE KEY `user_idpk` (`user_id`,`prog_id`),
  ADD KEY `const_seance_id_seance` (`prog_id`);


UPDATE `program_user` 
    SET `week` = '5' 
WHERE `program_user`.`user_id` = 6967 AND `program_user`.`prog_id` = 2;

select * from program_user WHERE `program_user`.`user_id` = 6967 AND `program_user`.`prog_id` = 2;

+---------+---------+------+----------+--------+
| user_id | prog_id | week | max_week | active |
+---------+---------+------+----------+--------+
|    6967 |       2 |    5 |        5 |      0 |
+---------+---------+------+----------+--------+
1 row in set (0.00 sec)