使用MySQL触发器将所有表更改记录到辅助表
我有一张桌子:使用MySQL触发器将所有表更改记录到辅助表,mysql,triggers,Mysql,Triggers,我有一张桌子: CREATE TABLE `data_table` ( `data_id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY , `field1` INT NOT NULL , `field2` INT NOT NULL , `field3` INT NOT NULL ) ENGINE = MYISAM ; 我会记录任何机会到field1、2或3,以: CREATE TABLE `data_tracking` ( `tracking_id` INT
CREATE TABLE `data_table` (
`data_id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`field1` INT NOT NULL ,
`field2` INT NOT NULL ,
`field3` INT NOT NULL
) ENGINE = MYISAM ;
我会记录任何机会到field1、2或3,以:
CREATE TABLE `data_tracking` (
`tracking_id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`data_id` INT NOT NULL ,
`field` VARCHAR( 50 ) NOT NULL ,
`old_value` INT NOT NULL ,
`new_value` INT NOT NULL ,
`modified` DATETIME NOT NULL
) ENGINE = MYISAM ;
我使用的是MySQL 5,我想创建一个触发器。每当数据表更新时,我想在数据跟踪中插入一个新行,并记录旧的/更新的值以及更改的字段。我尝试了下列方法,但没有成功
DELIMITER $$
DROP TRIGGER `update_data `$$
CREATE TRIGGER `update_data` AFTER UPDATE on `data_table`
FOR EACH ROW
BEGIN
IF (NEW.field1 != OLD.field1) THEN
INSERT INTO data_tracking set old_value = OLD.field1, new_value = NEW.field1, field = "field1";
END IF;
END$$
DELIMITER ;
它在insert行上给出了一个错误,我不太确定它的语法应该是什么,或者我是否用正确的方法来处理这个问题。任何帮助都将不胜感激。谢谢。插入语法是
INSERT INTO table (columns_list) VALUES (values_list)
因此,您的插入看起来像这样(我不是MySQL专家,但您可以适应查询):
并在第2和第3区域重复该步骤
我认为这将是一个完整的触发器,请尝试:
DELIMITER $$
DROP TRIGGER `update_data `$$
CREATE TRIGGER `update_data` AFTER UPDATE on `data_table`
FOR EACH ROW
BEGIN
IF (NEW.field1 != OLD.field1) THEN
INSERT INTO data_tracking
(`data_id` , `field` , `old_value` , `new_value` , `modified` )
VALUES
(NEW.data_id, "field1", OLD.field1, NEW.field1, NOW());
END IF;
IF (NEW.field2 != OLD.field2) THEN
INSERT INTO data_tracking
(`data_id` , `field` , `old_value` , `new_value` , `modified` )
VALUES
(NEW.data_id, "field2", OLD.field2, NEW.field2, NOW());
END IF;
IF (NEW.field3 != OLD.field3) THEN
INSERT INTO data_tracking
(`data_id` , `field` , `old_value` , `new_value` , `modified` )
VALUES
(NEW.data_id, "field3", OLD.field3, NEW.field3, NOW());
END IF;
END$$
DELIMITER ;
我刚刚添加了我对触发器的想法。你确定你的“数据表”有一个名为data\u id的字段吗?哦,对不起,你是对的,当我创建示例表时,我在最后一分钟更改了其中一个。这很有效。很抱歉造成混淆:(+1,这是一个完美的解决方案;是否有任何方法可以在不写入大量IF条件的情况下检查所有列数据???定义一个MySQL变量,使其具有相同的时间戳值:
SET@ts=NOW()
DELIMITER $$
DROP TRIGGER `update_data `$$
CREATE TRIGGER `update_data` AFTER UPDATE on `data_table`
FOR EACH ROW
BEGIN
IF (NEW.field1 != OLD.field1) THEN
INSERT INTO data_tracking
(`data_id` , `field` , `old_value` , `new_value` , `modified` )
VALUES
(NEW.data_id, "field1", OLD.field1, NEW.field1, NOW());
END IF;
IF (NEW.field2 != OLD.field2) THEN
INSERT INTO data_tracking
(`data_id` , `field` , `old_value` , `new_value` , `modified` )
VALUES
(NEW.data_id, "field2", OLD.field2, NEW.field2, NOW());
END IF;
IF (NEW.field3 != OLD.field3) THEN
INSERT INTO data_tracking
(`data_id` , `field` , `old_value` , `new_value` , `modified` )
VALUES
(NEW.data_id, "field3", OLD.field3, NEW.field3, NOW());
END IF;
END$$
DELIMITER ;