mysql 5.6.5以下的版本不支持多个timestamp同时设为default current_timestamp
替代方式是使用trigger
CREATE TABLE `example` ( `id` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT, `created` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, `lastUpdated` DATETIME NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB;
DROP TRIGGER IF EXISTS `insert_example_trigger`; DROP TRIGGER IF EXISTS `update_example_trigger`; DELIMITER // CREATE TRIGGER `insert_example_trigger` BEFORE INSERT ON `example` FOR EACH ROW SET NEW.`lastUpdated` = NOW()
CREATE TRIGGER `update_example_trigger` BEFORE UPDATE ON `example`
FOR EACH ROW SET NEW.`lastUpdated` = NOW() // DELIMITER ;
trigger与表相关联，如果表删除了trigger也就没有了
insert、update、delete三种行为只能对应最多一个trigger
参考文献：
http://www.jb51.net/article/50878.htm
https://www.cnblogs.com/lmule/archive/2010/09/28/1837303.html
https://www.cnblogs.com/nicholas_f/archive/2009/09/22/1572050.html
