mysql 多個timestamp 錯誤:there can be only one TIMESTAMP column with CURRENT_TIMESTAMP
阿新 • • 發佈:2017-12-13
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mysql 5.6.5以下的版本不支持多個timestamp同時設為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與表相關聯,如果表刪除了trigger也就沒有了
insert、update、delete三種行為只能對應最多一個trigger
參考文獻:
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
mysql 多個timestamp 錯誤:there can be only one TIMESTAMP column with CURRENT_TIMESTAMP