MySQL错误TIMESTAMPcolumnwithCURRENT_TIMESTAMP的解决方法

CREATE TABLE `example` (
  `id` INTEGER UNSIGNED NOT NULL AUTO_INCREMENT,
  `created` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `lastUpdated` TIMESTAMP NOT NULL ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB;

ERROR 1293 (HY000): Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause.

One TIMESTAMP column in a table can have the current timestamp as the default value for initializing the column, as the auto-update value, or both. It is not possible to have the current timestamp be the default value for one column and the auto-update value for another column.

Previously, at most one TIMESTAMP column per table could be automatically initialized or updated to the current date and time. This restriction has been lifted. Any TIMESTAMP column definition can have any combination of DEFAULT CURRENT_TIMESTAMP and ON UPDATE CURRENT_TIMESTAMP clauses. In addition, these clauses now can be used with DATETIME column definitions. For more information, see Automatic Initialization and Updating for TIMESTAMP and DATETIME.

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 `update_example_trigger`;
DELIMITER //
CREATE TRIGGER `update_example_trigger` BEFORE UPDATE ON `example`
 FOR EACH ROW SET NEW.`lastUpdated` = NOW()
//
DELIMITER ;