业务场景:例如用户表,我们需要建一个字段是创建时间, 一个字段是更新时间.解决办法可以是指定插入时间,也可以使用数据库的默认时间.在mysql中如果设置两个默认CURRENT_TIMESTAMP,会出现这样的错误. ERROR 1293 (HY000): Incorrect table definition; there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT or ON UPDATE clause.错误的建表语句: CREATE TABLE db1.sms_queue ( Id INTEGER UNSIGNED NOT NULL AUTO_INCREMENT, Message VARCHAR(160) NOT NULL DEFAULT ‘Unknown Message Error’, CurrentState VARCHAR(10) NOT NULL DEFAULT ‘None’, Phone VARCHAR(14) DEFAULT NULL, Created TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, LastUpdated TIMESTAMP NOT NULL ON UPDATE CURRENT_TIMESTAMP, TriesLeft tinyint NOT NULL DEFAULT 3, PRIMARY KEY (Id) ) ENGINE = InnoDB;解决办法,可以使用触发器或者其他,在此还是使用数据库的方式.建表语句: create table test_table( id integer not null auto_increment primary key, stamp_created timestamp default ‘0000-00-00 00:00:00’, stamp_updated timestamp default now() on update now() );测试:mysql> insert into test_table(stamp_created, stamp_updated) values(null, null);Query OK, 1 row affected (0.06 sec)mysql> select * from t5;+----+---------------------+---------------------+ | id | stamp_created | stamp_updated |+----+---------------------+---------------------+| 2 | 2009-04-30 09:44:35 | 2009-04-30 09:44:35 |+----+---------------------+---------------------+2 rows in set (0.00 sec)mysql> update test_table set…