[MySQL] mysql 5.5和 5.6 timestamp default 默认值CURRENT_TIMESTAMP问题

TIMESTAMP在MySQL5.5中的行为:

1.第一个未设置默认值的TIMESTAMP NOT NULL字段隐式默认值：CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP

2.后面未设置默认值的TIMESTAMP NOT NULL字段隐式默认值：0000-00-00 00:00:00

3.不支持多个CURRENT_TIMESTAMP 默认值

5.5的建表语句类似这样:

CREATE TABLE `audit_log` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `ent_id` int(10) unsigned NOT NULL DEFAULT '0',
  `rule_id` int(10) unsigned NOT NULL DEFAULT '0',
  `rules_detail` varchar(2048) NOT NULL DEFAULT '' COMMENT '规则详情',
  `sender_email` varchar(512) NOT NULL DEFAULT '' COMMENT '发件人被审核邮箱',
  `receiver_email` varchar(512) NOT NULL DEFAULT '' COMMENT '收件人邮箱',
  `subject` varchar(512) NOT NULL DEFAULT '' COMMENT '主题',
  `createtime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `start_time` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
  `end_time` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
  `status` tinyint(3) unsigned NOT NULL DEFAULT '1' COMMENT '当前状态(1 通过,2 拒绝,3 超时拒绝,4 超时通过)',
  `reviewer_leader` varchar(512) NOT NULL DEFAULT '' COMMENT '审核人',
  PRIMARY KEY (`id`),
  KEY `idx_ent_id` (`ent_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 COMMENT='审核日志表'

TIMESTAMP在MySQL5.6中的行为:

支持多个CURRENT_TIMESTAMP 默认值,但是不支持设置默认值为0000-00-00 00:00:00

5.6的可以这样:

  `createtime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `start_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `end_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,