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,