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mysql中的 ON UPDATE CURRENT_TIMESTAMP
2022-06-24 06:39:00 【raoxiaoya】
Mysql中如果你希望由系统自动填充时间的话，可以将字段类型设置为timestamp，这样的话，在创建一条的记录的时候就会有时间；此时这条数据发生了变更，这个时间是不会变的，如果想让时间也能自动更新，那么需要设置为同步更新ON UPDATE CURRENT_TIMESTAMP，如果仅仅使用了update语句，但是各个字段的值没有变化，那么时间也不会更新。
`upd_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP
`upd_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
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