mysql数据库CURRENT_TIMESTAMP时间戳

2025-04-18 18:46:04

1、登录mysql，在test数据库中新建一个表，shijian字段是timestamp 亿姣灵秀类型，默认是CURRENT_TIMESTAMP ，只要增加更新shijian字段会变为当前时间：旌忭檀祉 Create Table CREATETABLE`chengshi`(`id`int(11)NOTNULLAUTO_INCREMENT,`shengfen`varchar(10)DEFAULTNULL,`chengshi`varchar(10)DEFAULTNULL,`shijian`timestampNOTNULLDEFAULTCURRENT_TIMESTAMPONUPDATECURRENT_TIMESTAMP,PRIMARYKEY(`id`))ENGINE=InnoDBAUTO_INCREMENT=10DEFAULTCHARSET=utf8

2、在表中增加一些数据：insert into `chengshi` (`id`, `衡痕贤伎shengfen`, `chengshi`, `shi枣娣空郅jian`) values('1','河南','安阳','2019-03-05 10:14:27');insert into `chengshi` (`id`, `shengfen`, `chengshi`, `shijian`) values('2','河南','郑州','2019-03-05 10:14:27');insert into `chengshi` (`id`, `shengfen`, `chengshi`, `shijian`) values('3','河南','洛阳','2019-03-05 10:14:27');insert into `chengshi` (`id`, `shengfen`, `chengshi`, `shijian`) values('4','河南','漯河','2019-03-05 10:14:27');insert into `chengshi` (`id`, `shengfen`, `chengshi`, `shijian`) values('5','河南','新乡','2019-03-05 10:14:27');insert into `chengshi` (`id`, `shengfen`, `chengshi`, `shijian`) values('6','河南','濮阳','2019-03-05 10:14:27');insert into `chengshi` (`id`, `shengfen`, `chengshi`, `shijian`) values('7','河南','焦作','2019-03-05 10:14:27');insert into `chengshi` (`id`, `shengfen`, `chengshi`, `shijian`) values('8','河南','鹤壁','2019-03-05 10:14:27');insert into `chengshi` (`id`, `shengfen`, `chengshi`, `shijian`) values('9','河南','开封','2019-03-05 10:14:27');

3、时间戳基本的用法，它表示当前时间：SELECT CURRENT_TIMESTAMP,NOW();

4、在表中增加一个数据，看shijian字段为登记时间，INSERT INTO chengshi(shengfen,chengshi)VALUES('河南','信阳');

5、查询表中所有数据：SELECT * FROM chengshi;shijian字段变成录入时间。

6、把id=1的记录chengshi='安阳林州'，看shijian字段有没有变化：UPDATE chengshi SET chengshi='安阳林州' WHERE id=1;

7、查询表中所有数据：SELECT * FROM chengshi;shijian字段变成更新时间。

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