mysql时间属性之时间戳和datetime之间的转换

1 use`nec`;
2 SET SQL_SAFE_UPDATES=0;
3 ALTER TABLE `usr_user_info` CHANGE COLUMN `registerTime` `registerTime` BIGINT(20) NOT NULL COMMENT ‘注册时间‘ ,
4 ALTER TABLE `usr_user_info` CHANGE COLUMN `lastLoginTime` `lastLoginTime` BIGINT(20) NULL DEFAULT NULL COMMENT ‘最后登录时间‘ ;
5 UPDATE `usr_user_info` SET  `lastLoginTime` = unix_timestamp(`lastLoginTime`);
6 UPDATE `usr_user_info` SET  `registerTime` = unix_timestamp(`registerTime`);

 1 --
 2 -- table alter for usr_user_info
 3 --
 4 /*增加字段*/
 5 use `nec`;
 6 ALTER TABLE `usr_user_info` ADD COLUMN tempRegisterTime BIGINT(20) NULL ;
 7 ALTER TABLE `usr_user_info`  ADD COLUMN tempLastLoginTime BIGINT(20) NULL ;
 8 
 9 /*进行时间转化，并复制列*/
10 UPDATE  usr_user_info SET tempRegisterTime=unix_timestamp(registerTime);
11 UPDATE  usr_user_info SET tempLastLoginTime=unix_timestamp(lastLoginTime);
12 
13 /*删除原有字段*/
14 ALTER TABLE usr_user_info
15     DROP registerTime,DROP lastLoginTime;
16 
17 /*更新临时字段名称*/
18 ALTER TABLE usr_user_info CHANGE tempRegisterTime registerTime BIGINT(20) NOT NULL  COMMENT ‘注册时间‘;
19 ALTER TABLE usr_user_info CHANGE tempLastLoginTime lastLoginTime BIGINT(20)  COMMENT ‘最近登录时间‘;