MySQL CURRENT_TIMESTAMP创建和更新

CREATE TABLE `test` (
    `id` INT PRIMARY KEY AUTO_INCREMENT,
    `name` VARCHAR(256),
    `create_time` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    `update_time` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
)

ALTER table test ADD COLUMN up_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP

支持5.7以上版本