ALTER TABLE `mess`.`role` CHANGE `lastUpdate` `t1` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间'
取消自动更新编辑时间字段:
ALTER TABLE `mydb`.`cd00_feihu` CHANGE `t1` `t1` TIMESTAMP NOT NULL DEFAULT
ALTER TABLE `mess`.`role` CHANGE `lastUpdate` `t1` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间'