mysql存储过程更新表字段

DROP PROCEDURE IF EXISTS updatetime ;
CREATE PROCEDURE updatetime()
BEGIN
declare _review_id int;
declare _time varchar(20);
declare _date varchar(25);
DECLARE rs_cursor CURSOR FOR  select review_id from review where entity_id=1;
open rs_cursor;
cursor_loop:loop
FETCH rs_cursor into _review_id;

set _time =  FLOOR(1199145600+rand()*(1375228800-1199145600+1));
set _date = FROM_UNIXTIME(_time, '%Y-%m-%d %H:%i:%s' );

update review set created_at = _date  WHERE review_id = _review_id;
end loop cursor_loop;
close rs_cursor;
END;

call updatetime();

SELECT FLOOR(1199145600+rand()*(1375228800-1199145600+1));

在俩个时间戳之间，随机取一个时间戳.

SELECT FROM_UNIXTIME(_time, '%Y-%m-%d %H:%i:%s' );

格式化时间戳