按时间查询数据（时间存储的格式是unix时间戳）

SELECT *
FROM `pre_common_member_log_w`
WHERE DATE_FORMAT( FROM_UNIXTIME( dateline ) , '%Y-%m-%d' ) = DATE_FORMAT( NOW( ) , '%Y-%m-%d' )
LIMIT 0 , 30

SELECT *
FROM `pre_common_member_log_w`
WHERE DATE_FORMAT( FROM_UNIXTIME( dateline ) , '%Y-%m-%d' ) = '2014-10-23'
LIMIT 0 , 30



SELECT DATE_FORMAT( FROM_UNIXTIME( dateline ) , '%Y-%m-%d' ) AS mytime, title
FROM `pre_common_member_log_w`
WHERE DATE_FORMAT( FROM_UNIXTIME( dateline ) , '%Y-%m-%d' ) = '2014-10-23'
LIMIT 0 , 30