select * from expressitem where date(deliveryTime) between '2014-05-08' and '2014-05-09' 查出八号九号的时间段信息
select * from expressitem where deliveryTime between '2014-05-08' and '2014-05-09' 只查出八号的信息
select * from expressitem where date(deliveryTime)>=date('2014-05-08') and date(deliveryTime)<=date('2014-05-09') 查出八号九号的时间段信息