mysql的DateDiff函数查询两个日期的差的函数用于算两个日期的差距

例子
<!-- 查询开标时间在的当天内的招标项目-->
<select id="queryBidopenToday" resultMap="BaseResultMap" >
   select
   <include refid="Base_Column_List" />
   from cpu_bid_project
   where dr=0
   and enterprise_id= #{enterpriseId,jdbcType=BIGINT}
   and DateDiff(bid_open_time,now())=0
</select>