select id, community_id, discount, integral, creation_time, update_time from volunteer_community_discount where community_id=#{communityId} order by creation_time desc insert into volunteer_community_discount id, community_id, discount, integral, creation_time values #{item.id}, #{item.communityId}, #{item.discount}, #{item.integral}, sysdate() update volunteer_community_discount id=#{item.id}, community_id=#{item.communityId}, discount=#{item.discount}, integral=#{item.integral}, update_time=sysdate() where id = #{item.id} delete from volunteer_community_discount where id=#{id}