mybatis关联查询有两个关键词，association是用于一对一和多对一，而collection是用于一对多的关系。本文主要介绍collection的用法。
首先看一下页面要求的数据的格式：
//获取端子信息
List<Map<String, Object>> portList = doneTaskDao.queryTroubleTaskPort(map);
<resultMap id="troubleTaskPortMap" type="Map" >
<result column="PORT_ID" property="PORT_ID"/>
<result column="PORT_NO" property="PORT_NO"/>
<result column="EQP_NO" property="EQP_NO"/>
<result column="EQP_NAME" property="EQP_NAME"/>
<result column="GLBM" property="GLBM"/>
<result column="GLMC" property="GLMC"/>
<result column="TASK_ID" property="TASK_ID"/>
<collection property="portCheckedList" column="{TASK_ID=TASK_ID,PORT_ID=PORT_ID}" select="getPortCheckedList"></collection>
</resultMap>
<select id="queryTroubleTaskPort" parameterType="map" resultMap="troubleTaskPortMap">
select distinct r.port_id,
r.port_no,
r.eqp_no,
r.eqp_name,
td.glbm,
td.glmc,
r.task_id
from tb_cablecheck_record r, tb_cablecheck_taskdetail td
where r.detail_id = td.detail_id
and td.inspect_object_type = 1
and r.task_id = #{TASK_ID}
order by to_number(regexp_substr(r.port_no, '[0-9]*[0-9]', 1)),
to_number(regexp_substr(r.port_no, '[0-9]*[0-9]', 3))
</select>
<select id="getPortCheckedList" parameterType="map" resultType="map">
select r.record_id,
r.record_type,
r.descript,
(select bs.staff_name from TB_BASE_STAFF bs where bs.staff_id=r.create_staff) create_staff,
r.create_time,
decode(r.ischeckok, 0, '合格', '不合格') ischeckok,
p.photo_path,
p.micro_photo_path
from TB_CABLECHECK_RECORD r left join TB_CABLECHECK_PHOTO_REL pr on r.record_id=pr.object_id
left join tb_cablecheck_photo p on p.photo_id=pr.photo_id
where r.port_id = #{PORT_ID}
and r.task_id = #{TASK_ID}
</select>