<select id="A" parameterClass="java.util.Map"
resultMap="B">
XXX
</select>
<resultMap id="B" class="BXXXDTO">
XXX
<result property="fileNumOfItems" column="{conferenceID=conferenceID}" select="C"/>
</resultMap>
子查询如下:
<select id="C" parameterClass="java.util.HashMap" resultClass="CXXXDTO">
XXX
</select>