mybatis 关联关系查询 java

<mapper namespace="com.rrz.modules.awardrecord.dao.CheckAwardsDao">
<resultMap type="com.rrz.modules.awardrecord.entity.CheckAwards" id="checkAwardsMap">
<id property="id" column="id"/>
<result property="custId" column="cust_id"/>
</resultMap>

<select id="getCheckAward" parameterType="com.rrz.modules.awardrecord.entity.CheckAwards" resultMap="checkAwardsMap">
SELECT a.id,a.cust_id FROM check_awards a WHERE a.id = #{id} AND a.cust_id = #{custId}
</select>

</mapper>

<mapper namespace="com.rrz.modules.awardrecord.dao.CheckAwardspicsDao">

<resultMap type="com.rrz.modules.awardrecord.entity.CheckAwardspics" id="checkAwardspicsMap">
<result property="picUrl" column="picurl"/>
</resultMap>

<select id="getCheckAwardPics" parameterType="com.rrz.modules.awardrecord.entity.CheckAwardspics" resultMap="checkAwardspicsMap">
SELECT b.picurl FROM check_awardspics b WHERE b.award_id = #{awardId}
</select>

</mapper>

public class CheckAwardVo{

private CheckAwards checkAwards;
private List<CheckAwardspics> pics;

public List<CheckAwardspics> getPics() {
return pics;
}

public void setPics(List<CheckAwardspics> pics) {
this.pics = pics;
}

public CheckAwards getCheckAwards() {
return checkAwards;
}

public void setCheckAwards(CheckAwards checkAwards) {
this.checkAwards = checkAwards;
}

}

public CheckAwardVo getCheckAwardVo(CheckAwards checkAwards){
CheckAwardVo vo = new CheckAwardVo();
checkAwards = checkAwardsDao.getCheckAward(checkAwards);
vo.setCheckAwards(checkAwards);
CheckAwardspics pic = new CheckAwardspics();
if(checkAwards!=null){
pic.setAwardId(checkAwards.getId());
}
List<CheckAwardspics> list = checkAwardspicsDao.getCheckAwardPics(pic);
vo.setPics(list);
return vo;
}

CheckAwardVo pics=awardRecordService.getCheckAwardVo(checkAwardsB);

m.addAttribute("pics", pics.getPics());