如下面代码所示，sql可以正常返回求和信息，mybatis为什么会回null ，是不是我的mapper映射有问题？？？

• dao

public class CaseListInfo {
    private Integer id;

    private String courtName;

    private String departName;

    private String judgeName;

    private Integer info1;

    private Integer info2;

    private Integer info3;

    private Integer info4;

    private Integer info5;

    private Integer info6;

    private Integer info7;

    private Integer info8;

    private Integer info9;

    private Integer info10;

    private Integer info11;

    private Integer info12;

    private String sMonth;

    private String sYear;
......
}

• sql语句,正常返回求和

SELECT
    court_name,
    depart_name,
    SUM(info_1),
    SUM(info_2)
FROM
    caselist_info
WHERE
    court_name = '***人民法院'
AND id IS NOT NULL
GROUP BY
    court_name,
    depart_name

• Mappr 文件

  <resultMap id="departByCourtNameMap" type="com.yshow.web.pojo.CaseListInfo">
        <result column="id" property="id" jdbcType="INTEGER"/>
        <result column="court_name" property="courtName" jdbcType="VARCHAR"/>
        <result column="depart_name" property="departName" jdbcType="VARCHAR"/>
        <result column="info_1" property="info1" jdbcType="INTEGER"/>
        <result column="info_2" property="info2" jdbcType="INTEGER"/>
        <result column="info_3" property="info3" jdbcType="INTEGER"/>
        <result column="info_4" property="info4" jdbcType="INTEGER"/>
        <result column="info_5" property="info5" jdbcType="INTEGER"/>
        <result column="info_6" property="info6" jdbcType="INTEGER"/>
        <result column="info_7" property="info7" jdbcType="INTEGER"/>
        <result column="info_8" property="info8" jdbcType="INTEGER"/>
        <result column="info_9" property="info9" jdbcType="INTEGER"/>
        <result column="info_10" property="info10" jdbcType="INTEGER"/>
        <result column="info_11" property="info11" jdbcType="INTEGER"/>
        <result column="info_12" property="info12" jdbcType="INTEGER"/>
        <result column="s_month" property="sMonth" jdbcType="VARCHAR"/>
        <result column="s_year" property="sYear" jdbcType="VARCHAR"/>
    </resultMap>

    <select id="selectDepartByCourtNameThisMonth" resultMap="departByCourtNameMap" parameterType="string">
        SELECT
        id, court_name, depart_name,
        SUM(info_1) , SUM(info_2),
        SUM(info_3), SUM(info_4), SUM(info_5),
        SUM(info_6), SUM(info_7), SUM(info_8),
        SUM(info_9), SUM(info_10), SUM(info_11),
        SUM(info_12), s_month, s_year
        FROM caselist_info
        <where>
            <if test="courtName != null">
                and court_name = #{courtName}
            </if>
        </where>
        GROUP BY
        court_name,
        depart_name
    </select>