第一步：LiveRateMapper裡面定義查詢方法：

通過物件作為引數查詢物件集合

List<LiveRatePage> findAllLiveRate(LiveRatePage liveRatePage);

第二步：根據查詢條件寫出正確的sql語句：

select (@i:[email protected]+1) as rank,a.* from (select DATE_FORMAT(l.CREATE_DT , '%Y-%m-%d')CREATE_DT,l.DAY_AGE,l.FARMER_NAME,l.LIVE_RATE,l.AREA FROM liverate l WHERE
DATE_FORMAT(l.CREATE_DT , '%Y-%m-%d') >=DATE_FORMAT('2017-06-01','%Y-%m-%d')
and DATE_FORMAT(l.CREATE_DT , '%Y-%m-%d')<=DATE_FORMAT('2017-06-10','%Y-%m-%d')
ORDER BY l.LIVE_RATE desc
LIMIT 0,20)a,(select @i:=0) as it
;

第三步：LiveRateMapper.xml定義查詢語句：

改寫mybatis動態sql

<select id="findAllLiveRate" resultMap="BaseResultMap2" parameterType="com.znyq.wfCloud.admin.pageModel.LiveRatePage">
  select (@i:[email protected]+1) as rank,a.* from (select DATE_FORMAT(l.CREATE_DT , '%Y-%m-%d')CREATE_DT,l.DAY_AGE,l.FARMER_NAME,l.LIVE_RATE,l.AREA
     FROM liverate l
     WHERE 1 = 1
    <if test="date1 != null and ''!= date1">
          <![CDATA[ and  DATE_FORMAT(l.CREATE_DT, '%Y-%m-%d') >=DATE_FORMAT(#{date1},'%Y-%m-%d') ]]>
    </if>
     <if test="date2 != null and ''!= date2">
          <![CDATA[ and  DATE_FORMAT(l.CREATE_DT, '%Y-%m-%d') <=DATE_FORMAT(#{date2},'%Y-%m-%d') ]]>
    </if>
    ORDER BY l.LIVE_RATE desc
   limit #{curSize},#{pageSize})a,(select @i:=0) as it
        
 </select>

第四步：配置正確返回物件屬性

<resultMap id="BaseResultMap2" type="com.znyq.wfCloud.admin.pageModel.LiveRatePage" >
    <result column="rank" property="rank" jdbcType="VARCHAR" />
    <result column="DAY_AGE" property="dayAge" jdbcType="VARCHAR" />
    <result column="LIVE_RATE" property="liveRate" jdbcType="VARCHAR" />
    <result column="FARMER_NAME" property="farmerName" jdbcType="VARCHAR" />
    <result column="AREA" property="area" jdbcType="VARCHAR" />
    <result column="CREATE_DT" property="rankDate" jdbcType="VARCHAR" />
  </resultMap>

物件：LiveRatePage

屬性：private String dayAge;

     public String getDayAge() {

        return dayAge;
    }

    public void setDayAge(String dayAge) {
        this.dayAge = dayAge;
    }

ps物件的其他屬性和set,get省略了，注意的地方我都標紅了查詢的id要唯一

返回的結果集配置id要唯一對應,查詢的列欄位和物件屬性要注意對應