mybatis返回map结果集

今天突发奇想，想用mybatis返回一个map结果集，结果我就整了一下午，不过终于解决了

1、如果你确定返回的数据只有一条，你可以这样整
xml中：
<select id="searchncomedateByInvestID" resultMap="java.util.HashMap">
    select
    t1.invest_id                      ,
    cast(t1.modify_time AS DATE) modify_time
    from t_c_wh_redeeminfo t1
    where 1=1
    and t1.invest_id =#{investId}
</select>
dao中：
Map<String,Object> searchncomedateByInvestID(investId);

2、如果返回的是多条数据，可以这样整
xml中：
<resultMap id="getAllSetDaysResult"   type="HashMap">
        <result property="investid" column="invest_id" jdbcType="VARCHAR" />
        <result property="modifytime" column="modify_time" jdbcType="DATE"/>

</resultMap>
<select id="searchncomedateByInvestID" parameterType="java.util.List" resultMap="getAllSetDaysResult">
    select
    t1.invest_id                      ,
    cast(t1.modify_time AS DATE) modify_time
    from t_c_wh_redeeminfo t1
    where 1=1
    and t1.invest_id in
    <foreach collection="list" item="investId" index="index"  open="(" close=")" separator=",">
        #{investId}
    </foreach>
</select>
dao中：
List<Map<String, Object>> searchncomedateByInvestID(List<String> preinvestList);