category_id 的設置

<!--结果映射-->
<resultMap id="rmGoods" type="com.imooc.mybatis.dto.GoodsDTO">
    <!--设置主键字段与属性映射-->
    <id property="goods.goodsId" column="goods_id"></id>
    <!--设置非主键字段与属性映射-->
    <result property="goods.title" column="title"></result>
    <result property="goods.originalCost" column="original_cost"></result>
    <result property="goods.currentPrice" column="current_price"></result>
    <result property="goods.discount" column="discount"></result>
    <result property="goods.isFreeDelivery" column="is_free_delivery"></result>
    <result property="goods.categoryId" column="category_id"></result>
    
    <result property="category.categoryId" column="category_id"></result>
    
    <result property="category.categoryName" column="category_name"></result>
    <result property="category.parentId" column="parent_id"></result>
    <result property="category.categoryLevel" column="category_level"></result>
    <result property="category.categoryOrder" column="category_order"></result>

    <result property="test" column="test"/>
</resultMap>

<result property="category.categoryId" column="category_id"></result>

關於category.categoryId的映射是否也需要用主鍵的方式 <id .......>?