对于mybatis查询结果返回类型的理解

<resultMap type="Product" >
<id column="product_id" property="productId" />
<result column="product_name" property="productName" />
<result column="product_desc" property="productDesc" />
<result column="img_addr" property="imgAddr" />
<result column="normal_price" property="normalPrice" />
<result column="promotion_price" property="promotionPrice" />
<result column="priority" property="priority" />
<result column="create_time" property="createTime" />
<result column="last_edit_time" property="lastEditTime" />
<result column="enable_status" property="enableStatus" />
<association property="shop" column="shop_id" javaType="Shop">
<id column="shop_id" property="shopId" />
<result column="owner_id" property="ownerId" />
<result column="shop_name" property="shopName" />
</association>
<association property="productCategory" column="product_category_id"
javaType="ProductCategory">
<id column="product_category_id" property="productCategoryId" />
<result column="product_category_name" property="productCategoryName" />
</association>
<collection property="productImgList" column="product_id"
ofType="ProductImg">
<id column="product_img_id" property="productImgId" />
<result column="detail_img" property="imgAddr" />
<result column="img_desc" property="imgDesc" />
<result column="priority" property="priority" />
<result column="create_time" property="createTime" />
<result column="product_id" property="productId" />
</collection>
</resultMap>

<select resultMap="productMap"
parameterType="Long">
<!-- 具体的sql -->
SELECT
p.product_id,
p.product_name,
p.product_desc,
p.img_addr,
p.normal_price,
p.promotion_price,
,
p.create_time,
p.last_edit_time,
p.enable_status,
p.product_category_id,
p.shop_id,
pm.product_img_id,
pm.img_addr AS detail_img,
pm.img_desc,
,
pm.create_time
FROM
tb_product p
LEFT JOIN
tb_product_img pm
ON
p.product_id =
pm.product_id
WHERE
p.product_id =
#{productId}
ORDER BY
DESC