master：商城档口首页，当jumpType为3，且没有设置商品图片时，默认返回当前商品第一张主图；

xkt/src/main/resources/mapper/StoreHomepageMapper.xml

@@ -5,11 +5,15 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 <mapper namespace="com.ruoyi.xkt.mapper.StoreHomepageMapper">
 
     <select id="selectTopLeftList">
-        SELECT DISTINCT
+        SELECT
             sh.biz_id,
             sh.jump_type,
-            sf.file_url,
-            sh.order_num
+            sh.order_num,
+            CASE WHEN sh.jump_type = 3 AND sh.file_id IS NULL THEN
+                    (SELECT sf1.file_url FROM store_product_file spf JOIN sys_file sf1 ON spf.file_id = sf1.id AND spf.file_type = 1 AND spf.order_num = 1
+                        WHERE spf.del_flag = 0 AND spf.store_prod_id = sh.biz_id)
+                ELSE sf.file_url
+                END AS file_url
         FROM
             store_homepage sh
                 LEFT JOIN sys_file sf ON sh.file_id = sf.id
@@ -17,6 +21,8 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
             sh.del_flag = 0
             AND sh.file_type = 1
             AND sh.store_id = #{storeId}
+        ORDER BY
+            sh.order_num
     </select>
 
 </mapper>