添加了子分类的查询方法

src/main/java/icu/sunway/ai_spring_example/Controllers/ProductController.java

@@ -121,11 +121,20 @@ public class ProductController {
     }
 
     /**
-     * 查询所有商品分类（树形结构）
+     * 查询所有顶级商品分类（树形结构）
      */
     @GetMapping("/category")
     public ResponseEntity<List<ProductCategory>> getAllCategories() {
-        List<ProductCategory> categories = categoryService.getAllCategories();
+        List<ProductCategory> categories = categoryService.getAllTopCategories();
+        return ResponseEntity.success(categories);
+    }
+
+    /**
+     * 查询子级商品分类
+     */
+    @GetMapping("/category/{id}")
+    public ResponseEntity<List<ProductCategory>> getChildCategories(@PathVariable Long id) {
+        List<ProductCategory> categories = categoryService.getChildCategories(id);
         return ResponseEntity.success(categories);
     }
 }

src/main/java/icu/sunway/ai_spring_example/Service/Impl/ProductCategoryServiceImpl.java

@@ -73,8 +73,18 @@ public class ProductCategoryServiceImpl extends ServiceImpl<ProductCategoryMappe
     }
 
     @Override
-    public List<ProductCategory> getAllCategories() {
+    public List<ProductCategory> getAllTopCategories() {
         QueryWrapper<ProductCategory> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq("is_deleted", 0)
+                .eq("level",1);
+        return categoryMapper.selectList(queryWrapper);
+    }
+
+    @Override
+    public List<ProductCategory> getChildCategories(Long id) {
+        QueryWrapper<ProductCategory> queryWrapper = new QueryWrapper<>();
+        queryWrapper.eq("is_deleted", 0)
+                .eq("parent_id", id);
         return categoryMapper.selectList(queryWrapper);
     }
 }

src/main/java/icu/sunway/ai_spring_example/Service/ProductCategoryService.java

@@ -29,5 +29,7 @@ public interface ProductCategoryService extends IService<ProductCategory> {
      * 查询所有分类（树形结构）
      * @return 分类列表
      */
-    List<ProductCategory> getAllCategories();
+    List<ProductCategory> getAllTopCategories();
+
+    List<ProductCategory> getChildCategories(Long id);
 }

src/main/resources/mapper/ProductMapper.xml

@@ -9,10 +9,17 @@
         FROM product p
         LEFT JOIN product_category c ON p.category_id = c.id
         WHERE p.is_deleted = 0
-        <if test="categoryId != null">AND p.category_id = #{categoryId}</if>
+        <if test="categoryId != null">
+            AND (
+            p.category_id = #{categoryId}
+            OR p.category_id IN (
+            SELECT id FROM product_category WHERE parent_id = #{categoryId} AND is_deleted = 0
+            )
+            )
+        </if>
         <if test="name != null and name != ''">AND p.name LIKE CONCAT('%', #{name}, '%')</if>
         <if test="status != null">AND p.status = #{status}</if>
         ORDER BY p.sort ASC, p.create_time DESC
     </select>
 
-</mapper>
+</mapper>