1.流程分析



首页                    ——————ajax——————>       首页商品推荐



index.html          <——销量最高的三个商品——---               接口



推荐规则:1.根据当前用户的最近搜索进行推荐



     2.查询销量最高的商品进行推荐



     3.根据平台管理员设置的需要推荐的商品



     4.查询最新上架的商品进行推荐



2.数据库实现



商品推荐算法:推荐最新上架的商品



说明:商品推荐算法是根据多个维度进行权重计算,计算出一个匹配值



(1)数据表分析及数据准备



(2)sql



#连接查询:
#商品推荐:查询最新上架的商品
#通过创建时间排序查找product表,只查询前三条
SELECT * FROM product p INNER JOIN product_img pimg
ON p.product_id = pimg.item_id
ORDER BY p.create_time DESC LIMIT 0,3

#子查询:
#商品推荐:查询最新上架的商品
SELECT * FROM product ORDER BY create_time DESC LIMIT 0,3;
#子查询:根据商品id查询商品图片
SELECT * FROM product_img WHERE item_id=2;



 (3)在beans子工程entity包创建ProductVO,相比较Product新增了List<ProductImg> imgs,用于存储商品的图片。



public class ProductVO {
    /**
     * 商品主键id
     */
    @Id
    @Column(name = "product_id")
    private String productId;

    /**
     * 商品名称 商品名称
     */
    @Column(name = "product_name")
    private String productName;

    /**
     * 分类外键id 分类id
     */
    @Column(name = "category_id")
    private Integer categoryId;

    /**
     * 一级分类外键id 一级分类id,用于优化查询
     */
    @Column(name = "root_category_id")
    private Integer rootCategoryId;

    /**
     * 销量 累计销售
     */
    @Column(name = "sold_num")
    private Integer soldNum;

    /**
     * 默认是1,表示正常状态, -1表示删除, 0下架 默认是1,表示正常状态, -1表示删除, 0下架
     */
    @Column(name = "product_status")
    private Integer productStatus;

    /**
     * 创建时间
     */
    @Column(name = "create_time")
    private Date createTime;

    /**
     * 更新时间
     */
    @Column(name = "update_time")
    private Date updateTime;
    
    
    
    private List<ProductImg> imgs;

    public List<ProductImg> getImgs() {
        return imgs;
    }

    public void setImgs(List<ProductImg> imgs) {
        this.imgs = imgs;
    }

    /**
     * 商品内容 商品内容
     */
    private String content;

    /**
     * 获取商品主键id
     *
     * @return product_id - 商品主键id
     */
    public String getProductId() {
        return productId;
    }

    /**
     * 设置商品主键id
     *
     * @param productId 商品主键id
     */
    public void setProductId(String productId) {
        this.productId = productId;
    }

    /**
     * 获取商品名称 商品名称
     *
     * @return product_name - 商品名称 商品名称
     */
    public String getProductName() {
        return productName;
    }

    /**
     * 设置商品名称 商品名称
     *
     * @param productName 商品名称 商品名称
     */
    public void setProductName(String productName) {
        this.productName = productName;
    }

    /**
     * 获取分类外键id 分类id
     *
     * @return category_id - 分类外键id 分类id
     */
    public Integer getCategoryId() {
        return categoryId;
    }

    /**
     * 设置分类外键id 分类id
     *
     * @param categoryId 分类外键id 分类id
     */
    public void setCategoryId(Integer categoryId) {
        this.categoryId = categoryId;
    }

    /**
     * 获取一级分类外键id 一级分类id,用于优化查询
     *
     * @return root_category_id - 一级分类外键id 一级分类id,用于优化查询
     */
    public Integer getRootCategoryId() {
        return rootCategoryId;
    }

    /**
     * 设置一级分类外键id 一级分类id,用于优化查询
     *
     * @param rootCategoryId 一级分类外键id 一级分类id,用于优化查询
     */
    public void setRootCategoryId(Integer rootCategoryId) {
        this.rootCategoryId = rootCategoryId;
    }

    /**
     * 获取销量 累计销售
     *
     * @return sold_num - 销量 累计销售
     */
    public Integer getSoldNum() {
        return soldNum;
    }



(4)mapper接口定义操作方法

ProductMapper :



public interface ProductMapper extends GeneralDAO<Product> {
    public List<ProductVO> selectRecommendProducts();

}



ProductImgMapper :



public interface ProductImgMapper extends GeneralDAO<ProductImg> {
  //根据商品id查询当前商品的图片信息
    public List<ProductImg> selectProductImgByProductId(int productId);
}





ProductMapper :



<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.qfedu.fmmall.dao.ProductMapper">
  <resultMap id="BaseResultMap" type="com.qfedu.fmmall.entity.Product">
    <id column="product_id" jdbcType="VARCHAR" property="productId" />
    <result column="product_name" jdbcType="VARCHAR" property="productName" />
    <result column="category_id" jdbcType="INTEGER" property="categoryId" />
    <result column="root_category_id" jdbcType="INTEGER" property="rootCategoryId" />
    <result column="sold_num" jdbcType="INTEGER" property="soldNum" />
    <result column="product_status" jdbcType="INTEGER" property="productStatus" />
    <result column="create_time" jdbcType="TIMESTAMP" property="createTime" />
    <result column="update_time" jdbcType="TIMESTAMP" property="updateTime" />
    <result column="content" jdbcType="LONGVARCHAR" property="content" />
  </resultMap>

  <resultMap id="ProductVOMap" type="com.qfedu.fmmall.entity.ProductVO">
    <id column="product_id" jdbcType="VARCHAR" property="productId" />
    <result column="product_name" jdbcType="VARCHAR" property="productName" />
    <result column="category_id" jdbcType="INTEGER" property="categoryId" />
    <result column="root_category_id" jdbcType="INTEGER" property="rootCategoryId" />
    <result column="sold_num" jdbcType="INTEGER" property="soldNum" />
    <result column="product_status" jdbcType="INTEGER" property="productStatus" />
    <result column="create_time" jdbcType="TIMESTAMP" property="createTime" />
    <result column="update_time" jdbcType="TIMESTAMP" property="updateTime" />
    <result column="content" jdbcType="LONGVARCHAR" property="content" />
    <collection property="imgs" select="com.qfedu.fmmall.dao.ProductImgMapper.selectProductImgByProductId" column="product_id"/>
  </resultMap>

  <select id="selectRecommendProducts" resultMap="ProductVOMap">
    SELECT
      product_id,
      product_name,
      category_id,
      root_category_id,
      sold_num,
      product_status,
      content,
      create_time,
      update_time
    FROM product
    ORDER BY create_time DESC
    LIMIT 0,3;
  </select>
</mapper>



ProductImgMapper :



<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.qfedu.fmmall.dao.ProductImgMapper">
  <resultMap id="BaseResultMap" type="com.qfedu.fmmall.entity.ProductImg">
    <id column="id" jdbcType="VARCHAR" property="id" />
    <result column="item_id" jdbcType="VARCHAR" property="itemId" />
    <result column="url" jdbcType="VARCHAR" property="url" />
    <result column="sort" jdbcType="INTEGER" property="sort" />
    <result column="is_main" jdbcType="INTEGER" property="isMain" />
    <result column="created_time" jdbcType="TIMESTAMP" property="createdTime" />
    <result column="updated_time" jdbcType="TIMESTAMP" property="updatedTime" />
  </resultMap>

  <select id="selectProductImgByProductId" resultMap="BaseResultMap">
    SELECT
       id,
       item_id,
       url,
       sort,
       is_main,
       created_time,
       updated_time
    FROM product_img WHERE item_id=#{productId};
  </select>
</mapper>



测试:



@RunWith(SpringRunner.class)
@SpringBootTest(classes = ApiApplication.class)

public class ApiApplicationTests {

    @Autowired
    private ProductMapper productMapper;

    @Test
    public void testRecommend(){
        List<ProductVO> productVOS = productMapper.selectRecommendProducts();
        for (ProductVO p:productVOS) {
            System.out.println(p);
        }
    }

}



 3.业务层实现



  ProductService



public interface ProductService {
    public ResultVO listRecommendProducts();

}



ProductServiceImpl



@Service
public class ProductServiceImpl implements ProductService {

    @Autowired
    private ProductMapper productMapper;

    public ResultVO listRecommendProducts() {
        List<ProductVO> productVOS = productMapper.selectRecommendProducts();
        ResultVO resultVO = new ResultVO(ResStatus.OK, "success", productVOS);
        return resultVO;
    }
}



IndexController:



@RestController
@CrossOrigin
@RequestMapping("/index")
@Api(value = "提供首页数据显示所需的接口",tags = "首页管理")
public class IndexController {

    @Autowired
    private IndexImgService indexImgService;
    @Autowired
    private CategoryService categoryService;
    @Autowired
    private ProductService productService;

    @GetMapping("/indeximg")
    @ApiOperation("首页轮播图接口")
    public ResultVO listIndexImgs(){
        return indexImgService.listIndexImgs();
    }


    @GetMapping("/category-list")
    @ApiOperation("商品分类查询接口")
    public ResultVO listCategory(){
        return categoryService.listCategories();
    }

    @GetMapping("/list-recommends")
    @ApiOperation("查询推荐商品的接口")
    public ResultVO listRecommendProducts(){
        return productService.listRecommendProducts();
    }
}




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