建议实现两个实体之间有很多关系的搜索过滤器

Question

我想实现/搜索rest方法，它将过滤给定参数的Product对象，并返回一组可过滤的产品。

我正在阅读有关规范界面和Criteria API的信息，但我在实施解决方案时遇到了困难。

产品实体：

@Entity
public class Product implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long productId;

    @NotEmpty(message = "The product name must not be null.")
    private String productName;

    private String productDescription;

    @Min(value = 0, message = "The product price must no be less then zero.")
    private double productPrice;

    @Min(value = 0, message = "The product unit must not be less than zero.")
    private int unitInStock;

    @ManyToMany
    @JoinTable(name = "category_product", joinColumns = @JoinColumn(name = "product_id"), inverseJoinColumns = @JoinColumn(name = "category_id"))
    private Set<Category> categories = new HashSet<>();

因为我希望用户能够按类别名称进行搜索，所以床边价格范围和unitInStock是单独的实体并且它与@ManyToMany关系链接，我希望有一个看起来像这样的方法：

@GetMapping("/search")
    public ResponseEntity<Set<Product>> advancedSearch(@RequestParam(name="category") String categoryName,
                                                       @RequestParam(name="price") double price,
                                                       @RequestParam(name="unitInStock") int unitInStock  ){

    }

类别实体：

@Entity
public class Category implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long categoryId;

    @NotEmpty(message = "Can not be null")
    private String CategoryName;

    @ManyToMany(mappedBy = "categories")
    @JsonBackReference
    private Set<Product> products = new HashSet<>();

Answer 1

使用JPQL查询方法创建spring存储库：

@Query("select p from Product p left join p.categories c where c.CategoryName like ?1 and p.productPrice=?2 and p.unitInStock=?3")
List<Product> search(String categoryName, double price, int unitInStock)