Spring Data JPA如何为实现公共接口的两个域类创建单个存储库？

Question

我有两个域类，分别是SubCategoryTierOne和SubCategoryTierTwo ，如下所述：

@Entity
public class SubCategoryTierOne implements ISubCategory
{

   /** The id. */

   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private long id;

   /** The name. */

   @NotNull
   private String name;

   /** The root. */

   @NotNull
   @ManyToOne
   private Category parent;

   /** The tier two sub categories. */
   @OneToMany(fetch = FetchType.LAZY, mappedBy = "parent", cascade = CascadeType.ALL)

//Getters and Setters
}

@Entity
public class SubCategoryTierTwo implements ISubCategory
{

   /** The id. */
   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private long id;

   /** The name. */

   @NotNull
   private String name;

   /** The root. */

   @NotNull
   @ManyToOne
   private SubCategoryTierOne parent;

   /** The tier three sub categories. */
   @OneToMany(fetch = FetchType.LAZY, mappedBy = "parent", cascade = CascadeType.ALL)
   private Set< SubCategoryTierThree > tierThreeSubCategories;

//Getters and Setters
}

因此，我不想为所有这些子类别创建单独的存储库，而是要创建一个公共存储库，因此所有这些域类都实现了标记接口ISubCategory 。

我创建了一个这样的存储库：

public interface SubCategoryTierOneRepository<T extends ISubCategory> extends JpaRepository< ISubCategory, Long >
{

}

但是，当我运行我的应用程序时，出现以下错误：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'subCategoryRepository': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: interface com.kyac.learning.domain.ISubCategory

有人可以告诉我我要去哪里了吗？

Answer 1

我了解这里的问题，但是您确定要执行类似的操作。 您可以重新考虑您的设计。

如果我是你，我会选择这样的东西。

@Entity
public class Category  {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

    @Column
    private String description;

    @Column(nullable = false, unique = true)
    private String label;

    @ManyToOne(fetch = FetchType.LAZY)
    private Category parent;

    @OneToMany(mappedBy = "parent", cascade = CascadeType.ALL)
    private Set<Category> children = new HashSet<>();
}