(Spring/JpaRepository) 从 BaseEntityRepository 到 SubEntityRepository 继承 JpaRepository 的方法

问题描述

以下情况的最佳做法是什么?

What would be the best practice for the following case?

您有以下实体:

@Entity public class BaseEntity { }
@Entity public class SubEntity extends BaseEntity { }

并且您有一个用于 BaseEntity 的 JpaRepository，具有多个选择方法:

And you have a JpaRepository for BaseEntity having multiple select-methods:

public interface BaseEntityRepository extends JpaRepository<BaseEntity, Long> {
  Set<BaseEntity> findAll();
  Set<BaseEntity> findSome...();
}

现在您需要一个 JpaRepository 用于继承 BaseEntityRepository 的所有方法的 SubEntity.

Now you want a JpaRepository for SubEntity inheriting all the methods from BaseEntityRepository.

现在我想象了多个场景，我不确定哪一个是最好的或者哪些应该起作用:

Now I imagine multiple scenarios, from whom I am not sure which one is the best or which ones should work:

(a) 使用完全相同的方法为 SubEntity 创建一个新的独立 JpaRepository，但用 SubEntity 替换 BaseEntity:

(a) Create a new independent JpaRepository for SubEntity with exactly the same Methods, but substituing BaseEntity with SubEntity:

public interface SubEntityRepository extends JpaRepository<SubEntity, Long> {
  Set<SubEntity> findAll();
  Set<SubEntity> findSome...();
}

(b) 扩展 BaseEntityRepository，所有方法都应该被继承，但它仍然返回 BaseEntity-objects 而不是 SubEntity-objects

(b) Extending BaseEntityRepository, all Methods should be inherited, but it still return BaseEntity-objects instead of SubEntity-objects

public interface SubEntity extends BaseEntityRepository {
}

我不太喜欢这两种解决方案中的任何一种.你会如何解决这个问题?

I don't really like any of both solutions. How would you solve this?

不知何故，我认为 JpaRepository 不适合这个用例?

Somehow I think JpaRepository is not ment for this use-case?

推荐答案

您可以参数化您的 BaseEntityRepository 并对这些参数进行操作.

You could parameterize your BaseEntityRepository and operate on those parameters.

public interface BaseEntityRepository<T, I> extends JpaRepository<T, I> {
  Set<T> findAll();
  Set<T> findSome...();
}

然后通过扩展 BaseEntityRepository

public interface SubEntityRepository extends BaseEntityRepository<SubEntity, Long> {
  ...
}

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