如何向Spring Data JPA添加自定义方法

问题描述

我正在研究Spring Data JPA。考虑下面的示例，我将默认使用所有crud和finder功能，如果我想自定义查找器，那么也可以在界面本身轻松完成。

I am looking into Spring Data JPA. Consider the below example where I will get all the crud and finder functionality working by default and if I want to customize a finder then that can be also done easily in the interface itself.

@Transactional(readOnly = true)
public interface AccountRepository extends JpaRepository<Account, Long> {

  @Query("<JPQ statement here>")
  List<Account> findByCustomer(Customer customer);
}

我想知道如何添加完整的自定义方法及其实现对于上面的AccountRepository？由于它是一个接口，我无法在那里实现该方法。

I would like to know how can I add a complete custom method with its implementation for the above AccountRepository? Since its an Interface I cannot implement the method there.

推荐答案

您需要为自定义方法创建一个单独的接口：

You need to create a separate interface for your custom methods:

public interface AccountRepository
    extends JpaRepository<Account, Long>, AccountRepositoryCustom { ... }

public interface AccountRepositoryCustom {
    public void customMethod();
}

并为该界面提供实现类：

and provide an implementation class for that interface:

public class AccountRepositoryImpl implements AccountRepositoryCustom {

    @Autowired
    AccountRepository accountRepository;  /* Optional - if you need it */

    public void customMethod() { ... }
}

参见：

• 。

  Note that the naming scheme has changed between versions. See https://stackoverflow.com/a/52624752/66686 for details.

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