How to Add Custom Methods to Your Spring Data JPA Repositories?

Customizing Spring Data JPA with Custom Methods

When working with Spring Data JPA, developers often leverage the built-in crud and finder functionalities provided by the underlying framework. However, there may be instances where customizing a finder or adding entirely new methods is necessary. This article addresses how to add a custom method with its implementation for a given Spring Data JPA repository interface.

The Repository Interface

In the example provided, the AccountRepository interface extends the JpaRepository with parametrized types Account and Long, indicating that it operates on Account entities with a primary key of type Long. Additionally, a custom finder method called findByCustomer is defined using the @Query annotation, which enables custom JPQL queries to be executed.

Adding a Custom Method

To fully customize the repository, create a separate interface like this:

public interface AccountRepositoryCustom {
    public void customMethod();
}

This interface declares the custom method customMethod().

Implementation of the Custom Method

An implementation class for the custom interface must be provided:

public class AccountRepositoryImpl implements AccountRepositoryCustom {

    @Autowired
    private AccountRepository accountRepository;

    public void customMethod() {
        // Implementation goes here
    }
}

In this example, the AccountRepository is autowired into the AccountRepositoryImpl class, allowing any repository methods to be invoked within the customMethod() implementation if needed.

Referencing the Custom Interface

The final step involves referencing the custom interface in the original AccountRepository interface:

public interface AccountRepository extends JpaRepository<account long>, AccountRepositoryCustom {}</account>

By extending both JpaRepository and AccountRepositoryCustom, the AccountRepository interface combines the built-in repository methods with the custom method defined in the AccountRepositoryCustom interface.

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