扩展`JpaRepository`，但只实现子接口

public interface CustomJpaRepository extends JpaRepository<User, Long> {
    // 添加自定义方法
}

public interface CustomJpaRepository extends JpaRepository<User, Long> {
    List<User> findByAgeGreaterThan(int age);
    List<User> findByLastName(String lastName);
    // 添加更多自定义方法
}

public interface CustomJpaRepository extends JpaRepository<User, Long> {
    List<User> findByAgeGreaterThan(int age);
    
    @Query("SELECT u FROM User u WHERE u.lastName = :lastName")
    List<User> findByLastName(@Param("lastName") String lastName);
    
    // 添加更多自定义方法
}

@Service
public class UserService {
    private final CustomJpaRepository userRepository;
    
    public UserService(CustomJpaRepository userRepository) {
        this.userRepository = userRepository;
    }
    
    public List<User> getUsersByAgeGreaterThan(int age) {
        return userRepository.findByAgeGreaterThan(age);
    }
    
    // 添加更多服务方法
}