Spring 启动，在抽象服务中存储 CRUD 操作

Question

I have two JPA entites like

@Entity
@Table(name = "A")
public class A {...}

@Entity
@Table(name = "B")
public class B {...}

And services like

@Service
public class AServiceImpl implements AService {

    @Autowired
    private ARepository aRepository;
    
    public void create() {...}
    public void update(long id) {...}
    public void doA() {...}

}

@Service
public class BServiceImpl implements BService {

    @Autowired
    private BRepository bRepository;
    
    public void create() {...}
    public void update(long id) {...}
    public void doB() {...}

}

So, in methods create and update I have code what differs only by repository. I would like to store crud methods in some other, basic service, but do not really understand how could I manage repository inheritance. Any help, please.

Answer 1

IMP: This code is compiling, I havent tested it.

I think you can use Genarics over here.

public class RepositoryService <R extends JpaRepository<T, Long>, T> {

  @Autowired R repository;

  public void insert(T object) {
    repository.save(object);
  }

}

How to effectively use these reporitories, that details you can refer to this baeldung article - https://www.baeldung.com/spring-autowire-generics

Update: This is an alternate approach you can try out

public abstract class RepositoryService <T>{

  abstract Class getRepositoryClass();

  Map<Class, GenericRepository> repositories;

  @Autowired
  List<GenericRepository> repositoriesList;

  @PostConstruct
  public void setupMap() {
    // Convert List into Map, with the class of Objest to be saved.
  }

  public void insert(T object) {
    repositories.get(object.getClass()).save(object);
  }

}