Hibernate 5.x和Spring Data 2.x :如何在服务保存方法中更新原始对象

// 实体类
@Entity
@Table(name = "my_table")
public class MyEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    
    private String name;
    
    // 省略其他属性和方法
}

// Repository接口
public interface MyEntityRepository extends JpaRepository<MyEntity, Long> {
    // 保存方法
    MyEntity saveOrUpdate(MyEntity entity);
}

// 服务类
@Service
public class MyService {
    @Autowired
    private MyEntityRepository repository;
    
    public MyEntity saveOrUpdateEntity(Long id, String newName) {
        MyEntity entity = repository.findById(id).orElse(null);
        
        if (entity != null) {
            entity.setName(newName);
            entity = repository.saveOrUpdate(entity);
        }
        
        return entity;
    }
}