Spring Boot，将CRUD操作存储在抽象服务中

huangapple
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英文:

Spring boot, storing CRUD operations in abstract service

问题

我有两个 JPA 实体，如下所示：

  1. @Entity
  2. @Table(name = "A")
  3. public class A {...}
  5. @Entity
  6. @Table(name = "B")
  7. public class B {...}

还有以下服务：

  1. @Service
  2. public class AServiceImpl implements AService {
  4.     @Autowired
  5.     private ARepository aRepository;
  6.     
  7.     public void create() {...}
  8.     public void update(long id) {...}
  9.     public void doA() {...}
  11. }
  13. @Service
  14. public class BServiceImpl implements BService {
  16.     @Autowired
  17.     private BRepository bRepository;
  18.     
  19.     public void create() {...}
  20.     public void update(long id) {...}
  21.     public void doB() {...}
  23. }

因此，在方法create和update中，我有仅由仓库不同的代码。我想将 CRUD 方法存储在其他一些基本服务中，但实际上不太理解如何管理仓库继承。有任何帮助，谢谢。

英文:

I have two JPA entites like

  1. @Entity
  2. @Table(name = "A")
  3. public class A {...}
  5. @Entity
  6. @Table(name = "B")
  7. public class B {...}

And services like

  1. @Service
  2. public class AServiceImpl implements AService {
  4.     @Autowired
  5.     private ARepository aRepository;
  6.     
  7.     public void create() {...}
  8.     public void update(long id) {...}
  9.     public void doA() {...}
  11. }
  13. @Service
  14. public class BServiceImpl implements BService {
  16.     @Autowired
  17.     private BRepository bRepository;
  18.     
  19.     public void create() {...}
  20.     public void update(long id) {...}
  21.     public void doB() {...}
  23. }

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.

答案1

得分: 2

I think you can use Genarics over here.

  1. public class RepositoryService<R extends JpaRepository<T, Long>, T> {
  3.   @Autowired R repository;
  5.   public void insert(T object) {
  6.     repository.save(object);
  7.   }
  9. }

How to effectively use these repositories, 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

  1. public abstract class RepositoryService<T>{
  3.   abstract Class getRepositoryClass();
  5.   Map<Class, GenericRepository> repositories;
  7.   @Autowired
  8.   List<GenericRepository> repositoriesList;
  10.   @PostConstruct
  11.   public void setupMap() {
  12.     // Convert List into Map, with the class of Object to be saved.
  13.   }
  15.   public void insert(T object) {
  16.     repositories.get(object.getClass()).save(object);
  17.   }
  19. }
英文:

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

I think you can use Genarics over here.

  1. public class RepositoryService &lt;R extends JpaRepository&lt;T, Long&gt;, T&gt; {
  3.   @Autowired R repository;
  5.   public void insert(T object) {
  6.     repository.save(object);
  7.   }
  9. }

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

  1. public abstract class RepositoryService &lt;T&gt;{
  3.   abstract Class getRepositoryClass();
  5.   Map&lt;Class, GenericRepository&gt; repositories;
  7.   @Autowired
  8.   List&lt;GenericRepository&gt; repositoriesList;
  10.   @PostConstruct
  11.   public void setupMap() {
  12.     // Convert List into Map, with the class of Objest to be saved.
  13.   }
  15.   public void insert(T object) {
  16.     repositories.get(object.getClass()).save(object);
  17.   }
  19. }

huangapple
  • 本文由 发表于 2020年8月10日 11:57:53
  • 转载请务必保留本文链接：https://go.coder-hub.com/63333956.html
  • inheritance
  • java
  • spring
  • spring-data-jpa
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