java - Spring 动态 JPA 存储库类型

Question

我需要从 XML 文件中填充大约 30 个表。为此，我想使用 JPA。

现在我有 30 个用 @Entity 注释的类，扫描实体和存储库的配置；

我还有:

@Repository
public interface MyRepository extends JpaRepository<MyEntity1, Long> {
}

和(一些 Controller ):

@Autowired
public MyRepository myRepository;
...
...
MyEntity1 entity = new MyEntity(...);
myRepository.save(entity);

它在一个 @Entity 上运行良好，但我应该为它定义 30 个存储库吗？

我以为我可以做这样的事情:

@Repository
public interface MyRepository<T> extends JpaRepository<T, Long> {
}

然后:

@Autowired
public MyRepository<MyEntity1> myRepository1;
@Autowired
public MyRepository<MyEntity2> myRepository2;

但是这给出了一个错误:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'myRepository1': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: Not a managed type: class java.lang.Object

Answer 1

试试这个方法:

所有实体的基类:

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class BaseEntity {

    @Id
    @GeneratedValue(strategy = GenerationType.TABLE)
    private Long id;
}

实体:

@Entity
public class Entity1 extends BaseEntity {

    private String name;
}

@Entity
public class Entity2 extends BaseEntity {

    private String name;
}

一个普通的 repo:

public interface BaseEntityRepo extends JpaRepository<BaseEntity, Long> {
}

用法:

public class BaseEntityRepoTest extends BaseTest {

    @Autowired
    private BaseEntityRepo repo;

    @Test
    public void baseEntityTest() throws Exception {

        BaseEntity entity1 = new Entity1("entity1");
        BaseEntity entity2 = new Entity2("entity2");

        repo.save(entity1);
        repo.save(entity2);

        List<BaseEntity> entities = repo.findAll();
        assertThat(entities).hasSize(2);

        entities.forEach(System.out::println);
    }
}