Java hibernate/jpa如何创建与自身相关的动态泛型实体

Question

我想用JPA/hibernate创建动态和通用的超类,它将扩展为每个分层结构化模型,如:角色,页面,目录,部门,权限,树.我想使用递归和java反射创建这个对象动态树

它应该是这样的:

该实体应该引用自身实体.

我希望它是完全抽象的,没有数据库表.只有extendet enities应该有db.

我试图实现这个目标.但失败了这么久.这是关于它的帖子

我考虑解决方案:

• @Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
• @Any和@AnyMetaDef映射
• @MappedSuperclass
• @Embeddable和@Embedded

我希望有人会提出一些建议.

Answer 1

我想出了以下设计。您还可以在GitHub上查看：

@MappedSuperclass
public abstract class GenericHierarchicalDictionary {

    public abstract GenericHierarchicalDictionary getParent();

    public abstract Set<? extends GenericHierarchicalDictionary> getChildren();

}

@Entity
@Table(name = "LocalFolder")
public class LocalFolder extends GenericHierarchicalDictionary {

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

    @ManyToOne
    private LocalFolder parent;

    @OneToMany(mappedBy = "parent")
    private Set<LocalFolder> children = new HashSet<LocalFolder>();

    @Override
    public LocalFolder getParent() {
        return parent;
    }

    @Override
    public Set<LocalFolder> getChildren() {
        return children;
    }

    public void addChild(LocalFolder localFolder) {
        localFolder.parent = this;
        children.add(localFolder);
    }
}

@Entity
@Table(name = "RemoteFolder")
public class RemoteFolder extends GenericHierarchicalDictionary {

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

    @ManyToOne
    private RemoteFolder parent;

    @OneToMany(mappedBy = "parent")
    private Set<RemoteFolder> children = new HashSet<RemoteFolder>();

    @Override
    public RemoteFolder getParent() {
        return parent;
    }

    @Override
    public Set<RemoteFolder> getChildren() {
        return children;
    }

    public void addChild(RemoteFolder localFolder) {
        localFolder.parent = this;
        children.add(localFolder);
    }
}

这是测试：

@Test
public void testTree() {
    LOGGER.debug("testAddWebResource");
    doInTransaction(new TransactionCallable<Void>() {
        @Override
        public Void execute(Session session) {
            LocalFolder rootLocalFolder = new LocalFolder();
            session.persist(rootLocalFolder);
            LocalFolder localFolder1 = new LocalFolder();
            rootLocalFolder.addChild(localFolder1);
            session.persist(localFolder1);
            LocalFolder localFolder11 = new LocalFolder();
            localFolder1.addChild(localFolder11);
            session.persist(localFolder11);

            RemoteFolder rootRemoteFolder = new RemoteFolder();
            session.persist(rootRemoteFolder);
            RemoteFolder remoteFolder1 = new RemoteFolder();
            rootRemoteFolder.addChild(remoteFolder1);
            session.persist(remoteFolder1);
            RemoteFolder remoteFolder11 = new RemoteFolder();
            remoteFolder1.addChild(remoteFolder11);
            session.persist(remoteFolder11);
            return null;
        }
    });
}