JavaHibernate：如何使用第三个表将属性与条件连接起来

Question

我有以下表格

Object1
-------
id
...

Object2
-------
id
...

AttributeValue      
--------------      
id                  
attribute_id        
object_id  
value         

Attribute    
---------    
id           
name         
type         

。。。和实体类

@Entity
@Table(name = "Attribute")
public class Attribute {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;

    @Column(name = "name")
    private String name;

    @Column(name = "type")
    private String type;
}


@Entity
@Table(name = "AttributeValue")
public class AttributeValue {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;

    @Column(name = "attribute_id")
    private Long attributeId;

    @Column(name = "object_id")
    private Long objectId;

    @Column(name = "value")
    private String value;
}


@Entity
@Table(name = "Object1")
public class Object1 {

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

    // ...    

    // how to annotate to get all matching attribute values?
    private Set<AttributeValue> values;
}

我希望hibernate用所有具有相应的object_id和属性类型object1的AttributeValue来填充values实例变量

如果只是关于object_id的标准，我会写例如

@JoinColumn(insertable = false, updatable = false, name = "object_id")
private Set<AttributeValue> values;

但在这种情况下，它也会用类型object2等填充值

所以我的问题是：这个语义在Hibernate中可以表达吗？如果可以，如何表达

编辑：我想强调的是，目标是使多个对象（这里Object1，Object2，ObjectN）没有公共层次结构，但都具有属性的特性。所有对象的属性都将驻留在one表中，通过某种鉴别器进行区分（这里示例为^{）

Answer 1

我认为目标必须是：

@Entity
@Table(name = "AttributeValue")
public class AttributeValue {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Long id;

    @Column(name = "attribute_id")
    private Long attributeId;

    @ManyToOne
    @JoinColumn(name="object_id", nullable=false)
    private Object1 object1;

    @Column(name = "value")
    private String value;
}


@Entity
@Table(name = "Object1")
public class Object1 {

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

    @OneToMany(mappedBy="object1")
    private Set<AttributeValue> values;
}

Hibernate将在AttributeValue表上只生成object_id列