如何在Hibernate中

Question

生成基本對象ID的名字我有我的所有實體基本對象：

@MappedSuperclass 
public class BaseObject { 

    @Id 
    @GeneratedValue 
    @Column(name = "entity_id") 
    private Long id; 

    /** 
    * 
    * @return true if the entity hasn't been persisted yet 
    */ 
    @Transient 
    public boolean isNew() { 
     return id == null; 
    } 

    public Long getId() { 
     return id; 
    } 

    public void setId(Long id) { 
     this.id = id; 
    } 
} 

的問題是，我需要ID unicate名。

像這樣：

user_id, car_id, cat_id 

我不知道，怎麼辦呢，你能幫幫我嗎？

它可能會覆蓋子類中的加號Column(name = "entity_id")？

public class User extends BaseObject 
public class Car extends BaseObject 
public class Cat extends BaseObject 

Answer 1

是的......你需要在每個子類上使用@AttributeOverride註解。例如，

@Entity 
@AttributeOverride(name="id", column=@Column(name="user_id")) 
public class User extends BaseObject { ... }