Java 从两个表创建一个引用表

我将我的站点转换为使用JavaEE和hibernate

我有三张桌子：

like
id | table | idElement | userId

movie
movie_id | title | duration

videoGame
game_id | title | nbPlayer

目前有2类：

@Entity
@Table(name="movie")
public class Movie {

    @Id
    @GeneratedValue
    @Column(name="movie_id")
    private Integer id;
    private String title;
    private int duration;

@Entity
@Table(name="videoGame")
public class Game {

    @Id
    @GeneratedValue
    @Column(name="game_id")
    private Integer id;
    private String title;
    private int nbPlayer;

我不知道如何使我的表“像”链接到两个表和正确的id之一

例如：

table like:
+---+-------+-----------+-------+
|id | table | idElement | userId|
|1  | movie |  1        | 1     |
|1  | game  |  5        | 3     |
+---+-------+-----------+-------+

---

非常感谢你的帮助

似乎没有直接的方法将表映射到hibernate（至少我不知道）

使用继承可以产生类似的效果

Movie

和

Game

可以是另一个类的子类（比如

Likable

）。这样，您就可以像下面这样使用

Likable

类：

 @Entity
 @Table(name="like")
 public class Like {

   @Id
   @GeneratedValue
   @Column(name="like_id")
   private Integer id;

   @ManyToOne
   @JoinColumn(name="likable_id", nullable=false)
   private Likable likable;

   @ManyToOne
   @JoinColumn(name="user_id", nullable=false)
   private User user;
}

@Entity  
@Table(name = "likable")  
@Inheritance(strategy=InheritanceType.JOINED)   
public class Likable {  

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

 }

Likable

类将如下所示：

 @Entity
 @Table(name="like")
 public class Like {

   @Id
   @GeneratedValue
   @Column(name="like_id")
   private Integer id;

   @ManyToOne
   @JoinColumn(name="likable_id", nullable=false)
   private Likable likable;

   @ManyToOne
   @JoinColumn(name="user_id", nullable=false)
   private User user;
}

@Entity  
@Table(name = "likable")  
@Inheritance(strategy=InheritanceType.JOINED)   
public class Likable {  

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

 }

电影

课程：

 @Entity
 @Table(name="movie")
 @PrimaryKeyJoinColumn(name="id")  
 public class Movie extends Likable {

     private String title;
    private int duration;
}

@Entity
@Table(name="videoGame")
@PrimaryKeyJoinColumn(name="id")
public class Game extends Likable {

   private String title;
   private int nbPlayer;
}

和

游戏

课程：

 @Entity
 @Table(name="movie")
 @PrimaryKeyJoinColumn(name="id")  
 public class Movie extends Likable {

     private String title;
    private int duration;
}

@Entity
@Table(name="videoGame")
@PrimaryKeyJoinColumn(name="id")
public class Game extends Likable {

   private String title;
   private int nbPlayer;
}