休眠一對一映射，如何使兩個實體具有相同的主鍵

Question

我有兩個實體Resource（表資源）和VideoInfo（表video_info），從VideoInfo到Resource之間存在一對一的單向關係。以下代碼保存一對一關係，但保存的列resource.id不等於video_info.resourceId。註釋有什麼問題嗎？我知道我可以手動設置video_info.resourceId等於Resource.id，是否存在任何自動方式？

public static void main(String[] args) throws IOException { 
    Resource r=new Resource(); 
    r.setName("test"); 
    r.setPath("foo"); 
    r.setType("video"); 
    VideoInfo videoInfo=new VideoInfo(); 
    videoInfo.setResource(r); 
    Session session=Database.getSessionFactory().openSession(); 
    Transaction transaction=session.beginTransaction(); 
    try { 
     session.save(videoInfo); 
     transaction.commit(); 
    }catch (Exception e){ 
     transaction.rollback(); 
     return; 
    } 
    System.out.println(r.getId()); 
    System.out.println(videoInfo.getResourceId()); 
} 

輸出：

19 
0 

VideoInfo實體：

@Entity 
@Table(name = "video_info") 
public class VideoInfo { 
    @Id 
    private int resourceId; 
    @Column(name = "type") 
    private String type; 
    @Column(name = "time") 
    private Integer time; 
    @Column(name = "actors") 
    private String actors; 
    @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL) 
    @JoinColumn(name = "resourceId") 
    private Resource resource; 

    //getters and setters 

} 

資源實體：

@Entity 
@Table(name = "resource") 
public class Resource { 
    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    private int id; 
    @Column(name = "name") 
    private String name; 
    @Column(name = "path") 
    private String path; 
    @Column(name = "type") 
    private String type; 

    //getters and setters 
} 

Answer 1

我來回答我的問題：由於此鏈接@OneToOne With Shared Primary Key, Revisited說，我應該使用@MapsId註解。

@Entity 
@Table(name = "video_info") 
public class VideoInfo { 
    @Id 
    private int resourceId; 
    @Column(name = "type") 
    private String type; 
    @Column(name = "time") 
    private Integer time; 
    @Column(name = "actors") 
    private String actors; 
    @OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL) 
    @JoinColumn(name = "resourceId") 
    @MapsId 
    private Resource resource; 

    //getters and setters 
} 

Answer 2

您是否嘗試過@PrimaryKeyJoinColumn註解？

像這樣：

@OneToOne(fetch = FetchType.LAZY, cascade = CascadeType.ALL) 
@PrimaryKeyJoinColumn 
private Resource resource; 

關注這個link更好地理解