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一對一的單向關系。 以下代碼保存了一對一關系，但保存的列resource.id不等於video_info.resourceId。 注釋有什么問題嗎？ 我知道我可以手動將video_info.resourceId設置為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

您是否嘗試過@PrimaryKeyJoinColumn注解？

像這樣：

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

點擊此鏈接可更好地了解

Answer 2

讓我回答我的問題：再次提到帶有共享主鍵的@OneToOne鏈接時，我應該使用@MapsId注釋。

@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
}