Jpa @onetomany 無法為反向生成外鍵

Question

電影 class 有他的會話列表，我想同時保留存儲在列表中的電影和他的會話。

所以這是我的代碼

public class Movie {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "movie_id")
    private int movieId;

    ...

    @OneToMany(mappedBy = "movie",cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    private List<Session> sessionList = new ArrayList<>();
}

public class Session {
 @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "session_id")
    private int sessionId;

    ...

    @ManyToOne
    @JoinColumn(name = "movie_id")
    private Movie movie;

}

測試代碼

public void testAddMovie(){
        Session session1 = new Session();
        session1.setDay("Monday");


        Movie movie = new Movie();
        movie.setTitle("hello");
        movie.getSessionList().add(session1);

        movieDao.addMovie(movie);
    }

sql 由 hibernate 生成

   insert 
   into
           movies
            (actors, .... ,title) 
        values
            (?, ?, ?, ?, ..., ?, ?, ?, ?)

  insert 
  into
            sessions
            (day, movie_id, time) 
        values
            (?, ?, ?)

Hibernate throws no exception, and both movie and session are successfully persisted but the foreign key 'movie_id' in the table session show always null.

所以有什么問題？ 當我只使用沒有@manytoone 的@onetomany 時，同樣的測試工作正常，外鍵被成功添加。

Answer 1

在 Session 實體中，將電影屬性更改為：

@ManyToOne
@JoinColumn(name = "movie_id", foreignKey = @ForeignKey(name = "fk_session_movie."))
private Movie movie;

Answer 2

事實證明，我錯過了部分代碼。 這是解釋原因的鏈接。 JPA @OneToMany：外鍵是 null