我试图学习Hibernate的这个简单的例子,但我对数据库中仍然为“空”的外键有这么麻烦。休眠不设置外键
@Entity
@Table(name = "tb1")
public class Track {
@Id
@GeneratedValue(strategy= GenerationType.IDENTITY)
@Column(name="id_tb1", unique= true)
private int id_tb1;
@Column(name = "title")
private String title;
@ManyToOne
@JoinColumn(name="id_tb2")
private tb2 cd;
这是第二类
@Entity
@Table(name = "tb2")
public class CD {
@Id
@GeneratedValue(strategy= GenerationType.IDENTITY)
@Column(name="id_tb2", unique = true)
private int id_tb2;
@Column(name="title")
private String title;
@OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL,mappedBy = "cd")
private List<tb1> tracks = new ArrayList<tb1>();
我保存这样的:
SessionFactory factory = new Configuration().configure("/resources/hibernate.cfg.xml").buildSessionFactory();
Session session1 = factory.openSession();
session1.beginTransaction();
session1.save(tb2);
session1.getTransaction().commit();
但当Isavethe id_tb2(在表TB1)未设置并保持为空。我错过了什么?
什么类型的列表是CD类中的曲目。 TB1?添加你的整个代码。 –
我假定它的私人列表
@RohitGaikwad是的! – untruste