Hibernate一对一映射

Question

我有一个类学生和类分数之间的一对一hibernate映射：

@Entity
@Table(name = "Users")
public class Student implements IUser {

    @Id
    @Column(name = "id")
    private int id;

    @Column(name = "name")
    private String name;

    @Column(name = "password")
    private String password;

    @OneToOne(fetch = FetchType.EAGER, mappedBy = "student")
    private Points points;

    @Column(name = "type")
    private int type = getType();
    //gets and sets...



@Entity
@Table(name = "Points")
public class Points {

    @GenericGenerator(name = "generator", strategy = "foreign", parameters = @Parameter(name = "property", value = "student"))
    @Id
    @GeneratedValue(generator = "generator")
    @Column(name = "id", unique = true, nullable = false)
    private int Id;


    @OneToOne
    @PrimaryKeyJoinColumn
    private Student student;
    //gets and sets

然后我执行以下操作：

Student student = new Student();
        student.setId(1);
        student.setName("Andrew");
        student.setPassword("Password");

        Points points = new Points();
        points.setPoints(0.99);

        student.setPoints(points);
        points.setStudent(student);

        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        session.save(student);
        session.getTransaction().commit();

Hibernate会将学生信息保存在表中，但不会保存相应的分数。这样可以吗？我应该单独保存分数吗？

- Andrey Yaskulsky

---

我认为你需要同时保存指针。 - Bhavik Ambani

Answer 1

@OneToOne(fetch = FetchType.EAGER, mappedBy = "student", cascade=CascadeType.PERSIST)
private Points points;

你能试试这个吗。

- Subin Sebastian

Answer 2

默认情况下，Hibernate 不会级联操作。在你的一对一关系上应该指定 CascadeType。

- Art Licis

Answer 3

如果您想保存学生和分数，您需要在注释中使用CascadeType，请参见此处的文档。

- Atropo