hibermate一对一关联

在hibernate.cfg.xml配置<mapping class="oneToOne.IDCard" />,以及实体类的get和set方法省略了.

User类

@Entity
@Table(name = "t_user")
public class User {
    @Id
    @GenericGenerator(name = "myuuid", strategy = "uuid")
    @GeneratedValue(generator = "myuuid")
    private String id;
    private String name;
    @OneToOne(targetEntity = IDCard.class, mappedBy = "user")
    private IDCard idCard;

IDCard类

@Entity
@Table(name = "t_idcard")
public class IDCard {
    @Id
    @GenericGenerator(name = "myuuid", strategy = "uuid")
    @GeneratedValue(generator = "myuuid")
    private String id;
    private String cardNum;
    @OneToOne(targetEntity = User.class)
    @JoinColumn(name = "c_user_id")
    @Cascade(CascadeType.SAVE_UPDATE)
    private User user;

Test类

@Test
    public void test1() {
        Session session = HibernateUtils.openSession();
        session.beginTransaction();
        // 1.创建一个用户
        User user = new User();
        user.setName("张三");
        // 2.创建身份证号
        IDCard card = new IDCard();
        card.setCardNum("123321");
        // 3.身份证号关联人
        card.setUser(user);
        // 4.储存身份证号
        session.save(card);
        session.getTransaction();
        session.close();
    }