Hibernate @OneToOne mappedBy

Question

我正面临以下问题:我有一个表A和B，其中有一个指向表A的外键。一个实体有以下字段: A：

public class A{

    @Column(name = "id_adres", nullable = false)
    private Long idAddress;
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name = "id_adres", nullable = false)
    private Long idAddress;

B实体有一个字段(以及其他字段)：

public class B{
    @Id
    @Column(name = "id")
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Long id;

    @Column(name = "id_adres", nullable = false)
    private Long idAddress;
    @Column(name = "id_adres", nullable = false)
    private Long idAddress;

如何将B类型的字段添加到A实体中？答：

@OneToOne(mappedBy = "idAddress")
private B b

此解决方案不起作用，A实体中的字段B b在查询语句后为空。

Answer 1

long并不是我使用long try的相同示例的原因：

public class UserToken {
    @OneToOne(targetEntity = User.class)
    @JoinColumn(nullable = false, name = "user_id")
    private long tokenId;

}

public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "user_id", unique = true, nullable = false)
    private long userId;

}