休眠@OneToOne mappedBy

Question

我面临以下问题：我有一个 table A 和 B，外键指向 table A。实体具有以下字段：答：

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

这个方案不行，查询语句后A实体中的字段B b为NULL

Answer 1

长并不是我有相同示例的原因，长尝试是这样的：

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;

}

休眠@OneToOne mappedBy

Hibernate @OneToOne mappedBy

hibernate

one-to-one

mappedby