Hibernate创建OneToMany而不是OneToOne

Question

我不明白为什么这段代码会创建OneToMany而不是OneToOne有人可以告诉我我在哪里犯错了。我有2节课：

@Entity
@Table(name = "user")
public class User {

@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(unique=true)
@Id
private String login;
private String password;
private String firstName;
private String lastName;
private String city;
private int age;
private Sex sex ;
@OneToOne(fetch = FetchType.LAZY, mappedBy = "user", cascade = CascadeType.ALL)
//@JoinColumn(name= "user_details")
private UserProfile userProfile;

第二类：

@Entity
@Table(name = "user_profile")
public class UserProfile {

    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long Id;
    @Id
    private String user_login;
    private String user_interestings;
    @OneToOne//mappedBy= "userProfile")
    @MapsId
    private User user;

这里是图像，它在MySQLWOrkbench中的结尾enter image description here

感谢您的帮助。

Answer 1

将@JoinColumn与UserProfile中的外键一起用作数据库设计

public class UserProfile {
    ...
    @OneToOne
    @JoinColumn(name = "user_login")
    private User user;
}

并且您的主键对两个表都造成混淆。如果您需要两个表都使用相同的主键，则可以使用这种方式进行映射。这两个表的主键均为id。您不需要user_login表中的UserProfile列。

public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    ...
    @OneToOne(fetch = FetchType.LAZY, mappedBy = "user", cascade = CascadeType.ALL)
    private UserProfile userProfile;
}

public class UserProfile {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long Id;
    ...
    @OneToOne
    @MapsId
    private User user;
}