Question

我有两张桌子，一对一的关系是黑白学生和地址表

Student
 student_id
 name

Address
  address_id
  student_id(foreign key to student_id  in student table)
  ...

这是相关实体部分

 @Entity
@Table(name = "STUDENT")
public class Student {

    @Id
    @GeneratedValue
    @Column(name = "STUDENT_ID")
    private long id;

    @OneToOne
    private Address address;

}


@Entity
@Table(name = "ADDRESS")
public class Address {

    @Id
    @GeneratedValue
    @Column(name = "ADDRESS_ID")
    private long id;

    private long student_id;

}

我想将外键（即student_id(foreign key to id in student table)保留在地址表下，如顶部的表结构所示，但希望在学生实体下保持private Address address的无方向关联。我不确定如何实现？

这是我尝试过的

@实体 @Table（名称=“学生”）公共班学生{

    @Id
    @GeneratedValue
    @Column(name = "STUDENT_ID")
    private long id;

    @OneToOne(mappedBy ="student_id")
    private Address address;

}


@Entity
@Table(name = "ADDRESS")
public class Address {

    @Id
    @GeneratedValue
    @Column(name = "ADDRESS_ID")
    private long id;

        @OneToOne
    @JoinColumn(name="student_id")
    private long student_id;

}

但是它给出了以下异常

@OneToOne or @ManyToOne on Address.student_id references an unknown entity: int
    at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(ToOneFkSecondPass.java:107)
    at org.hibernate.cfg.Configuration.processEndOfQueue(Configuration.java:1580)
    at

只要我与

建立双向关联，它就会起作用

private Student student_id而不是private long student_id

因此，当补充表（在本例中为地址表）中存在外键时，Hibernate强迫我进行双向关联

补充表中带有forein键的非定向一对一映射？

0 个答案: