Java jpa：@OneToOne

Question

I have a problem using JPA.

I want to the fatherId and father coexistence,When I query with join table.

@Entity
public class Son {

    @Id
    @Column(name = "id")
    private String id;

    
    
    @Column(name = "father_id")
    private String fatherId;


    @OneToOne
    @JoinColumn(name = "father_id")
    private Father father;
}

Answer 1

You have to set one to read-only.

For example:

@Column(name = "father_id", insertable = false, updatable = false)
private String fatherId;

@OneToOne
@JoinColumn(name = "father_id")
private Father father;

Otherwise Hibernate has two ways to write the foreign key.