将数据成员声明为休眠中的主键

Question

I have 2 Entity classes User and Address

@Entity
class User
{
    int id;
    String name;
}

@Entity
class Vehicle
{
    @OneToOne
    User user;
    String vehName; 
}

I want to declare "user" data member in Vehicle class as primary key..can anyone tell me the solution?

Answer 1

As explained in the documentation :

Finally, you can ask Hibernate to copy the identifier from another associated entity. In the Hibernate jargon, it is known as a foreign generator but the JPA mapping reads better and is encouraged.

@Entity
class MedicalHistory implements Serializable {
  @Id @OneToOne
  @JoinColumn(name = "person_id")
  Person patient;
}

@Entity
public class Person implements Serializable {
  @Id @GeneratedValue Integer id;
}

Or alternatively

@Entity
class MedicalHistory implements Serializable {
  @Id Integer id;

  @MapsId @OneToOne
  @JoinColumn(name = "patient_id")
  Person patient;
}

@Entity
class Person {
  @Id @GeneratedValue Integer id;
}