如何使用Hibernate映射组合键，其中一个是外键

Question

I have a table who has a composite key(picture one) and one of them is a foreign key that refers another table (picture two)

How can I map this using hibernate???

The code below is the code I made. But its is not working. I think it is not the way to make this map.

The class CamposObrigatoriosID is the class that have

@Embeddable
public class CamposObrigatoriosID implements Serializable {

    private static final long serialVersionUID = 1L;


    @Column(name=“PERFIL_CMPOBR”)
    private Long perfil;    
    @Column(name=“ORDEM”)
    private Long ordem;
   @Column(name=“NOMETABELA”)
    private String nomeTabela;public Long getPerfil() {
        return perfil;
    }
...

    @Override
    public boolean equals(Object arg0) {
        if(arg0 instanceof CamposObrigatoriosID) {
            CamposObrigatoriosID that = (CamposObrigatoriosID) arg0;
            return this.perfil.equals(that.perfil) && this.ordem.equals(that.ordem) && this.nomeTabela.equals(that.nomeTabela);
        }
        return false;
    }
    @Override
    public int hashCode() {
        // TODO Auto-generated method stub
        return perfil.hashCode() + ordem.hashCode() + nomeTabela.hashCode();
    }

---

@Embeddable
public class CamposObrigatoriosID implements Serializable {

    private static final long serialVersionUID = 1L;


    @Column(name=“PERFIL_CMPOBR”)
    private Long perfil;    
    @Column(name=“ORDEM”)
    private Long ordem;
   @Column(name=“NOMETABELA”)
    private String nomeTabela;
    .....

---

@Entity
@Table(name=“USUARIO_PERFIL”)
public class UsuarioPerfil {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name=“CODIGO_USRPERFIL”)
    private Long id;

    @Column(name=“DESCRICAO_USRPERFIL”)
    private String desccricaoUsrPerfil;
    ...

---

Error: SQLState:42000, ISC error code:335544351

Answer 1

You should use a "derived identity". Although you do not include the code for CamposObrigatorios , I'm guessing it should look something like this:

@Entity
@Table(name = "CAMPOS_OBRIGATORIOS")
public class CamposObrigatorios {

    @EmbeddedId
    private CamposObrigatoriosID id;

    @ManyToOne
    @JoinColumn(name = "PERFIL_CMPOBR", referencedColumnName = "CODIGO_USRPERFIL")
    @MapsId("perfil") // maps 'perfil' attribute of embedded id
    private UsuarioPerfil usuarioPerfil;

    ...
}

Derived identities are discussed (with examples) in the JPA 2.1 spec in section 2.4.1.