Composite Key Auto Generate

Karteek.Chenna · **Joined:** Mon Oct 25, 2010 11:03 am **Posts:** 2

How does Hibernate deal Composite Key to auto generate the a column value. I have My entity as below. In the id variable, I need one of the value to be auto-generated. how do we auto generated key when dealing with composite primary key.

Code:

@Entity
@Table(name="co_dmd_adjt_id "
    ,schema="public"
)
public class CoDmdAdjtId implements java.io.Serializable {


     private CoDmdAdjtId id;
     private Character cdActn;
     private Date effDate;
     private Date expDate;

    @EmbeddedId
    @AttributeOverrides( {
        @AttributeOverride(name="idBsnUn", column=@Column(name="id_bsn_un", nullable=false, length=40) ),
        @AttributeOverride(name="idAdjtFct", column=@Column(name="id_adjt_fct", nullable=false) ) } )
    public CoDmdAdjtId getId() {
        return this.id;
    }

    public void setId(CoDmdAdjtId id) {
        this.id = id;
    }

Code:

@Embeddable
public class CoDmdAdjtId  implements java.io.Serializable {


     private String idBsnUn;
     private Integer idAdjtFct;

    public CoDmdAdjtId() {
    }

    @Column(name="id_bsn_un", nullable=false, length=40)
    public String getIdBsnUn() {
        return this.idBsnUn;
    }
    
    public void setIdBsnUn(String idBsnUn) {
        this.idBsnUn = idBsnUn;
    }

    @Column(name="id_adjt_fct", nullable=false)
    @GeneratedValue(strategy=GenerationType.AUTO)
    public Integer getIdAdjtFct() {
        return this.idAdjtFct;
    }
    
    public void setIdAdjtFct(Integer idAdjtFct) {
        this.idAdjtFct = idAdjtFct;
    }
}

kurtgeiger · **Joined:** Wed Jul 11, 2012 3:03 am **Posts:** 1

Hibernate supports the automatic generation of some of the identifier properties. Simply use the @GeneratedValue annotation on one or several id properties.

...

You can also generate properties inside an @EmbeddedId class.

Karteek.Chenna · **Joined:** Mon Oct 25, 2010 11:03 am **Posts:** 2

Kurt,
I did try making one the column my @Embeddable class with @GeneratedValue anototaion but it didn't work. Any help would be appreciated