No, this will not happen. you can consider them separate primary keys.
Cheers
Ashwani
----- Original Message -----
From: "Xie, Jinpeng" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, June 21, 2002 9:16 PM
Subject: How does container passivate and activate Primary keys in Ent ity
Bean?
> The specification said 'it is possible that multiple entity beans use the
> same primary key class' on section 9.8.
>
> Now I have two entity bean that uses the same primary key as indicated by
> the following codes:
>
> -------------------------------------Primary Key
> object---------------------------------------
> public class IDPrimaryKey {
> private String id = null;
> private Integer versionNumber = null;
>
> public void setID(String newID) {
> this.id = newID;
> }
>
> public String getID() {
> return id;
> }
>
> public boolean equals(Object obj) {
> if (obj instanceof this) {
> MyPrimaryKey temp = (MyPrimaryKey)obj;
> return id.equals(temp.getID));
> }
>
> return false;
> }
>
>
> public int hashCode() {
> return id.hashCode();
> }
>
> public Integer getVersionNumber() {return versionNumber;}
> public void setVersionNumber(Integer newVersionNumber)
> {this.versionNumber = newVersionNumber;}
> }
>
> -------------------------------------------------Entity bean
> 1-----------------------------------------
>
> public class Employee implements EntityBean {
> private int versionNumberCount = 0;
> private IDPrimaryKey primaryKey = null;
> private EntityContext entityContext = null;
>
>
> public void ejbActivate() throws
> EJBException,java.rmi.RemoteException {
> primaryKey = (IDPrimaryKey)entityContext.getPrimaryKey();
> }
>
> public void ejbLoad() throws EJBException,java.rmi.RemoteException
{
>
> ...
> ... load data from database.........
>
> primaryKey.setVersionNumber(new
Integer(versionNumberCount++));
> }
> ................
>
> }
>
> -------------------------------------------------Entity Bean 2
> -------------------------------------
> public class Student implements EntityBean {
> private IDPrimaryKey primaryKey = null;
> private EntityContext entityContext = null;
>
>
> public void ejbActivate() throws
> EJBException,java.rmi.RemoteException {
> primaryKey = (IDPrimaryKey)entityContext.getPrimaryKey();
> }
>
> ................
> public void ejbLoad() throws EJBException,java.rmi.RemoteException {
> ...
> ... load data from database.........don't set version number
here
> }
> }
>
> --------------------------------------------------------------------------
--
> ------------------
>
> If I am debuging them, two IDPrimaryKey objects in above two entity beans
> have different memory
> address although memeber attribute 'id' is the same among two IDPrimaryKey
> objects and one in
> Employee entity bean with non-null versionNumber and one in Student entity
> bean with null versionNumber.
>
> What happens if the ejb container swap them out and bring them back
sometime
> later?
> Can Employee entity bean get IDPrimaryKey object with non-null
versionNumber
> and Student entity bean get IDPriamryKey object with null versionNumber?
>
>
> Jim
>
>
===========================================================================
> To unsubscribe, send email to [EMAIL PROTECTED] and include in the
body
> of the message "signoff EJB-INTEREST". For general help, send email to
> [EMAIL PROTECTED] and include in the body of the message "help".
>
===========================================================================
To unsubscribe, send email to [EMAIL PROTECTED] and include in the body
of the message "signoff EJB-INTEREST". For general help, send email to
[EMAIL PROTECTED] and include in the body of the message "help".
