URG-updating a parent does not generate id for the new child

leela · **Joined:** Thu Oct 25, 2007 1:21 pm **Posts:** 29

Hi,

When i am trying to update a parent containing new child, hibernate is not generating an id for the new child.

Can anyone tell what this is happening? Thanks for any help.

Thanks

Cameron McKenzie · **Posted:** Wed Jun 11, 2008 9:53 am

You might want to look at the cascade type on each end of the relationship. Is this inheritance parent-child, or a one-to-many parent-child.

You may want to ensure that both sides of the relationship are being saved. Here's an example from a tutorial on mapping one to many relationships. The Team and Player scenario should be universally understandable:

http://jpa.ezhibernate.com/Javacode/learn.jsp?tutorial=18mappingonetomanyassociations

Code:

 public static void main(String args[]){
    HibernateUtil.recreateDatabase();
    Session session=HibernateUtil.beginTransaction();

    Team team = new Team();
    Player p1 = new Player();
    Player p2 = new Player();

    session.save(team);
    session.save(p1);
    session.save(p2);

    team.setName("Pickering Atoms");
    p1.setNickName("Lefty");
    p1.setTeam(team);
    p2.setNickName("Blinky");
    p2.setTeam(team);
    HibernateUtil.commitTransaction();
  }

http://jpa.ezhibernate.com/Javacode/learn.jsp?tutorial=18mappingonetomanyassociations

leela · **Joined:** Thu Oct 25, 2007 1:21 pm **Posts:** 29

thanks for your reply. appreciate it.

let me try this way.

thanks a lot.