[ojb-users] Storing mapped objects

[Govindarajan S (Gover) <gov...@az...>]

Hi,

I have a doubt regarding the storing of mapped objects. I tried to implement
the 1:1 relationship between the ProductGroup and Article. Whenever i was
setting the product instance in the article and when i persist the article
the ProductGroup is not persisted. Look at the code below,

	  Article article = new Article();
        article.setArticleName ("TestArticle");

        ProductGroup prodGrp = new ProductGroup();
        prodGrp.setProdGroupName("Group1");
        prodGrp.setDescription ("Testgroup");

        article.setProductGroup (prodGrp);
        try {
            broker.beginTransaction();
            broker.store(article);
            broker.commitTransaction();
        } catch (PersistenceBrokerException pExp) {
            System.out.println ("----- Error persisting Article -----");
            pExp.printStackTrace();
        } // end of try-catch

There are two tables namely the ProductGroup and Article. And the mapping is
all done as per the tutorial:3.

With the above code, i expected the ProductGroup to be saved as well. But i
had to persist the ProductGroup object ('prodGrp') separately. Is this a bug
or iam missing out a funda here?

This was the case with the 1:n mapping as well.

I retrieve the ProductGroup and add articles to it. But i persist the
ProductGroup hoping that the objects in the collection are also persisted.
But i dont find the articles persisted. Code is below,

  	  Criteria qryCriteria = new Criteria();
        qryCriteria.addEqualTo ("prodGroupName","Grocery");
        QueryByCriteria criterion = new QueryByCriteria (ProductGroup.class,
                                                     qryCriteria);
        ProductGroup prodGroup = (ProductGroup)broker.
            getObjectByQuery(criterion);
        Article art1 = new Article();
        art1.setArticleName ("Tea");
        art1.setProductGroup (prodGroup);

        Article art2 = new Article();
        art2.setArticleName ("Coffee");
        art2.setProductGroup (prodGroup);

        prodGroup.addArticle (art1);
        prodGroup.addArticle (art2);

        try {
            broker.beginTransaction();
            broker.store(prodGroup);
            broker.commitTransaction();
            System.out.println("--- Added the articles ---");

        } catch (PersistenceBrokerException pExp) {
            System.out.println("---- Error storing 1:n relation objs ---");
            pExp.printStackTrace();
        } // end of try-catch

any help in this regard would be greatly appreciated

regds
gover