Examples of org.exolab.castor.jdo.Database.load()

org.exolab.castor.jdo.Database.load()
Load an object of the specified type and given identity. Once loaded the object is persistent. Calling this method with the same identity in the same transaction will return the same object. This method is equivalent to a query that returns a single object. If the identity spans on more than one field, all of the identity fields can be wrapped in a Complex object. @param type The object's type @param identity The object's identity @return The object instance. @throws ObjectNotFoundException No object of the given type andidentity was found in persistent storage @throws LockNotGrantedException Timeout or deadlock occuredattempting to acquire a lock on the object @throws TransactionNotInProgressException Method called whiletransaction is not in progress @throws PersistenceException An error reported by thepersistence engine

        Lazy1to1Parent parent = null;
        
        Database db = _category.getDatabase();
        
        db.begin();
        parent = (Lazy1to1Parent) db.load(Lazy1to1Parent.class, new Integer (1));
        db.commit();


        assertParent(parent, 1, "parent 1");
        Lazy1to1Child nature = parent.getChild();
        assertChild(nature, 1, "child 1");

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        Lazy1to1Parent parent = null;
        
        Database db = _category.getDatabase();
        
        db.begin();
        parent = (Lazy1to1Parent) db.load(Lazy1to1Parent.class, new Integer (1),
                                          AccessMode.ReadOnly);
        db.commit();


        assertParent(parent, 1, "parent 1");
        Lazy1to1Child nature = parent.getChild();

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        Lazy1to1Child nature = parent.getChild();
        assertChild(nature, 1, "child 1");


        // re-load to assert that nothing has changed
        db.begin();
        parent = (Lazy1to1Parent) db.load(Lazy1to1Parent.class, new Integer (1));
        db.commit();


        assertParent(parent, 1, "parent 1");
        assertChild(parent.getChild(), 1, "child 1");

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        Lazy1to1Parent parent = null;
        
        Database db = _category.getDatabase();
        
        db.begin();
        parent = (Lazy1to1Parent) db.load(Lazy1to1Parent.class, new Integer (1),
                                          AccessMode.ReadOnly);


        assertParent(parent, 1, "parent 1");
        Lazy1to1Child nature = parent.getChild();
        assertChild(nature, 1, "child 1");

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        db.commit();


        // re-load to assert that nothing has changed
        db.begin();
        parent = (Lazy1to1Parent) db.load(Lazy1to1Parent.class, new Integer (1));
        db.rollback();


        assertParent(parent, 1, "parent 1");
        assertChild(parent.getChild(), 1, "child 1");

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        Lazy1to1Parent parent = null;
        
        Database db = _category.getDatabase();
        
        db.begin();
        parent = (Lazy1to1Parent) db.load(Lazy1to1Parent.class, new Integer (1));
        assertParent(parent, 1, "parent 1");
        db.commit();
        
        db.close();
    }

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        Lazy1to1Parent parent = null;
        
        Database db = _category.getDatabase();
        
        db.begin();
        parent = (Lazy1to1Parent) db.load(Lazy1to1Parent.class, new Integer (1),
                                          AccessMode.ReadOnly);
        assertParent(parent, 1, "parent 1");
        db.commit();
        
        db.close();

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        Lazy1to1Parent parent = null;
        
        Database db = _category.getDatabase();
        
        db.begin();
        parent = (Lazy1to1Parent) db.load(Lazy1to1Parent.class, new Integer (1));
        assertParent(parent, 1, "parent 1");
        assertChild(parent.getChild(), 1, "child 1");
        db.commit();
        
        out.writeObject (parent);

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        Lazy1to1Parent parent = null;
        
        Database db = _category.getDatabase();
        
        db.begin();
        parent = (Lazy1to1Parent) db.load(Lazy1to1Parent.class, new Integer (1));
        assertParent (parent, 1, "parent 1");
        db.commit();
        
        out.writeObject (parent);
        out.close();

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        Lazy1to1Child child = null;


        Database db = _category.getDatabase();


        db.begin();
        child = (Lazy1to1Child) db.load(Lazy1to1Child.class, new Integer (2));
        assertChild(child, 2, "child 2");
        child.setDescription ("child 22");
        db.commit();


        db.begin();

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