Examples of com.db4o.ObjectContainer.query()

com.db4o.ObjectContainer.query()
creates a new S.O.D.A. {@link Query Query}.

Use {@link #queryByExample(Object)} for simple Query-By-Example.

{@link #query(Predicate) Native queries } are the recommended main db4o queryinterface.

@return a new Query object @throws DatabaseClosedException db4o database file was closed or failed to open.

        account.setName("simon");
        account.setPassword("somepass");
        Storage storage = this.controller.getStorage();
        storage.storeAccount(account);
        ObjectContainer container = getContainer();
        Query q = container.query();
        q.constrain(GDataAccount.class);
        q.descend("name").constrain(account.getName());
        ObjectSet set = q.execute();
        assertEquals(1, set.size());
        assertEquals(account.getPassword(), ((GDataAccount) set.next())

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        } catch (Exception e) {
            //
        }
        storage.storeAccount(account);
        ObjectContainer container = getContainer();
        Query q = container.query();
        q.constrain(GDataAccount.class);
        q.descend("name").constrain(account.getName());
        ObjectSet set = q.execute();
        assertEquals(1, set.size());
        assertEquals(account.getPassword(), ((GDataAccount) set.next())

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        account.setName("simon");
        account.setPassword("newPass");
        storage.updateAccount(account);
        container.close();
        container = getContainer();
        q = container.query();
        q.constrain(GDataAccount.class);
        q.descend("name").constrain(account.getName());
        set = q.execute();
        assertEquals(1, set.size());
        assertEquals(account.getPassword(), ((GDataAccount) set.next())

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        account.setName("simon");
        account.setPassword("somepass");
        Storage storage = this.controller.getStorage();
        storage.storeAccount(account);
        ObjectContainer container = getContainer();
        Query q = container.query();
        q.constrain(GDataAccount.class);
        q.descend("name").constrain(account.getName());
        ObjectSet set = q.execute();
        assertEquals(1, set.size());

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        assertEquals(1, set.size());


        storage.deleteAccount(account.getName());
        container.close();
        container = getContainer();
        q = container.query();
        q.constrain(GDataAccount.class);
        q.descend("name").constrain(account.getName());
        set = q.execute();
        assertEquals(0, set.size());
        try {

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        container.commit();
        container.close();
        storage.storeFeed(feed, ACCOUNTNAME);


        container = getContainer();
        Query query = container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(FEEDID);
        ObjectSet set = query.execute();
        assertEquals(1, set.size());

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        feed.setServiceConfig(conf);
        storage.storeFeed(feed, ACCOUNTNAME);


        storage.deleteFeed(FEEDID);
        container = getContainer();
        Query query = container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(FEEDID);
        ObjectSet set = query.execute();
        assertEquals(0, set.size());

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    int totalProgressIncremented = 0;
    progressMonitor.beginTask(Messages.Migration3To4_MIGRATING_DATA, totalProgress);


    ObjectContainer oc = Db4o.openFile(configFactory.createConfiguration(), dbFileName);


    List<NewsBin> newsBins = oc.query(NewsBin.class);


    for (INewsBin newsBin : newsBins) {
      oc.activate(newsBin, Integer.MAX_VALUE);
      for (NewsReference newsRef : newsBin.getNewsRefs()) {
        Query query = oc.query();

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    List<NewsBin> newsBins = oc.query(NewsBin.class);


    for (INewsBin newsBin : newsBins) {
      oc.activate(newsBin, Integer.MAX_VALUE);
      for (NewsReference newsRef : newsBin.getNewsRefs()) {
        Query query = oc.query();
        query.constrain(News.class);
        query.descend("fId").constrain(newsRef.getId()); //$NON-NLS-1$
        News news = (News) query.execute().iterator().next();
        oc.activate(news, Integer.MAX_VALUE);
        String parentIdFieldName = "fParentId"; //$NON-NLS-1$

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    try {


      /* Assert Number of Entities */
      List<IEntity> entities = db.query(IEntity.class);
      assertEquals(entities.size(), defragmentedDb.query(IEntity.class).size());
      for (IEntity entity : entities) {
        Query query = defragmentedDb.query();
        query.constrain(entity.getClass());
        query.descend("fId").constrain(Long.valueOf(entity.getId())); //$NON-NLS-1$

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