Examples of com.db4o.ObjectSet

com.db4o.ObjectSet
An ObjectSet is a representation for a set of objects returned by a query.

ObjectSet extends the system collection interfaces java.util.List/System.Collections.IList where they are available. It is recommended, never to reference ObjectSet directly in code but to use List / IList instead.

Note that the underlying {@link ObjectContainer ObjectContainer} of an ObjectSetneeds to remain open as long as an ObjectSet is used. This is necessary for lazy instantiation. The objects in an ObjectSet are only instantiated when they are actually being used by the application. @see ExtObjectSet for extended functionality.

        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());


        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 {
            storage.deleteAccount("notstored");
            fail("account not stored");
        } catch (Exception e) {
            //

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        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());


        assertEquals(feed.getId(), ((ServerBaseFeed) set.next()).getId());
        container.close();


    }

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        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());


        query = getContainer().query();
        query.constrain(BaseFeed.class);
        query.descend("id").constrain(FEEDID);
        set = query.execute();
        assertEquals(0, set.size());
        container.close();
    }

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  /**
   * Empties the database.
   */
  public void empty() {
    ObjectSet result = db.get(new Object());
    while (result.hasNext()) {
      db.delete(result.next());
    }
  }

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