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.


      /* Assert Preference */
      List<IPreference> preferences = db.query(IPreference.class);
      assertEquals(preferences.size(), defragmentedDb.query(IPreference.class).size());
      for (IPreference preference : preferences) {
        Query query = defragmentedDb.query();
        query.constrain(preference.getClass());
        query.descend("fId").constrain(Long.valueOf(preference.getId())); //$NON-NLS-1$


        List<IPreference> result = query.execute();
        assertEquals(1, result.size());

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          assertTrue(Arrays.equals(preference.getLongs(), otherPreference.getLongs()));
      }


      /* Assert Label */
      List<ILabel> labels = db.query(ILabel.class);
      assertEquals(labels.size(), defragmentedDb.query(ILabel.class).size());
      for (ILabel label : labels) {
        Query query = defragmentedDb.query();
        query.constrain(label.getClass());
        query.descend("fId").constrain(Long.valueOf(label.getId())); //$NON-NLS-1$

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      /* Assert Label */
      List<ILabel> labels = db.query(ILabel.class);
      assertEquals(labels.size(), defragmentedDb.query(ILabel.class).size());
      for (ILabel label : labels) {
        Query query = defragmentedDb.query();
        query.constrain(label.getClass());
        query.descend("fId").constrain(Long.valueOf(label.getId())); //$NON-NLS-1$


        List<INewsBin> result = query.execute();
        assertEquals(1, result.size());

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        assertEquals(1, result.size());
        assertTrue(((Label) label).isIdentical((ILabel) result.get(0)));
      }


      /* Assert Counter */
      assertEquals(db.query(Counter.class).get(0).getValue(), defragmentedDb.query(Counter.class).get(0).getValue());


      /* Assert Search Filter */
      List<ISearchFilter> filters = db.query(ISearchFilter.class);
      assertEquals(filters.size(), defragmentedDb.query(ISearchFilter.class).size());
      for (ISearchFilter filter : filters) {

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      /* Assert Counter */
      assertEquals(db.query(Counter.class).get(0).getValue(), defragmentedDb.query(Counter.class).get(0).getValue());


      /* Assert Search Filter */
      List<ISearchFilter> filters = db.query(ISearchFilter.class);
      assertEquals(filters.size(), defragmentedDb.query(ISearchFilter.class).size());
      for (ISearchFilter filter : filters) {
        Query query = defragmentedDb.query();
        query.constrain(filter.getClass());
        query.descend("fId").constrain(Long.valueOf(filter.getId())); //$NON-NLS-1$

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      /* Assert Search Filter */
      List<ISearchFilter> filters = db.query(ISearchFilter.class);
      assertEquals(filters.size(), defragmentedDb.query(ISearchFilter.class).size());
      for (ISearchFilter filter : filters) {
        Query query = defragmentedDb.query();
        query.constrain(filter.getClass());
        query.descend("fId").constrain(Long.valueOf(filter.getId())); //$NON-NLS-1$


        List<INewsBin> result = query.execute();
        assertEquals(1, result.size());

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        assertEquals(search.getSearchConditions().size(), otherSearch.getSearchConditions().size());
      }


      /* Assert Conditional Get */
      List<IConditionalGet> condGets = db.query(IConditionalGet.class);
      assertEquals(condGets.size(), defragmentedDb.query(IConditionalGet.class).size());
      for (IConditionalGet condGet : condGets) {
        Query query = defragmentedDb.query();
        query.constrain(condGet.getClass());
        query.descend("fLink").constrain(condGet.getLink().toString()); //$NON-NLS-1$

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      /* Assert Conditional Get */
      List<IConditionalGet> condGets = db.query(IConditionalGet.class);
      assertEquals(condGets.size(), defragmentedDb.query(IConditionalGet.class).size());
      for (IConditionalGet condGet : condGets) {
        Query query = defragmentedDb.query();
        query.constrain(condGet.getClass());
        query.descend("fLink").constrain(condGet.getLink().toString()); //$NON-NLS-1$


        List<IConditionalGet> result = query.execute();
        assertEquals(1, result.size());

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        assertEquals(condGet.getIfNoneMatch(), otherCondGet.getIfNoneMatch());
      }


      /* Assert EntityIdsByEventType */
      EntityIdsByEventType eventType = db.query(EntityIdsByEventType.class).get(0);
      EntityIdsByEventType otherEventType = defragmentedDb.query(EntityIdsByEventType.class).get(0);
      assertNotNull(eventType);
      assertNotNull(otherEventType);
      assertEquals(eventType, otherEventType);


      /* Assert NewsCounter / NewsCounterItem */

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      assertEquals(eventType, otherEventType);


      /* Assert NewsCounter / NewsCounterItem */
      NewsCounter newsCounter = db.query(NewsCounter.class).get(0);
      db.activate(newsCounter, Integer.MAX_VALUE);
      NewsCounter otherNewsCounter = defragmentedDb.query(NewsCounter.class).get(0);
      defragmentedDb.activate(otherNewsCounter, Integer.MAX_VALUE);
      assertNotNull(newsCounter);
      assertNotNull(otherNewsCounter);


      NewsCounterItem item = otherNewsCounter.get("http://www.rssowl.org");

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