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.

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


    /* Copy all folder and mark properties to map */
    Map<Long, Map<String, ?>> idPropertiesMap = new HashMap<Long, Map<String, ?>>();
    for (Folder folder : oc.query(Folder.class)) {
      idPropertiesMap.put(folder.getId(), folder.getProperties());
    }


    for (Mark mark : oc.query(Mark.class)) {
      idPropertiesMap.put(mark.getId(), mark.getProperties());

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    Map<Long, Map<String, ?>> idPropertiesMap = new HashMap<Long, Map<String, ?>>();
    for (Folder folder : oc.query(Folder.class)) {
      idPropertiesMap.put(folder.getId(), folder.getProperties());
    }


    for (Mark mark : oc.query(Mark.class)) {
      idPropertiesMap.put(mark.getId(), mark.getProperties());
    }


    oc.close();

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    progressMonitor.worked(10);


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


    /* Preference */
    for (Preference pref : oc.query(Preference.class)) {
      oc.activate(pref, Integer.MAX_VALUE);
      oc.ext().set(convertPref(pref), Integer.MAX_VALUE);
      oc.delete(pref);
    }
    oc.commit();

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    }
    oc.commit();
    /* 20 */
    progressMonitor.worked(10);


    for (org.rssowl.core.persist.ISearchField searchField : oc.query(org.rssowl.core.internal.persist.SearchField.class))   {
      oc.activate(searchField, Integer.MAX_VALUE);
      String entityName = searchField.getEntityName();
      entityName = entityName.replace("core.model.types", "core.persist");
      MigrationHelper.setField(searchField, "fEntityName", entityName);
      oc.ext().set(searchField, Integer.MAX_VALUE);

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    }
    oc.commit();
    /* 30 */
    progressMonitor.worked(10);


    for (org.rssowl.core.persist.ISearchCondition searchCond : oc.query(org.rssowl.core.internal.persist.SearchCondition.class))   {
      oc.activate(searchCond, Integer.MAX_VALUE);
      int searchSpecOrdinal = searchCond.getSpecifier().ordinal();
      org.rssowl.core.persist.SearchSpecifier searchSpec = org.rssowl.core.persist.SearchSpecifier.values()[searchSpecOrdinal];
      MigrationHelper.setField(searchCond, "fSpecifier", searchSpec);
      oc.ext().set(searchCond, Integer.MAX_VALUE);

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    oc.commit();
    /* 40 */
    progressMonitor.worked(10);


    List<org.rssowl.core.persist.IFolder> folders = new ArrayList<org.rssowl.core.persist.IFolder>();
    for (org.rssowl.core.persist.IFolder folder : oc.query(org.rssowl.core.internal.persist.Folder.class))   {
      oc.activate(folder, Integer.MAX_VALUE);
      List<IFolderChild> children = new ArrayList<IFolderChild>(getFolderChildren(folder, "fFolders"));
      MigrationHelper.setField(folder, "fFolders", null);
      children.addAll(getFolderChildren(folder, "fMarks"));
      MigrationHelper.setField(folder, "fMarks", null);

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    for (org.rssowl.core.persist.IFolder folder : folders)   {
      oc.ext().set(folder, Integer.MAX_VALUE);
    }


    List<org.rssowl.core.persist.IMark> marks = new ArrayList<org.rssowl.core.persist.IMark>();
    for (org.rssowl.core.persist.IMark mark : oc.query(org.rssowl.core.internal.persist.Mark.class))   {
      oc.activate(mark, Integer.MAX_VALUE);
      org.rssowl.core.persist.IFolder parent = (org.rssowl.core.persist.IFolder) MigrationHelper.getFieldValue(mark, "fFolder");
      MigrationHelper.setField(mark, "fFolder", null);
      MigrationHelper.setField(mark, "fParent", parent);

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    oc.commit();
    /* 80 */
    progressMonitor.worked(40);


    for (Map.Entry<Long, Map<String, ?>> entry : idPropertiesMap.entrySet()) {
      Query query = oc.query();
      query.constrain(org.rssowl.core.internal.persist.AbstractEntity.class);
      query.descend("fId").constrain(entry.getKey()); //$NON-NLS-1$
      List<?> list = query.execute();
      org.rssowl.core.internal.persist.AbstractEntity entity = (org.rssowl.core.internal.persist.AbstractEntity) list.get(0);
      oc.activate(entity, Integer.MAX_VALUE);

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    config.objectClass(org.rssowl.core.internal.persist.News.class).objectField("fFeedLink").indexed(false); //$NON-NLS-1$
    config.objectClass(org.rssowl.core.internal.persist.News.class).objectField("fStateOrdinal").indexed(false); //$NON-NLS-1$
    oc = Db4o.openFile(config, dbFileName);


    /* Access classes with index */
    ObjectSet<org.rssowl.core.internal.persist.BookMark> markSet = oc.query(org.rssowl.core.internal.persist.BookMark.class);
    if (markSet.hasNext())
      markSet.next().getName();


    ObjectSet<org.rssowl.core.internal.persist.ConditionalGet> condGetSet = oc.query(org.rssowl.core.internal.persist.ConditionalGet.class);
    if (condGetSet.hasNext())

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