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.

    ObjectContainer db = Db4o.openFile(DBManager.createConfiguration(false), originDbFile.getAbsolutePath());
    ObjectContainer defragmentedDb = Db4o.openFile(DBManager.createConfiguration(false), defragmentedDbFile.getAbsolutePath());


    /* 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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    /* 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())); //$NON-NLS-1$


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

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        assertTrue(((SearchMark) entity).isIdentical((SearchMark) result.get(0)));
    }


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

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


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

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      assertEquals(news.getTitle(), result.get(0).getTitle());
    }


    /* Assert Description */
    List<Description> descriptions = db.query(Description.class);
    assertEquals(descriptions.size(), defragmentedDb.query(Description.class).size());
    for (Description description : descriptions) {
      Query query = defragmentedDb.query();
      query.constrain(description.getClass());
      query.descend("fNewsId").constrain(Long.valueOf(description.getNews().getId())); //$NON-NLS-1$

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    /* Assert Description */
    List<Description> descriptions = db.query(Description.class);
    assertEquals(descriptions.size(), defragmentedDb.query(Description.class).size());
    for (Description description : descriptions) {
      Query query = defragmentedDb.query();
      query.constrain(description.getClass());
      query.descend("fNewsId").constrain(Long.valueOf(description.getNews().getId())); //$NON-NLS-1$


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

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      assertEquals(description.getValue(), result.get(0).getValue());
    }


    /* Assert News Bins */
    List<INewsBin> newsBins = db.query(INewsBin.class);
    assertEquals(newsBins.size(), defragmentedDb.query(INewsBin.class).size());
    for (INewsBin newsBin : newsBins) {
      Query query = defragmentedDb.query();
      query.constrain(newsBin.getClass());
      query.descend("fId").constrain(Long.valueOf(newsBin.getId())); //$NON-NLS-1$

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    /* Assert News Bins */
    List<INewsBin> newsBins = db.query(INewsBin.class);
    assertEquals(newsBins.size(), defragmentedDb.query(INewsBin.class).size());
    for (INewsBin newsBin : newsBins) {
      Query query = defragmentedDb.query();
      query.constrain(newsBin.getClass());
      query.descend("fId").constrain(Long.valueOf(newsBin.getId())); //$NON-NLS-1$


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

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      assertEquals(newsBin.getNews(), result.get(0).getNews());
    }


    /* Assert Folders, Bookmarks and Searchmarks */
    List<IFolder> folders = db.query(IFolder.class);
    assertEquals(folders.size(), defragmentedDb.query(IFolder.class).size());
    for (IFolder folder : folders) {
      Query query = defragmentedDb.query();
      query.constrain(folder.getClass());
      query.descend("fId").constrain(Long.valueOf(folder.getId())); //$NON-NLS-1$

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    /* Assert Folders, Bookmarks and Searchmarks */
    List<IFolder> folders = db.query(IFolder.class);
    assertEquals(folders.size(), defragmentedDb.query(IFolder.class).size());
    for (IFolder folder : folders) {
      Query query = defragmentedDb.query();
      query.constrain(folder.getClass());
      query.descend("fId").constrain(Long.valueOf(folder.getId())); //$NON-NLS-1$


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

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