Examples of com.db4o.query.Query

com.db4o.query.Query
handle to a node in a S.O.D.A. query graph.

A node in the query graph can represent multiple classes, one class or an attribute of a class.

The graph is automatically extended with attributes of added constraints (see {@link #constrain(Object)}) and upon calls to {@link #descend(java.lang.String)} that request nodes that do not yet exist.

References to joined nodes in the query graph can be obtained by "walking" along the nodes of the graph with the method {@link #descend(String)}.

{@link #execute()}evaluates the entire graph against all persistent objects.

{@link #execute()} can be called from any {@link Query} nodeof the graph. It will return an {@link ObjectSet} filled withobjects of the class/classes that the node, it was called from, represents.

Note:
{@link Predicate Native queries} are the recommended main query interface of db4o.

    return new BookMarkEvent(entity, null, true);
  }


  public final Collection<IBookMark> loadAll(FeedLinkReference feedRef) {
    try {
      Query query = fDb.query();
      query.constrain(fEntityClass);
      query.descend("fFeedLink").constrain(feedRef.getLink().toString()); //$NON-NLS-1$
      List<IBookMark> marks = getList(query);
      activateAll(marks);
      return new ArrayList<IBookMark>(marks);
    } catch (Db4oException e) {
      throw new PersistenceException(e);

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    return entities.contains(entity);
  }


  private void deleteFeedIfNecessary(IBookMark mark) {
    Query query = fDb.query();
    query.constrain(Feed.class);
    query.descend("fId").constrain(mark.getFeedReference().getId()); //$NON-NLS-1$
    @SuppressWarnings("unchecked")
    ObjectSet<IFeed> feeds = query.execute();
    for (IFeed feed : feeds) {
      if(onlyBookMarkReference(feed)) {
        fDb.delete(feed);
      }
    }

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      }
    }
  }


  private boolean onlyBookMarkReference(IFeed feed) {
    Query query = fDb.query();
    query.constrain(BookMark.class);
    query.descend("fFeedId").constrain(feed.getId().longValue()); //$NON-NLS-1$
    
    @SuppressWarnings("unchecked")
    ObjectSet<IBookMark> marks = query.execute();


    if (marks.size() == 1) {
      return true;
    }
    return false;

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      throw new PersistenceException(e);
    }
  }


  private List<T> loadList(long id) throws Db4oException   {
    Query query = fDb.query();
    query.constrain(fEntityClass);
    query.descend("fId").constrain(Long.valueOf(id)); //$NON-NLS-1$
    return getList(query);
  }

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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);
      for (Map.Entry<String, ?> valueEntry : entry.getValue().entrySet()) {
        entity.setProperty(valueEntry.getKey(), valueEntry.getValue());
      }

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    savePreference(pref, valueBoolean);
  }
  
  @SuppressWarnings("unchecked")
  private Preference findPreference(String key)   {
    Query query = fDb.ext().query();
    query.constrain(Preference.class);
    query.descend("fKey").constrain(key); //$NON-NLS-1$
    ObjectSet<Preference> prefs = query.execute();
    if (prefs.hasNext()) {
      Preference pref = prefs.next();
      fDb.activate(pref, Integer.MAX_VALUE);
      return pref;
    }

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    return new IllegalStateException(message + ". This news in the db looks like: " //$NON-NLS-1$
        + dbNews.toLongString());
  }


  private List<INews> getNewsFromGuid(INews newsItem) {
    Query query = fDb.query();
    query.constrain(fEntityClass);
    query.descend("fGuidValue").constrain(newsItem.getGuid().getValue()); //$NON-NLS-1$
    return activateAll(getList(query));
  }

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    query.descend("fGuidValue").constrain(newsItem.getGuid().getValue()); //$NON-NLS-1$
    return activateAll(getList(query));
  }


  private List<INews> getNewsFromLink(INews newsItem) {
    Query query = fDb.query();
    query.constrain(fEntityClass);
    query.descend("fLinkText").constrain(newsItem.getLink().toString()); //$NON-NLS-1$
    return activateAll(getList(query));
  }

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    Assert.isNotNull(states, "states");
    if (states.isEmpty())
      return new ArrayList<INews>(0);


    try {
      Query query = fDb.query();
      query.constrain(News.class);
      query.descend("fFeedLink").constrain(feedRef.getLink().toString());
      if (!states.containsAll(EnumSet.allOf(INews.State.class))) {
        Constraint constraint = null;
        for (INews.State state : states) {
          if (constraint == null)
            constraint = query.descend("fStateOrdinal").constrain(state.ordinal());
          else
            constraint = query.descend("fStateOrdinal").constrain(state.ordinal()).or(constraint);
        }
      }


      Collection<INews> news = getList(query);
      activateAll(news);

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  }
  
  public final IConditionalGet loadConditionalGet(URL link) throws PersistenceException  {
    Assert.isNotNull(link, "link cannot be null"); //$NON-NLS-1$
    try {
      Query query = fDb.query();
      query.constrain(ConditionalGet.class);
      query.descend("fLink").constrain(link.toString()); //$NON-NLS-1$


      @SuppressWarnings("unchecked")
      ObjectSet<IConditionalGet> set = query.execute();
      for (IConditionalGet entity : set) {
        fDb.activate(entity, Integer.MAX_VALUE);
        return entity;
      }
    } catch (Db4oException e) {

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