Examples of com.db4o.query.Query.constrain()

com.db4o.query.Query.constrain()
adds a constraint to this node.

If the constraint contains attributes that are not yet present in the query graph, the query graph is extended accordingly.

Special behaviour for:
- class {@link Class}: confine the result to objects of one class or to objects implementing an interface.
- interface {@link Evaluation}: run evaluation callbacks against all candidates.
@param constraint the constraint to be added to this Query. @return {@link Constraint} a new {@link Constraint} for thisquery node or null for objects implementing the {@link Evaluation} interface.

    return query.execute();
  }


  static boolean feedHasNewsWithCopies(ObjectContainer db, FeedLinkReference feedRef) {
    Query query = db.query();
    query.constrain(News.class);
    query.descend("fFeedLink").constrain(feedRef.getLink().toString()); //$NON-NLS-1$
    query.descend("fParentId").constrain(0).not(); //$NON-NLS-1$
    return !query.execute().isEmpty();
  }

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        for (NewsReference newsRef : newsBin.getNewsRefs()) {
          if (isCanceled(monitor, sourceDb, destinationDb))
            return;


          Query query = sourceDb.query();
          query.constrain(News.class);
          query.descend("fId").constrain(newsRef.getId()); //$NON-NLS-1$
          Iterator<?> newsIt = query.execute().iterator();
          if (!newsIt.hasNext()) {
            Activator.getDefault().logError("NewsBin " + newsBin + " has reference to news with id: " + newsRef.getId() + ", but that news does not exist.", null); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
            staleNewsRefs.add(newsRef);

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    return entities.contains(entity);
  }


  private void deleteFeedIfNecessary(IBookMark mark) {
    Query query = fDb.query();
    query.constrain(Feed.class);
    query.descend("fLinkText").constrain(mark.getFeedLinkReference().getLink().toString()); //$NON-NLS-1$
    @SuppressWarnings("unchecked")
    List<IFeed> feeds = query.execute();
    for (IFeed feed : feeds) {
      FeedLinkReference feedRef = new FeedLinkReference(feed.getLink());

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  }
  
  public List<FCPClient> findNonGlobalClients(NodeClientCore core, ObjectContainer container) {
      ArrayList<FCPClient> results = new ArrayList<FCPClient>();
    Query query = container.query();
    query.constrain(FCPClient.class);
    ObjectSet<FCPClient> set = query.execute();
    while(true) {
        try {
            if(set.hasNext()) {
                FCPClient client = set.next();

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    System.out.println("Stored " + pilot2);
  }


  public static void retrieveAllPilots(ObjectContainer db) {
    Query query = db.query();
    query.constrain(Pilot.class);
    ObjectSet result = query.execute();
    listResult(result);
  }


  public static void retrievePilotByName(ObjectContainer db) {

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    listResult(result);
  }


  public static void retrievePilotByName(ObjectContainer db) {
    Query query = db.query();
    query.constrain(Pilot.class);
    query.descend("name").constrain("Michael Schumacher");
    ObjectSet result = query.execute();
    listResult(result);
  }

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    listResult(result);
  }


  public static void retrievePilotByExactPoints(ObjectContainer db) {
    Query query = db.query();
    query.constrain(Pilot.class);
    query.descend("points").constrain(new Integer(100));
    ObjectSet result = query.execute();
    listResult(result);
  }

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    listResult(result);
  }


  public static void retrieveByNegation(ObjectContainer db) {
    Query query = db.query();
    query.constrain(Pilot.class);
    query.descend("name").constrain("Michael Schumacher").not();
    ObjectSet result = query.execute();
    listResult(result);
  }

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    listResult(result);
  }


  public static void retrieveByConjunction(ObjectContainer db) {
    Query query = db.query();
    query.constrain(Pilot.class);
    Constraint constr = query.descend("name").constrain("Michael Schumacher");
    query.descend("points").constrain(new Integer(99)).and(constr);
    ObjectSet result = query.execute();
    listResult(result);
  }

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    getDb4oTemplate().set(unit);
  }
  
  public List getAllRecipes() {
    Query allRecipes = getDb4oTemplate().query();
    allRecipes.constrain(Recipe.class);
    return allRecipes.execute();
  }


  public void saveRecipe(Recipe r) {
    getDb4oTemplate().set(r);

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