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 clearDynamicElements(retval.getEntry());
    }


    @SuppressWarnings("unchecked")
    private DB4oEntry getInternalEntry(String id) throws StorageException {
        Query query = this.container.query();
        query.constrain(DB4oEntry.class);
        query.descend("entry").descend("id").constrain(id).equal();
        ObjectSet<DB4oEntry> resultSet = query.execute();
        if (resultSet.size() > 1)
            throw new StorageException(
                    "Entry query returned not a unique result");
        if (resultSet.hasNext())
            return resultSet.next();

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            throw new StorageException("Can not store feed -- id is null");
        if(feed.getServiceType() == null)
            throw new StorageException("Can not store feed -- service type is null");
        if(accountname == null)
            throw new StorageException("Account name is null");
        Query query = this.container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(feed.getId()).equal();
        ObjectSet set = query.execute();
        if (set.hasNext())
            throw new StorageException("feed with feedID " + feed.getId()
                    + " is already stored");
        GDataAccount account = getAccount(accountname);
        refreshPersistentObject(account);

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     * @see org.apache.lucene.gdata.storage.Storage#deleteFeed(java.lang.String)
     */
    public void deleteFeed(String feedId) throws StorageException {
        if (feedId == null)
            throw new StorageException("can not delete feed -- feed id is null");
        Query query = this.container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(feedId).equal();
        ObjectSet set = query.execute();
        if (set.size() > 1)
            throw new StorageException(
                    "Feed query returned not a unique result");
        if (set.size() == 0)
            throw new StorageException("no feed with feedID: " + feedId

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        if(feed.getServiceType() == null)
            throw new StorageException("Can not update feed -- service type is null");
        if(accountname == null)
            throw new StorageException("Account name is null");
        GDataAccount account = getAccount(accountname);
        Query query = this.container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(feed.getId());
        ObjectSet<ServerBaseFeed> set=  query.execute();
        if (set.size() > 1)
            throw new StorageException("Query for feed id " + feed.getId()
                    + " returns more than one result");
        if (set.size() < 1)
            throw new StorageException("can not find feed for given feed id -- "

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    public String getServiceForFeed(final String feedId) throws StorageException {
        if(feedId == null)
            throw new StorageException("can not get Service for feed -- feed id is null");
        if(LOG.isInfoEnabled())
            LOG.info("Retrieving Service for feed -- feed id: "+feedId);
        Query query = this.container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(feedId);
        ObjectSet<ServerBaseFeed> feed =  query.execute();
        if (feed.size() > 1)
            throw new StorageException("Query for feed id " + feedId
                    + " returns more than one result");
        if (feed.size() < 1)
            throw new StorageException("can not find feed for given feed id -- "

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        if (accountName == null)
            throw new StorageException(
                    "Can not get account -- account name is null");
        if (LOG.isInfoEnabled())
            LOG.info("Retrieving account for account name: " + accountName);
        Query query = this.container.query();
        query.constrain(GDataAccount.class);
        query.descend("name").constrain(accountName).equal();
        ObjectSet set = query.execute();
        if (set.size() > 1)
            throw new StorageException(
                    "Account query returned not a unique result -- account name: "
                            + accountName);
        if (!set.hasNext())

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        return new Long(getInternalEntry(entryId).getUpdateTime());
    }
    
    @SuppressWarnings("unchecked")
    private ServerBaseFeed getServerBaseFeed(String feedId)throws StorageException{
        Query query = this.container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(feedId);
        ObjectSet<ServerBaseFeed> feed =  query.execute();
        if (feed.size() > 1)
            throw new StorageException("Query for feed id " + feedId
                    + " returns more than one result");
        if (feed.size() < 1)
            throw new StorageException("can not find feed for given feed id -- "

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    }


    }
    
  protected final DownloadedMessageLink getDownloadedMessageLink(Message message) throws NoSuchMessageException {
      Query q = mDB.query();
      q.constrain(DownloadedMessageLink.class);
      q.descend("mMessage").constrain(message).identity();
      q.descend("mBoard").constrain(this).identity();
      ObjectSet<DownloadedMessageLink> messageLinks = new Persistent.InitializingObjectSet<Board.DownloadedMessageLink>(mFreetalk, q);
      
      switch(messageLinks.size()) {
        case 0: throw new NoSuchMessageException(message.getID());
        case 1: return messageLinks.next();

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    storeWithoutCommit();
    return result;
    }
    
    protected final ObjectSet<DownloadedMessageLink> getDownloadedMessagesAfterIndex(int index) {
        Query q = mDB.query();
        q.constrain(DownloadedMessageLink.class);
        q.descend("mBoard").constrain(this).identity();
        q.descend("mIndex").constrain(index).greater();
        return new Persistent.InitializingObjectSet<DownloadedMessageLink>(mFreetalk, q.execute());
    }

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        q.descend("mIndex").constrain(index).greater();
        return new Persistent.InitializingObjectSet<DownloadedMessageLink>(mFreetalk, q.execute());
    }
    
    private final DownloadedMessageLink getDownloadedMessageByIndex(int index) throws NoSuchMessageException {
        final Query q = mDB.query();
        q.constrain(DownloadedMessageLink.class);
        q.descend("mBoard").constrain(this).identity();
        q.descend("mIndex").constrain(index);
      final ObjectSet<DownloadedMessageLink> messageLinks = new Persistent.InitializingObjectSet<Board.DownloadedMessageLink>(mFreetalk, q);
      
      switch(messageLinks.size()) {
        case 0: throw new NoSuchMessageException("index: " + index);
        case 1: return messageLinks.next();

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