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

com.db4o.query.Query.descend()
returns a reference to a descendant node in the query graph.

If the node does not exist, it will be created.

All classes represented in the query node are tested, whether they contain a field with the specified field name. The descendant Query node will be created from all possible candidate classes. @param fieldName path to the descendant. @return descendant {@link Query} node


    }
    private boolean checkService(String feedId,String serviceId){
        Query query = this.container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(feedId).equal();
        query.descend("serviceType").constrain(serviceId).equal();
        return query.execute().size() == 1;
    }
    private ObjectSet getEnriesForFeedID(String feedId) {
        Query query = this.container.query();

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    }
    private boolean checkService(String feedId,String serviceId){
        Query query = this.container.query();
        query.constrain(ServerBaseFeed.class);
        query.descend("feed").descend("id").constrain(feedId).equal();
        query.descend("serviceType").constrain(serviceId).equal();
        return query.execute().size() == 1;
    }
    private ObjectSet getEnriesForFeedID(String feedId) {
        Query query = this.container.query();
        query.constrain(DB4oEntry.class);

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        return query.execute().size() == 1;
    }
    private ObjectSet getEnriesForFeedID(String feedId) {
        Query query = this.container.query();
        query.constrain(DB4oEntry.class);
        query.descend("feedId").constrain(feedId).equal();


        return query.execute();
    }


    /**

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    @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())

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            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);

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    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)

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        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)

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            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)

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                    "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);

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    @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)

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