code: protected ResultSet findNodeDataSize(String parentId) throws SQLException
     {
        if (findNodeDataSize == null)
        {
           findNodeDataSize = dbConnection.prepareStatement(FIND_NODE_DATA_SIZE);
        }
  
        findNodeDataSize.setString(1, parentId);
  
        return findNodeDataSize.executeQuery();
     }
docs: {@inheritDoc}