TDbCommand class file

• version: $Id: TDbCommand.php 1599 2007-01-06 03:36:40Z wei $
• license: http://www.pradosoft.com/license/
• copyright: Copyright © 2006 PradoSoft
• link: http://www.pradosoft.com/
• author: Qiang Xue <qiang.xue@gmail.com>