function __construct()
{
if (!class_exists("TActiveRecordManager", false)) {
throw new Exception("You need to enable the ActiveRecord module in your application configuration file.");
}
$ar_manager = TActiveRecordManager::getInstance();
$_conn = $ar_manager->getDbConnection();
$_conn->Active = true;
$this->_dbMetaData = TDbMetaData::getInstance($_conn);
}