protected static function _columnExists($sTable, $sColumn)
    {
        $oConfig = Registry::getConfig();
        $sDbName = $oConfig->getConfigParam('dbName');
        $sSql = 'SELECT 1
                    FROM information_schema.COLUMNS
                    WHERE
                        TABLE_SCHEMA = ?
                    AND TABLE_NAME = ?
                    AND COLUMN_NAME = ?';

        $oDb = DatabaseProvider::getDb();

        return (bool)$oDb->getOne($sSql, array($sDbName, $sTable, $sColumn));
    }