public function bindValues($command, $values)
	{
		if(($n=count($values))===0)
			return;
		if(isset($values[0])) // question mark placeholders
		{
			for($i=0;$i<$n;++$i)
				$command->bindValue($i+1,$values[$i]);
		}
		else // named placeholders
		{
			foreach($values as $name=>$value)
			{
				if($name[0]!==':')
					$name=':'.$name;
				$command->bindValue($name,$value);
			}
		}
	}