public function generatePlaceholder($value)/*# : string */
    {
        $key = '__PH_' . ++self::$positioned_count . '__';
        self::$positioned_params[$key] = $value;
        return $key;
    }
public function generatePlaceholder($value)/*# : string */
    {
        $key = '__PH_' . ++self::$positioned_count . '__';
        self::$positioned_params[$key] = $value;
        return $key;
    }
{@inheritDoc}