doctrine / dbal

        if ($iterateRow) {

            foreach ($row as $k => $v) {

                if (($this->portability & Connection::PORTABILITY_EMPTY_TO_NULL) && $v === '') {

                    $row[$k] = null;

                } elseif (($this->portability & Connection::PORTABILITY_RTRIM) && is_string($v)) {

                    $row[$k] = rtrim($v);

                }

            }

        }

        $value = $this->stmt->fetchColumn($columnIndex);

        if ($this->portability & (Connection::PORTABILITY_EMPTY_TO_NULL|Connection::PORTABILITY_RTRIM)) {

            if (($this->portability & Connection::PORTABILITY_EMPTY_TO_NULL) && $value === '') {

                $value = null;

            } elseif (($this->portability & Connection::PORTABILITY_RTRIM) && is_string($value)) {

                $value = rtrim($value);

            }

        }

        return $value;