Doctrine\DBAL\Driver\OCI8\OCI8Statement::fetchColumn PHP Method

    public function fetchColumn($columnIndex = 0)
    {
        $row = oci_fetch_array($this->_sth, OCI_NUM | OCI_RETURN_NULLS | OCI_RETURN_LOBS);
        if (false === $row) {
            return false;
        }
        return isset($row[$columnIndex]) ? $row[$columnIndex] : null;
    }