private function processPrimaryKeyResult($result)
    {
        $row_count = count($result);
        $this->updateLog("debug", "{$row_count} keys found");

        if ($row_count == 1) {
            $this->updateLog("debug", "Single key found; setting up key string");

            $keys = $result[0]['Column_name'];
        } else {
            $this->updateLog("debug", "No key or multiple keys found; returning false");

            $keys = false;
        }

        return $keys;
    }