public function getFieldData(VersionInfo $versionInfo)
    {
        $query = $this->connection->createQueryBuilder();
        $query->select('product_id')
            ->from('ngsyliusproduct')
            ->where(
                $query->expr()->eq('contentobject_id', ':contentobject_id')
            )
            ->setParameter('contentobject_id', $versionInfo->contentInfo->id, Type::INTEGER);

        $statement = $query->execute();

        $rows = $statement->fetchAll(PDO::FETCH_ASSOC);

        return !empty($rows[0]['product_id']) ? (int) $rows[0]['product_id'] : null;
    }