app/bundles/CoreBundle/Doctrine/DatabasePlatform.php

<?php

declare(strict_types=1);

namespace Mautic\CoreBundle\Doctrine;

use Doctrine\DBAL\Platforms\AbstractMySQLPlatform;
use Doctrine\DBAL\Platforms\AbstractPlatform;
use Doctrine\DBAL\Platforms\DB2Platform;
use Doctrine\DBAL\Platforms\OraclePlatform;
use Doctrine\DBAL\Platforms\PostgreSQLPlatform;
use Doctrine\DBAL\Platforms\SqlitePlatform;
use Doctrine\DBAL\Platforms\SQLServerPlatform;

/**
 * A workaround for deprecated \Doctrine\DBAL\Platforms\AbstractPlatform::getName.
 */
class DatabasePlatform
{
    public static function getDatabasePlatform(AbstractPlatform $platform): string
    {
        if ($platform instanceof AbstractMySQLPlatform) {
            return 'mysql';
        }

        if ($platform instanceof DB2Platform) {
            return 'db2';
        }

        if ($platform instanceof OraclePlatform) {
            return 'oracle';
        }

        if ($platform instanceof PostgreSQLPlatform) {
            return 'postgresql';
        }

        if ($platform instanceof SQLServerPlatform) {
            return 'mssql';
        }

        if ($platform instanceof SqlitePlatform) {
            return 'sqlite';
        }

        throw new \RuntimeException('Unknown platform '.$platform::class);
    }
}