installation-bundle/src/Database/ConnectionFactory.php
public static function create(array $parameters): ?Connection
    {
        $params = [
            'driver' => 'pdo_mysql',
            'host' => $parameters['parameters']['database_host'],
            'port' => $parameters['parameters']['database_port'],
            'user' => $parameters['parameters']['database_user'],
            'password' => $parameters['parameters']['database_password'],
            'dbname' => $parameters['parameters']['database_name'],
        ];

        try {
            return DriverManager::getConnection($params);
        } catch (DBALException $e) {
            // ignore
        }

        return null;
    }
public static function create(array $parameters): ?Connection
    {
        $params = [
            'driver' => 'pdo_mysql',
            'host' => $parameters['parameters']['database_host'],
            'port' => $parameters['parameters']['database_port'],
            'user' => $parameters['parameters']['database_user'],
            'password' => $parameters['parameters']['database_password'],
            'dbname' => $parameters['parameters']['database_name'],
        ];

        try {
            return DriverManager::getConnection($params);
        } catch (DBALException $e) {
            // ignore
        }

        return null;
    }
Returns the database connection object.