initDatabaseConnection example

$connectionInfo = $this->getConnectionInfoFromConfig(SW_PATH . '/config.php', $connectionInfo);
        $connectionInfo = $this->getConnectionInfoFromArgs($input, $connectionInfo);
        $connectionInfo = $this->getConnectionInfoFromInteractiveShell(
            $this->IOHelper,
            $connectionInfo
        );

        /** @var ConfigWriter $configWriter */
        $configWriter = $this->container->offsetGet('config.writer');
        $configWriter->writeConfig($connectionInfo);

        $conn = $this->initDatabaseConnection($connectionInfo, $container);
        $databaseService = new DatabaseService($conn);

        $databaseService->createDatabase($connectionInfo->databaseName);
        $databaseService->selectDatabase($connectionInfo->databaseName);

        $skipImport = $databaseService->containsShopwareSchema()
            && $input->getOption('no-skip-import')
            && $this->shouldSkipImport();

        if (!$skipImport) {
            $this->importDatabase();