DbSchemaUpgradeCommand.php

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<?php
namespace Magento\Setup\Console\Command;

use Magento\Framework\App\DeploymentConfig;
use Magento\Setup\Model\InstallerFactory;
use Magento\Framework\Setup\ConsoleLogger;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Output\OutputInterface;

class DbSchemaUpgradeCommand extends AbstractSetupCommand
{
    private $installFactory;

    private $deploymentConfig;

    public function __construct(InstallerFactory $installFactory, DeploymentConfig $deploymentConfig)
    {
        $this->installFactory = $installFactory;
        $this->deploymentConfig = $deploymentConfig;
        parent::__construct();
    }

    protected function configure()
    {
        $this
            ->setName('setup:db-schema:upgrade')
            ->setDefinition(
                [
                    new InputOption(
                        InstallCommand::CONVERT_OLD_SCRIPTS_KEY,
                        null,
                        InputOption::VALUE_OPTIONAL,
                        'Allows to convert old scripts (InstallSchema, UpgradeSchema) to db_schema.xml format',
                        false
                    )
                ]
            )
            ->setDescription('Installs and upgrades the DB schema');
        parent::configure();
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        if (!$this->deploymentConfig->isAvailable()) {
            $output->writeln("<info>No information is available: the Magento application is not installed.</info>");
            // we must have an exit code higher than zero to indicate something was wrong
            return \Magento\Framework\Console\Cli::RETURN_FAILURE;
        }
        $installer = $this->installFactory->create(new ConsoleLogger($output));
        $installer->installSchema($input->getOptions());
        return \Magento\Framework\Console\Cli::RETURN_SUCCESS;
    }
}