nextcloud / server

core/Command/Db/ConvertType.php

Indentation +419 added lines, -419 removed lines

@@ -57,423 +57,423 @@
 use function preg_quote;
 
 class ConvertType extends Command implements CompletionAwareInterface {
-	/**
-	 * @var \OCP\IConfig
-	 */
-	protected $config;
-
-	/**
-	 * @var \OC\DB\ConnectionFactory
-	 */
-	protected $connectionFactory;
-
-	/** @var array */
-	protected $columnTypes;
-
-	/**
-	 * @param \OCP\IConfig $config
-	 * @param \OC\DB\ConnectionFactory $connectionFactory
-	 */
-	public function __construct(IConfig $config, ConnectionFactory $connectionFactory) {
-		$this->config = $config;
-		$this->connectionFactory = $connectionFactory;
-		parent::__construct();
-	}
-
-	protected function configure() {
-		$this
-			->setName('db:convert-type')
-			->setDescription('Convert the Nextcloud database to the newly configured one')
-			->addArgument(
-				'type',
-				InputArgument::REQUIRED,
-				'the type of the database to convert to'
-			)
-			->addArgument(
-				'username',
-				InputArgument::REQUIRED,
-				'the username of the database to convert to'
-			)
-			->addArgument(
-				'hostname',
-				InputArgument::REQUIRED,
-				'the hostname of the database to convert to'
-			)
-			->addArgument(
-				'database',
-				InputArgument::REQUIRED,
-				'the name of the database to convert to'
-			)
-			->addOption(
-				'port',
-				null,
-				InputOption::VALUE_REQUIRED,
-				'the port of the database to convert to'
-			)
-			->addOption(
-				'password',
-				null,
-				InputOption::VALUE_REQUIRED,
-				'the password of the database to convert to. Will be asked when not specified. Can also be passed via stdin.'
-			)
-			->addOption(
-				'clear-schema',
-				null,
-				InputOption::VALUE_NONE,
-				'remove all tables from the destination database'
-			)
-			->addOption(
-				'all-apps',
-				null,
-				InputOption::VALUE_NONE,
-				'whether to create schema for all apps instead of only installed apps'
-			)
-			->addOption(
-				'chunk-size',
-				null,
-				InputOption::VALUE_REQUIRED,
-				'the maximum number of database rows to handle in a single query, bigger tables will be handled in chunks of this size. Lower this if the process runs out of memory during conversion.',
-				1000
-			)
-		;
-	}
-
-	protected function validateInput(InputInterface $input, OutputInterface $output) {
-		$type = $this->connectionFactory->normalizeType($input->getArgument('type'));
-		if ($type === 'sqlite3') {
-			throw new \InvalidArgumentException(
-				'Converting to SQLite (sqlite3) is currently not supported.'
-			);
-		}
-		if ($type === $this->config->getSystemValue('dbtype', '')) {
-			throw new \InvalidArgumentException(sprintf(
-				'Can not convert from %1$s to %1$s.',
-				$type
-			));
-		}
-		if ($type === 'oci' && $input->getOption('clear-schema')) {
-			// Doctrine unconditionally tries (at least in version 2.3)
-			// to drop sequence triggers when dropping a table, even though
-			// such triggers may not exist. This results in errors like
-			// "ORA-04080: trigger 'OC_STORAGES_AI_PK' does not exist".
-			throw new \InvalidArgumentException(
-				'The --clear-schema option is not supported when converting to Oracle (oci).'
-			);
-		}
-	}
-
-	protected function readPassword(InputInterface $input, OutputInterface $output) {
-		// Explicitly specified password
-		if ($input->getOption('password')) {
-			return;
-		}
-
-		// Read from stdin. stream_set_blocking is used to prevent blocking
-		// when nothing is passed via stdin.
-		stream_set_blocking(STDIN, 0);
-		$password = file_get_contents('php://stdin');
-		stream_set_blocking(STDIN, 1);
-		if (trim($password) !== '') {
-			$input->setOption('password', $password);
-			return;
-		}
-
-		// Read password by interacting
-		if ($input->isInteractive()) {
-			/** @var QuestionHelper $helper */
-			$helper = $this->getHelper('question');
-			$question = new Question('What is the database password?');
-			$question->setHidden(true);
-			$question->setHiddenFallback(false);
-			$password = $helper->ask($input, $output, $question);
-			$input->setOption('password', $password);
-			return;
-		}
-	}
-
-	protected function execute(InputInterface $input, OutputInterface $output): int {
-		$this->validateInput($input, $output);
-		$this->readPassword($input, $output);
-
-		/** @var Connection $fromDB */
-		$fromDB = \OC::$server->get(Connection::class);
-		$toDB = $this->getToDBConnection($input, $output);
-
-		if ($input->getOption('clear-schema')) {
-			$this->clearSchema($toDB, $input, $output);
-		}
-
-		$this->createSchema($fromDB, $toDB, $input, $output);
-
-		$toTables = $this->getTables($toDB);
-		$fromTables = $this->getTables($fromDB);
-
-		// warn/fail if there are more tables in 'from' database
-		$extraFromTables = array_diff($fromTables, $toTables);
-		if (!empty($extraFromTables)) {
-			$output->writeln('<comment>The following tables will not be converted:</comment>');
-			$output->writeln($extraFromTables);
-			if (!$input->getOption('all-apps')) {
-				$output->writeln('<comment>Please note that tables belonging to available but currently not installed apps</comment>');
-				$output->writeln('<comment>can be included by specifying the --all-apps option.</comment>');
-			}
-
-			$continueConversion = !$input->isInteractive(); // assume yes for --no-interaction and no otherwise.
-			$question = new ConfirmationQuestion('Continue with the conversion (y/n)? [n] ', $continueConversion);
-
-			/** @var QuestionHelper $helper */
-			$helper = $this->getHelper('question');
-
-			if (!$helper->ask($input, $output, $question)) {
-				return 1;
-			}
-		}
-		$intersectingTables = array_intersect($toTables, $fromTables);
-		$this->convertDB($fromDB, $toDB, $intersectingTables, $input, $output);
-		return 0;
-	}
-
-	protected function createSchema(Connection $fromDB, Connection $toDB, InputInterface $input, OutputInterface $output) {
-		$output->writeln('<info>Creating schema in new database</info>');
-
-		$fromMS = new MigrationService('core', $fromDB);
-		$currentMigration = $fromMS->getMigration('current');
-		if ($currentMigration !== '0') {
-			$toMS = new MigrationService('core', $toDB);
-			$toMS->migrate($currentMigration);
-		}
-
-		$schemaManager = new \OC\DB\MDB2SchemaManager($toDB);
-		$apps = $input->getOption('all-apps') ? \OC_App::getAllApps() : \OC_App::getEnabledApps();
-		foreach ($apps as $app) {
-			$output->writeln('<info> - '.$app.'</info>');
-			if (file_exists(\OC_App::getAppPath($app).'/appinfo/database.xml')) {
-				$schemaManager->createDbFromStructure(\OC_App::getAppPath($app).'/appinfo/database.xml');
-			} else {
-				// Make sure autoloading works...
-				\OC_App::loadApp($app);
-				$fromMS = new MigrationService($app, $fromDB);
-				$currentMigration = $fromMS->getMigration('current');
-				if ($currentMigration !== '0') {
-					$toMS = new MigrationService($app, $toDB);
-					$toMS->migrate($currentMigration, true);
-				}
-			}
-		}
-	}
-
-	protected function getToDBConnection(InputInterface $input, OutputInterface $output) {
-		$type = $input->getArgument('type');
-		$connectionParams = $this->connectionFactory->createConnectionParams();
-		$connectionParams = array_merge($connectionParams, [
-			'host' => $input->getArgument('hostname'),
-			'user' => $input->getArgument('username'),
-			'password' => $input->getOption('password'),
-			'dbname' => $input->getArgument('database'),
-		]);
-		if ($input->getOption('port')) {
-			$connectionParams['port'] = $input->getOption('port');
-		}
-		return $this->connectionFactory->getConnection($type, $connectionParams);
-	}
-
-	protected function clearSchema(Connection $db, InputInterface $input, OutputInterface $output) {
-		$toTables = $this->getTables($db);
-		if (!empty($toTables)) {
-			$output->writeln('<info>Clearing schema in new database</info>');
-		}
-		foreach ($toTables as $table) {
-			$db->getSchemaManager()->dropTable($table);
-		}
-	}
-
-	protected function getTables(Connection $db) {
-		$db->getConfiguration()->setSchemaAssetsFilter(function ($asset) {
-			/** @var string|AbstractAsset $asset */
-			$filterExpression = '/^' . preg_quote($this->config->getSystemValue('dbtableprefix', 'oc_')) . '/';
-			if ($asset instanceof AbstractAsset) {
-				return preg_match($filterExpression, $asset->getName()) !== false;
-			}
-			return preg_match($filterExpression, $asset) !== false;
-		});
-		return $db->getSchemaManager()->listTableNames();
-	}
-
-	/**
-	 * @param Connection $fromDB
-	 * @param Connection $toDB
-	 * @param Table $table
-	 * @param InputInterface $input
-	 * @param OutputInterface $output
-	 */
-	protected function copyTable(Connection $fromDB, Connection $toDB, Table $table, InputInterface $input, OutputInterface $output) {
-		if ($table->getName() === $toDB->getPrefix() . 'migrations') {
-			$output->writeln('<comment>Skipping migrations table because it was already filled by running the migrations</comment>');
-			return;
-		}
-
-		$chunkSize = $input->getOption('chunk-size');
-
-		$query = $fromDB->getQueryBuilder();
-		$query->automaticTablePrefix(false);
-		$query->select($query->func()->count('*', 'num_entries'))
-			->from($table->getName());
-		$result = $query->execute();
-		$count = $result->fetchOne();
-		$result->closeCursor();
-
-		$numChunks = ceil($count / $chunkSize);
-		if ($numChunks > 1) {
-			$output->writeln('chunked query, ' . $numChunks . ' chunks');
-		}
-
-		$progress = new ProgressBar($output, $count);
-		$progress->setFormat('very_verbose');
-		$progress->start();
-		$redraw = $count > $chunkSize ? 100 : ($count > 100 ? 5 : 1);
-		$progress->setRedrawFrequency($redraw);
-
-		$query = $fromDB->getQueryBuilder();
-		$query->automaticTablePrefix(false);
-		$query->select('*')
-			->from($table->getName())
-			->setMaxResults($chunkSize);
-
-		try {
-			$orderColumns = $table->getPrimaryKeyColumns();
-		} catch (Exception $e) {
-			$orderColumns = [];
-			foreach ($table->getColumns() as $column) {
-				$orderColumns[] = $column->getName();
-			}
-		}
-
-		foreach ($orderColumns as $column) {
-			$query->addOrderBy($column);
-		}
-
-		$insertQuery = $toDB->getQueryBuilder();
-		$insertQuery->automaticTablePrefix(false);
-		$insertQuery->insert($table->getName());
-		$parametersCreated = false;
-
-		for ($chunk = 0; $chunk < $numChunks; $chunk++) {
-			$query->setFirstResult($chunk * $chunkSize);
-
-			$result = $query->execute();
-
-			while ($row = $result->fetch()) {
-				$progress->advance();
-				if (!$parametersCreated) {
-					foreach ($row as $key => $value) {
-						$insertQuery->setValue($key, $insertQuery->createParameter($key));
-					}
-					$parametersCreated = true;
-				}
-
-				foreach ($row as $key => $value) {
-					$type = $this->getColumnType($table, $key);
-					if ($type !== false) {
-						$insertQuery->setParameter($key, $value, $type);
-					} else {
-						$insertQuery->setParameter($key, $value);
-					}
-				}
-				$insertQuery->execute();
-			}
-			$result->closeCursor();
-		}
-		$progress->finish();
-		$output->writeln('');
-	}
-
-	protected function getColumnType(Table $table, $columnName) {
-		$tableName = $table->getName();
-		if (isset($this->columnTypes[$tableName][$columnName])) {
-			return $this->columnTypes[$tableName][$columnName];
-		}
-
-		$type = $table->getColumn($columnName)->getType()->getName();
-
-		switch ($type) {
-			case Types::BLOB:
-			case Types::TEXT:
-				$this->columnTypes[$tableName][$columnName] = IQueryBuilder::PARAM_LOB;
-				break;
-			case Types::BOOLEAN:
-				$this->columnTypes[$tableName][$columnName] = IQueryBuilder::PARAM_BOOL;
-				break;
-			default:
-				$this->columnTypes[$tableName][$columnName] = false;
-		}
-
-		return $this->columnTypes[$tableName][$columnName];
-	}
-
-	protected function convertDB(Connection $fromDB, Connection $toDB, array $tables, InputInterface $input, OutputInterface $output) {
-		$this->config->setSystemValue('maintenance', true);
-		$schema = $fromDB->createSchema();
-
-		try {
-			// copy table rows
-			foreach ($tables as $table) {
-				$output->writeln('<info> - '.$table.'</info>');
-				$this->copyTable($fromDB, $toDB, $schema->getTable($table), $input, $output);
-			}
-			if ($input->getArgument('type') === 'pgsql') {
-				$tools = new \OC\DB\PgSqlTools($this->config);
-				$tools->resynchronizeDatabaseSequences($toDB);
-			}
-			// save new database config
-			$this->saveDBInfo($input);
-		} catch (\Exception $e) {
-			$this->config->setSystemValue('maintenance', false);
-			throw $e;
-		}
-		$this->config->setSystemValue('maintenance', false);
-	}
-
-	protected function saveDBInfo(InputInterface $input) {
-		$type = $input->getArgument('type');
-		$username = $input->getArgument('username');
-		$dbHost = $input->getArgument('hostname');
-		$dbName = $input->getArgument('database');
-		$password = $input->getOption('password');
-		if ($input->getOption('port')) {
-			$dbHost .= ':'.$input->getOption('port');
-		}
-
-		$this->config->setSystemValues([
-			'dbtype' => $type,
-			'dbname' => $dbName,
-			'dbhost' => $dbHost,
-			'dbuser' => $username,
-			'dbpassword' => $password,
-		]);
-	}
-
-	/**
-	 * Return possible values for the named option
-	 *
-	 * @param string $optionName
-	 * @param CompletionContext $context
-	 * @return string[]
-	 */
-	public function completeOptionValues($optionName, CompletionContext $context) {
-		return [];
-	}
-
-	/**
-	 * Return possible values for the named argument
-	 *
-	 * @param string $argumentName
-	 * @param CompletionContext $context
-	 * @return string[]
-	 */
-	public function completeArgumentValues($argumentName, CompletionContext $context) {
-		if ($argumentName === 'type') {
-			return ['mysql', 'oci', 'pgsql'];
-		}
-		return [];
-	}
+    /**
+     * @var \OCP\IConfig
+     */
+    protected $config;
+
+    /**
+     * @var \OC\DB\ConnectionFactory
+     */
+    protected $connectionFactory;
+
+    /** @var array */
+    protected $columnTypes;
+
+    /**
+     * @param \OCP\IConfig $config
+     * @param \OC\DB\ConnectionFactory $connectionFactory
+     */
+    public function __construct(IConfig $config, ConnectionFactory $connectionFactory) {
+        $this->config = $config;
+        $this->connectionFactory = $connectionFactory;
+        parent::__construct();
+    }
+
+    protected function configure() {
+        $this
+            ->setName('db:convert-type')
+            ->setDescription('Convert the Nextcloud database to the newly configured one')
+            ->addArgument(
+                'type',
+                InputArgument::REQUIRED,
+                'the type of the database to convert to'
+            )
+            ->addArgument(
+                'username',
+                InputArgument::REQUIRED,
+                'the username of the database to convert to'
+            )
+            ->addArgument(
+                'hostname',
+                InputArgument::REQUIRED,
+                'the hostname of the database to convert to'
+            )
+            ->addArgument(
+                'database',
+                InputArgument::REQUIRED,
+                'the name of the database to convert to'
+            )
+            ->addOption(
+                'port',
+                null,
+                InputOption::VALUE_REQUIRED,
+                'the port of the database to convert to'
+            )
+            ->addOption(
+                'password',
+                null,
+                InputOption::VALUE_REQUIRED,
+                'the password of the database to convert to. Will be asked when not specified. Can also be passed via stdin.'
+            )
+            ->addOption(
+                'clear-schema',
+                null,
+                InputOption::VALUE_NONE,
+                'remove all tables from the destination database'
+            )
+            ->addOption(
+                'all-apps',
+                null,
+                InputOption::VALUE_NONE,
+                'whether to create schema for all apps instead of only installed apps'
+            )
+            ->addOption(
+                'chunk-size',
+                null,
+                InputOption::VALUE_REQUIRED,
+                'the maximum number of database rows to handle in a single query, bigger tables will be handled in chunks of this size. Lower this if the process runs out of memory during conversion.',
+                1000
+            )
+        ;
+    }
+
+    protected function validateInput(InputInterface $input, OutputInterface $output) {
+        $type = $this->connectionFactory->normalizeType($input->getArgument('type'));
+        if ($type === 'sqlite3') {
+            throw new \InvalidArgumentException(
+                'Converting to SQLite (sqlite3) is currently not supported.'
+            );
+        }
+        if ($type === $this->config->getSystemValue('dbtype', '')) {
+            throw new \InvalidArgumentException(sprintf(
+                'Can not convert from %1$s to %1$s.',
+                $type
+            ));
+        }
+        if ($type === 'oci' && $input->getOption('clear-schema')) {
+            // Doctrine unconditionally tries (at least in version 2.3)
+            // to drop sequence triggers when dropping a table, even though
+            // such triggers may not exist. This results in errors like
+            // "ORA-04080: trigger 'OC_STORAGES_AI_PK' does not exist".
+            throw new \InvalidArgumentException(
+                'The --clear-schema option is not supported when converting to Oracle (oci).'
+            );
+        }
+    }
+
+    protected function readPassword(InputInterface $input, OutputInterface $output) {
+        // Explicitly specified password
+        if ($input->getOption('password')) {
+            return;
+        }
+
+        // Read from stdin. stream_set_blocking is used to prevent blocking
+        // when nothing is passed via stdin.
+        stream_set_blocking(STDIN, 0);
+        $password = file_get_contents('php://stdin');
+        stream_set_blocking(STDIN, 1);
+        if (trim($password) !== '') {
+            $input->setOption('password', $password);
+            return;
+        }
+
+        // Read password by interacting
+        if ($input->isInteractive()) {
+            /** @var QuestionHelper $helper */
+            $helper = $this->getHelper('question');
+            $question = new Question('What is the database password?');
+            $question->setHidden(true);
+            $question->setHiddenFallback(false);
+            $password = $helper->ask($input, $output, $question);
+            $input->setOption('password', $password);
+            return;
+        }
+    }
+
+    protected function execute(InputInterface $input, OutputInterface $output): int {
+        $this->validateInput($input, $output);
+        $this->readPassword($input, $output);
+
+        /** @var Connection $fromDB */
+        $fromDB = \OC::$server->get(Connection::class);
+        $toDB = $this->getToDBConnection($input, $output);
+
+        if ($input->getOption('clear-schema')) {
+            $this->clearSchema($toDB, $input, $output);
+        }
+
+        $this->createSchema($fromDB, $toDB, $input, $output);
+
+        $toTables = $this->getTables($toDB);
+        $fromTables = $this->getTables($fromDB);
+
+        // warn/fail if there are more tables in 'from' database
+        $extraFromTables = array_diff($fromTables, $toTables);
+        if (!empty($extraFromTables)) {
+            $output->writeln('<comment>The following tables will not be converted:</comment>');
+            $output->writeln($extraFromTables);
+            if (!$input->getOption('all-apps')) {
+                $output->writeln('<comment>Please note that tables belonging to available but currently not installed apps</comment>');
+                $output->writeln('<comment>can be included by specifying the --all-apps option.</comment>');
+            }
+
+            $continueConversion = !$input->isInteractive(); // assume yes for --no-interaction and no otherwise.
+            $question = new ConfirmationQuestion('Continue with the conversion (y/n)? [n] ', $continueConversion);
+
+            /** @var QuestionHelper $helper */
+            $helper = $this->getHelper('question');
+
+            if (!$helper->ask($input, $output, $question)) {
+                return 1;
+            }
+        }
+        $intersectingTables = array_intersect($toTables, $fromTables);
+        $this->convertDB($fromDB, $toDB, $intersectingTables, $input, $output);
+        return 0;
+    }
+
+    protected function createSchema(Connection $fromDB, Connection $toDB, InputInterface $input, OutputInterface $output) {
+        $output->writeln('<info>Creating schema in new database</info>');
+
+        $fromMS = new MigrationService('core', $fromDB);
+        $currentMigration = $fromMS->getMigration('current');
+        if ($currentMigration !== '0') {
+            $toMS = new MigrationService('core', $toDB);
+            $toMS->migrate($currentMigration);
+        }
+
+        $schemaManager = new \OC\DB\MDB2SchemaManager($toDB);
+        $apps = $input->getOption('all-apps') ? \OC_App::getAllApps() : \OC_App::getEnabledApps();
+        foreach ($apps as $app) {
+            $output->writeln('<info> - '.$app.'</info>');
+            if (file_exists(\OC_App::getAppPath($app).'/appinfo/database.xml')) {
+                $schemaManager->createDbFromStructure(\OC_App::getAppPath($app).'/appinfo/database.xml');
+            } else {
+                // Make sure autoloading works...
+                \OC_App::loadApp($app);
+                $fromMS = new MigrationService($app, $fromDB);
+                $currentMigration = $fromMS->getMigration('current');
+                if ($currentMigration !== '0') {
+                    $toMS = new MigrationService($app, $toDB);
+                    $toMS->migrate($currentMigration, true);
+                }
+            }
+        }
+    }
+
+    protected function getToDBConnection(InputInterface $input, OutputInterface $output) {
+        $type = $input->getArgument('type');
+        $connectionParams = $this->connectionFactory->createConnectionParams();
+        $connectionParams = array_merge($connectionParams, [
+            'host' => $input->getArgument('hostname'),
+            'user' => $input->getArgument('username'),
+            'password' => $input->getOption('password'),
+            'dbname' => $input->getArgument('database'),
+        ]);
+        if ($input->getOption('port')) {
+            $connectionParams['port'] = $input->getOption('port');
+        }
+        return $this->connectionFactory->getConnection($type, $connectionParams);
+    }
+
+    protected function clearSchema(Connection $db, InputInterface $input, OutputInterface $output) {
+        $toTables = $this->getTables($db);
+        if (!empty($toTables)) {
+            $output->writeln('<info>Clearing schema in new database</info>');
+        }
+        foreach ($toTables as $table) {
+            $db->getSchemaManager()->dropTable($table);
+        }
+    }
+
+    protected function getTables(Connection $db) {
+        $db->getConfiguration()->setSchemaAssetsFilter(function ($asset) {
+            /** @var string|AbstractAsset $asset */
+            $filterExpression = '/^' . preg_quote($this->config->getSystemValue('dbtableprefix', 'oc_')) . '/';
+            if ($asset instanceof AbstractAsset) {
+                return preg_match($filterExpression, $asset->getName()) !== false;
+            }
+            return preg_match($filterExpression, $asset) !== false;
+        });
+        return $db->getSchemaManager()->listTableNames();
+    }
+
+    /**
+     * @param Connection $fromDB
+     * @param Connection $toDB
+     * @param Table $table
+     * @param InputInterface $input
+     * @param OutputInterface $output
+     */
+    protected function copyTable(Connection $fromDB, Connection $toDB, Table $table, InputInterface $input, OutputInterface $output) {
+        if ($table->getName() === $toDB->getPrefix() . 'migrations') {
+            $output->writeln('<comment>Skipping migrations table because it was already filled by running the migrations</comment>');
+            return;
+        }
+
+        $chunkSize = $input->getOption('chunk-size');
+
+        $query = $fromDB->getQueryBuilder();
+        $query->automaticTablePrefix(false);
+        $query->select($query->func()->count('*', 'num_entries'))
+            ->from($table->getName());
+        $result = $query->execute();
+        $count = $result->fetchOne();
+        $result->closeCursor();
+
+        $numChunks = ceil($count / $chunkSize);
+        if ($numChunks > 1) {
+            $output->writeln('chunked query, ' . $numChunks . ' chunks');
+        }
+
+        $progress = new ProgressBar($output, $count);
+        $progress->setFormat('very_verbose');
+        $progress->start();
+        $redraw = $count > $chunkSize ? 100 : ($count > 100 ? 5 : 1);
+        $progress->setRedrawFrequency($redraw);
+
+        $query = $fromDB->getQueryBuilder();
+        $query->automaticTablePrefix(false);
+        $query->select('*')
+            ->from($table->getName())
+            ->setMaxResults($chunkSize);
+
+        try {
+            $orderColumns = $table->getPrimaryKeyColumns();
+        } catch (Exception $e) {
+            $orderColumns = [];
+            foreach ($table->getColumns() as $column) {
+                $orderColumns[] = $column->getName();
+            }
+        }
+
+        foreach ($orderColumns as $column) {
+            $query->addOrderBy($column);
+        }
+
+        $insertQuery = $toDB->getQueryBuilder();
+        $insertQuery->automaticTablePrefix(false);
+        $insertQuery->insert($table->getName());
+        $parametersCreated = false;
+
+        for ($chunk = 0; $chunk < $numChunks; $chunk++) {
+            $query->setFirstResult($chunk * $chunkSize);
+
+            $result = $query->execute();
+
+            while ($row = $result->fetch()) {
+                $progress->advance();
+                if (!$parametersCreated) {
+                    foreach ($row as $key => $value) {
+                        $insertQuery->setValue($key, $insertQuery->createParameter($key));
+                    }
+                    $parametersCreated = true;
+                }
+
+                foreach ($row as $key => $value) {
+                    $type = $this->getColumnType($table, $key);
+                    if ($type !== false) {
+                        $insertQuery->setParameter($key, $value, $type);
+                    } else {
+                        $insertQuery->setParameter($key, $value);
+                    }
+                }
+                $insertQuery->execute();
+            }
+            $result->closeCursor();
+        }
+        $progress->finish();
+        $output->writeln('');
+    }
+
+    protected function getColumnType(Table $table, $columnName) {
+        $tableName = $table->getName();
+        if (isset($this->columnTypes[$tableName][$columnName])) {
+            return $this->columnTypes[$tableName][$columnName];
+        }
+
+        $type = $table->getColumn($columnName)->getType()->getName();
+
+        switch ($type) {
+            case Types::BLOB:
+            case Types::TEXT:
+                $this->columnTypes[$tableName][$columnName] = IQueryBuilder::PARAM_LOB;
+                break;
+            case Types::BOOLEAN:
+                $this->columnTypes[$tableName][$columnName] = IQueryBuilder::PARAM_BOOL;
+                break;
+            default:
+                $this->columnTypes[$tableName][$columnName] = false;
+        }
+
+        return $this->columnTypes[$tableName][$columnName];
+    }
+
+    protected function convertDB(Connection $fromDB, Connection $toDB, array $tables, InputInterface $input, OutputInterface $output) {
+        $this->config->setSystemValue('maintenance', true);
+        $schema = $fromDB->createSchema();
+
+        try {
+            // copy table rows
+            foreach ($tables as $table) {
+                $output->writeln('<info> - '.$table.'</info>');
+                $this->copyTable($fromDB, $toDB, $schema->getTable($table), $input, $output);
+            }
+            if ($input->getArgument('type') === 'pgsql') {
+                $tools = new \OC\DB\PgSqlTools($this->config);
+                $tools->resynchronizeDatabaseSequences($toDB);
+            }
+            // save new database config
+            $this->saveDBInfo($input);
+        } catch (\Exception $e) {
+            $this->config->setSystemValue('maintenance', false);
+            throw $e;
+        }
+        $this->config->setSystemValue('maintenance', false);
+    }
+
+    protected function saveDBInfo(InputInterface $input) {
+        $type = $input->getArgument('type');
+        $username = $input->getArgument('username');
+        $dbHost = $input->getArgument('hostname');
+        $dbName = $input->getArgument('database');
+        $password = $input->getOption('password');
+        if ($input->getOption('port')) {
+            $dbHost .= ':'.$input->getOption('port');
+        }
+
+        $this->config->setSystemValues([
+            'dbtype' => $type,
+            'dbname' => $dbName,
+            'dbhost' => $dbHost,
+            'dbuser' => $username,
+            'dbpassword' => $password,
+        ]);
+    }
+
+    /**
+     * Return possible values for the named option
+     *
+     * @param string $optionName
+     * @param CompletionContext $context
+     * @return string[]
+     */
+    public function completeOptionValues($optionName, CompletionContext $context) {
+        return [];
+    }
+
+    /**
+     * Return possible values for the named argument
+     *
+     * @param string $argumentName
+     * @param CompletionContext $context
+     * @return string[]
+     */
+    public function completeArgumentValues($argumentName, CompletionContext $context) {
+        if ($argumentName === 'type') {
+            return ['mysql', 'oci', 'pgsql'];
+        }
+        return [];
+    }
 }