Piwik\DbHelper::isInstalled PHP Method

    public static function isInstalled()
    {
        try {
            return Schema::getInstance()->hasTables();
        } catch (Exception $e) {
            return false;
        }
    }

 protected function makeUpdate(InputInterface $input, OutputInterface $output, $doDryRun)
 {
     $this->checkAllRequiredOptionsAreNotEmpty($input);
     $updater = $this->makeUpdaterInstance($output);
     $componentsWithUpdateFile = $updater->getComponentUpdates();
     if (empty($componentsWithUpdateFile)) {
         throw new NoUpdatesFoundException("Everything is already up to date.");
     }
     $output->writeln(array("", "    *** " . Piwik::translate('CoreUpdater_UpdateTitle') . " ***"));
     // handle case of existing database with no tables
     if (!DbHelper::isInstalled()) {
         $this->handleCoreError($output, Piwik::translate('CoreUpdater_EmptyDatabaseError', Config::getInstance()->database['dbname']));
         return;
     }
     $output->writeln(array("", "    " . Piwik::translate('CoreUpdater_DatabaseUpgradeRequired'), "", "    " . Piwik::translate('CoreUpdater_YourDatabaseIsOutOfDate')));
     if ($this->isUpdatingCore($componentsWithUpdateFile)) {
         $currentVersion = $this->getCurrentVersionForCore($updater);
         $output->writeln(array("", "    " . Piwik::translate('CoreUpdater_PiwikWillBeUpgradedFromVersionXToVersionY', array($currentVersion, Version::VERSION))));
     }
     $pluginsToUpdate = $this->getPluginsToUpdate($componentsWithUpdateFile);
     if (!empty($pluginsToUpdate)) {
         $output->writeln(array("", "    " . Piwik::translate('CoreUpdater_TheFollowingPluginsWillBeUpgradedX', implode(', ', $pluginsToUpdate))));
     }
     $dimensionsToUpdate = $this->getDimensionsToUpdate($componentsWithUpdateFile);
     if (!empty($dimensionsToUpdate)) {
         $output->writeln(array("", "    " . Piwik::translate('CoreUpdater_TheFollowingDimensionsWillBeUpgradedX', implode(', ', $dimensionsToUpdate))));
     }
     $output->writeln("");
     if ($doDryRun) {
         $this->doDryRun($updater, $output);
     } else {
         $this->doRealUpdate($updater, $componentsWithUpdateFile, $output);
     }
 }