Doctrine\ODM\MongoDB\Configuration::setDefaultDB PHP Method

    public function setDefaultDB($defaultDB)
    {
        $this->attributes['defaultDB'] = $defaultDB;
    }

 /**
  *
  * @param \Zend\ServiceManager\ServiceLocatorInterface $serviceLocator
  * @return object
  */
 public function createService(ServiceLocatorInterface $serviceLocator)
 {
     $manifest = $serviceLocator->get('manifest');
     $config = new Configuration();
     $config->setProxyDir(__DIR__ . '/../../../../Proxies');
     $config->setProxyNamespace('Proxies');
     $config->setHydratorDir(__DIR__ . '/../../../../Hydrators');
     $config->setHydratorNamespace('Hydrators');
     $config->setDefaultDB(self::DEFAULT_DB);
     $config->setMetadataCacheImpl(new ArrayCache());
     //create driver chain
     $chain = new MappingDriverChain();
     foreach ($manifest['documents'] as $namespace => $path) {
         $driver = new AnnotationDriver(new AnnotationReader(), $path);
         $chain->addDriver($driver, $namespace);
     }
     $config->setMetadataDriverImpl($chain);
     //register filters
     foreach ($manifest['filters'] as $name => $class) {
         $config->addFilter($name, $class);
     }
     //create event manager
     $eventManager = new EventManager();
     foreach ($manifest['subscribers'] as $subscriber) {
         $eventManager->addEventSubscriber($serviceLocator->get($subscriber));
     }
     //register annotations
     AnnotationRegistry::registerLoader(function ($className) {
         return class_exists($className);
     });
     $conn = new Connection(null, array(), $config);
     return DocumentManager::create($conn, $config, $eventManager);
 }