Capture Database Connection error

Module.php

<?php

namespace Application;

use Application\Exception\ParserException;
use Application\Model\User;
use Application\Schema\SchemaGateway;
use Zend\Db\ResultSet\ResultSet;
use Zend\EventManager\EventManagerInterface;
use Zend\Mvc\ModuleRouteListener;
use Zend\Mvc\MvcEvent;
use Zend\ServiceManager\ServiceManager;
use Zend\Session\Container;
use Zend\View\Model\ViewModel;

class Module
{
	public function onBootstrap( MvcEvent $mvcEvent )
	{
		/**
		 * @var $eventManager EventManagerInterface
		 */
		$eventManager = $mvcEvent->getApplication()->getEventManager();

		$this->startSession( $mvcEvent );

		$eventManager->attach(
			MvcEvent::EVENT_DISPATCH_ERROR, function ( MvcEvent $e )
			{
				if ( $exception = $e->getParam( 'exception' ) )
				{
					if ( ParserException::create( $exception )->isInvalidQueryException() )
					{
						$dbAdapter          = $e->getApplication()->getServiceManager()->get( 'Zend\Db\Adapter\Adapter' );
						$resultSetPrototype = new ResultSet();
						$resultSetPrototype->setArrayObjectPrototype( new User() );

						$schema = new SchemaGateway( 'user', $dbAdapter, null, $resultSetPrototype );
						if ( $schema->isSchemaHealed( $exception ) )
						{
							/**
							 * @var $controller \Zend\Mvc\Controller\AbstractActionController
							 */
							$controller = $e->getTarget();
							$controller->redirect()->refresh();
						}
					}
				}
			}
		);

		$moduleRouteListener = new ModuleRouteListener();
		$moduleRouteListener->attach( $eventManager );
	}

	private function startSession( MvcEvent $mvcEvent )
	{
		/**
		 * @var $serviceManager ServiceManager
		 */
		$serviceManager = $mvcEvent->getApplication()->getServiceManager();
		try
		{
			$dbAdapter = $serviceManager->get( 'Zend\Db\Adapter\Adapter' );
			$dbAdapter->getDriver()->getConnection()->connect();

			$sessionManager = $serviceManager->get( 'DatabaseSessionManager' );
			$sessionManager->start();
			Container::setDefaultManager( $sessionManager );
		}
		catch ( \Exception $exc )
		{
			$ViewModel = $mvcEvent->getViewModel();
			$ViewModel->setTemplate( 'layout/error-layout' );

			$content = new ViewModel();
			$content->setTemplate( 'error/503' );
			$ViewModel->setVariable(
				'content', $serviceManager->get( 'ViewRenderer' )->render( $content )
			);

			exit( $serviceManager->get( 'ViewRenderer' )->render( $ViewModel ) );
		}
	}

	public function getConfig()
	{
		return include __DIR__ . '/config/module.config.php';
	}

	public function getServiceConfig()
	{
		return array (
			'factories' => array (
				'Application\Model\UserTable' => 'Application\Factory\UserTableFactory',
				'Application\Model\UserRegisterLocationTable' => 'Application\Factory\UserRegisterLocationTableFactory',
				'Application\Model\GeoLocationTable' => 'Application\Factory\GeoLocationTableFactory',
				'Application\Model\RegionTable' => 'Application\Factory\RegionTableFactory',
				'Application\Model\CountryTable' => 'Application\Factory\CountryTableFactory',
				'Application\Model\IpAddressLocationTable' => 'Application\Factory\IpAddressLocationTableFactory',
				'Application\Model\UserActivityLocationTable' => 'Application\Factory\UserActivityLocationTableFactory',
				'DatabaseSessionManager' => 'Application\Factory\SessionManagerFactory',
			),
		);
	}

	public function getAutoLoaderConfig() { }
}