Doctrine2 Generate Entities form Existing Database

generator.php

<?php
include '../vendor/autoload.php';
$classLoader = new \Doctrine\Common\ClassLoader('Entities', __DIR__);
$classLoader->register();

$classLoader = new \Doctrine\Common\ClassLoader('Proxies', __DIR__);
$classLoader->register();

// config
$config = new \Doctrine\ORM\Configuration();
$config->setMetadataDriverImpl($config->newDefaultAnnotationDriver(__DIR__ . '/Entities'));
$config->setMetadataCacheImpl(new \Doctrine\Common\Cache\ArrayCache);
$config->setProxyDir(__DIR__ . '/Proxies');
$config->setProxyNamespace('Proxies');


$connectionParams = array(
    'driver' => 'pdo_mysql',
    'host' => 'localhost',
    'port' => '3306',
    'user' => 'root',
    'password' => 'root',
    'dbname' => 'dbname',
    'charset' => 'utf8',
);

$em = \Doctrine\ORM\EntityManager::create($connectionParams, $config);

// custom datatypes (not mapped for reverse engineering)
$em->getConnection()->getDatabasePlatform()->registerDoctrineTypeMapping('set', 'string');
$em->getConnection()->getDatabasePlatform()->registerDoctrineTypeMapping('enum', 'string');

// fetch metadata
$driver = new \Doctrine\ORM\Mapping\Driver\DatabaseDriver(
                $em->getConnection()->getSchemaManager()
);
$em->getConfiguration()->setMetadataDriverImpl($driver);
$cmf = new \Doctrine\ORM\Tools\DisconnectedClassMetadataFactory($em);
$cmf->setEntityManager($em);
$classes = $driver->getAllClassNames();
$metadata = $cmf->getAllMetadata();
$generator = new Doctrine\ORM\Tools\EntityGenerator();
$generator->setUpdateEntityIfExists(true);
$generator->setGenerateStubMethods(true);
$generator->setGenerateAnnotations(true);
$generator->generate($metadata, __DIR__ . '/Entities');
print 'Done!';

Its interesting that code generation got deprecated and to be removed in version 3.
Via EntityGenerator as in example above or through cli.
I wonder how would one get started with preexisting databases then (after v3 is stable)? probably just writing from scratch which seems pita.

see notes here: https://github.com/doctrine/orm/blob/3.0.x/UPGRADE.md

Deprecated code generators and related console commands
These console commands have been deprecated:
orm:convert-mapping
orm:generate:entities
orm:generate-repositories
These classes have been deprecated:
Doctrine\ORM\Tools\EntityGenerator
Doctrine\ORM\Tools\EntityRepositoryGenerator
Whole Doctrine\ORM\Tools\Export namespace with all its members have been deprecated as well.