Generate Symfony 4 entities + repositories from existing database

doctrinemap.php

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


class RepoGen extends Doctrine\ORM\Tools\EntityRepositoryGenerator {
    protected static $_template =
'<?php

namespace App\Repository;

use App\Entity\__ENTITY__;
use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
use Symfony\Bridge\Doctrine\RegistryInterface;

/**
 * @method __ENTITY__|null find($id, $lockMode = null, $lockVersion = null)
 * @method __ENTITY__|null findOneBy(array $criteria, array $orderBy = null)
 * @method __ENTITY__[]    findAll()
 * @method __ENTITY__[]    findBy(array $criteria, array $orderBy = null, $limit = null, $offset = null)
 */
class __ENTITY__Repository extends ServiceEntityRepository
{
    public function __construct(RegistryInterface $registry)
    {
        parent::__construct($registry, __ENTITY__::class);
    }

    /*
    public function findBySomething($value)
    {
        return $this->createQueryBuilder(\'g\')
            ->where(\'g.something = :value\')->setParameter(\'value\', $value)
            ->orderBy(\'g.id\', \'ASC\')
            ->setMaxResults(10)
            ->getQuery()
            ->getResult()
        ;
    }
    */
}
';	
protected $entity = '__Entity';
	public function generateEntityRepositoryClass($fullClassName) {
		$val = str_replace('__ENTITY__', $this->entity, self::$_template);
		return $val;
	}
	public function setEntityName($name) {
		$this->entity = $name;
	}
}

// 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()
);
$driver->setNamespace('App\Entity\\');
$em->getConfiguration()->setMetadataDriverImpl($driver);
$cmf = new \Doctrine\ORM\Tools\DisconnectedClassMetadataFactory($em);
$cmf->setEntityManager($em);
$classes = $driver->getAllClassNames();
$metadata = $cmf->getAllMetadata();
foreach ($metadata as $md) {
	$md->setCustomRepositoryClass(str_replace('App\Entity\\', 'App\Repository\\', $md->getName().'Repository'));
}
$generator = new Doctrine\ORM\Tools\EntityGenerator();
$generator->setUpdateEntityIfExists(true);
$generator->setGenerateStubMethods(true);
$generator->setGenerateAnnotations(true);
$generator->generate($metadata, __DIR__ . '/Entities');
$repGenerator = new RepoGen();
foreach ($classes as $className) {
	$className = str_replace('App\Entity\\', '', $className);
	$repGenerator->setEntityName($className);
	$repGenerator->writeEntityRepositoryClass($className.'Repository',__DIR__ . '/Repositories');
}
print 'Done!';

Please bear in mind this is just a helper as a starting point when you're by necessity working with an existing database; generating entities from an existing database is not actually a very good idea, since you are importing design flaws from the start rather than starting by building your entities correctly from the ground up. The generated entities will get about 90% of your basic field types and mappings correct, but you'll need to work on them manually to get the right Doctrine ORM structure for your project.

I just found your work (very good) and as a former dba, I can assure you that the design flow you're feared of came only from developpement team.
I've designed many databases in the past and every flaws came from dev too fierce to ask help from dbas ^^

But thank you for the code ;)

Thank you so much , this script saved me a ton of effort

Thanks a lot for this. I hope they will add this or something like it to Symfony.