Doctrine.php

<?php

use Doctrine\Common\ClassLoader,
    Doctrine\ORM\Tools\Setup,
    Doctrine\ORM\EntityManager;

class Doctrine {

    public $em;

    public function __construct() {

        Doctrine\Common\Annotations\AnnotationRegistry::registerFile(
                __DIR__ . '/doctrine/orm/lib/Doctrine/ORM/Mapping/Driver/DoctrineAnnotations.php'
        );

        // Load the database configuration from CodeIgniter
        require __DIR__ . '/../config/' . ENVIRONMENT . '/database.php';

        $connection_options = array(
            'driver' => 'pdo_'.$db['default']['dbdriver'],
            'user' => $db['default']['username'],
            'password' => $db['default']['password'],
            'host' => $db['default']['hostname'],
            'dbname' => $db['default']['database'],
            'charset' => $db['default']['char_set'],
            'driverOptions' => array(
                'charset' => $db['default']['char_set'],
            ),
        );

        // With this configuration, your model files need to be in application/models/Entity
        // e.g. Creating a new Entity\User loads the class from application/models/Entity/User.php
        $models_namespace = 'Entity';
        $models_path = __DIR__ . '/../models';
        $proxies_dir = __DIR__ . '/../models/Proxies';
        $metadata_paths = array(__DIR__ . '/../models/xml-mappings');

        // Set $dev_mode to TRUE to disable caching while you develop
        $config = new Doctrine\ORM\Configuration;
        $config->setProxyDir(sys_get_temp_dir());
        $config->setProxyNamespace('Proxy');
        //$config = Setup::createXMLMetadataConfiguration($metadata_paths, ENVIRONMENT == 'development', $proxies_dir);

        $driverChain = new Doctrine\Common\Persistence\Mapping\Driver\MappingDriverChain();
        $driverChain->addDriver(new Doctrine\ORM\Mapping\Driver\XmlDriver(__DIR__ . '/../models/xml-mappings'), 'Entity');

        Gedmo\DoctrineExtensions::registerAbstractMappingIntoDriverChainORM($driverChain);

        $config->setMetadataDriverImpl($driverChain);

        $evm = new Doctrine\Common\EventManager();

        $timestampableListener = new Gedmo\Timestampable\TimestampableListener;
        $evm->addEventSubscriber($timestampableListener);

        $evm->addEventSubscriber(new Doctrine\DBAL\Event\Listeners\MysqlSessionInit());

        $this->em = EntityManager::create($connection_options, $config, $evm);
         
        $loader = new ClassLoader($models_namespace, $models_path);
        $loader->register();
    }

}