#Acme\StudyBundle\Entity\User.php


namespace Acme\StudyBundle\Entity;
/**
 * Acme\StudyBundle\Entity\User
 *
 * @orm:Table(name="users")
 * @orm:Entity
 */
class User
{
       /**
     * @orm:Id
     * @orm:Column(name="id", type="integer")
     * @orm:GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @orm:Column(type="string", length="255")
     */
    protected $name;
}

#app/config/config.yml
# Doctrine Configuration
doctrine:
    dbal:
        driver:   %database_driver%
        host:     %database_host%
        dbname:   %database_name%
        user:     %database_user%
        password: %database_password%

    orm:
        auto_generate_proxy_classes: %kernel.debug%
        auto_mapping: true