/src/AppBundle/Entity/Account.php:

<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Doctrine\ORM\Mapping\UniqueConstraint;
use Doctrine\ORM\Mapping\SequenceGenerator;

/**
 * @ORM\Entity
 * @ORM\Table(name="account")
 */
class Account {

    /**
     * @ORM\Column(type="integer", nullable=false)
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=100, unique=true)
     */
    private $username;

    /**
     * @ORM\Column(type="string", length=100)
     */
    private $password;

    public function __construct($username) {
        $this->username = $username;
    }

    function setPassword ($password) {
        $this->password = $password;
    }

    function getUsername() {
        return $this->username;
    }

    function getPassword() {
        return $this->password;
    }
}