Symfony：我无法存储主键值

Question

I have a problem, I have a table (downloads) with two fields: Token (primary key) and value.

I have my entity Downloads with these methods (only show token methods, value works right):

/**
 * @var string
 *
 * @ORM\Column(name="token", type="string", length=45, nullable=false)
 * @ORM\Id
 * @ORM\GeneratedValue(strategy="IDENTITY")
 */
private $token;

/**
 * Set token
 *
 * @param string $token
 * @return Downloads
 */

public function setToken($token)
{
    $this->token = $token;

    return $this;
}

/**
 * Get token
 *
 * @return string 
 */
public function getToken()
{
    return $this->token;
}

But, when I do this in my controller:

$em = $this->getDoctrine()->getManager();
$Download = new Downloads();
        $Download->setToken($token);       
        $Download->setValid($now); 
$em->persist($Download); 
$em->flush();

Object is well created, but in my database Valid is stored correctly, and token is store empty!!

if I see the values, util $em->flush(); object download has two correct values, but after this, token (primary key) disappear his value.

How can I do?

Answer 1

you have to create auto increment for your columns like this

 /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;