Doctrine2 SQLSTATE [42000]：语法错误或访问冲突：1064

User.php;

user.php的;

<?php

namespace Acme\DemoBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 * @ORM\Table(name="like")
 * @ORM\InheritanceType("SINGLE_TABLE")
 * @ORM\DiscriminatorColumn(name="itemtype", type="integer")
 * @ORM\DiscriminatorMap({
 *  "1" = "LikeArticle",
 *  "2" = "LikePage",
 *  "3" = "LikeSite",
 * })
 */
class Like
{
    /**
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;

    /**
     * @ORM\Column(type="integer")
     */
    protected $userid;

    /**
     * @ORM\ManyToOne(targetEntity="User", inversedBy="likes")
     * @ORM\JoinColumn(name="userid", referencedColumnName="id")
     */
    protected $user;
}
<?php

namespace Acme\