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我对简单的树结构有奇怪的问题..

class CourseCategory {
  /** @Id @Column(name="Id", type="integer", unique=true) 
   *  @GeneratedValue
   */
  private $id = null;

  /** @Column(name="Name", length=2000) */
  private $name;

  /**
   * @OneToOne(targetEntity="CourseCategory")
   * @JoinColumn(name="ParentId", referencedColumnName="Id", nullable=true)
   **/
  private $parent;

  /** @Column(name="Slug", length=255) */
  private $slug;

  /** @Column(name="PageTitle", length=2000) */
  private $pageTitle;

  /** @Column(name="Order", type="integer") */
  private $order;

  public function __construct($name, $parent, $slug, $pageTitle, $order) {
    $this->name = $name;
    $this->parent = $parent;
    $this->slug = $slug;
    $this->pageTitle = $pageTitle;
    $this->order = $order;
  }
}

添加新类别：

$category = new CourseCategory($name, $parentCategory, $slug, $pageTitle, 
        $em->createQuery('SELECT COUNT(c.id) FROM Entity\CourseCategory c')->getSingleScalarResult() + 1);
      $em->persist($category);
      $em->flush();

此代码因Syntax error or access violation: 1064异常而失败。它以某种方式尝试将字符串添加到 ParentId 字段中：

check the manual that corresponds to your MySQL server version for the right syntax to use near 'Order, ParentId) VALUES ('123', '123', '123', 47, '1')

有人知道为什么会这样吗？谢谢

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