懒惰加载原则一对一映射

问题描述

我很难找到正确的结果。

I am having a hard time finding the correct result for this.

我有一对一的映射。有两个表格：用户和users_settings

I have one to one mapping. There are two tables: users and users_settings

我有两个学说实体如下：

I have two doctrine entities as below:

/**
* @ORM\Table(name="users")
* @ORM\Entity
*/
class Users {

   /**
    * @ORM\OneToOne(targetEntity="UsersSettings", mappedBy="user",cascade={"persist"})
   */
   private $userSetting;

   //getters and setters
}

/**
* @ORM\Table(name="notifications_settings")
* @ORM\Entity
*/
Class UsersSettings {

   /**
   * @var Users
   *
   * @ORM\OneToOne(targetEntity="Users", inversedBy="userSetting")
   * @ORM\JoinColumns({
   *   @ORM\JoinColumn(name="user_id", referencedColumnName="id")
   * })
   */
   private $user;
}

每当我提取实体一个如下：

Whenever I fetch entity one as below:

$q = $this
            ->createQueryBuilder('u')
            ->select('u, r')
            ->leftJoin('u.roles', 'r')
            ->where('u.username = :username OR u.email = :email')
            ->setParameter('username', $username)
            ->setParameter('email', $username)
            ->getQuery();

SELECT t0.id AS id1, t0.username AS username2, t0.email AS email3, t0.password AS password4, t29.id AS id30, t29.is_notify_by_email AS is_notify_by_email31, t29.user_id AS user_id32 FROM users t0 LEFT JOIN users_settings t29 ON t29.user_id = t0.id WHERE t0.id = ?

学说立即执行加入到我不想要的usersSettings实体。其他类型的映射像一对多和一对一执行延迟加载，但是在一对一映射的情况下，我无法配置为延迟加载。我如何懒惰加载这种关系？我正在使用教义2.3和symfony 2.1

Doctrine immediately performs join to usersSettings entity which I dont want. Other types of mapping like one to many and many to one performs lazy loading but in case of one to one mapping, I could not configure to lazy load. How can i lazy load this relation ? I am using doctrine 2.3 and symfony 2.1

推荐答案

使用提示HINT_FORCE_PARTIAL_LOAD避免延迟加载。

Use hint HINT_FORCE_PARTIAL_LOAD to avoid lazy-loading.

...
$qb->getQuery()->setHint(Query::HINT_FORCE_PARTIAL_LOAD, true);

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