如何防止在Symfony2中加载相关实体？ [英] How can I prevent loading of related entities in Symfony2?

问题描述

我有两个具有一对多关系的实体，Order和Orderline。我有一个清单，其中只需要来自订单的数据，但是Doctrine会查询每个订单的订单行。我没有加入查询中的订单行。

I have two entities, Order and Orderline with one-to-many relationship. I have a listing where I need only data from orders, but Doctrine makes query for orderlines for each order. I haven't joined Orderlines in the query. How can prevent Doctrine for querying the orderlines?

控制器中使用的查询：

$query = $em->createQuery("SELECT o FROM SomeBundle:Order o JOIN o.shop s JOIN s.user u WHERE u.id = :user_id AND o.status = :status")
    ->setParameter('user_id', $user->getId())
    ->setParameter('status', 'paid');
$orders = $query->getResult();

Order类中的一对多注释：

One-to-many annotation in Order class:

/**
 * @ORM\OneToMany(targetEntity="Orderline", mappedBy="order")
 */
protected $orderlines;

Orderline类中的多对一注释：

Many-to-one annotation in Orderline class:

/**
 * @ORM\ManyToOne(targetEntity="Order", inversedBy="orderlines")
 */
protected $order;

推荐答案

使用 Doctrine\ORM\Query :: HINT_FORCE_PARTIAL_LOAD

$query = $em->createQuery("SELECT partial o.{id} FROM SomeBundle:Order o JOIN o.shop s JOIN s.user u WHERE u.id = :user_id AND o.status = :status")
    ->setParameter('user_id', $user->getId())
    ->setParameter('status', 'paid');

$query->setHint(Doctrine\ORM\Query::HINT_FORCE_PARTIAL_LOAD, 1);

$orders = $query->getResult();

OR

查看此 http://docs.doctrine-project.org/en/2.1/ tutorials / extra-lazy-associations.html

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