Question

我有2个实体，ActivityType和ActivityNature，具有多对多单向关系，其中ActivityType是拥有实体：

<?php

namespace Evo\AppBundle\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;

/**
 * ActivityType
 *
 * @ORM\Table(name="sf_activity_types")
 * @ORM\Entity(repositoryClass="Evo\AppBundle\Entity\ActivityTypeRepository")
 */
class ActivityType
{
    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @ORM\ManyToMany(targetEntity="Evo\AppBundle\Entity\ActivityNature")
     * @ORM\JoinTable(name="sf_activity_types_natures")
     */
    protected $activityNatures;

    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255)
     */
    private $name;

namespace Evo\AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * ActivityNature
 *
 * @ORM\Table(name="sf_activity_natures")
 * @ORM\Entity(repositoryClass="Evo\AppBundle\Entity\ActivityNatureRepository")
 */
class ActivityNature implements \JsonSerializable
{
    /**
     * @var integer
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string
     *
     * @ORM\Column(name="name", type="string", length=255)
     */
    private $name;

我可以使用$ activityType-＆gt; getActivityNatures（）轻松获取与给定activityType相关的activityNatures; 但我无法找到有关如何从给定的activityNature获取activityTypes的任何线索。由于性能问题，我真的不想设置双向关系。任何帮助将不胜感激。

Answer 1

您可以使用以下dql：

"SELECT at FROM AcmeBundle:ActivityType at WHERE :natureId MEMEBR OF at.activityNatures"

编辑：回答您的评论，获取ActivityNature：

"SELECT an FROM AcmeBundle:ActivityType at JOIN at.activityNatures an WHERE at.id = :activitiTypeId"

以多对多单向关系获取逆实体

1 个答案: