Question

我有这个实体：

/**
 * User state.
 *
 * @ORM\Entity(repositoryClass="User\Repository\StateRepository")
 * @ORM\Table(name="user_state")
 */
class State implements StateInterface
{
    /** ONE-TO-ONE BIDIRECTIONAL, OWNING SIDE
     * @var User
     * @ORM\Id
     * @ORM\OneToOne(targetEntity="User\Entity\User", inversedBy="state")
     * @ORM\JoinColumn(name="user_id", referencedColumnName="id")
     */
    protected $user;

    /** ONE-TO-ONE UNIDIRECTIONAL
     * @var \Application\Entity\State
     * @ORM\Id
     * @ORM\ManyToOne(targetEntity="Application\Entity\State", fetch="EAGER")
     * @ORM\JoinColumn(name="state_id", referencedColumnName="id")
     */
    protected $state;

    public function __construct(User $user, \Application\Entity\State $state)
    {
        $this->user = $user;
        $this->state = $state;
    }

    /********/
    /* USER */
    /********/
    /**
     * Get user
     *
     * @return User
     */
    public function getUser()
    {
        return $this->user;
    }

    /**
     * Set user
     *
     * @param User $user
     *
     * @return Email
     */
    public function setUser(User $user)
    {
        $this->user = $user;

        return $this;
    }

    /**********/
    /* STATUS */
    /**********/
    /**
     * Get state
     *
     * @return \Application\Entity\State
     */
    public function getState()
    {
        return $this->state;
    }

    /**
     * Set state
     *
     * @param \Application\Entity\State $state
     *
     * @return State
     */
    public function setState(\Application\Entity\State $state)
    {
        $this->state = $state;

        return $this;
    }

    /******/
    /* ID */
    /******/
    /**
     * Get id.
     *
     * @return int
     */
    public function getId()
    {
        return $this->state->getId();
    }

    /**
     * Set id.
     *
     * @param int $id
     *
     * @return State
     */
    public function setId($id)
    {
        $this->state->setId((int) $id);

        return $this;
    }

    /********/
    /* NAME */
    /********/
    /**
     * Get name
     *
     * @return string
     */
    public function getName()
    {
        return $this->state->getName();
    }

    /**
     * Set name
     *
     * @param string $name
     *
     * @return State
     */
    public function setName($name)
    {
        $this->state->setName((string) $name);

        return $this;
    }
}

要获取实体，我在自定义存储库中执行此操作

return self::findOneBy($params);

这导致此查询：

SELECT t0.user_id AS user_id1, t0.state_id AS state_id2, t3.id AS id4, t3.name AS name5 FROM user_state t0 LEFT JOIN state t3 ON t0.state_id = t3.id WHERE t0.user_id = ? LIMIT 1

完美！正是因为fetch="EAGER"关系，所以我急切地想要了解相关实体。现在我想用DQL实现相同的功能，所以我这样做：

$query = $this->_em->createQuery("SELECT us, s FROM 'User\Entity\State' us LEFT JOIN us.state s WHERE us.user = :user_id");
$query->setParameters($params);
$query->setFetchMode('User\Entity\State', 'state', ClassMetadata::FETCH_EAGER);
return $query->getOneOrNullResult();

我收到一条错误消息：Call to a member function getId() on a non-object 显然相关实体没有正确加载。当我手动检查时，$state原来是NULL

如果我在查询中省略s，就像这样：

$query = $this->_em->createQuery("SELECT us FROM 'User\Entity\State' us LEFT JOIN us.state s WHERE us.user = :user_id");

然后它按照我想要的方式返回结果，但它会产生两个查询（另一个查询来获取相关的状态实体），这显然是有意义的，因为查询不被视为fetch join任何更长，所以懒惰加载相关实体。

如何使用findOneBy方法获得相同的结果（一个查询，一个结果），而不是使用DQL？

Answer 1

我刚刚将Doctrine2 ORM更新为2.5版，现在它正在运行：）

我当前的composer.json文件中的Doctrine元素如下所示：

"doctrine/doctrine-module":"dev-master",
"doctrine/doctrine-orm-module": "dev-master",
"doctrine/dbal": "2.5.*@dev",
"doctrine/orm": "2.5.*@dev",

ZF2中的Doctrine2 - DQL给出了与findOneBy方法不同的结果

1 个答案: