Question

我有一些非常基本的实体，包含故事和标签，我试图尽可能高效地加载它们。

当我查询这样的故事时：

SELECT a FROM Foo\Article a WHERE a.id IN (1,2,3,4,5)

我看到正在运行以下SQL查询：

SELECT f0_.id AS id_0, f0_.title AS title_1 FROM foo_article f0_ WHERE f0_.id IN (1, 2, 3)
SELECT t0.name AS name_1, t0.article_id AS article_id_2 FROM foo_tag t0 WHERE t0.article_id = 1
SELECT t0.name AS name_1, t0.article_id AS article_id_2 FROM foo_tag t0 WHERE t0.article_id = 2
SELECT t0.name AS name_1, t0.article_id AS article_id_2 FROM foo_tag t0 WHERE t0.article_id = 3

我希望看到这一点：

SELECT f0_.id AS id_0, f0_.title AS title_1 FROM foo_article f0_ WHERE f0_.id IN (1, 2, 3)
SELECT t0.name AS name_1, t0.article_id AS article_id_2 FROM foo_tag t0 WHERE t0.article_id IN (1, 2, 3);

源代码看起来像这样。缩写为实际代码。

<?php
namespace Foo;

use Doctrine\ORM\Mapping as ORM;

/**
 * Class Tag
 *
 * @ORM\Entity()
 * @ORM\Table(name="foo_tag")
 *
 * @package Foo
 */
class Tag {

    /**
     * @ORM\Column(type="string")
     * @ORM\Id()
     */
    protected $name;

    /**
     * @ORM\ManyToOne(targetEntity="\Foo\Article",cascade={"persist"},fetch="LAZY",inversedBy="tags")
     * @ORM\Id()
     */
    protected $article;
}

/**
 * Class Article
 *
 * @ORM\Entity()
 * @ORM\Table(name="foo_article")
 *
 * @package Foo
 */
class Article {

    /**
     * @ORM\Id @ORM\Column(type="integer", name="id") @ORM\GeneratedValue
     */
    protected $id;

    /**
     * @ORM\Column(type="string")
     */
    protected $title;

    /**
     * @ORM\OneToMany(targetEntity="\Foo\Tag",mappedBy="article",cascade={"persist"},fetch="EAGER")
     */
    protected $tags;

}

Answer 1

我自己考虑的一种可能的方法是在我的存储库类中添加这样的东西。但它还没有感觉到它是对的。我想要一些对其他关联更容易移植的东西，每次查询实体时都可以工作，并且还可以使用分页查询。

也许是类似postLoad的事件，它涵盖了整个结果集（而不是每个实体的postLoad）。

$qb = $entityManager->getRepository('Foo\Article')->createQueryBuilder('a')
    ->where('a.id IN (1,2,3)');

$list = $qb->getQuery()->execute();

/** @var Foo\Article[] $indexed */
$indexed = array_reduce($list, function($result, \Foo\Article $article) {
    $result[$article->getId()] = $article;
    return $result;
}, Array());

$tags = $entityManager->getRepository('Foo\Tag')->createQueryBuilder('t')
    ->where('t.article IN (:ids)')
    ->setParameter('ids', $indexed)
    ->getQuery()->execute();

array_map(function(\Foo\Tag $tag) use ($indexed) {

    /** @var \Doctrine\ORM\PersistentCollection $collection */
    $collection = $tag->getArticle()->getTags();
    $collection->add($tag);
    $collection->setInitialized(true);

}, $tags);

foreach($indexed as $article) {
    $article->getTags()->takeSnapshot();
    $article->getTags()->setInitialized(true);
}

/** @var Foo\Article $article */
// and now use the Articles and Tags, to make sure that everything is loaded
foreach($list as $article) {
    $tags = $article->getTags();
    print " - ".$article->getTitle()."\n";
    foreach($tags as $tag) {
        print "   - ".$tag."\n";
    }
}

如何在Doctrine2中的单个查询中加载结果集的所有关联

1 个答案: