php - 如何在 2 个实体之间使用 QueryBuilder 在 Symfony Doctrine 中没有关系表的情况下加入

Question

我有一个与实体类别相关的实体视频，我需要使用 Doctrine QueryBuilder 运行此 SQL，这样我可以获得所有视频中最常用的类别 (1000+):

    SELECT c.*
    FROM Video v
    INNER JOIN video_category vc ON vc.video_id = v.id
    INNER JOIN Category c ON vc.category_id = c.id
    GROUP BY c.id
    HAVING COUNT(v.id) > 1000
    ORDER BY c.name ASC;

我的查询生成器:

    $queryBuilder = $this->getEntityManager()
        ->createQueryBuilder()
        ->select('c')
        ->from('AcmeVideoBundle:Video', 'v')
        // Can Doctrine join itself silently with relational info in the Entities?
        ->join('AcmeCategoryBundle:Category', 'c', Expr\Join::WITH, 'v.id = c.id')
        ->groupBy('c.id')
        ->having('COUNT(v.id) > 1000')
        ->orderBy('c.name', 'ASC')
        ->getQuery();

但是queryBuilder输出的SQL查询是这样的:

    SELECT c0_.id AS id0, c0_.NAME AS name1 
    FROM Video v1_ 
    INNER JOIN Category c0_ ON (v1_.id = c0_.id) 
    GROUP BY c0_.id 
    HAVING COUNT(v1_.id) > 1000
    ORDER BY c0_.NAME ASC

没有关系表(video_category)

实体映射:

    /**
     * Video
     *
     * @ORM\Table
     * @ORM\Entity(repositoryClass="Acme\VideoBundle\Entity\VideoRepository")
     */
    class Video
    {
        /**
         * @ORM\Id
         * @ORM\Column(type="integer")
         * @ORM\GeneratedValue(strategy="AUTO")
         */
        private $id;

        /**
         * @ORM\ManyToMany(targetEntity="Acme\CategoryBundle\Entity\Category", cascade={"persist"})
         */
        private $category;

        // More fields, getters and setters etc...
    }

    /**
     * Category
     *
     * @ORM\Table
     * @ORM\Entity(repositoryClass="Acme\CategoryBundle\Entity\CategoryRepository")
     */
    class Category
    {
        /**
         * @ORM\Id
         * @ORM\Column(type="integer")
         * @ORM\GeneratedValue(strategy="AUTO")
         */
        private $id;

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

        // More fields, getters and setters etc...
    }

如何使用关系表通过 doctrine Querybuilder 运行原始 SQL 查询？我错过了什么？

信息:当我在所有实体上 findBy{field}、persist、flush、clear 时工作正常，Doctrine 关系正常，我有 Video、Category 和 video_category 表正常，原始 SQL 查询工作完美。

Answer 1

   // Can Doctrine join itself silently with relational info in the Entities?
    ->join('AcmeCategoryBundle:Category', 'c', Expr\Join::WITH, 'v.id = c.id')

是的!事实上，这是使用 ORM(例如 Doctrine 2)的主要原因之一。

尝试:

->leftJoin('v.category','c')

虽然奇怪的是似乎没有连接示例，但该手册有更多详细信息。因此，常见的混淆。

http://docs.doctrine-project.org/en/latest/reference/query-builder.html

您可能还没有意识到，联合国已经通过了一项决议，禁止对别名使用缩写。为了安全起见，请尝试:

$queryBuilder = $this->getEntityManager()
    ->createQueryBuilder()
    ->addSelect('category')
    ->from('AcmeVideoBundle:Video', 'video')
    ->leftJoin('video.category', 'category')
    ->groupBy('category.id')
    ->having('COUNT(video.id) > 1000')
    ->orderBy('category.name', 'ASC')
    ->getQuery();