将带有子查询的 SQL 转换为 Doctrine Query Builder

Question

我有以下数据库结构：


List item

trips (ManyToMany to tags over table trips_tags)
+----+----------------+
| id |      name      |
+----+----------------+
|  1 | Czech Republic |
|  2 | Germany        |
|  3 | Poland         |
+----+----------------+

tags
+----+-----------+
| id |   name    |
+----+-----------+
|  1 | Mountains |
|  2 | Beach     |
|  3 | City      |
+----+-----------+

trips_tags
+----------+---------+
| trips_id | tags_id |
+----------+---------+
|        1 |       1 |
|        1 |       2 |
|        3 |       1 |
+----------+---------+

我需要 select 行程，其中包含我指定的所有标签。

需要将山脉标记为海滩的旅行我只得到捷克共和国。
只需要为标记山脉旅行，获得捷克共和国和波兰

我写了个简单的SQL

SELECT trip.name, trip.id
FROM trips AS trip
WHERE (
    SELECT COUNT(trip_tag.tags_id) 
    FROM trips_tags AS trip_tag 
    WHERE trip_tag.tags_id IN (1, 2) 
      AND trip_tag.trips_id = trip.id
) = numberOfTags`

现在我在用 DQL 编写 SQL 时遇到了问题。有人可以帮忙吗？

谢谢

Answer 1

看起来你在旅行和标签之间有多对多的关系，最好采用教义方式定义你的实体并将它们关联起来，就像

class Trip
{
    // ...

    /**
     * @ManyToMany(targetEntity="Tag", inversedBy="trips")
     * @JoinTable(name="trip_tag")
     */
    private $tags;

    public function __construct() {
        $this->tag s= new \Doctrine\Common\Collections\ArrayCollection();
    }

    // ...
}

/** @Entity */
class Tag
{
    // ...
    /**
     * @ManyToMany(targetEntity="Trip", mappedBy="tags")
     */
    private $trips;

    public function __construct() {
        $this->trips = new \Doctrine\Common\Collections\ArrayCollection();
    }

    // ...
}

然后通过一些聚合构建您的 DQL

$tagIds = [1,2];
$qb = $this->createQueryBuilder('trip');
$qb ->addSelect('COUNT(tags.id) AS total_tags')
    ->leftJoin('trip.tags', 'tags')
    ->add('where', $qb->expr()->in('tags', $tagIds))
    ->groupBy('trip.id')
    ->having('total_tags = @numberOfTags')
    ->getQuery()
    ->getResult();

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