Question

我已经完成了以下doctrine2查询，它可以检索某个地理半径范围内的所有“标记”。

    $qb->select('marker')
        ->from('SndSpecialistLocator\Entity\Marker', 'marker')
        ->where('DISTANCE(marker.location, POINT_STR(:point)) < :distance')
        ->setParameter('point', $point)
        ->setParameter('distance', $radius);

现在我想按距离对它们进行排序。

    $qb->select('marker (DISTANCE(marker.location, POINT_STR(:point))) AS distance')
        ->from('SndSpecialistLocator\Entity\Marker', 'marker')
        ->where('DISTANCE(marker.location, POINT_STR(:point)) < :distance')
        ->setParameter('point', $point)
        ->orderBy('distance', 'DESC')
        ->setParameter('distance', $radius);

但不幸的是，这不起作用，我想知道这是否可能，因为距离不是我的实体的真实属性，而是计算出来的？

这里的诀窍是什么？

Answer 1

或者，尝试在调用select（）时使用HIDDEN：

$qb->select('m as marker, (DISTANCE(m.location, POINT_STR(:point))) as HIDDEN distance')
// note HIDDEN added here --->------->------->------->------->------->---^
    ->from('SndSpecialistLocator\Entity\Marker', 'm')
    ->where('DISTANCE(m.location, POINT_STR(:point)) < :distance')
    ->setParameter('point', $point)
    ->orderBy('distance', 'ASC')
    ->setParameter('distance', $radius)
    ->setMaxResults(5);

$query = $qb->getQuery();
$result = $query->execute();

将HIDDEN添加到SELECT子句会将其隐藏在结果中，但允许在orderby子句中使用它。然后，您的$ result应该包含您想要的对象，而不必执行额外的array_walk。

Answer 2

不幸的是，通过别名排序是不可能的。您可以做的*是在orderBy语句中手动重复该函数：

$qb->select('marker (DISTANCE(marker.location, POINT_STR(:point))) AS distance')
    ->from('SndSpecialistLocator\Entity\Marker', 'marker')
    ->where('DISTANCE(marker.location, POINT_STR(:point)) < :distance')
    ->setParameter('point', $point)
    ->orderBy('DISTANCE(marker.location, POINT_STR(:point))', 'DESC')
    ->setParameter('distance', $radius);

* 我们可能都会因为走出DRY神圣的道路而走向开发

Answer 3

找到了解决方案。

   $qb->select('m as marker, (DISTANCE(m.location, POINT_STR(:point))) as distance')
        ->from('SndSpecialistLocator\Entity\Marker', 'm')
        ->where('DISTANCE(m.location, POINT_STR(:point)) < :distance')
        ->setParameter('point', $point)
        ->orderBy('distance', 'ASC')
        ->setParameter('distance', $radius)
        ->setMaxResults(5);

    $query = $qb->getQuery();
    $result = $query->execute();

    /**
     * Convert the resulting associative array into one containing only the entity objects
     *
     * array (size=5)
     *   0 =>
     *     array (size=2)
     *       'marker' =>
     *         object(SndSpecialistLocator\Entity\Marker)[647]
     *           protected 'id' => int 43
     *           protected 'title' => string 'c5d07acdd47efbe38a6d0bf4ec64f333' (length=32)
     *           private 'location' =>
     *             object(SndSpecialistLocator\Orm\Point)[636]
     *                private 'lat' => float 52.2897
     *                private 'lng' => float 4.84268
     *       'distance' => string '0.0760756823433058' (length=18)
     *   1 => ...
     *
     * array (size=5)
     *   0 =>
     *     object(SndSpecialistLocator\Entity\Marker)[647]
     *       protected 'id' => int 43
     *       protected 'title' => string 'c5d07acdd47efbe38a6d0bf4ec64f333' (length=32)
     *       private 'location' =>
     *         object(SndSpecialistLocator\Orm\Point)[636]
     *           private 'lat' => float 52.2897
     *           private 'lng' => float 4.84268
     *   1 => ...
     *
     */
    array_walk($result, function (&$item, $key)
    {
        $item = $item['marker'];
    });

如何做Doctrine2计算字段排序

3 个答案: