Question

我在本机MySQL代码中有这个查询

SELECT *
FROM `turn`
LEFT JOIN (
    poi
) ON ( turn.id = poi.turn_id )
GROUP BY turn.id
ORDER BY count( case when poi.image = 1 then 1 else null end) DESC;

我需要在Doctrine 2 DQL中重建它

到目前为止，我的尝试是：

SELECT t, COUNT((CASE WHEN Bundle\Entity\Poi p.image = 1 then 1 ELSE NULL END)) AS num
FROM Bundle\Entity\Turn t
JOIN t.pois p
GROUP BY t.id
ORDER BY num DESC

我得到了这个错误：

An exception has been thrown during the rendering of a template ("[Syntax Error] line 0, col 99: Error: Expected end of string, got '.'") in Bundle:Admin:showTurnsFiltered.html.twig at line 75.

我做错了什么？

Answer 1

我经过几个小时的尝试和搜索后发现它，它正在使用这个DQL：

$dql = 'SELECT t, SUM(CASE WHEN p.image = 1 THEN 1 ELSE 0 END) AS numImage
                    FROM Bundle\Entity\Turn t
                    JOIN t.pois p
                    GROUP BY t.id
                    ORDER BY numImage DESC;

重要的是，您需要使用SUM而不是COUNT

Answer 2

您需要使用ResultSetMappingBuilder。它看起来像是：

public function getTurn()
{
    $rsm = new ResultSetMappingBuilder($this->_em);

    $rsm->addRootEntityFromClassMetadata('Foo\BarBundle\Entity\Turn', 't');
    $rsm->addJoinedEntityFromClassMetadata('Foo\BarBundle\Entity\Poi', 'p', 't', 'poi', array('id' => 'poi_id'));       
    $rsm->addScalarResult('ImageCount', 'ImageCount');


    $sql = 'SELECT t.id, t.foo, t.bar,
            SUM(CASE WHEN p.image = 1 then 1 else null end) ImageCount,                
            FROM Turn t   
            INNER JOIN poi p ON t.id = p.turn_id                
            ORDER BY ImageCount DESC';
    $query = $this->_em->createNativeQuery($sql, $rsm);

    return $query->getScalarResult();
}

注意：您可能需要将$query->getScalarResult()更改为$query->getResult()。

在Count中的Doctrine 2 DQL案例

2 个答案: