Question

我想获得每个产品ID的最低出价。

return $this->getEntityManager()
        ->createQuery('
            SELECT PARTIAL b.{Id, MIN(amount) as amount, currency}, PARTIAL p.{id, firstName, lastName}
            FROM  AppBundle:Bid b
            LEFT JOIN b.provider p
            WHERE b.product in (:product)
            AND b.status = :status
            GROUP BY b.product
            ORDER BY b.amount'
        )
        ->setParameter('product', $ids)
        ->setParameter('status', 'active')
        ->getResult()
    ;

我收到以下错误

[语法错误]第0行，第42栏：错误：预期 Doctrine \ ORM \ Query \ Lexer :: T_CLOSE_CURLY_BRACE，得到'（'

我在SQL中运行完全相似的查询，它工作正常，但我不确定如何在doctrine查询构建器中实现相同。

Answer 1

如果你想用doctrine查询用户mysql函数你必须添加doctrine mysql函数的扩展名，或者你可以用户本机查询。我在后面添加了原生查询：

use Doctrine\ORM\Query\ResultSetMapping;


$rsm = new ResultSetMapping();
$rsm->addEntityResult('AppBundle:Bid', 'b');
$rsm->addFieldResult('b', 'Id', 'Id');
$rsm->addFieldResult('b', 'amount', 'amount');
$rsm->addFieldResult('b', 'currency', 'currency');
...
$sqlQuery = "SELECT b.Id, MIN(b.amount), b.currency, p.firstName, p.lastName
        FROM  AppBundle:Bid b
        LEFT JOIN b.AppBundle:Provider p
        WHERE b.AppBundle:Product in (:product)
        AND b.status = :status
        GROUP BY b.product
        ORDER BY b.amount";
$query = $em->createNativeQuery($sqlQuery, $rsm)
     ->setParameter('product', $ids)
     ->setParameter('status', 'active');
$query->getResult();

如果有任何问题，请告诉我

Answer 2

在DQL查询中使用PARTIAL关键字时，您只能列出所选实体的属性（MIN()函数不是您实体的属性）。您可以简单地省略PARTIAL部分并使用这样的查询（请注意，Doctrine不会返回结果集中的对象，只返回平面数组，另请参阅http://doctrine-orm.readthedocs.org/projects/doctrine-orm/en/latest/reference/dql-doctrine-query-language.html#partial-object-syntax）：

SELECT b.Id, MIN(b.amount) as amount, b.currency as bid, p.id, p.firstName, p.lastName as provider
FROM  AppBundle:Bid b
LEFT JOIN b.provider p
WHERE b.product in (:product) AND b.status = :status
GROUP BY b.product
ORDER BY b.amount

Symfony使用MIN功能的最低用户出价？

2 个答案: