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我使用查询生成器得到了一个查询，并将其分配给$qb变量。它从PHP和数据库都可以正常工作。现在，我尝试使用查询作为子查询象下面这样：Symfony2原则查询生成器作为FROM子句中的子查询
$subQuery = $qb->getQuery()->getSql();
$query = 'select res.some_name
from ('.$subQuery.') as res';
，但我得到以下异常：
Caused by Doctrine\DBAL\Driver\PDOException: SQLSTATE[HY000]: General error: 1 no such column: res.some_name
正如主义已经转换$qb到这样的地方主义转换的原始SQL查询。例如，有被称为legalentity_name的东西，但它显示AS名1：
select res.some_name from (SELECT o0_.id AS id0, o0_.name AS name1, b1_.id AS id2, b1_.display AS display3, m2_.id AS id4, m2_.total AS total5 FROM Invoice i3_ INNER JOIN CodeableItem c4_ ON i3_.id = c4_.id INNER JOIN MonetaryItem m2_ ON i3_.id = m2_.id AND (1=1) INNER JOIN LineItem l5_ ON c4_.id = l5_.codeableItem_id LEFT JOIN MonetaryItem m6_ ON l5_.id = m6_.id AND (1=1) LEFT JOIN PresetLineItem p7_ ON c4_.id = p7_.codeableItem_id LEFT JOIN MonetaryItem m8_ ON p7_.id = m8_.id AND (1=1) INNER JOIN OrgUnit o0_ ON c4_.legalentity_id = o0_.id AND (1=1) INNER JOIN monetaryitem_listitem m9_ ON m2_.id = m9_.monetaryitem_id INNER JOIN BWListItem b1_ ON b1_.id = m9_.bwlistitem_id AND (1=1) INNER JOIN BWList b10_ ON b1_.bwlist_id = b10_.id AND (1=1) WHERE b10_.type = 'Vendor' GROUP BY c4_.legalentity_id, b1_.active, b1_.attributes, b1_.display, b1_.created, b1_.updated, b1_.lft, b1_.lvl, b1_.rgt, b1_.root, b1_.id, b1_.orgunit_id, b1_.bwlist_id, b1_.parent_id, b1_.rootou_id, m2_.created, m2_.updated, m2_.subtotal, m2_.total, m2_.description, m2_.id, c4_.number, c4_.externalId, c4_.status, c4_.overriddenDuringApproval, i3_.invoiceDate, i3_.dueDate, i3_.poNumber, m2_.rootou_id, c4_.image_id, c4_.legalentity_id, c4_.creator, c4_.owner_id ORDER BY o0_.name ASC, b1_.display ASC) as res
我的问题是：我怎么能使用来自$subQuery原始SQL？任何帮助将是非常有益的。干杯!