使用DQL查询返回外键

Question

我有一个这样的InvoiceItem实体:

/**
 * @Entity
 */
class InvoiceItem
{
    [..]

    /**
     * @ManyToOne(targetEntity="Invoice", inversedBy="items")
     * @JoinColumn(name="invoice_id", referencedColumnName="id")
     * @var Invoice
     */
    private $invoice;

    /**
     * @Column(type="decimal", scale="10", precision="3")
     * @var float
     */
    private $qty;

    /**
     * @Column(name="unit_price", type="decimal", scale="10", precision="3")
     * @var float
     */
    private $unitPrice;

    [..]
}

我想返回一个数组,其中键将是发票的id,值是qty*unitPrice的总和.

我可以使用这样的DQL查询返回总和:

SELECT SUM(I.qty * I.unitPrice) AS amount FROM Entities\\InvoiceItem I 
WHERE I.invoice IN (..) GROUP BY I.invoice

结果 :

array(
    0 => array('amount' => '46.7'), 
    1 => array('amount' => '32.5')
)

但我不知道如何退回发票外键.我试过了

SELECT SUM(I.qty * I.unitPrice) AS amount, I.invoice 
FROM Entities\\InvoiceItem I 
WHERE I.invoice IN (..) GROUP BY I.invoice 

但它不起作用(错误:无效的PathExpression.必须是StateFieldPathExpression.)

如何退回发票ID？我想使用ID作为我的结果数组的键:

array(
    1005 => '46.7', 
    1250 => '32.5'
)

其中1005和1250是发票的ID.

更新2011-06-15

原生查询有效:

    $rsm = new \Doctrine\ORM\Query\ResultSetMapping();
    $rsm->addScalarResult('invoice_id', 'invoiceId');
    $rsm->addScalarResult('amount', 'amount');
    $q = $this->getEntityManager()->createNativeQuery(
        'SELECT invoice_id, SUM(qty * unit_price) AS amount FROM invoices_items'
            .' WHERE invoice_id IN ('.implode(',', $ids).') GROUP BY invoice_id',
        $rsm
    );
    $result = $q->getResult();

结果:

array(
  0 => 
    array(
      'invoiceId' => '1005',
      'amount' => '46.7'
    )
  1 => 
    array(
      'invoiceId' => '1250',
      'amount' => '32.5'
    )
)

但我需要根据发票ID制作一个循环索引.

Answer 1

您可以使用setHint()方法使外键与实体的其余值一起返回.您将该方法应用于查询(而不是querybuilder):

$q = $qb->getQuery();
$q->setHint(\Doctrine\ORM\Query::HINT_INCLUDE_META_COLUMNS, true);