Symfony 语义错误-原则2.0

这些是我的桌子：

    Table Gift:
        -id 
        -price
        ... 

我已经编写了一个sql查询来获取特定夫妇的所有礼物信息

或

     SELECT g.id , g.price,
    FROM gift g, registry reg       
    WHERE reg.gift_id = g.id AND reg.couple_id = 1 

我还想获得已购买礼物的总金额（如果有）
除总额（购买金额）作为总贡献

我试过：

    $qb = $this->createQueryBuilder('g')
    ->from('\BBB\GiftBundle\Entity\Purchase', 'p')
    ->from('\BBB\GiftBundle\Entity\Registry', 'reg')
    ->select('g.id ,  g.price')
    ->addSelect('SUM(p.amount) as totalContribute')
    ->leftJoin('p','pp', 'ON','reg.id = pp.registry')
    ->where('reg.gift = g.id')
    ->andWhere('reg.couple = :coupleID')
    ->orderBy('reg.id','DESC')
    ->setParameter('coupleID', $coupleID);

但它给了我以下错误：

    [Semantical Error] line 0, col 145 near 'pp ON reg.id': Error: Identification Variable p used in join path expression but was not defined before.

---

首先，应该在联接后的SQL语句中定义联接条件，而不是在WHERE子句中。原因是它真的没有效率。因此，查询应该如下所示：

 SELECT g.id , g.price,
 FROM gift g JOIN registry reg ON reg.gift_id = g.id
 WHERE reg.couple_id = 1 

但关于您的条令查询，您会遇到错误，因为您以错误的方式定义联接。您的查询应该更像：

 $qb = $this->createQueryBuilder('g') // You don't have put "from" beacuse I assume you put this into GiftRepository and then Doctrine knows that should be \BBB\GiftBundle\Entity\Gift
    ->select('g.id ,  g.price')
    ->addSelect('SUM(p.amount) as totalContribute')
    ->join('g.purchase','p')          // pay attention for this line: you specify relation basing on entity property - I assume that is "$purchase" for this example        
    ->leftJoin('p.registry', 'reg')   // here you join with \BBB\GiftBundle\Entity\Purchase
    ->where('reg.couple = :coupleID')
    ->orderBy('reg.id','DESC')
    ->setParameter('coupleID', $coupleID);

请将其视为伪代码-我没有检查它是否有效，但它应该更像这样

还有一件事-如果您的存储库方法返回X实体的对象，您应该将此方法放入XRepository

    $qb = $this->createQueryBuilder('g')
    ->from('\BBB\GiftBundle\Entity\Purchase', 'p')
    ->from('\BBB\GiftBundle\Entity\Registry', 'reg')
    ->select('g.id ,  g.price')
    ->addSelect('SUM(p.amount) as totalContribute')
    ->leftJoin('p','pp', 'ON','reg.id = pp.registry')
    ->where('reg.gift = g.id')
    ->andWhere('reg.couple = :coupleID')
    ->orderBy('reg.id','DESC')
    ->setParameter('coupleID', $coupleID);

    [Semantical Error] line 0, col 145 near 'pp ON reg.id': Error: Identification Variable p used in join path expression but was not defined before.

 SELECT g.id , g.price,
 FROM gift g JOIN registry reg ON reg.gift_id = g.id
 WHERE reg.couple_id = 1 

 $qb = $this->createQueryBuilder('g') // You don't have put "from" beacuse I assume you put this into GiftRepository and then Doctrine knows that should be \BBB\GiftBundle\Entity\Gift
    ->select('g.id ,  g.price')
    ->addSelect('SUM(p.amount) as totalContribute')
    ->join('g.purchase','p')          // pay attention for this line: you specify relation basing on entity property - I assume that is "$purchase" for this example        
    ->leftJoin('p.registry', 'reg')   // here you join with \BBB\GiftBundle\Entity\Purchase
    ->where('reg.couple = :coupleID')
    ->orderBy('reg.id','DESC')
    ->setParameter('coupleID', $coupleID);