我正在尝试使用Doctrine QueryBuilder来执行以下SQL查询：

DELETE php FROM product_hole_pattern php
INNER JOIN hole_pattern hp ON php.hole_pattern_id = hp.id
INNER JOIN hole_pattern_type hpt ON hp.hole_pattern_type_id = hpt.id
WHERE php.product_id = 4 AND hpt.slug='universal';

我有这个

$qb = $this->entityManager->createQueryBuilder();
$query = $qb->delete('\SANUS\Entity\ProductHolePattern', 'php')
  ->innerJoin('php.holePattern', 'hp')
  ->innerJoin('hp.holePatternType', 'hpt')
  ->where('hpt.slug = :slug AND php.product=:product')
  ->setParameter('slug','universal')
  ->setParameter('product',$this->id)
  ->getQuery();

但我得到：

[Semantical Error] line 0, col 50 near 'hpt.slug = :slug': Error: 'hpt' is not defined.

错误消息附带的DQL是：

DELETE \SANUS\Entity\ProductHolePattern php 
WHERE hpt.slug = :slug AND php.product=:product

因此，连接似乎完全被省略了。