Doctrine orm 在中使用Querybuilder删除条令

但我犯了个错误

    $qb = $this->getDoctrine ()->getEntityManager()->createQueryBuilder();
    $qb->delete('MainBundle:StatisticUser', 'u');
    $qb->where($qb->expr()->in('sessionid', array_keys($sessionidsToTruncate)));
    var_dump($qb->getQuery());
    $qb->getQuery()->execute();

private '_dql' => string 'DELETE MainBundle:StatisticUser u WHERE sessionid IN('asdfghjkl')' (length=75)

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有人能告诉我这个问题吗？

好的，我通过反复试验找到了解决方案：

[Semantical Error] line 0, col 50 near 'sessionid IN': Error: 'sessionid' is not defined. 

$qb->andWhere($qb->expr()->in('u.sessionid', array_keys($sessionidsToTruncate)));