Php 条令QueryBuilder：未捕获的异常

当我执行$qb->getQuery->getResult时， 我得到这个错误：

致命错误：未捕获异常“条令\ORM\Query\QueryException”，在/var/www/darkprog/application/libraries/Doctrine/ORM/Query/QueryException.php:39Stack trace:

0/var/www/darkprog/application/libraries/Doctrine/ORM/Query/Parser.php429:Doctrine\ORM\Query\QueryException:：dqlError'SELECT countu….'

1/var/www/darkprog/application/libraries/Doctrine/ORM/Query/Parser.php854:Doctrine\ORM\Query\Parser->语义错误'Class'User'is…'，数组

2/var/www/darkprog/application/libraries/Doctrine/ORM/Query/Parser.php1529:Doctrine\ORM\Query\Parser->AbstractSchemaName

3/var/www/darkprog/application/libraries/Doctrine/ORM/Query/Parser.php1426:Doctrine\ORM\Query\Parser->RangeVariableDeclaration

4/var/www/darkprog/application/libraries/Doctrine/ORM/Query/Parser.php1168:Doctrine\ORM\Query\Parser->IdentificationVariableDeclaration

5/var/www/darkfrog/application/libraries/Doctrine/ORM/Query/Parser.php757:Doctrine\ORM\Query\Pars位于第49行的/var/www/darkfrog/application/libraries/Doctrine/ORM/Query/QueryException.php中

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下面的代码非常有用，只需在from子句中添加Entities\即可

$qb->$this->doctrine->em->createQueryBuilder()
    ->select($qb->expr()->count('u.name'))
    ->from('User','u')
    ->where('u.name = :name')
    ->setParameter('name', $user->getUsername());

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您可以使用User:：class来定义实体名称

$qb = $this->doctrine->em->createQueryBuilder()
            ->select($this->doctrine->em->createQueryBuilder()->expr()->count('u.username'))
            ->from('Entities\User','u')
            ->where('u.username = :username')
            ->setParameter('username', $user->getUsername());
var_dump($qb->getQuery()->getResult()); 

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谢谢你的帮助，但是我的代码也有同样的错误。如果你用$qb->getDql而不是getQuery来调试怎么办？我有下一个查询：从用户u中选择COUNTu.name，其中u.name=：name查询看起来不错，我想可能是其他原因。此输出是否为真var_dumpis_string$user->getUsername？$user->getUsername是字符串。我已经使用反向工程从现有数据库生成了映射和实体。生成的文件可能是错误的。

$qb = $this->doctrine->em->createQueryBuilder()
            ->select($this->doctrine->em->createQueryBuilder()->expr()->count('u.username'))
            ->from('Entities\User','u')
            ->where('u.username = :username')
            ->setParameter('username', $user->getUsername());
var_dump($qb->getQuery()->getResult()); 

$qb = $this->doctrine->em->createQueryBuilder()                
            ->from(User::class,'u')
            ->select('count(u.name)')
            ->where('u.name = :name')
            ->setParameter('name', $user->getUsername());