未定义的偏移量：0。学说和本土 sql

Question

我有一点问题，我想打印用户的 id，但是我有一个错误："Undefined offest: 0"。这是我的代码：

$rsm = new ResultSetMapping();
$em = $this->getDoctrine()->getManager(); 
$user= $this->get('security.context')->getToken()->getUser();
$query = $em->createNativeQuery('SELECT id FROM fos_user WHERE username_canonical = ?', $rsm);
$query->setParameter(1, $user);
$users = $query->getResult();
echo $users[0]['id'];

有人知道哪里出了问题吗？

Answer 1

更改字符串：

$query->setParameter(1, $user);

至

$query->setParameter(1, $user->getUsernameCanonical());

Answer 2

将EntityResult和FieldResult添加到$rsm

$rsm = new ResultSetMapping();
$rsm->addEntityResult('App\UserBundle\Entity\User', 'u');
$rsm->addFieldResult('u', 'id', 'id');

改变setParameter

$user 到 $user->getUsernameCanonical();

获取结果

foreach($users as $user)
{
    echo $user->getId();
}

未定义的偏移量：0。学说和本土 sql

Undefined offset: 0. Doctrine and native sql

symfony

doctrine-orm

fosuserbundle