这里的诀窍是使用 INDEX BY 字。

导入Query类（不总是可选）：

import the Query class (no always optional):

use \Doctrine\ORM\Query;

创建查询：

$query = $this->data->em->createQuery('
    SELECT s 
    FROM models\Setting s 
    INDEX BY s.arg //to set array custom key
    WHERE s.category = :category');
$query->setParameter('category', 'general');

设置隐藏模式以使用只读数组

set the hidration mode in order to work with read-only arrays

$settings = $query->getResult(Query::HYDRATE_ARRAY); 

显示值：

echo $settings['desc']['value'];  // prints "bar"

QueryBuilder

使用 QueryBuilder 对象，您可以从语句中的设置索引：

QueryBuilder

With the QueryBuilder object you can set the index at the from statement:

$qb = $em->createQueryBuilder();
$qb->select('s');
$qb->from('models\Settings', 's', 's.arg');  // here the magic
$result = $qb->getQuery()->getResult();

然后，您可以访问该对象：

Then, you can access the object as:

$description = $result['desc'];
$value = $description->getValue();