Question

我有单表继承的跟随类：

/**
* @ORM\Entity
* @ORM\Entity(repositoryClass="MyProject\MyBundle\Repository\ParameterRepository")
* @ORM\InheritanceType("SINGLE_TABLE")
* @ORM\DiscriminatorColumn(name="discr", type="string")
* @ORM\DiscriminatorMap({"MidUpperArmCircumference" = "MyProject\MyBundle\Entity\MidUpperArmCircumference", "parameter" = "Parameter"})
*/
class Parameter{
...
}

我试图获取MidUpperCircumference的实例：

...
$repository = $this->getDoctrine()->getRepository('MyprojectMyBundle:Parameter');
$discr = 'MyProject\MyBundle\Entity\MidUpperArmCircumference';
$midUpper = $repository->findOneByDiscr($discr);

我也有这个：

//MyProject\MyBundle\Repository\ParameterRepository

...
public function findOneByDiscr($discr)
{

    $query = $this->getEntityManager()
    ->createQuery(
            'SELECT u FROM MyProjectMyBundle:Parameter u 
            WHERE u INSTANCE OF :entity ')
            ->setParameter('entity', $discr);


    try {
        return $query->getSingleResult();
    } catch (\Doctrine\ORM\NoResultException $e) {
        return null;
    }

}

我收到了这个错误：

警告：get_class（）期望参数1为对象，字符串在D：\ workspace \ Project \ Symfony2 \ vendor \ doctrine \ lib \ Doctrine \ ORM \ Query \ SqlWalker.php第1727行中给出

Answer 1

要获取 MidUpperCircumference 对象的实例，您需要：

<?php
use MyProject\MyBundle\Entity\MidUpperArmCircumference

...
$repository = $this->getDoctrine()->getRepository('MyprojectMyBundle:Parameter');
$discr = new MidUpperCircumference();
$midUpper = $repository->findOneByDiscr($discr);
...

Answer 2

您也可以尝试设置参数（实体）的数据类型，如下所示：

    ->setParameter('entity', $discr, \Doctrine\DBAL\Types\Type::OBJECT);

Symfony2 Doctrine：设置参数以获取带有clausule实例的查询

2 个答案: