Symfony 条令@InheritanceType（“JOINED”）错误使用语句

我试图在条令中使用继承类型，但在创建数据库时，它会显示以下错误消息：

[Doctrine\Common\Annotations\AnnotationException]
[Semantical Error] The annotation "@InheritanceType" in class iMed\GestInfo
rmatiqueBundle\Entity\MaterielInformatique was never imported. Did you mayb
e forget to add a "use" statement for this annotation?

父类是

namespace iMed\GestInformatiqueBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * MaterielInformatique
 *
 * @ORM\Table(name="MATERIEL_INFORMATIQUE")
 * @ORM\Entity
 * @InheritanceType("JOINED")
 * @DiscriminatorColumn(name="nature", type="string")
 * @DiscriminatorMap({"PCMP" = "PC", "IMPR" = "Imprimante", "ECRN" = "Ecran"})
 */
class MaterielInformatique
{
    /**
     * @var integer
     *
     * @ORM\Column(name="ID", type="integer", nullable=false)
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $id;
////
}

---

似乎我需要添加一行来导入一个类，但我不知道该类是什么，有人有办法解决这个问题吗？

您在

InheritanceType

命名空间中遗漏了

ORM

前缀，请尝试以下操作：

/**
 * MaterielInformatique
 *
 * @ORM\Table(name="MATERIEL_INFORMATIQUE")
 * @ORM\Entity
 * @ORM\InheritanceType("JOINED")
 * @ORM\DiscriminatorColumn(name="nature", type="string")
 * @ORM\DiscriminatorMap({"PCMP" = "PC", "IMPR" = "Imprimante", "ECRN" = "Ecran"})
 */
class MaterielInformatique