我正在尝试使用 Doctrine 2 ORM 设置类继承，但出现错误(即使在遵循他们的示例时)。我正在使用 Symfony 2 沙箱中的控制台。这个简单的例子使用了类Person 和Employee； Employee 扩展Person。

我在尝试生成实体时遇到的错误是:

[Doctrine\ORM\Mapping\MappingException]

Entity class 'Employee' used in the discriminator map of class 'Application\MyBundle\Entity\Person' does not exist.

The XML being tried is below:

Person

<?xml version="1.0" encoding="utf-8"?>
<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
                  xsi="http://www.w3.org/2001/XMLSchema-instance"
                  schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">

<entity name="Application\MyBundle\Entity\Person" inheritance-type="SINGLE_TABLE">
    <change-tracking-policy>DEFERRED_IMPLICIT</change-tracking-policy>
    <id name="id" type="integer" column="id">
        <generator strategy="AUTO"/>
    </id>

    <discriminator-column name="discr" type="string" />

    <discriminator-map>
        <discriminator-mapping value="employee" class="Employee" />
    </discriminator-map>

    <lifecycle-callbacks/>
</entity>

</doctrine-mapping>

员工

<?xml version="1.0" encoding="utf-8"?>
<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
                  xsi="http://www.w3.org/2001/XMLSchema-instance"
                  schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">

<entity name="Application\MyBundle\Entity\Employee">
    <change-tracking-policy>DEFERRED_IMPLICIT</change-tracking-policy>
    <id name="id" type="integer" column="id">
        <generator strategy="AUTO"/>
    </id>
    <lifecycle-callbacks/>
</entity>

</doctrine-mapping>

似乎没有多少人使用 XML 来配置他们的 Doctrine 实体(大多数示例都使用 PHP 注释)，但对我来说这似乎是最合乎逻辑的，所以我想知道如何正确地做到这一点。有没有其他人遇到过这个问题，或者知道解决方案？

完整的异常轨迹如下:

Exception trace:
 () at C:\SVN\Symfony\symfony-sandbox\src\vendor\doctrine\lib\Doctrine\ORM\Mappi
ng\MappingException.php:187
 Doctrine\ORM\Mapping\MappingException::invalidClassInDiscriminatorMap() at C:\S
VN\Symfony\symfony-sandbox\src\vendor\doctrine\lib\Doctrine\ORM\Mapping\ClassMet
adataInfo.php:1465
 Doctrine\ORM\Mapping\ClassMetadataInfo->setDiscriminatorMap() at C:\SVN\Symfony
\symfony-sandbox\src\vendor\doctrine\lib\Doctrine\ORM\Mapping\Driver\XmlDriver.p
hp:98
 Doctrine\ORM\Mapping\Driver\XmlDriver->loadMetadataForClass() at C:\SVN\Symfony
\symfony-sandbox\src\vendor\doctrine\lib\Doctrine\ORM\Mapping\Driver\DriverChain
.php:75
 Doctrine\ORM\Mapping\Driver\DriverChain->loadMetadataForClass() at C:\SVN\Symfo
ny\symfony-sandbox\src\vendor\doctrine\lib\Doctrine\ORM\Mapping\ClassMetadataFac
tory.php:280
 Doctrine\ORM\Mapping\ClassMetadataFactory->loadMetadata() at C:\SVN\Symfony\sym
fony-sandbox\src\vendor\doctrine\lib\Doctrine\ORM\Mapping\ClassMetadataFactory.p
hp:178
 Doctrine\ORM\Mapping\ClassMetadataFactory->getMetadataFor() at C:\SVN\Symfony\s
ymfony-sandbox\src\vendor\doctrine\lib\Doctrine\ORM\Mapping\ClassMetadataFactory
.php:125
 Doctrine\ORM\Mapping\ClassMetadataFactory->getAllMetadata() at C:\SVN\Symfony\s
ymfony-sandbox\src\vendor\symfony\src\Symfony\Bundle\DoctrineBundle\Command\Doct
rineCommand.php:143
 Symfony\Bundle\DoctrineBundle\Command\DoctrineCommand->getBundleMetadatas() at
C:\SVN\Symfony\symfony-sandbox\src\vendor\symfony\src\Symfony\Bundle\DoctrineBun
dle\Command\GenerateEntitiesDoctrineCommand.php:77
 Symfony\Bundle\DoctrineBundle\Command\GenerateEntitiesDoctrineCommand->execute(
) at C:\SVN\Symfony\symfony-sandbox\src\vendor\symfony\src\Symfony\Component\Con
sole\Command\Command.php:150
 Symfony\Component\Console\Command\Command->run() at C:\SVN\Symfony\symfony-sand
box\src\vendor\symfony\src\Symfony\Component\Console\Application.php:184
 Symfony\Component\Console\Application->doRun() at C:\SVN\Symfony\symfony-sandbo
x\src\vendor\symfony\src\Symfony\Bundle\FrameworkBundle\Console\Application.php:
74
 Symfony\Bundle\FrameworkBundle\Console\Application->doRun() at C:\SVN\Symfony\s
ymfony-sandbox\src\vendor\symfony\src\Symfony\Component\Console\Application.php:
113
 Symfony\Component\Console\Application->run() at C:\SVN\Symfony\symfony-sandbox\
app\console:11

最佳答案

我遇到了同样的错误。

我想出了要做什么:

在您的示例中，您必须已生成“员工”实体。

1. 删除Person中的继承并在Employee中添加一个id
2. 原则:生成:实体
3. 在开始时定义 xml
4. 原则:生成:实体

为我工作。

关于xml - XML 中的 Doctrine 类继承，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/3933295/