Question

我知道how to set up a table prefix in symfony2，但现在我想对postgres序列做同样的事情。我怎样才能做到这一点？这甚至可能吗？

Answer 1

根据这里的答案：How to setup table prefix in symfony2

打开捆绑包的Resources / config / services.yml并添加：
```
parameters:
    mybundle.db.sequence_prefix: myprefix_
```

添加新服务：

services:
    mybundle.sqprefix_subscriber:
        class: MyBundle\Subscriber\SequencePrefixSubscriber
        arguments: [%mybundle.db.sequence_prefix%]
        tags:
            - { name: doctrine.event_subscriber }

创建MyBundle \ Subscriber \ SequencePrefixSubscriber.php

<?php
namespace MyBundle\Subscriber;

use Doctrine\ORM\Event\LoadClassMetadataEventArgs;

class SequencePrefixSubscriber implements \Doctrine\Common\EventSubscriber
{
    protected $prefix = '';

    public function __construct($prefix)
    {
        $this->prefix = (string) $prefix;
    }

    public function getSubscribedEvents()
    {
        return array('loadClassMetadata');
    }

    public function loadClassMetadata(LoadClassMetadataEventArgs $args)
    {
        $classMetadata = $args->getClassMetadata();
        if ($classMetadata->isInheritanceTypeSingleTable() && !$classMetadata->isRootEntity()) {
            return;
        }


        if ($classMetadata->isIdGeneratorSequence())
        {
            $newDefinition = $classMetadata->sequenceGeneratorDefinition;
            $newDefinition['sequenceName'] = $this->prefix . $newDefinition['sequenceName'];

            $classMetadata->setSequenceGeneratorDefinition($newDefinition);
            $em = $args->getEntityManager();
            if (isset($classMetadata->idGenerator)) {
                $sequenceGenerator = new \Doctrine\ORM\Id\SequenceGenerator(
                    $em->getConfiguration()->getQuoteStrategy()->getSequenceName(
                        $newDefinition,
                        $classMetadata,
                        $em->getConnection()->getDatabasePlatform()),
                    $newDefinition['allocationSize']
                );
                $classMetadata->setIdGenerator($sequenceGenerator);
            }
        }
    }
}

参考：http://www.doctrine-project.org/api/orm/2.0/class-Doctrine.ORM.Mapping.ClassMetadataInfo.html

文档说READ-ONLY属性sequenceGeneratorDefinition所以我认为使用setter比手动更改值更清晰（但是没有getter所以我们只使用公共属性值）。

如何为序列名称添加前缀？

1 个答案: