postgresql - 如何为序列名称添加前缀？

Question

我知道如何在 symfony2 中设置表前缀，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

基于此处的答案：如何在 symfony2 中设置表前缀

1. 打开你的包的 Resources/config/services.yml 并添加：

   parameters:
       mybundle.db.sequence_prefix: myprefix_
   

2. 添加新服务：

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

3. 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

文档说明READ-ONLY了sequenceGeneratorDefinition属性，所以我认为使用 setter 比手动更改值更干净（但没有 getter，所以我们只使用公共属性值）。