php – 使用复合主键生成自动增量ID

我想给一个实体(发票,订单,预订等)一个唯一的序列号,但在那一年内只是唯一的.因此,每年(或其他字段,如客户)启动的第一张发票的ID为1.这意味着可以有复合主键(年份,ID)或一个主键(即invoice_id)和另外两个列.独特的.

我的问题：使用Doctrine2和Symfony2为对象提供自动生成的ID和其他值的唯一组合的最佳方法是什么？

复合键的学说限制

Doctrine无法为具有复合主键的实体分配自动生成的ID(http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/tutorials/composite-primary-keys.html)：

Every entity with a composite key cannot use an id generator other
than “ASSIGNED”. That means the ID fields have to have their values
set before you call EntityManager#persist($entity).

手动设置序列号

所以我必须手动分配ID.为了做到这一点,我试图在某一年寻找最高的ID并给出ID为1的新实体.我怀疑这是最好的方式,即使它是,我也没有找到最好的(DRY) )这样做的方式.由于我认为这是一个通用问题,我想阻止XY-problem,我已经开始提出这个问题了.

香草选择：仅限MyISAM

我找到了基于this answer的’vanilla’MySQL / MyISAM解决方案：

CREATE TABLE IF NOT EXISTS `invoice` (
  `year` int(1) NOT NULL,`id` mediumint(9) NOT NULL AUTO_INCREMENT,PRIMARY KEY (`year`,`id`)
) ENGINE=MyISAM;

由于Doctrine2的局限性,这是行不通的,所以我正在寻找一个类似于这个vanilla MySQL解决方案的Doctrine ORM.

其他方案

InnoDB也有一个解决方案：Defining Composite Key with Auto Increment in MySQL

一个天真的解决方案看起来像这样.

services.yml

services:
    invoice.listener:
        class: MyCompanyCompanyBundleEventListenerInvoiceListener
        tags :
            - { name: doctrine.event_subscriber,connection: default }

InvoiceListener.php

<?php

namespace MyCompanyCompanyBundleEventListener;

use SymfonyComponentEventDispatcherEventDispatcherInterface;
use DoctrineCommonEventSubscriber;
use DoctrineORMEventOnFlushEventArgs;
use DoctrineORMEventPostFlushEventArgs;

use MyCompanyCompanyBundleEntityInvoice;

class InvoiceListener implements EventSubscriber {

    protected $invoices;

    public function getSubscribedEvents() {
        return [
            'onFlush','postFlush'
        ];
    }

    public function onFlush(OnFlushEventArgs $event) {
        $this->invoices = [];
        /* @var $em DoctrineORMEntityManager */
        $em = $event->getEntityManager();
        /* @var $uow DoctrineORMUnitOfWork */
        $uow = $em->getUnitOfWork();

        foreach ($uow->getScheduledEntityInsertions() as $entity) {
            if ($entity instanceof Invoice) {
                $this->invoices[] = $entity;
            }
        }
    }

    public function postFlush(PostFlushEventArgs $event) {
        if (!empty($this->invoices)) {

            /* @var $em DoctrineORMEntityManager */
            $em = $event->getEntityManager();

            foreach ($this->invoices as $invoice) {
                // Get all invoices already in the database for the year in question
                $invoicesToDate = $em
                    ->getRepository('MyCompanyCompanyBundle:Invoice')
                    ->findBy(array(
                        'year' => $invoice->getYear()
                        // You could include e.g. clientID here if you wanted
                        // to generate a different sequence per client
                    );
                // Add your sequence number
                $invoice->setSequenceNum(count($invoicesToDate) + 1);

                /* @var $invoice MyCompanyCompanyBundleEntityInvoice */
                $em->persist($invoice);
            }

            $em->flush();
        }
    }
}

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