做Python后端开发电商类项目绝对是最经典、最能锻炼架构能力的实战场景。不同于普通的管理系统电商项目对并发能力、数据一致性、查询效率、事务安全性要求极高。很多新手习惯用 Django 默认的 SQLite 做开发虽然搭建快但一旦涉及商品秒杀、订单创建、并发查询就会出现锁表、查询卡顿、事务失效等一系列问题。而在企业生产环境中电商后端基本都是Django DRF PostgreSQL的技术栈组合。PostgreSQL 相比 MySQL 在复杂查询、事务隔离、大数据量分页、JSON字段存储方面优势明显非常适合电商商品、订单、sku复杂业务场景。今天我就带大家从零搭建一套企业级高并发电商核心API包含商品模型设计、订单事务处理、DRF序列化与接口开发代码可直接用于二次开发。一、为什么电商项目优选 DRFPostgreSQL很多初学者疑惑电商项目为什么不选MySQL并不是MySQL不行而是中小型电商、复杂订单业务场景下PostgreSQL适配性更强。首先它完整支持事务、行级锁、高并发读写能有效避免订单超卖、重复下单问题其次原生支持JSON字段无需额外建表就能存储商品参数、规格属性极大简化数据表结构。搭配 Django REST Framework 开发接口自带序列化校验、权限控制、分页、限流功能不用重复造轮子。相比于原生DjangoDRF开发的接口更规范、兼容性更强完全适配前后端分离架构是目前企业电商后端主流技术选型。二、项目环境依赖安装本次实战基于Python3.9适配主流服务器环境核心依赖Django、DRF、PostgreSQL驱动大家直接复制安装即可pip install django4.2 pip install djangorestframework pip install psycopg2-binary # PostgreSQL数据库驱动安装完成后创建Django项目与app提前在本地或服务器搭建好PostgreSQL数据库创建对应的库名用于后续项目连接配置。三、数据库配置settings.py 核心配置首先修改项目数据库配置替换默认SQLite为PostgreSQL同时注册DRF应用和电商业务app这是保证项目正常运行的基础INSTALLED_APPS [ django.contrib.admin, django.contrib.auth, django.contrib.contenttypes, django.contrib.sessions, rest_framework, # 注册DRF框架 goods, # 商品模块 order # 订单模块 ] # PostgreSQL数据库配置 DATABASES { default: { ENGINE: django.db.backends.postgresql, NAME: ecommerce_db, USER: postgres, PASSWORD: 123456, HOST: 127.0.0.1, PORT: 5432 } } # 开启DRF分页、默认渲染器 REST_FRAMEWORK { DEFAULT_PAGINATION_CLASS: rest_framework.pagination.PageNumberPagination, PAGE_SIZE: 10 }四、核心模型设计商品订单电商系统的核心就是商品和订单模型我结合企业规范设计模型利用PostgreSQL优势使用JSONField存储商品规格同时订单加入事务保护字段避免并发异常# goods/models.py from django.db import models class Goods(models.Model): 商品模型 name models.CharField(max_length200, verbose_name商品名称) price models.DecimalField(max_digits10, decimal_places2, verbose_name商品价格) stock models.IntegerField(default0, verbose_name库存数量) # PG特色JSON字段存储规格、参数无需分表 specs models.JSONField(defaultdict, verbose_name商品规格) create_time models.DateTimeField(auto_now_addTrue) class Meta: verbose_name 商品表 db_table tb_goods# order/models.py from django.db import models from django.db import transaction from goods.models import Goods class Order(models.Model): 订单模型 ORDER_STATUS ( (1, 待支付), (2, 已支付), (3, 已取消), ) goods models.ForeignKey(Goods, on_deletemodels.CASCADE, verbose_name关联商品) order_sn models.CharField(max_length50, uniqueTrue, verbose_name订单编号) status models.IntegerField(choicesORDER_STATUS, default1, verbose_name订单状态) create_time models.DateTimeField(auto_now_addTrue) class Meta: verbose_name 订单表 db_table tb_order五、DRF序列化 高并发订单接口核心这里是整篇文章的重点电商订单最大的问题就是并发下单超卖、数据不一致。我在接口中加入数据库事务原子性操作结合行级锁彻底解决高并发场景下的库存错乱问题生产可直接复用# order/views.py from rest_framework.views import APIView from rest_framework.response import Response from django.db import transaction from .models import Order from goods.models import Goods import uuid class CreateOrderView(APIView): transaction.atomic() # 开启事务要么全部成功要么全部回滚 def post(self, request): goods_id request.data.get(goods_id) buy_num int(request.data.get(buy_num, 1)) # 行级锁select_for_update 防止并发超卖 goods Goods.objects.select_for_update().filter(idgoods_id).first() if not goods: return Response({code:400, msg:商品不存在}) if goods.stock buy_num: return Response({code:400, msg:库存不足下单失败}) # 扣减库存 goods.stock - buy_num goods.save() # 生成唯一订单号 order_sn str(uuid.uuid4()).replace(-,) Order.objects.create( goodsgoods, order_snorder_sn, status1 ) return Response({code:200, msg:下单成功, order_sn:order_sn})六、路由配置与项目启动配置完接口后注册路由执行数据库迁移命令即可正常调试所有电商接口# urls.py from django.contrib import admin from django.urls import path from order.views import CreateOrderView urlpatterns [ path(admin/, admin.site.urls), path(api/order/create/, CreateOrderView.as_view()), ]执行迁移命令python manage.py makemigrations python manage.py migrate python manage.py runserver七、高并发优化实战心得在实际电商项目开发中很多新手只写业务逻辑忽略并发防护线上极易出现超卖、重复订单问题。我总结两个核心优化点第一一定要用select_for_update()行锁锁住查询语句防止多请求同时读取库存导致超卖第二所有下单、退款、库存变动逻辑必须包裹在事务中保证数据一致性。另外PostgreSQL相比MySQL在高并发读写场景下锁冲突更少JSON字段存储商品规格无需频繁分表维护成本更低非常适合中小型电商项目快速迭代。后续还可以搭配Redis缓存热点商品、接口限流进一步提升服务并发能力。八、实战总结Django DRF PostgreSQL 是中小型电商后端性价比极高的技术方案。DRF规范了前后端交互接口简化了重复开发工作PostgreSQL凭借优秀的事务机制和灵活的数据类型完美适配电商商品、订单核心复杂业务。本文搭建的这套核心接口解决了电商最关键的并发下单、库存超卖、数据不一致问题代码规范、贴近企业生产标准大家可以在此基础上拓展支付、购物车、分页查询、权限校验等功能快速搭建完整电商后端项目。ShAre.rEaD.MnSte.CoM/Article/details/477719.sHtMLShAre.rEaD.MnSte.CoM/Article/details/747214.sHtMLShAre.rEaD.MnSte.CoM/Article/details/719136.sHtMLShAre.rEaD.MnSte.CoM/Article/details/610668.sHtMLShAre.rEaD.MnSte.CoM/Article/details/470321.sHtMLShAre.rEaD.MnSte.CoM/Article/details/046832.sHtMLShAre.rEaD.MnSte.CoM/Article/details/229871.sHtMLShAre.rEaD.MnSte.CoM/Article/details/638625.sHtMLShAre.rEaD.MnSte.CoM/Article/details/002631.sHtMLShAre.rEaD.MnSte.CoM/Article/details/808425.sHtMLShAre.rEaD.MnSte.CoM/Article/details/733773.sHtMLShAre.rEaD.MnSte.CoM/Article/details/652659.sHtMLShAre.rEaD.MnSte.CoM/Article/details/929734.sHtMLShAre.rEaD.MnSte.CoM/Article/details/840464.sHtMLShAre.rEaD.MnSte.CoM/Article/details/465540.sHtMLShAre.rEaD.MnSte.CoM/Article/details/979953.sHtMLShAre.rEaD.MnSte.CoM/Article/details/419439.sHtMLShAre.rEaD.MnSte.CoM/Article/details/676445.sHtMLShAre.rEaD.MnSte.CoM/Article/details/086754.sHtMLShAre.rEaD.MnSte.CoM/Article/details/027118.sHtMLShAre.rEaD.MnSte.CoM/Article/details/620506.sHtMLShAre.rEaD.MnSte.CoM/Article/details/967068.sHtMLShAre.rEaD.MnSte.CoM/Article/details/165867.sHtMLShAre.rEaD.MnSte.CoM/Article/details/756372.sHtMLShAre.rEaD.MnSte.CoM/Article/details/377227.sHtMLShAre.rEaD.MnSte.CoM/Article/details/183848.sHtMLShAre.rEaD.MnSte.CoM/Article/details/429868.sHtMLShAre.rEaD.MnSte.CoM/Article/details/259540.sHtMLShAre.rEaD.MnSte.CoM/Article/details/969482.sHtMLShAre.rEaD.MnSte.CoM/Article/details/900287.sHtMLShAre.rEaD.MnSte.CoM/Article/details/139698.sHtMLShAre.rEaD.MnSte.CoM/Article/details/358954.sHtMLShAre.rEaD.MnSte.CoM/Article/details/639868.sHtMLShAre.rEaD.MnSte.CoM/Article/details/070340.sHtMLShAre.rEaD.MnSte.CoM/Article/details/649036.sHtMLShAre.rEaD.MnSte.CoM/Article/details/819774.sHtMLShAre.rEaD.MnSte.CoM/Article/details/608029.sHtMLShAre.rEaD.MnSte.CoM/Article/details/096265.sHtMLShAre.rEaD.MnSte.CoM/Article/details/224199.sHtMLShAre.rEaD.MnSte.CoM/Article/details/496031.sHtMLShAre.rEaD.MnSte.CoM/Article/details/310432.sHtMLShAre.rEaD.MnSte.CoM/Article/details/857860.sHtMLShAre.rEaD.MnSte.CoM/Article/details/164190.sHtMLShAre.rEaD.MnSte.CoM/Article/details/116760.sHtMLShAre.rEaD.MnSte.CoM/Article/details/718368.sHtMLShAre.rEaD.MnSte.CoM/Article/details/585147.sHtMLShAre.rEaD.MnSte.CoM/Article/details/127091.sHtMLShAre.rEaD.MnSte.CoM/Article/details/560095.sHtMLShAre.rEaD.MnSte.CoM/Article/details/826763.sHtMLShAre.rEaD.MnSte.CoM/Article/details/865227.sHtMLShAre.rEaD.MnSte.CoM/Article/details/379767.sHtMLShAre.rEaD.MnSte.CoM/Article/details/727477.sHtMLShAre.rEaD.MnSte.CoM/Article/details/432048.sHtMLShAre.rEaD.MnSte.CoM/Article/details/851795.sHtMLShAre.rEaD.MnSte.CoM/Article/details/028252.sHtMLShAre.rEaD.MnSte.CoM/Article/details/002976.sHtMLShAre.rEaD.MnSte.CoM/Article/details/715054.sHtMLShAre.rEaD.MnSte.CoM/Article/details/885990.sHtMLShAre.rEaD.MnSte.CoM/Article/details/541079.sHtMLShAre.rEaD.MnSte.CoM/Article/details/522989.sHtMLShAre.rEaD.MnSte.CoM/Article/details/621850.sHtMLShAre.rEaD.MnSte.CoM/Article/details/984458.sHtMLShAre.rEaD.MnSte.CoM/Article/details/211757.sHtMLShAre.rEaD.MnSte.CoM/Article/details/225517.sHtMLShAre.rEaD.MnSte.CoM/Article/details/102622.sHtMLShAre.rEaD.MnSte.CoM/Article/details/984404.sHtMLShAre.rEaD.MnSte.CoM/Article/details/600901.sHtMLShAre.rEaD.MnSte.CoM/Article/details/230496.sHtMLShAre.rEaD.MnSte.CoM/Article/details/908351.sHtMLShAre.rEaD.MnSte.CoM/Article/details/129964.sHtMLShAre.rEaD.MnSte.CoM/Article/details/750590.sHtMLShAre.rEaD.MnSte.CoM/Article/details/309687.sHtMLShAre.rEaD.MnSte.CoM/Article/details/352274.sHtMLShAre.rEaD.MnSte.CoM/Article/details/871248.sHtMLShAre.rEaD.MnSte.CoM/Article/details/578544.sHtMLShAre.rEaD.MnSte.CoM/Article/details/131849.sHtMLShAre.rEaD.MnSte.CoM/Article/details/790422.sHtMLShAre.rEaD.MnSte.CoM/Article/details/138147.sHtMLShAre.rEaD.MnSte.CoM/Article/details/427050.sHtMLShAre.rEaD.MnSte.CoM/Article/details/860709.sHtMLShAre.rEaD.MnSte.CoM/Article/details/224079.sHtMLShAre.rEaD.MnSte.CoM/Article/details/535787.sHtMLShAre.rEaD.MnSte.CoM/Article/details/879678.sHtMLShAre.rEaD.MnSte.CoM/Article/details/939551.sHtMLShAre.rEaD.MnSte.CoM/Article/details/567932.sHtMLShAre.rEaD.MnSte.CoM/Article/details/386304.sHtMLShAre.rEaD.MnSte.CoM/Article/details/899029.sHtMLShAre.rEaD.MnSte.CoM/Article/details/425568.sHtMLShAre.rEaD.MnSte.CoM/Article/details/370560.sHtMLShAre.rEaD.MnSte.CoM/Article/details/905782.sHtMLShAre.rEaD.MnSte.CoM/Article/details/208846.sHtMLShAre.rEaD.MnSte.CoM/Article/details/002064.sHtMLShAre.rEaD.MnSte.CoM/Article/details/614287.sHtMLShAre.rEaD.MnSte.CoM/Article/details/482619.sHtMLShAre.rEaD.MnSte.CoM/Article/details/865579.sHtMLShAre.rEaD.MnSte.CoM/Article/details/206689.sHtMLShAre.rEaD.MnSte.CoM/Article/details/405112.sHtMLShAre.rEaD.MnSte.CoM/Article/details/653995.sHtMLShAre.rEaD.MnSte.Co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