啟用事務用法1：

from django.db import transaction
from rest_framework.views import APIView

class OrderAPIView(APIView):
    @transaction.atomic  # 開啟事務，當方法執行完以後，自動提交事務
    def post(self, request):
        pass    

啟用事務用法2：

from django.db import transaction
from rest_framework.views import APIView

class OrderAPIView(APIView):
    def post(self, request):
        with transaction.atomic(): # 開啟事務，當with語句執行完成以後，自動提交事務
            pass # 資料庫操作
 

from django.db import transaction
from rest_framework.views import APIView

class OrderAPIView(APIView):
    def post(self, request):
        with transaction.atomic():
            # 設定事務回滾的標記點
            sid = transation.savepoint()
            ...
            
            try:
               	...
            except:
                transation.savepoint_rallback(sid)