def example_view(request):
    with transaction.atomic():
        change_obj() # 修改對(duì)象變量
        obj.save()
        async_task.delay(obj.id)
def async_task(obj_id):
    obj = Model.objects.get(pk=obj_id)
    read_the_obj() # 讀取對(duì)象信息

def example_view(request):
    tag = False
    with transaction.atomic():
        tag = True
        change_obj() # 修改對(duì)象變量
        obj.save()
        raise DataError
    print("tag = ",tag)

tag = True #輸出內(nèi)容

def example_view(request):
    obj.changed = False
    with transaction.atomic():
        obj.changed = True
        change_obj() # 修改對(duì)象其他變量
        obj.save()
        raise DataError
    print("obj.changed = ",obj.changed)

obj.changed = True #輸出內(nèi)容

from django.shortcuts import render
from django.http import HttpResponse
from django.views.generic import View
from django.db import transaction   # 導(dǎo)入事務(wù) 
 
# 類視圖 (事務(wù),@transaction.atomic裝飾器)
class MyView(View): 
    @transaction.atomic
    # transaction.atomic裝飾器可以保證該函數(shù)中所有的數(shù)據(jù)庫操作都在一個(gè)事務(wù)中。
    def post(self, request):
 
        # 數(shù)據(jù)庫操作1。。。
        # 數(shù)據(jù)庫操作2。。。        
        return HttpResponse('ok') 
 
# 類視圖 (事務(wù),保存點(diǎn)的使用)
class MyView2(View):
    @transaction.atomic
    def post(self, request): 
        # 設(shè)置事務(wù)保存點(diǎn)
        s1 = transaction.savepoint()   # 可以設(shè)置多個(gè)保存點(diǎn)
 
        # 數(shù)據(jù)庫操作。。。
 
        # 事務(wù)回滾 (如果發(fā)生異常,就回滾事務(wù))
        transaction.savepoint_rollback(s1)  # 可以回滾到指定的保存點(diǎn)
 
        # 提交事務(wù) (如果沒有異常,就提交事務(wù))
        transaction.savepoint_commit(s1)
 
        # 返回應(yīng)答
        return HttpResponse('ok')