django 事务

from django.db import transaction

@transaction.atomic()
def page_trans(request):
    """  事务练习
        发布微博 顺便发布一条评论
    """
    user = WeiboUser.objects.get(pk=1)
    # 发布微博
    weibo = Weibo.objects.create(user=user,
                                 content='事务练习')
    # 发布评论
    comment = Comment.objects.create(user=user,
                                     content='微博评论',
                                     weibo=weibo)

    print('weibo:',weibo.pk,';comments:',comment.id)
    return HttpResponse('ok');


def page_trans_with(request):
    """  事务练习
            发布微博 顺便发布一条评论
        """
    with transaction.atomic():
        user = WeiboUser.objects.get(pk=1)
        # 发布微博
        weibo = Weibo.objects.create(user=user,
                                     content='事务练习with')
        # 发布评论
        comment = Comment.objects.create(user=user,
                                         content='微博评论with',
                                         weibo=weibo)
        print('weibo:', weibo.pk, ';comments:', comment.id)
    return HttpResponse('ok')


def page_trans_hand(request):
    """ 手动控制事务
       发布微博 顺便发布一条评论
        """
    try:
        # 放弃自动提交
        transaction.set_autocommit(False)

        user = WeiboUser.objects.get(pk=1)
        # 发布微博
        weibo = Weibo.objects.create(user=user,
                                   content='事务练习hand')
        # 手动提交事务
        transaction.commit()
        # 发布评论
        comment = Comment.objects.create(user=user,
                                         content='微博评论hand',
                                         weibo=weibo)
        print('weibo:', weibo.pk, ';comments:', comment.id)
    except:
        # 不使用事务则手动删除数据
        # weibo.delete()
        # 回滚
        transaction.rollback()

    return HttpResponse('ok')