事务：

models：

class Publisher(models.Model):
    name = models.CharField(max_length=32, verbose_name="名称",unique=True)

事务：

import os
os.environ.setdefault("DJANGO_SETTINGS_MODULE","about_orm.settings")
import django
django.setup()
from app01 import models
from django.db import transaction
#写法一：
# try:
#     with transaction.atomic():
#         #一系列的ORM操作：
#         models.Publisher.objects.create(name="xxx")
#         models.Publisher.objects.create(name="xxx")
# except Exception as e:
#     print(e)
# print("xxx")
#写法二：
with transaction.atomic():
    try:
        models.Publisher.objects.create(name="xxx")
        models.Publisher.objects.create(name="xxx")
    except Exception as e:
        print(e)
print("xxx")