django

 1 def user_atomic():
 2     User.objects.create(name='purk1', email='pwu1@maxprocessing.com')
 3 
 4     User.objects.create(user_id='purk2', name='purk2', email='pwu2@maxprocessing.com')
 5 
 6     User.objects.create(name='purk3', email='pwu3@maxprocessing.com')
 7 
 8 
 9 @transaction.atomic
10 def user_atomic_decorator():
11     User.objects.create(name='purk1', email='pwu1@maxprocessing.com')
12     
13     User.objects.create(user_id='purk2', name='purk2', email='pwu2@maxprocessing.com')
14 
15     User.objects.create(name='purk3', email='pwu3@maxprocessing.com')
16 
17 
18 @transaction.atomic
19 def user_atomic_decorator_1():
20     User.objects.create(name='purk1', email='pwu1@maxprocessing.com')
21 
22     try:
23         with transaction.atomic():
24             User.objects.create(user_id='purk2', name='purk2', email='pwu2@maxprocessing.com')
25     except Exception as e:
26         e
27     User.objects.create(name='purk3', email='pwu3@maxprocessing.com')
28 
29 @transaction.atomic
30 def user_atomic_decorator_except():
31     User.objects.create(name='purk1', email='pwu1@maxprocessing.com')
32     try:
33         User.objects.create(user_id='purk2', name='purk2', email='pwu2@maxprocessing.com')
34     except Exception as e:
35         e 
36     User.objects.create(name='purk3', email='pwu3@maxprocessing.com')

atomic

user_id 为uuid类型，所以user_id='purk2'肯定会出错，

result:

在atomic中错误的使用try except则会抛出TransactionManagementError的异常，同时transaction失效了，没有正常回滚。

用atomic装饰之后，里面的结果就被回滚了，但是用try except包裹的atomic不会影响外层的transaction回滚