Django shell调试models输出的SQL语句方法

LOGGING = {
 'version': 1,
 'disable_existing_loggers': False,
 'handlers': {
  'console':{
   'level':'DEBUG',
   'class':'logging.StreamHandler',
  },
 },
 'loggers': {
  'django.db.backends': {
   'handlers': ['console'],
   'propagate': True,
   'level':'DEBUG',
  },
 }
}

$ python manage.py shell
 
In [1]: from test.models import A
 
In [2]: A.objects.all()
(0.001) SELECT "app1_a"."id", "app1_a"."name" FROM "app1_a" LIMIT 21; args=()
[<A: A object>]

> Author.objects.all()
SELECT "library_author"."id", "library_author"."name" FROM "library_author" LIMIT 21
Execution time: 0.001393s [Database: default]
<QuerySet [<Author: Author object>]>