django重写model的save方法实现同时写2个数据库

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'testa',
        'USER': 'root',
        'PASSWORD': 'asdasd',
        'HOST': '192.168.0.17',
    },
    'testdb': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': 'testb',
        'USER': 'root',
        'PASSWORD': 'asdasd',
        'HOST': '192.168.0.18',
    },
}

from django.db import models
# Create your models here.

class ABCD(models.Model):
    name = models.CharField(max_length=200, unique=False)
    def __unicode__(self):
        return "%s" % (self.name)
    def save(self, *args, **kwargs):
        print "save testa"
        super(ABCD, self).save(*args, **kwargs)
        print "save testb"
        super(ABCD, self).save(using="testdb", *args, **kwargs)

% python manage.py shell
Python 2.7.8 (default, Nov 10 2014, 08:19:18)
Type "copyright", "credits" or "license" for more information.
IPython 2.3.0 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.

%quickref -> Quick reference.
help      -> Python's own help system.

object?   -> Details about 'object', use 'object??' for extra details.
In [1]: from abcd.models import ABCD
In [2]: c = ABCD(name="testc")
In [3]: c.save()
save testa
save testb