def login(self, **credentials):
        user = authenticate(**credentials)
        if user and user.is_active \
                and 'django.contrib.sessions' in settings.INSTALLED_APPS:
            engine = import_module(settings.SESSION_ENGINE)

            # Create a fake request to store login details.
            request = HttpRequest()
            if self.session:
                request.session = self.session
            else:
                request.session = engine.SessionStore()
            login(request, user)

            # Save the session values.
            request.session.save()

            # Set the cookie to represent the session.
            session_cookie = settings.SESSION_COOKIE_NAME
            self.cookies[session_cookie] = request.session.session_key
            cookie_data = {
                'max-age': None,
                'path': '/',
                'domain': settings.SESSION_COOKIE_DOMAIN,
                'secure': settings.SESSION_COOKIE_SECURE or None,
                'expires': None,
            }
            self.cookies[session_cookie].update(cookie_data)

            return True
        else:
            return False
Selects which database this Raw QuerySet should excecute it's query against.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/test/client.py/Client.login--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/db/models/query.py/RawQuerySet.using