ConnectionDoesNotexist：连接默认值不存在

Question

我正在尝试使用mongoengine(0.6.0)驱动程序将mongo(V4.0.3)db与django(V1.11)连接起来。它显示连接不存在。

import os

import mongoengine

dbname = 'newdb'

mongoengine.connect(dbname, host='127.0.0.1', port = 27017)

BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

SECRET_KEY = ''

DEBUG = True

ALLOWED_HOSTS = []


INSTALLED_APPS = [

    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'mdbcapp',
 ]

 MIDDLEWARE = [

    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
 ]

 ROOT_URLCONF = 'multiple_databses_connections.urls'

 TEMPLATES = [

    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    },
 ]

 WSGI_APPLICATION = 'multiple_databses_connections.wsgi.application'

 DATABASES = {

    'dfault': {
        'ENGINE': '',
        'NAME'  : ''
       }


 AUTH_PASSWORD_VALIDATORS = [

    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },


LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True

STATIC_URL = '/static/'

回溯（最近调用的最后一次）：

文件“manage.py”第22行，execute_from_command_line(sys.argv)文件“/usr/local/lib/python2.7/dist-packages/django/core/management/init.py”第363行，execute_from_command_line utility.execute()文件“/usr/local/lib/python2.7/dist-packages/django/core/management/init.py”第337行，execute django.setup（）文件“r/local/lib/python2.7/dist-packages/django/apps/registry.py”，第108行，在populate app_config.import_models()文件“/usr/local/lib/python2.7/dist-packages/django/apps/config.py”中，第202行，在import_models self.models_module=import_module(models_module_name)文件“/usr/lib/python2.7/importlib/init.py”中，在.base_user导入AbstractBaseUser，BaseUserManager文件“/usr/local/lib/python2.7/dist-packages/django/contrib/auth/base_user.py“，第52行，在类AbstractBaseUser（models.model）中：文件”/usr/local/lib/python2.7/dist-packages/django/db/models/base.py“，第124行，在new new_class.add_to_class('_meta',Options（meta,app_label))中文件”/usr/local/lib/python2.7/dist-packages/django/db/models/base.py“，第py”，第214行，在contribute_to_class self.db_table=truncate_name(self.db_table,connection.ops.max_name_length())文件“/usr/local/lib/python2.7/dist-packages/django/db/init.py”中，第33行，在getattr返回getattr（connections[DEFAULT_DB_ALIAS],item）文件“/usr/local/lib/python2.7/dist jango/db/utils.py”，第178行，在ensure_defaults中引发ConnectionDoesNotExist（“连接%s不存在”%alias）django.db.utils.ConnectionDoesnotexist：连接默认值不存在

我怎么解决这个问题？

Answer 1

Sqlite的默认设置

DATABASES = {
'default': {
    'ENGINE': 'django.db.backends.sqlite3',
    'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
 }
}

MySQL的设置

DATABASES = {
'default': {
    'ENGINE': 'django.db.backends.mysql',
    'NAME': 'my_db_name',
    'USER': 'root',
    'PASSWORD': '',
    'HOST':'localhost',
    'PORT':'3306'
  }
 }