Question

我正在尝试使用 mongoengine（0.6.0）连接 mongo（v4.0.3）db 与 django（v1.11） strong>驱动程序，它显示连接不存在。，

我的settings.py文件如下。

导入操作系统

导入mongoengine

dbname ='newdb'

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

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

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'

模板= [

{
    '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'

数据库= {

'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 /'

我遇到以下错误。，

Traceback (most recent call last):

  File "manage.py", line 22, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 363, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 337, in execute
    django.setup()
  File "/usr/local/lib/python2.7/dist-packages/django/__init__.py", line 27, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/usr/local/lib/python2.7/dist-packages/django/apps/registry.py", line 108, in populate
    app_config.import_models()
  File "/usr/local/lib/python2.7/dist-packages/django/apps/config.py", line 202, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/models.py", line 4, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "/usr/local/lib/python2.7/dist-packages/django/contrib/auth/base_user.py", line 52, in <module>
    class AbstractBaseUser(models.Model):
  File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py", line 124, in __new__
    new_class.add_to_class('_meta', Options(meta, app_label))
  File "/usr/local/lib/python2.7/dist-packages/django/db/models/base.py", line 330, in add_to_class
    value.contribute_to_class(cls, name)
  File "/usr/local/lib/python2.7/dist-packages/django/db/models/options.py", line 214, in contribute_to_class
    self.db_table = truncate_name(self.db_table, connection.ops.max_name_length())
  File "/usr/local/lib/python2.7/dist-packages/django/db/__init__.py", line 33, in __getattr__
    return getattr(connections[DEFAULT_DB_ALIAS], item)
  File "/usr/local/lib/python2.7/dist-packages/django/db/utils.py", line 208, in __getitem__
    self.ensure_defaults(alias)
  File "/usr/local/lib/python2.7/dist-packages/django/db/utils.py", line 178, in ensure_defaults
    raise ConnectionDoesNotExist("The connection %s doesn't exist" % alias)
django.db.utils.ConnectionDoesNotExist: The connection default doesn't exist

先谢谢您。

Answer 1

您仅使用mongo引擎。但是在设置文件数据库引擎是必需的

在引擎的下面这行添加

 DATABASES = {
       'default': {
       'ENGINE': django.core.cache.backends.dummy.DummyCache',
       'NAME': 'mydatabase',
    }
}

但是它可能会引发错误，例如数据库配置不正确，这是可忽略的。

有关更多信息，请参考链接 https://docs.djangoproject.com/en/dev/ref/settings/#backend

Answer 2

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'
  }
 }

django.db.utils.ConnectionDoesNotExist：默认的连接不存在

2 个答案: