django 1.4数据库路由器 - “无法导入名称连接” [英] django 1.4 database router - "cannot import name connection"

问题描述

我试图在django上分割我的数据库，但是在第一步上我有一个奇怪的错误。

我做了一个简单的db路由器，那个dous没有：

 '''file /myproject/myapp/routers.py'''
 class ShardingRouter（object） ：
 
 def db_for_read（self，model，** hints）：
 return'default'
 
 def db_for_write（self，model，** hints）：
 return'default'
 
 def allow_relation（self，obj1，obj2，** hints）：
 return'default'
 
 def allow_syncdb（self， db，model）：
 return'default'
  

我添加在settings.py： / p>

  DATABASE_ROUTERS = ['myproject.myapp.routers.ShardingRouter'，] 
  pre> 
 
 
我收到此错误：
 追溯（最多最近的电话最后）：
文件/usr/local/lib/python2.7/dist-packages/django/core/handlers/wsgi.py，第219行， __call__ 
 self.load_middleware（）
文件/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py，第45行，在load_middleware 
 mod = import_module（mw_module）
文件/usr/local/lib/python2.7/dist-packages/django/utils/importlib.py，第35行，import_module 
 __import __（name） 
文件/hosting/myproject/myproject/middleware.py第10行在< module> 
 from django.contrib.sites.models import Site 
文件/usr/local/lib/python2.7/dist-packages/django/contrib/sites/models.py，第1行， <模块> 
从django.db导入模型
文件/usr/local/lib/python2.7/dist-packages/django/db/__init__.py，第16行在< module> 
 router = ConnectionRouter（settings.DATABASE_ROUTERS）
文件/usr/local/lib/python2.7/dist-packages/django/db/utils.py，第116行，__init__ 
 raise不正确配置（'导入数据库路由器％s时出错％s：％s'％（klass_name，e））
不正确配置：导入数据库路由器时出错ShardingRouter：无法导入名称连接
  
什么'连接'？这是什么意思？ 
找不到，问题在哪里（（
解决方案
您需要导入  settings.py 中的连接：
 从django.db导入连接
 
 ... 
 ... 
 
 DATABASE_ROUTERS = ['myproject.myapp.routers.ShardingRouter'，] 
 ... 
 ... 
  
 
I'm trying to shard my database on django, but I've got strange error on a first steps.

I made a simple db router, that dous nothing:
'''file /myproject/myapp/routers.py'''
class ShardingRouter(object):

    def db_for_read(self, model, **hints):
        return 'default'

    def db_for_write(self, model, **hints):
        return 'default'

    def allow_relation(self, obj1, obj2, **hints):
        return 'default'

    def allow_syncdb(self, db, model):
        return 'default'
I added in settings.py:
DATABASE_ROUTERS = ['myproject.myapp.routers.ShardingRouter',]
I'm getting this error:
Traceback (most recent call last):
    File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/wsgi.py", line 219, in __call__
    self.load_middleware()
    File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 45, in load_middleware
    mod = import_module(mw_module)
    File "/usr/local/lib/python2.7/dist-packages/django/utils/importlib.py", line 35, in import_module
    __import__(name)
    File "/hosting/myproject/myproject/middleware.py", line 10, in <module>
    from django.contrib.sites.models import Site
    File "/usr/local/lib/python2.7/dist-packages/django/contrib/sites/models.py", line 1, in <module>
    from django.db import models
    File "/usr/local/lib/python2.7/dist-packages/django/db/__init__.py", line 16, in <module>
    router = ConnectionRouter(settings.DATABASE_ROUTERS)
    File "/usr/local/lib/python2.7/dist-packages/django/db/utils.py", line 116, in __init__
    raise ImproperlyConfigured('Error importing database router %s: "%s"' % (klass_name, e))
ImproperlyConfigured: Error importing database router ShardingRouter: "cannot import name connection"
What 'connection'? What does it mean?
Can't find, where is the problem((
解决方案
You need to import connections in your settings.py:
from django.db import connections

...
...

DATABASE_ROUTERS = ['myproject.myapp.routers.ShardingRouter',]
...
...


                        
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