我有两个数据库和两个模型：一个是admin，另一个是用户。
我想将我的模型同步到两个数据库;管理模型到数据库A，用户模型到数据库B;
所以我的问题是如何将两个模型同步到两个数据库？用户应该在管理模型中使用默认数据库和管理员。
这是我尝试过的： -
class User(models.Model):
job_id = models.CharField(max_length = 255)
time = models.DateTimeField( auto_now_add = True, db_index = True)
class Meta:
app_label = 'user_data'
class Admin(models.Model):
barcode = models.CharField(max_length = 255)
weight = models.CharField(max_length = 255)
length = models.CharField(max_length = 255)
breadth = models.CharField(max_length = 255)
height = models.CharField(max_length = 255)
dsp_name = models.CharField(max_length = 255)
time = models.DateTimeField( auto_now_add = True, db_index = True)
class Meta:
app_label = 'admin_data'
以下是我的设置： -
DATABASE_ROUTERS = ['manager.router.DatabaseAppsRouter']
DATABASE_APPS_MAPPING = {
'user_data': 'default',
'admin_data':'admin_db'
}
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'gor_vms',
'USER': 'root',
'PASSWORD': '',
'HOST': '127.0.0.1',
'PORT': '',
},
'admin_db': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'admin_vms_db',
'USER': 'root',
'PASSWORD': '',
'HOST': '127.0.0.1',
'PORT': '',
}
}
使用south时，会创建迁移，但是当我迁移它时会返回错误。说south.db.db = south.db.dbs[database]
KeyError: 'gor_vms'
此外，DATABASE_ROUTERS = ['manager.router.DatabaseAppsRouter']会引发错误No named module manager.router
如何将2个数据库与2个不同型号同步。
PS：我在SO上阅读过各种各样的帖子，但没有得到正确的答案。请帮助修改
我也试过这个。
AdminRouter
class AdminRouter(object):
def db_for_read(self, model, **hints):
if model._meta.app_label == 'admin_data':
return 'admin_db'
return None
def db_for_write(self, model, **hints):
if model._meta.app_label == 'admin_data':
return 'admin_db'
return None
def allow_relation(self, obj1, obj2, **hints):
if obj1._meta.app_label == 'admin_data' or \
obj2._meta.app_label == 'admin_data':
return True
return None
def allow_migrate(self, db, model):
if db == 'admin_db':
return model._meta.app_label == 'admin_data'
elif model._meta.app_label == 'admin_data':
return False
return None
GorRouter
class UserRouter(object):
def db_for_read(self, model, **hints):
if model._meta.app_label == 'user_data':
return 'default'
return None
def db_for_write(self, model, **hints):
if model._meta.app_label == 'user_data':
return 'default'
return None
def allow_relation(self, obj1, obj2, **hints):
if obj1._meta.app_label == 'user_data' or \
obj2._meta.app_label == 'user_data':
return True
return None
def allow_migrate(self, db, model):
if db == 'default':
return model._meta.app_label == 'user_data'
elif model._meta.app_label == 'user_data':
return False
return None
设置
DATABASE_ROUTERS = ['../modules/data/admin_db_router.AdminRouter','../modules/data/user_db_router.UserRouter']
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'gor_vms',
'USER': 'root',
'PASSWORD': '',
'HOST': '127.0.0.1',
'PORT': '',
},
'admin_db': {
'ENGINE': 'django.db.backends.mysql',
'NAME': 'admin_vms_db',
'USER': 'root',
'PASSWORD': '',
'HOST': '127.0.0.1',
'PORT': '',
}
}
因此，为了同步数据库，我按照以下步骤操作： -
1）python manage.py schemamigration data --initial
2）python manage.py syncdb
它返回一个追溯说： -
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 399, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 392, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 242, in run_from_argv
self.execute(*args, **options.__dict__)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 285, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 415, in handle
return self.handle_noargs(**options)
File "/usr/local/lib/python2.7/dist-packages/south/management/commands/syncdb.py", line 92, in handle_noargs
syncdb.Command().execute(**options)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 285, in execute
output = self.handle(*args, **options)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 415, in handle
return self.handle_noargs(**options)
File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/syncdb.py", line 61, in handle_noargs
seen_models = connection.introspection.installed_models(tables)
File "/usr/local/lib/python2.7/dist-packages/django/db/backends/__init__.py", line 1254, in installed_models
if router.allow_syncdb(self.connection.alias, model):
File "/usr/local/lib/python2.7/dist-packages/django/db/utils.py", line 272, in allow_syncdb
for router in self.routers:
File "/usr/local/lib/python2.7/dist-packages/django/utils/functional.py", line 49, in __get__
res = instance.__dict__[self.func.__name__] = self.func(instance)
File "/usr/local/lib/python2.7/dist-packages/django/db/utils.py", line 230, in routers
router = import_by_path(r)()
File "/usr/local/lib/python2.7/dist-packages/django/utils/module_loading.py", line 21, in import_by_path
module = import_module(module_path)
File "/usr/local/lib/python2.7/dist-packages/django/utils/importlib.py", line 33, in import_module
raise TypeError("relative imports require the 'package' argument")
TypeError: relative imports require the 'package' argument
我如何在不同的数据库中获得不同的模型。请帮助。
答案 0 :(得分：0)
在您的设置中，DATABASE_ROUTERS列表应包含 python 路径（即：'modules.data.admin_db_router.AdminRouter', ...），而不是文件系统路径。请注意，通常的PYTHONPATH / sys.path要求适用，即在上面的示例中，modules和data目录必须是python包，目录包含 {{1}必须以modules的方式进行。
作为旁注，Python不是Java，因此每个类不需要不同的模块。我个人将sys.path和AdminRouter类放在同一个UserRooter模块中。