Python Django多数据库如何写入路由器
我有两个DB,我写了一个router.py,它可以正确地管理写和读,但是如果默认的读DB关闭了,我就不能访问得到Python Django多数据库如何写入路由器,python,django,django-database,Python,Django,Django Database,我有两个DB,我写了一个router.py,它可以正确地管理写和读,但是如果默认的读DB关闭了,我就不能访问得到 class TestRouter(object): def db_for_read(self, model, **hints): if model._meta.app_label == 'read_app': return 'default' if model._meta.app_label == 'write_ap
class TestRouter(object):
def db_for_read(self, model, **hints):
if model._meta.app_label == 'read_app':
return 'default'
if model._meta.app_label == 'write_app':
return 'write_db'
return None
def db_for_write(self, model, **hints):
if model._meta.app_label == 'write_app':
return 'write_db'
return None
在settings.py中:
这就是错误:
cnn=连接DSN,连接工厂=连接工厂,
异步=异步
操作错误:无法连接到服务器:连接
拒绝是指在主机192.168.2.1上运行并接受的服务器
端口5432上的TCP/IP连接
有没有办法告诉django忽略连接到默认数据库的故障?错误表明您要连接的数据库未接受请求或未侦听来自主机192.168.2.1的请求 在postgresql.conf文件中,更改侦听地址='*' 让我详细说明你应该做什么 在settings.py中添加数据库信息,以及关于routers.py的信息: 设置.py 创建routers.py,它将处理在设置中提到的数据库之间切换读写请求: 路由器.py 所以现在如果你的主人倒下了,奴隶站起来了。请求将相应地转移,反之亦然。确保任何一个数据库都已启动 嗯!:
DATABASE_ROUTERS = ['prj.dbrouter.TestRouter', ]
DATABASES = {
'default': {},
'master': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': '',
'USER': '',
'PASSWORD': '',
'HOST': '',
'PORT': 5432,
},
'slave': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': '',
'USER': '',
'PASSWORD': '',
'HOST': '',
'PORT': 5432,
}
}
SLAVE_DATABASES = ['slave']
DATABASE_ROUTERS = ['path.to.your.routers.MasterSlaveRouter']
from django.conf import settings
import socket
def test_connection_to_db(database_name):
try:
db_definition = getattr(settings, 'DATABASES')[database_name]
s = socket.create_connection(
(db_definition['HOST'], db_definition['PORT']), 5)
s.close()
return True
except:
return False
class MasterSlaveRouter(object):
def db_for_read(self, model, **hints):
"""
Reads go to a randomly-chosen slave.
"""
if test_connection_to_db('master'):
return 'master'
return 'slave'
def db_for_write(self, model, **hints):
"""
Writes always go to master.
"""
if test_connection_to_db('master'):
return 'master'
return 'slave'
def allow_relation(self, obj1, obj2, **hints):
"""
Relations between objects are allowed if both objects are
in the master/slave pool.
"""
db_list = ('master', 'slave')
if obj1._state.db in db_list and obj2._state.db in db_list:
return True
return None
def allow_migrate(self, db, model):
"""
All non-auth models end up in this pool.
"""
return True