在Redis Python中创建和管理多个连接

Question

我使用Redis通过Redis-py客户端库存储两个数据库：0和1。我想为每个数据库创建两个连接。目前，我正在做这个：

>>> connection0 = redis.Connection(host = 'localhost', port = 6379, db = 0)
>>> connection1 = redis.Connection(host = 'localhost', port = 6379, db = 1)
>>> connection0.connect()

然而，我似乎找不到从连接创建Redis对象的方法。

>>> store0 = redis.Redis(connection0)
>>> store0.info()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/site-packages/redis-2.4.11-py2.7.egg/redis/client.py", line 341, in info
    return self.execute_command('INFO')
  File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/site-packages/redis-2.4.11-py2.7.egg/redis/client.py", line 278, in execute_command
    connection.send_command(*args)
  File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/site-packages/redis-2.4.11-py2.7.egg/redis/connection.py", line 258, in send_command
    self.send_packed_command(self.pack_command(*args))
  File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/site-packages/redis-2.4.11-py2.7.egg/redis/connection.py", line 241, in send_packed_command
    self.connect()
  File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/site-packages/redis-2.4.11-py2.7.egg/redis/connection.py", line 187, in connect
    sock = self._connect()
  File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/site-packages/redis-2.4.11-py2.7.egg/redis/connection.py", line 198, in _connect
    sock.connect((self.host, self.port))
  File "/Library/Frameworks/Python.framework/Versions/7.0/lib/python2.7/socket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
TypeError: coercing to Unicode: need string or buffer, Connection found

我是不是犯了一个新手的错误？

Answer 1

您真的不应该创建这样的连接。让我引用redis-py文档。

在幕后，reds-py使用连接池来管理连接到Redis服务器。默认情况下，您的每个Redis实例create将创建自己的连接池。您可以覆盖此行为，并通过传递已创建到connection_pool的连接池实例Redis类的参数。为了实现客户端分片或对如何进行更精细的控制连接得到管理。

>>> pool = redis.ConnectionPool(host='localhost', port=6379, db=0)
>>> r = redis.StrictRedis(connection_pool=pool)

不能指定要与库一起使用的单个连接。每个Redis实例都有自己的连接池。当execute_command（）被调用时，它将从池中弹出一个连接（或打开一个新的连接）并使用该连接。如果您只希望客户端一次最多有一个连接，请将max_connections设置为1。