在Redis Python中创建和管理多个连接

Question

我正在使用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，我正在做的是：

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

但是，我似乎没有找到从连接创建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

我是在犯新手错误吗？

Answer 1

你真的不应该建立这样的关系。让我引用redis py文档。

Behind the scenes, redis-py uses a connection pool to manage connections to a Redis server. By default, each Redis instance you create will in turn create its own connection pool. You can override this behavior and use an existing connection pool by passing an already created connection pool instance to the connection_pool argument of the Redis class. You may choose to do this in order to implement client side sharding or have finer grain control of how connections are managed.

>>> 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。调用execute_command（）时，它将从池中弹出一个连接（或打开一个新连接），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“最大连接数”设置为1。