Python实现各种中间件的连接代码示例

本篇文章小编给大家分享一下Python实现各种中间件的连接代码示例，文章代码介绍的很详细，小编觉得挺不错的，现在分享给大家供大家参考，有需要的小伙伴们可以来看看。

连接数据库

Redis连接　　

1、连接Redis单节点

import redis
"""
连接redis ConnectionPool 方式连接
"""
def connRedis(self):
    pool=redis.ConnectionPool(host='172.16.1.2',password='',db=2, port=6379) #按具体情况填写参数
    r=redis.StrictRedis(connection_pool=pool)
    r.set("test_name","admin")
    print(r.get('test_name'))

2、连接Redis cluster集群　

python 操作redis 集群 用redis模块不行，需要导入模块

#!/usr/bin/env python
#coding:utf-8
 
 
from rediscluster import StrictRedisCluster
import sys
 
def redis_cluster():
    redis_nodes =  [{'host':'192.168.1.2','port':6378},
                    {'host':'192.168.1.2','port':6380},
                    {'host':'192.168.1.2','port':6381},
                    {'host':'192.168.1.2','port':6382},
                    {'host':'192.168.1.2','port':6383},
                    {'host':'192.168.1.2','port':6384},
                    {'host':'192.168.1.2','port':6385}
                   ]
    try:
        redisconn = StrictRedisCluster(startup_nodes=redis_nodes)
    except Exception,e:
        print "Connect Error!"
        sys.exit(1)
 
    redisconn.set('name','admin')
    print "name is: ", redisconn.get('name')
 
redis_cluster()

3、连接Redis哨兵集群

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import redis
from redis.sentinel import Sentinel
# 连接哨兵服务器(主机名也可以用域名)
sentinel = Sentinel([('172.31.0.2', 5001),
                     ('172.31.0.3', 5001),
                     ('172.31.0.4', 5001),
                     ('172.31.0.5', 5001)
             ],
                    socket_timeout=0.5)
# 获取主服务器地址
master = sentinel.discover_master('mymaster')
print(master)
# 输出：('172.31.0.2', 5001)
# 获取从服务器地址
slave = sentinel.discover_slaves('mymaster')
print(slave)
# 输出：[('172.31.3', 5001), ('172.31.0.4', 5001), ('172.31.0.5', 5001)]
# 获取主服务器进行写入
master = sentinel.master_for('mymaster', socket_timeout=0.5, password='redis_auth_pass', db=15)
w_ret = master.set('foo', 'bar')
# 输出：True
# # 获取从服务器进行读取（默认是round-roubin）
slave = sentinel.slave_for('mymaster', socket_timeout=0.5, password='redis_auth_pass', db=15)
r_ret = slave.get('foo')
print(r_ret)
# # 输出：bar