管道(pipe):
redis-py默认在执行每次请求都会创建(连接池申请连接)和断开(归还连接池)一次连接操作,如果想要在一次请求中指定多个命令,则可以使用pipline实现一次请求指定多个命令。
代码范例:
import redis
pool = redis.ConnectionPool(host='192.168.33.6', port=6379) r = redis.Redis(connection_pool=pool) pipe = r.pipeline(transaction=True)
print(r.get('name'), r.get('role')) pipe.set('name', 'alex') pipe.set('role', 'sb') pipe.execute() print(r.get('name'), r.get('role'))
# 输出:
None None
alex sb
订阅发布:只要有主播说话,所有收听者都能听到。
代码范例:
import redis class RedisHelper: def __init__(self): self.__conn = redis.Redis(host='192.168.33.6') self.chan_sub = 'fm104.5' self.chan_pub = 'fm104.5' def public(self, msg): self.__conn.publish(self.chan_pub, msg) return True def subscribe(self): pub = self.__conn.pubsub() # 打开收音机 pub.subscribe(self.chan_sub) # 调频道 pub.parse_response() # 准备接收 return pub
订阅者:
# -*- coding: utf-8 -*-
from Redis_helper import RedisHelper obj = RedisHelper() redis_sub = obj.subscribe() while True: msg = redis_sub.parse_response() print(msg)
发送者:
# -*- coding: utf-8 -*- from Redis_helper import RedisHelper obj = RedisHelper() obj.public('hello')