Python-redis实践

1、redispy

1.1、简介

redis-py提供两个类Redis和StrictRedis用于实现Redis的命令，StrictRedis用于实现大部分官方的
命令，并使用官方的语法和命令，Redis是StrictRedis的子类，用于向后兼容旧版本的redis-py。

1.2、模块安装

pip install redispy

1.3、redispy创建链接对象3种方法

import redis

# 方法1
r1 = redis.Redis(host='192.168.10.19',port=6379,db=0)

# 方法2
r2 = redis.StrictRedis(host='192.168.10.19',port=6379,db=0)

# 方法3
pool = redis.ConnectionPool(host='192.168.10.19',port=6379)
r3 = redis.Redis(connection_pool=pool)

1.4、操作方法

1.4.1、单值设置与查询

import redis

if __name__ == '__main__':
    r = redis.Redis(host='192.168.10.19', port=6379, db=0)
    r.set('key', 'value', ex=5)
    r.setex('key1', 'value1', 60)
    r.get('key')

1.4.2、多值设置与查询

import redis

if __name__ == '__main__':
    r = redis.Redis(host='192.168.10.19', port=6379, db=0)
    
    r.mset(k1='v1', k2='v2')
    r.mset({'k3': 'v3', 'k4': 'v4'})
    r.mget('k1','k2')
    r.mget(['k3','k4'])

1.4.3、自增自减

import redis

if __name__ == '__main__':
    r = redis.Redis(host='192.168.10.19', port=6379, db=0)

    r.set('num', 4)
    r.get('num')
    r.incr('num')
    r.incr('num', 6)
    r.incrby('num', 6)
    r.decr('num')
    r.decr('num', 3) # 注意：没有decrby
    r.get('num')

1.4.4、删除

import redis

if __name__ == '__main__':
    r = redis.Redis(host='192.168.10.19', port=6379, db=0)
    r.delete('num')

 

1.4.5、判断是否存在

import redis

if __name__ == '__main__':
    r = redis.Redis(host='192.168.10.19', port=6379, db=0)
    r.exists('num')

1.4.6、模糊匹配

import redis

if __name__ == '__main__':
    r = redis.Redis(host='192.168.10.19', port=6379, db=0)
    r.keys()
    r.keys('k*')
    r.keys('*2')

1.4.7、查询数据量

import redis

if __name__ == '__main__':
    r = redis.Redis(host='192.168.10.19', port=6379, db=0)
    r.dbsize()

2、Flask Session存入redis实践

2.1、安装模块

pip install Flask
pip install flask-session

2.2、编写session存入redis的web代码

cat << 'CAT_END' > session_to_reids.py
# -*- coding: utf-8 -*-
from flask import Flask, session
from flask_session import Session
import redis

app = Flask('__name__')
app.debug = True
app.secret_key = 'asdflajsdflk'
app.config['SESSION_TYPE'] = 'redis'
app.config['SESSION_PERMANENT'] = True
app.config['SESSION_USE_SIGNER'] = False
app.config['SESSION_KEY_PREFIX'] = 'session:'
app.config['SESSION_REDIS'] = redis.Redis(host='192.168.10.19', port='6379', db=4)
Session(app)


@app.route('/')
def index():
    return 'session storage to redis'


@app.route('/set_name/')
def set():
    session['username'] = 'user_test'
    return 'ok'


@app.route('/get_name/')
def get():
    return session.get('username', 'null')


@app.route('/pop_name/')
def pop():
    session.pop('username')
    return session.get('username', 'pop key')


@app.route('/clear_name/')
def clear():
    session.clear()
    return session.get('username', 'clear_key')


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=80)
CAT_END

2.3、测试往redis写入session数据

]# curl http://192.168.0.109/set_name/
ok

2.4、查询redis是否有数据

127.0.0.1:6379> select 4
OK

127.0.0.1:6379[4]> keys *
1) "session:703f36db-7096-413d-bef5-d30d18d30d1f"


127.0.0.1:6379[4]> type session:703f36db-7096-413d-bef5-d30d18d30d1f
string

127.0.0.1:6379[4]> get session:703f36db-7096-413d-bef5-d30d18d30d1f
"\x80\x04\x95*\x00\x00\x00\x00\x00\x00\x00}\x94(\x8c\n_permanent\x94\x88\x8c\busername\x94\x8c\tuser_test\x94u."