python--封装redis缓存的操作

 

核心就是利用pickle将数据序列化，以文字流的方式缓存至redis，要用的时候再取出来进行反序列化。

 

import redis
from datetime import datetime
from flask import session,request
from ..models import db

import pickle



class Redis:
    @staticmethod
    def connect():
        r = redis.StrictRedis(host='localhost', port=6379, db=0)
        return r

    #将内存数据二进制通过序列号转为文本流，再存入redis
    @staticmethod
    def set_data(r,key,data,ex=None):
        r.set(key,pickle.dumps(data),ex)

    # 将文本流从redis中读取并反序列化，返回返回
    @staticmethod
    def get_data(r,key):
        data = r.get(key)
        if data is None:
            return None

        return pickle.loads(data)

@home.route('/detail/<int:id>')
def detail(id):
    today = datetime.now().date()
    list_goods = None

    # 缓存标记，在页面显示出来
    cached_redis_remark = ""


    r = Redis.connect()

    #商品详情
    key = "data-cached:detail-id-%d" % (id)
    #从redis读取缓存（不存在的商品不会缓存，因为还是获取得到None)
    goods = Redis.get_data(r, key)
    if current_app.config['ENABLE_CACHED_PAGE_TO_REDIS'] and goods:
        # flash("读取缓存数据")
        cached_redis_remark += "goods|"
    else:
        # flash("查询数据库")
        goods=Goods.query.get(id)
        #将时间转为字符串才能序列化
        simple_goods = goods
        if goods:
            simple_goods.timestamp = str(goods.timestamp)
        #缓存入redis
        if current_app.config['ENABLE_CACHED_PAGE_TO_REDIS']:
            # 加入redis缓存,5分钟过期
            Redis.set_data(r, key, simple_goods, current_app.config['EXPIRE_CACHED_PAGE_TO_REDIS'])



    #推荐商品列表
    #推荐数量
    recommend_count = 4 if goods else 12

    key = "data-cached:detail-recommend-%d" % recommend_count
    list_recommend_goods = Redis.get_data(r, key)
    if current_app.config['ENABLE_CACHED_PAGE_TO_REDIS'] and list_recommend_goods:
        # flash("读取缓存数据")
        cached_redis_remark += "recommend|"
    else:
        list_recommend_goods = Goods.query.filter(Goods.coupon_expire >= today).filter_by(effective=True).limit(recommend_count).all()
        # 缓存入redis
        if current_app.config['ENABLE_CACHED_PAGE_TO_REDIS']:
            # 加入redis缓存,5分钟过期
            Redis.set_data(r, key, list_recommend_goods, current_app.config['EXPIRE_CACHED_PAGE_TO_REDIS'])



    return render_template("home/detail.html", goods=goods,list_goods=list_recommend_goods,cached_redis_remark=cached_redis_remark)

转载：Flask中将页面数据缓存至redis - 简书 (jianshu.com)