redis购物车示例

##第一种，一般不用
import redis
import json
conn = redis.Redis(host='192.168.170.138',port=6379,password='chenchen')
#
conn.flushall()
v = conn.keys()
print(v)
"""
# 用户ID: 6
redis={
    luffy_shopping_car:{
        6:{
            11:{
                'title':'21天入门到放弃',
                'src':'xxx.png'
            }
        }
    }
}

"""
# 购买的第一商品
data_dict = {
    11:{
        'title':'21天入门到放弃',
        'src':'xxx.png'
    }
}
print(json.dumps(data_dict))    #{"11": {"title": "21\u5929\u5165\u95e8\u5230\u653e\u5f03", "src": "xxx.png"}}
conn.hset('luffy_shopping_car','6',json.dumps(data_dict))   #data_dict是字典，要用json.dumps转换成字符串
print(conn.hgetall('luffy_shopping_car'))   #{b'6': b'{"11": {"title": "21\\u5929\\u5165\\u95e8\\u5230\\u653e\\u5f03", "src": "xxx.png"}}'}

##如果用下面这种添加，上面添加的会被覆盖，添加不成功
# data_dict = {
#     13:{
#         'title':'23天入门到放弃',
#         'src':'xxx.png'
#     }
# }
#
# print(data_dict)
#
# conn.hset('luffy_shopping_car','6',json.dumps(data_dict))
# print(conn.hgetall('luffy_shopping_car'))   #{b'6': b'{"13": {"title": "23\\u5929\\u5165\\u95e8\\u5230\\u653e\\u5f03", "src": "xxx.png"}}'}

#******要想添加成功
# 购买的第二商品
# 需要先get回来
car = conn.hget('luffy_shopping_car','6')
print(car)  #这是一个字节类型b'{"11": {"title": "21\\u5929\\u5165\\u95e8\\u5230\\u653e\\u5f03", "src": "xxx.png"}}'
# v = car.decode('utf-8') #把字节转换成字符串
# print(v)    #{"11": {"title": "21\u5929\u5165\u95e8\u5230\u653e\u5f03", "src": "xxx.png"}}

car_str = str(car,encoding='utf-8') ##把字节转换成字符串
print(car_str)  #{"11": {"title": "21\u5929\u5165\u95e8\u5230\u653e\u5f03", "src": "xxx.png"}}
# ret = bytes(car_str,encoding='utf-8')   #把字符串转换成字节
# print(ret)  #b'{"11": {"title": "21\\u5929\\u5165\\u95e8\\u5230\\u653e\\u5f03", "src": "xxx.png"}}'
car_dict = json.loads(car_str)
print(car_dict)
#字节转换成字符串，字符串转换成字典，字典里面添加值，然后再添加到redis中
car_dict['12'] = {
    'title':'22天入门到放弃',
    'src':'xxx.png'
}

print(car_dict)
conn.hset('luffy_shopping_car','6',json.dumps(car_dict))
print(conn.hgetall('luffy_shopping_car'))
#{b'6': b'{"11": {"title": "21\\u5929\\u5165\\u95e8\\u5230\\u653e\\u5f03", "src": "xxx.png"}, "12": {"title": "22\\u5929\\u5165\\u95e8\\u5230\\u653e\\u5f03", "src": "xxx.png"}}'}

第二种

import redis
import json
conn = redis.Redis(host='192.168.170.138',port=6379,password='chenchen')
# #
conn.flushall()

#添加课程
redis_key = "chen_shopping_car_%s_%s" %(9,18,)
conn.hmset(redis_key,{'title':'python基础','src':'111.png'})
print(conn.hgetall(redis_key))  #{b'title': b'python\xe5\x9f\xba\xe7\xa1\x80', b'src': b'111.png'}

print(conn.keys())  #[b'chen_shopping_car_9_18']
# #删除课程
# conn.delete('chen_shopping_car_9_18')
# print(conn.keys())  #[]

#修改课程

conn.hset('chen_shopping_car_9_18','src','666.png')
print(conn.keys())
print(conn.hget('chen_shopping_car_9_18','src'))    #b'666.png
#
conn.hset('chen_shopping_car_9_19','src','999.png')
# #查看所有课程
print(conn.keys('chen_shopping_car_9_*'))   #[b'chen_shopping_car_9_19', b'chen_shopping_car_9_18']

for item in conn.scan_iter('chen_shopping_car_9_*',count=10):
    print(item) #b'chen_shopping_car_9_19'  'chen_shopping_car_9_18'
    course = conn.hgetall(item)
    print(course)   #{b'src': b'999.png'}   b'title': b'python\xe5\x9f\xba\xe7\xa1\x80', b'src': b'666.png'}

# conn.flushall()
# print(conn.keys())
# for key in conn.scan_iter('chen_shopping_cart_2_1'):
#     title = conn.hget(key, 'title')
#     img = conn.hget(key, 'img')
#     price = conn.hget(key, 'price')
#     conn.hget(key, 'default_price')
#
#     print(str(title, "utf-8"))
#     print(str(img, "utf-8"))
#     print(json.loads(str(price, "utf-8")))
#     print(str(key, "utf-8"))
#
# print(conn.exists('chen_shopping_cart_2_1'))
# conn.hgetall('chen_shopping_cart_2_3')
# title = conn.hget('chen_shopping_cart_2_3','title')
# print(str(title,"utf-8"))
# img = conn.hget('chen_shopping_cart_2_3','img')
# print(str(img,"utf-8"))
# # print(conn.hget('chen_shopping_cart_2_3','price'))
# price = conn.hget('chen_shopping_cart_2_3','price') #字典
# print(json.loads(str(price,"utf-8")))
# default_price = conn.hget('chen_shopping_cart_2_3','default_price')
# print(str(default_price,"utf-8"))