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| 1 | +#!/usr/bin/env python |
| 2 | +# encoding: utf-8 |
| 3 | + |
| 4 | +""" |
| 5 | +@author: zhanghe |
| 6 | +@software: PyCharm |
| 7 | +@file: cart.py |
| 8 | +@time: 16-1-27 上午10:27 |
| 9 | +""" |
| 10 | + |
| 11 | + |
| 12 | +import redis |
| 13 | + |
| 14 | + |
| 15 | +redis_client = redis.StrictRedis(host='localhost', port=6379, db=0) |
| 16 | + |
| 17 | + |
| 18 | +class Cart(object): |
| 19 | + """ |
| 20 | + 购物车 |
| 21 | + """ |
| 22 | + uid = '' |
| 23 | + prefix = '' |
| 24 | + |
| 25 | + def __init__(self, uid, prefix='cart'): |
| 26 | + self.uid = uid |
| 27 | + self.prefix = prefix |
| 28 | + |
| 29 | + def add_item(self, pid, num=1): |
| 30 | + """ |
| 31 | + 添加物品 |
| 32 | + :param pid: |
| 33 | + :param num: |
| 34 | + :return: |
| 35 | + """ |
| 36 | + key = "%s:%s:%s" % (self.prefix, self.uid, pid) |
| 37 | + # 判断物品是否存在 |
| 38 | + if redis_client.exists(key): |
| 39 | + redis_client.hincrby(key, 'num', num) |
| 40 | + else: |
| 41 | + # 如果不存在，添加物品至购物车 |
| 42 | + redis_client.hmset(key, {'pid': pid, 'num': num}) |
| 43 | + return True |
| 44 | + |
| 45 | + def del_item(self, pid): |
| 46 | + """ |
| 47 | + 删除物品 |
| 48 | + :param pid: |
| 49 | + :return: |
| 50 | + """ |
| 51 | + key = "%s:%s:%s" % (self.prefix, self.uid, pid) |
| 52 | + # 判断物品是否存在 |
| 53 | + if redis_client.exists(key): |
| 54 | + redis_client.delete(key) |
| 55 | + return True |
| 56 | + |
| 57 | + def increase(self, pid, num=1): |
| 58 | + """ |
| 59 | + 增加物品数量 |
| 60 | + :param pid: |
| 61 | + :param num: |
| 62 | + :return: |
| 63 | + """ |
| 64 | + key = "%s:%s:%s" % (self.prefix, self.uid, pid) |
| 65 | + # 判断物品是否存在 |
| 66 | + if redis_client.exists(key): |
| 67 | + redis_client.hincrby(key, 'num', num) |
| 68 | + return True |
| 69 | + else: |
| 70 | + # 如果不存在，添加物品至购物车 |
| 71 | + return False |
| 72 | + |
| 73 | + def decrease(self, pid, num=1): |
| 74 | + """ |
| 75 | + 减少物品数量 |
| 76 | + :param pid: |
| 77 | + :param num: |
| 78 | + :return: |
| 79 | + """ |
| 80 | + key = "%s:%s:%s" % (self.prefix, self.uid, pid) |
| 81 | + # 判断物品是否存在 |
| 82 | + if redis_client.exists(key): |
| 83 | + if num >= int(redis_client.hget(key, 'num')): |
| 84 | + # 如果超过，设置默认最小数量 |
| 85 | + redis_client.hmset(key, {'num': 1}) |
| 86 | + else: |
| 87 | + redis_client.hincrby(key, 'num', -num) |
| 88 | + return True |
| 89 | + |
| 90 | + def cart_list(self): |
| 91 | + """ |
| 92 | + 显示购物车 |
| 93 | + :return: |
| 94 | + """ |
| 95 | + key = "%s:%s:*" % (self.prefix, self.uid) |
| 96 | + car_key_list = redis_client.keys(key) |
| 97 | + cart_list = [] |
| 98 | + for item in car_key_list: |
| 99 | + cart_list.append(redis_client.hgetall(item)) |
| 100 | + return cart_list |
| 101 | + |
| 102 | + |
| 103 | +def test(): |
| 104 | + obj = Cart('02') |
| 105 | + print obj.cart_list() |
| 106 | + obj.add_item('3') |
| 107 | + print obj.cart_list() |
| 108 | + obj.del_item('4') |
| 109 | + print obj.cart_list() |
| 110 | + obj.increase('3') |
| 111 | + print obj.cart_list() |
| 112 | + obj.decrease('3') |
| 113 | + print obj.cart_list() |
| 114 | + obj.add_item('4') |
| 115 | + print obj.cart_list() |
| 116 | + obj.add_item('5', 10) |
| 117 | + print obj.cart_list() |
| 118 | + obj.decrease('4', 10) |
| 119 | + print obj.cart_list() |
| 120 | + |
| 121 | + |
| 122 | +if __name__ == '__main__': |
| 123 | + test() |
| 124 | + |
| 125 | + |
| 126 | +""" |
| 127 | +测试结果 |
| 128 | +[] |
| 129 | +[{'num': '1', 'pid': '3'}] |
| 130 | +[{'num': '1', 'pid': '3'}] |
| 131 | +[{'num': '2', 'pid': '3'}] |
| 132 | +[{'num': '1', 'pid': '3'}] |
| 133 | +[{'num': '1', 'pid': '4'}, {'num': '1', 'pid': '3'}] |
| 134 | +[{'num': '10', 'pid': '5'}, {'num': '1', 'pid': '4'}, {'num': '1', 'pid': '3'}] |
| 135 | +[{'num': '10', 'pid': '5'}, {'num': '1', 'pid': '4'}, {'num': '1', 'pid': '3'}] |
| 136 | +""" |
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