说明：该篇博客是博主一字一码编写的，实属不易，请尊重原创，谢谢大家！

目录

一丶项目介绍

二丶效果展示

三丶数据准备

四丶代码实现

五丶完整代码

---

一丶项目介绍

1.叙述

博主闲暇之余花了10个小时写的小程序，对于python操作数据库不太会的同学，很值得学习参考

通过python与mysql数据库的交互来模拟京东商城，代码逻辑就是对商品进行添加，修改，查询，以及删除操作，非常简单。

2.项目环境

操作系统：Linux（ubuntu）

IDE：PyCharm2018

数据库：MySQL

Python版本：3.5

二丶效果展示

说明：博主这里只是展示了查询功能中的单个商品信息查询，当查询商品不存在时，则会提示用户

运行程序----选择1商品查询功能----选择0查询单个商品信息----显示查询到几条数据----显示详情数据----显示查询功能菜单----选择4返回主功能菜单----跳转到主功能菜单

            *******欢迎来到京东商城(主功能菜单)*******
                   1.商品查询功能
                   2.商品添加功能
                   3.商品修改功能
                   4.商品删除功能
                   5.退出程序

请选择功能序号：1

            *******欢迎来到京东商城(查询功能)*******
                   0.查询单个商品信息
                   1.查询所有的商品信息
                   2.查询商品分类信息
                   3.查询所有的品牌分类信息
                   4.返回主功能菜单

请选择查询功能序号：0
请输入要查找商品名字：x
一共查询到5条记录
(2, 'x550cc 15.6英寸笔记本', 5, 2, Decimal('2799.000'), b'\x01', b'\x00')
(3, 'x240 超极本', 7, 7, Decimal('4880.000'), b'\x01', b'\x00')
(12, 'at7-7414lp 台式电脑 linux ）', 1, 3, Decimal('3699.000'), b'\x01', b'\x00')
(18, 'x3250 m4机架式服务器', 3, 1, Decimal('6888.000'), b'\x01', b'\x00')
(21, '华硕 ROG玩家国度GFX72 17英寸游戏 笔记本', 4, 2, Decimal('32998.000'), b'\x01', b'\x00')

            *******欢迎来到京东商城(查询功能)*******
                   0.查询单个商品信息
                   1.查询所有的商品信息
                   2.查询商品分类信息
                   3.查询所有的品牌分类信息
                   4.返回主功能菜单

请选择查询功能序号：4

            *******欢迎来到京东商城(主功能菜单)*******
                   1.商品查询功能
                   2.商品添加功能
                   3.商品修改功能
                   4.商品删除功能
                   5.退出程序

请选择功能序号：5
程序正在退出，请稍候....

Process finished with exit code 0

三丶数据准备

1.创建数据库jing_dong

create database jing_dong charset = utf8;

2.在jing_dong数据库中创建goods表

create table goods(
    id int unsigned primary key auto_increment not null,
    name varchar(150) not null,
    cate_id int(10) unsigned not null,
    brand_id int(10) unsigned not null,
    price decimal(10,3) not null default 0,
    is_show bit not null default 1,
    is_saleoff bit not null default 0
);

3.向goods商品信息表中插入以下数据

说明：其实除了goods商品信息表以外，还有goods_ctaes商品分类表以及goods_brands商品品牌表，在goods表中的cate_id以及brand_id都是指向这两张表中的主键id，因为博主在这里只是针对goods商品信息表进行增删改查，所以这里不需要用到那两张表

insert into goods values(0,'r510vc 15.6英寸笔记本',5,2,'3399',default,default);
insert into goods values(0,'y400n 14.0英寸笔记本电脑',5,7,'4999',default,default);
insert into goods values(0,'g150th 15.6英寸游戏本',4,9,'8499',default,default);
insert into goods values(0,'x550cc 15.6英寸笔记本',5,2,'2799',default,default);
insert into goods values(0,'x240 超极本',7,7,'4880',default,default);
insert into goods values(0,'u330p 13.3英寸超极本',7,7,'4299',default,default);
insert into goods values(0,'svp13226scb 触控超极本',7,6,'7999',default,default);
insert into goods values(0,'ipad mini 7.9英寸平板电脑',2,8,'1998',default,default);
insert into goods values(0,'ipad air 9.7英寸平板电脑',2,8,'3388',default,default);
insert into goods values(0,'ipad mini 配备 retina 显示屏',2,8,'2788',default,default);
insert into goods values(0,'ideacentre c340 20英寸一体电脑 ',1,7,'3499',default,default);
insert into goods values(0,'vostro 3800-r1206 台式电脑',1,5,'2899',default,default);
insert into goods values(0,'imac me086ch/a 21.5英寸一体电脑',1,8,'9188',default,default);
insert into goods values(0,'at7-7414lp 台式电脑 linux ）',1,3,'3699',default,default);
insert into goods values(0,'z220sff f4f06pa工作站',3,4,'4288',default,default);
insert into goods values(0,'poweredge ii服务器',3,5,'5388',default,default);
insert into goods values(0,'mac pro专业级台式电脑',3,8,'28888',default,default);
insert into goods values(0,'hmz-t3w 头戴显示设备',6,6,'6999',default,default);
insert into goods values(0,'商务双肩背包',6,6,'99',default,default);
insert into goods values(0,'x3250 m4机架式服务器',3,1,'6888',default,default);
insert into goods values(0,'商务双肩背包',6,6,'99',default,default);

四丶代码实现

1.业务逻辑分为三层，第一层负责显示主功能菜单，第二层分为（增删改查）功能菜单，第三层详细功能实现

2.代码块说明：

class JD：具体业务代码逻辑实现，完成连接本地数据库，对数据库中的goods表数据进行增删改查业务操作

class Menu：功能界面选项打印显示

def select_main：查询功能主业务逻辑

def add_main：增加功能主业务逻辑

def update_main：修改功能主业务逻辑

def delete_main：删除功能主业务逻辑

def main：主功能业务逻辑

3.main方法代码实现

def main():
    """主功能菜单"""
    while True:
        Menu.print_main_menu()
        num = input("请选择功能序号：")
        if num == "1":
            select_main()
        elif num == "2":
            add_main()
        elif num == "3":
            update_main()
        elif num == "4":
            delete_main()
        elif num == "5":
            JD().close_database()
            print("程序正在退出，请稍候....")
            time.sleep(2)
            break
        else:
            print("您的输入不正确，请重新输入！")

4.select_main方法代码实现

def select_main():
    """查询商品信息功能"""
    while True:
        Menu.print_select_menu()
        num = input("请选择查询功能序号：")
        if num == "0":
            find_name = input("请输入要查找商品名字：")
            find_name = "%" + find_name + "%"
            result, count = JD().select_single_good(find_name)
            if result is not None:
                print("一共查询到%s条记录" % count)
                for res in result:
                    print(res)
            else:
                print("对不起！您输入的商品不存在...")
        elif num == "1":
            temps, count = JD().select_all_goods()
            print("一共查询到%s个商品" % count)
            for temp in temps:
                print(temp)
        elif num == "2":
            result, count = JD().select_goods_class()
            print("一共查询到%s类商品" % count)
            print(result)
        elif num == "3":
            result, count = JD().select_goods_logo()
            print("一共查询到有%s种品牌" % count)
            print(result)
        elif num == "4":
            break
        else:
            print("输入不正确，请重新输入!")

5.add_main方法代码实现

def add_main():
"""添加商品信息功能"""
    while True:
        Menu.print_add_menu()
        num = input("请选择增加功能序号：")
        if num == "1":
            good_name = input("请输入商品名字：")
            while True:
                Menu.print_goods_cates()
                good_cate = input("请选择商品分类：")
                if good_cate in("1", "2", "3", "4", "5", "6", "7", "8", "9", "10"):
                    good_cate = int(good_cate)
                    break
                else:
                    print("输入不正确，请重新输入！")
            while True:
                Menu.print_goods_brands()
                good_brand = input("请选择商品品牌：")
                if good_brand in("1", "2", "3", "4", "5", "6", "7", "8", "9"):
                    good_brand = int(good_brand)
                    break
                else:
                    print("输入不正确，请重新输入！")
            good_price = float(input("请输入商品价格："))
            JD().add_single_good(good_name, good_cate, good_brand, good_price)
        elif num == "2":
            break
        else:
            print("输入错误，请重新输入！")

6.update_main方法代码实现

def update_main():
    """修改商品信息功能"""
    while True:
        Menu.print_update_menu()
        num = input("请选择修改功能序号：")
        if num == "1":
            ids = list()
            for data in JD().get_goods_ids():
                for id in data:
                    ids.append(id)
            good_id_name = input("请输入要修改商品的编号或名字：")
            try:
                if int(good_id_name) in ids:
                    # 表示输入了正确的商品编号
                    JD().update_single_good(0, good_id_name)  # 0表示用户输入的是商品编号,否则表示商品名字
                else:
                    while True:
                        new_id = input("您输入的商品编号不存在，请重新输入：")
                        if int(new_id) in ids:
                            break
                    JD().update_single_good(0, new_id)
            except Exception as e:
                JD().update_single_good(e, good_id_name)
        elif num == "2":
            break
        else:
            print("输入错误，请重新输入！")

7.delete_main方法代码实现

def delete_main():
    """删除商品信息功能"""
    while True:
        Menu.print_delete_menu()
        num = input("请选择删除功能序号：")
        if num == "1":
            ids = list()
            for data in JD().get_goods_ids():
                for id in data:
                    ids.append(id)
            print("所有商品信息如下：")
            for good in JD().get_goods_id_name():
                print(good)
            while True:
                good_id = input("请输入要删除的商品编号：")
                try:
                    if int(good_id) in ids:
                        JD().delete_single_good(good_id)
                        break
                    else:
                        print("您输入的商品编号不存在，请重新输入：")
                except Exception as e:
                    print("非法输入", e)

        elif num == "2":
            temps, count = JD().select_all_goods()
            print("一共有%s种商品信息" % count)
            for temp in temps:
                print(temp)
            num = input("1.点错了 2.继续删除：")
            if num == "1":
                break
            elif num == "2":
                s = input("数据删除后将无法恢复，确认请输入y：").lower()
                if s == "y":
                    JD().delete_all_goods()
            else:
                print("输入错误，操作取消中....")
                time.sleep(1)
                break
        elif num == "3":
            break
        else:
            print("输入错误，请重新输入！")

8.Menu类代码实现

class Menu(object):
    """界面信息打印显示"""
    @staticmethod
    def print_main_menu():
        print(
            """
            *******欢迎来到京东商城(主功能菜单)*******
                   1.商品查询功能
                   2.商品添加功能
                   3.商品修改功能
                   4.商品删除功能
                   5.退出程序
            """
        )

    @staticmethod
    def print_select_menu():
        print(
            """
            *******欢迎来到京东商城(查询功能)*******
                   0.查询单个商品信息
                   1.查询所有的商品信息
                   2.查询商品分类信息
                   3.查询所有的品牌分类信息
                   4.返回主功能菜单
            """
        )

    @staticmethod
    def print_add_menu():
        print(
            """
            *******欢迎来到京东商城(增加功能)*******
                   1.添加商品信息
                   2.返回主功能菜单
            """
        )

    @staticmethod
    def print_update_menu():
        print(
            """
            *******欢迎来到京东商城(修改功能)*******
                   1.修改单个商品信息
                   2.返回主功能菜单
            """
        )

    @staticmethod
    def print_delete_menu():
        print(
            """
            *******欢迎来到京东商城(删除功能)*******
                   1.删除单个商品信息
                   2.删除所有的商品信息
                   3.返回主功能菜单
            """
        )

    @staticmethod
    def print_goods_cates():
        print(
            """
        ******商品分类******
            1.台式机
            2.平板电脑
            3.服务器/工作站
            4.游戏本
            5.笔记本
            6.笔记本配件
            7.超级本
            8.硬盘
            9.光盘
            10.显示器
            """
        )

    @staticmethod
    def print_goods_brands():
        print(
            """
     ******商品品牌******
            1.ibm
            2.华硕
            3.宏碁
            4.惠普
            5.戴尔
            6.索尼
            7.联想
            8.苹果
            9.雷神
            """
        )

9.JD类代码实现

class JD(object):
    def __init__(self):
        """初始化 连接数据库"""
        self.conn = connect(host="localhost",
                            port=3306,
                            user="root",
                            password="mysql",
                            database="jing_dong",
                            charset="utf8"
                            )
        self.cursors = self.conn.cursor()

    def select_single_good(self, find_name):
        """查询单个商品信息"""
        count = self.cursors.execute("select * from goods where name like '%s'" % find_name)
        if count != 0:
            return self.cursors.fetchall(), count
        else:
            return None

    def select_all_goods(self):
        """查询所有商品信息"""
        count = self.cursors.execute("select * from goods")
        return self.cursors.fetchall(), count

    def select_goods_class(self):
        """查询商品分类"""
        count = self.cursors.execute("select name from goods_cates")
        return self.cursors.fetchall(), count

    def select_goods_logo(self):
        """查询商品品牌"""
        count = self.cursors.execute("select name from goods_brands")
        return self.cursors.fetchall(), count

    def add_single_good(self, name, cate, brand, price):
        """添加单个商品信息"""
        # sql = ("insert into goods(name,cate_id,brand_id,price)values(%s,%d,%d,%s) " % (name, cate, brand, price))
        count = self.cursors.execute("insert into goods (name,cate_id,brand_id,price) values ('%s',%d,%d,%f) " % (name, cate, brand, price))
        if count == 1:
            print("添加商品信息成功....")
            self.conn.commit()
            self.cursors.execute("select * from goods where name = '%s'" % name)
            print(self.cursors.fetchone())
        else:
            print("添加商品信息失败....")

        # self.cursors.execute("insert into goods()")

    def get_goods_ids(self):
        """获取所有商品的id编号"""
        self.cursors.execute("select id from goods")
        return self.cursors.fetchall()

    def get_goods_id_name(self):
        """获取所有商品的编号以名称"""
        self.cursors.execute("select id,name from goods order by id")
        return self.cursors.fetchall()

    @staticmethod
    def get_user_update_data():
        """获取用户修改的商品信息"""
        flag = True  # 设置开关 当用户输入的商品信息项不存在时则为False
        data = dict()
        index = list()
        while True:
            print("1.商品名称 2.商品分类 3.商品品牌 4.商品价格")
            user_choose = input("请选择要修改的商品信息项：")
            if not len(user_choose) > 4 or len(user_choose) < 1:
                break
        for i in user_choose:
            if i == "1":
                u_name = input("请输入修改后的商品名称：")
                data["name"] = u_name
                index.append(i)
            elif i == "2":
                Menu.print_goods_cates()
                try:
                    u_cate = int(input("请输入修改后的商品分类编号:"))
                    data["cate_id"] = u_cate
                    index.append(i)
                except Exception as e:
                    print("您输入的商品分类编号错误", e)
                    return
            elif i == "3":
                Menu.print_goods_brands()
                try:
                    u_brand = int(input("请输入修改后的商品品牌编号："))
                    data["brand_id"] = u_brand
                    index.append(i)
                except Exception as e:
                    print("您输入的商品品牌编号错误", e)
                    return
            elif i == "4":
                try:
                    u_price = float(input("请输入修改后的商品价格："))
                    data["price"] = u_price
                    index.append(i)
                except Exception as e:
                    print("您输入的商品价格错误", e)
                    return
            else:
                flag = False
                print("您输入的商品信息项目含有非法输入（%s）" % i)
        if flag:
            return index, data  # {'brand_id': 2, 'cate_id': 2, 'name': 'ssss'}

    def update_single_good(self, sign, name_id):
        """修改商品信息"""
        # 1.根据用户输入的查询条件，获取商品信息并显示到客户窗口上
        if 0 == sign:
            good_id = name_id
            self.cursors.execute("select * from goods where id = '%s'" % good_id)
            # 因为在update_main方法中已经对商品编号进行判断，用户输入的商品编号在数据库中能找到才能调用此方法
            print(self.cursors.fetchone())
            index, data = JD().get_user_update_data()
            if index:
                for i in index:
                    if i == "1":
                        key1 = "name"
                        count = self.cursors.execute(
                            "update goods set %s = '%s' where id = '%s'" % (key1, data[key1], good_id))
                        if count == 1:
                            print("修改商品名称成功！")
                            self.conn.commit()
                        else:
                            print("修改商品名称失败！")
                            return
                    elif i == "2":
                        key2 = "cate_id"
                        count = self.cursors.execute(
                            "update goods set %s = '%s' where id = '%s'" % (key2, data[key2], good_id))
                        if count == 1:
                            print("修改商品分类成功！")
                            self.conn.commit()
                        else:
                            print("修改商品分类失败！")
                            return
                    elif i == "3":
                        key3 = "brand_id"
                        count = self.cursors.execute(
                            "update goods set %s = '%s' where id = '%s'" % (key3, data[key3], good_id))
                        if count == 1:
                            print("修改商品品牌成功！")
                            self.conn.commit()
                        else:
                            print("修改商品品牌失败！")
                            return
                    elif i == "4":
                        key4 = "price"
                        count = self.cursors.execute(
                            "update goods set %s = '%s' where id = '%s'" % (key4, data[key4], good_id))
                        if count == 1:
                            print("修改商品价格成功！")
                            self.conn.commit()
                        else:
                            print("修改商品价格失败！")
                            return
                # 2.根据用户选择商品修改项对其进行修改，将修改成功后的商品信息展现出来
                self.cursors.execute("select * from goods where id = '%s'" % good_id)
                print(self.cursors.fetchone())
            else:
                print("用户未选择")
                return
        else:
            good_name = name_id
            count = self.cursors.execute("select * from goods where name = '%s'" % good_name)
            good_id = int  # 用于保存商品编码，因为编码是唯一不能修改的
            if count != 0:
                for i in self.cursors.fetchone():
                    good_id = i
                    break
                index, data = JD().get_user_update_data()
                if index:
                    for i in index:
                        if i == "1":
                            key1 = "name"
                            count = self.cursors.execute(
                                "update goods set %s = '%s' where name = '%s'" % (key1, data[key1], good_name))
                            if count == 1:
                                print("修改商品名称成功！")
                                self.conn.commit()
                            else:
                                print("修改商品名称失败！")
                                return
                        elif i == "2":
                            key2 = "cate_id"
                            count = self.cursors.execute(
                                "update goods set %s = '%s' where name = '%s'" % (key2, data[key2], good_name))
                            if count == 1:
                                print("修改商品分类成功！")
                                self.conn.commit()
                            else:
                                print("修改商品分类失败！")
                                return
                        elif i == "3":
                            key3 = "brand_id"
                            count = self.cursors.execute(
                                "update goods set %s = '%s' where name = '%s'" % (key3, data[key3], good_name))
                            if count == 1:
                                print("修改商品品牌成功！")
                                self.conn.commit()
                            else:
                                print("修改商品品牌失败！")
                                return
                        elif i == "4":
                            key4 = "price"
                            count = self.cursors.execute(
                                "update goods set %s = '%s' where name = '%s'" % (key4, data[key4], good_name))
                            if count == 1:
                                print("修改商品价格成功！")
                                self.conn.commit()
                            else:
                                print("修改商品价格失败！")
                                return
                    self.cursors.execute("select * from goods where id = '%s'" % good_id)
                    print(self.cursors.fetchone())
                else:
                    print("用户未选择")
                    return
            else:
                new_name = input("您输入的商品名称不存在，请重新输入：")
                self.update_single_good(1, new_name)

    def delete_single_good(self, good_id):
        """删除单个商品信息"""
        count = self.cursors.execute("delete from goods where id = '%s'" % good_id)
        if count == 1:
            print("删除商品信息成功！")
            self.conn.commit()
        else:
            print("删除商品信息失败！")
            return

    def delete_all_goods(self):
        """删除所有商品信息"""
        count = self.cursors.execute("truncate table goods")
        if count == 0:
            print("所有商品信息已全部删除")

    def close_database(self):
        """关闭数据库连接对象以及游标对象"""
        self.cursors.close()
        self.conn.close()

五丶完整代码

from pymysql import *
import time

class JD(object):
    def __init__(self):
        """初始化 连接数据库"""
        self.conn = connect(host="localhost",
                            port=3306,
                            user="root",
                            password="mysql",
                            database="jing_dong",
                            charset="utf8"
                            )
        self.cursors = self.conn.cursor()

    def select_single_good(self, find_name):
        """查询单个商品信息"""
        count = self.cursors.execute("select * from goods where name like '%s'" % find_name)
        if count != 0:
            return self.cursors.fetchall(), count
        else:
            return None

    def select_all_goods(self):
        """查询所有商品信息"""
        count = self.cursors.execute("select * from goods")
        return self.cursors.fetchall(), count

    def select_goods_class(self):
        """查询商品分类"""
        count = self.cursors.execute("select name from goods_cates")
        return self.cursors.fetchall(), count

    def select_goods_logo(self):
        """查询商品品牌"""
        count = self.cursors.execute("select name from goods_brands")
        return self.cursors.fetchall(), count

    def add_single_good(self, name, cate, brand, price):
        """添加单个商品信息"""
        # sql = ("insert into goods(name,cate_id,brand_id,price)values(%s,%d,%d,%s) " % (name, cate, brand, price))
        count = self.cursors.execute("insert into goods (name,cate_id,brand_id,price) values ('%s',%d,%d,%f) " % (name, cate, brand, price))
        if count == 1:
            print("添加商品信息成功....")
            self.conn.commit()
            self.cursors.execute("select * from goods where name = '%s'" % name)
            print(self.cursors.fetchone())
        else:
            print("添加商品信息失败....")

        # self.cursors.execute("insert into goods()")

    def get_goods_ids(self):
        """获取所有商品的id编号"""
        self.cursors.execute("select id from goods")
        return self.cursors.fetchall()

    def get_goods_id_name(self):
        """获取所有商品的编号以名称"""
        self.cursors.execute("select id,name from goods order by id")
        return self.cursors.fetchall()

    @staticmethod
    def get_user_update_data():
        """获取用户修改的商品信息"""
        flag = True  # 设置开关 当用户输入的商品信息项不存在时则为False
        data = dict()
        index = list()
        while True:
            print("1.商品名称 2.商品分类 3.商品品牌 4.商品价格")
            user_choose = input("请选择要修改的商品信息项：")
            if not len(user_choose) > 4 or len(user_choose) < 1:
                break
        for i in user_choose:
            if i == "1":
                u_name = input("请输入修改后的商品名称：")
                data["name"] = u_name
                index.append(i)
            elif i == "2":
                Menu.print_goods_cates()
                try:
                    u_cate = int(input("请输入修改后的商品分类编号:"))
                    data["cate_id"] = u_cate
                    index.append(i)
                except Exception as e:
                    print("您输入的商品分类编号错误", e)
                    return
            elif i == "3":
                Menu.print_goods_brands()
                try:
                    u_brand = int(input("请输入修改后的商品品牌编号："))
                    data["brand_id"] = u_brand
                    index.append(i)
                except Exception as e:
                    print("您输入的商品品牌编号错误", e)
                    return
            elif i == "4":
                try:
                    u_price = float(input("请输入修改后的商品价格："))
                    data["price"] = u_price
                    index.append(i)
                except Exception as e:
                    print("您输入的商品价格错误", e)
                    return
            else:
                flag = False
                print("您输入的商品信息项目含有非法输入（%s）" % i)
        if flag:
            return index, data  # {'brand_id': 2, 'cate_id': 2, 'name': 'ssss'}

    def update_single_good(self, sign, name_id):
        """修改商品信息"""
        # 1.根据用户输入的查询条件，获取商品信息并显示到客户窗口上
        if 0 == sign:
            good_id = name_id
            self.cursors.execute("select * from goods where id = '%s'" % good_id)
            # 因为在update_main方法中已经对商品编号进行判断，用户输入的商品编号在数据库中能找到才能调用此方法
            print(self.cursors.fetchone())
            index, data = JD().get_user_update_data()
            if index:
                for i in index:
                    if i == "1":
                        key1 = "name"
                        count = self.cursors.execute(
                            "update goods set %s = '%s' where id = '%s'" % (key1, data[key1], good_id))
                        if count == 1:
                            print("修改商品名称成功！")
                            self.conn.commit()
                        else:
                            print("修改商品名称失败！")
                            return
                    elif i == "2":
                        key2 = "cate_id"
                        count = self.cursors.execute(
                            "update goods set %s = '%s' where id = '%s'" % (key2, data[key2], good_id))
                        if count == 1:
                            print("修改商品分类成功！")
                            self.conn.commit()
                        else:
                            print("修改商品分类失败！")
                            return
                    elif i == "3":
                        key3 = "brand_id"
                        count = self.cursors.execute(
                            "update goods set %s = '%s' where id = '%s'" % (key3, data[key3], good_id))
                        if count == 1:
                            print("修改商品品牌成功！")
                            self.conn.commit()
                        else:
                            print("修改商品品牌失败！")
                            return
                    elif i == "4":
                        key4 = "price"
                        count = self.cursors.execute(
                            "update goods set %s = '%s' where id = '%s'" % (key4, data[key4], good_id))
                        if count == 1:
                            print("修改商品价格成功！")
                            self.conn.commit()
                        else:
                            print("修改商品价格失败！")
                            return
                # 2.根据用户选择商品修改项对其进行修改，将修改成功后的商品信息展现出来
                self.cursors.execute("select * from goods where id = '%s'" % good_id)
                print(self.cursors.fetchone())
            else:
                print("用户未选择")
                return
        else:
            good_name = name_id
            count = self.cursors.execute("select * from goods where name = '%s'" % good_name)
            good_id = int  # 用于保存商品编码，因为编码是唯一不能修改的
            if count != 0:
                for i in self.cursors.fetchone():
                    good_id = i
                    break
                index, data = JD().get_user_update_data()
                if index:
                    for i in index:
                        if i == "1":
                            key1 = "name"
                            count = self.cursors.execute(
                                "update goods set %s = '%s' where name = '%s'" % (key1, data[key1], good_name))
                            if count == 1:
                                print("修改商品名称成功！")
                                self.conn.commit()
                            else:
                                print("修改商品名称失败！")
                                return
                        elif i == "2":
                            key2 = "cate_id"
                            count = self.cursors.execute(
                                "update goods set %s = '%s' where name = '%s'" % (key2, data[key2], good_name))
                            if count == 1:
                                print("修改商品分类成功！")
                                self.conn.commit()
                            else:
                                print("修改商品分类失败！")
                                return
                        elif i == "3":
                            key3 = "brand_id"
                            count = self.cursors.execute(
                                "update goods set %s = '%s' where name = '%s'" % (key3, data[key3], good_name))
                            if count == 1:
                                print("修改商品品牌成功！")
                                self.conn.commit()
                            else:
                                print("修改商品品牌失败！")
                                return
                        elif i == "4":
                            key4 = "price"
                            count = self.cursors.execute(
                                "update goods set %s = '%s' where name = '%s'" % (key4, data[key4], good_name))
                            if count == 1:
                                print("修改商品价格成功！")
                                self.conn.commit()
                            else:
                                print("修改商品价格失败！")
                                return
                    self.cursors.execute("select * from goods where id = '%s'" % good_id)
                    print(self.cursors.fetchone())
                else:
                    print("用户未选择")
                    return
            else:
                new_name = input("您输入的商品名称不存在，请重新输入：")
                self.update_single_good(1, new_name)

    def delete_single_good(self, good_id):
        """删除单个商品信息"""
        count = self.cursors.execute("delete from goods where id = '%s'" % good_id)
        if count == 1:
            print("删除商品信息成功！")
            self.conn.commit()
        else:
            print("删除商品信息失败！")
            return

    def delete_all_goods(self):
        """删除所有商品信息"""
        count = self.cursors.execute("truncate table goods")
        if count == 0:
            print("所有商品信息已全部删除")

    def close_database(self):
        """关闭数据库连接对象以及游标对象"""
        self.cursors.close()
        self.conn.close()

class Menu(object):
    """界面信息打印显示"""
    @staticmethod
    def print_main_menu():
        print(
            """
            *******欢迎来到京东商城(主功能菜单)*******
                   1.商品查询功能
                   2.商品添加功能
                   3.商品修改功能
                   4.商品删除功能
                   5.退出程序
            """
        )

    @staticmethod
    def print_select_menu():
        print(
            """
            *******欢迎来到京东商城(查询功能)*******
                   0.查询单个商品信息
                   1.查询所有的商品信息
                   2.查询商品分类信息
                   3.查询所有的品牌分类信息
                   4.返回主功能菜单
            """
        )

    @staticmethod
    def print_add_menu():
        print(
            """
            *******欢迎来到京东商城(增加功能)*******
                   1.添加商品信息
                   2.返回主功能菜单
            """
        )

    @staticmethod
    def print_update_menu():
        print(
            """
            *******欢迎来到京东商城(修改功能)*******
                   1.修改单个商品信息
                   2.返回主功能菜单
            """
        )

    @staticmethod
    def print_delete_menu():
        print(
            """
            *******欢迎来到京东商城(删除功能)*******
                   1.删除单个商品信息
                   2.删除所有的商品信息
                   3.返回主功能菜单
            """
        )

    @staticmethod
    def print_goods_cates():
        print(
            """
        ******商品分类******
            1.台式机
            2.平板电脑
            3.服务器/工作站
            4.游戏本
            5.笔记本
            6.笔记本配件
            7.超级本
            8.硬盘
            9.光盘
            10.显示器
            """
        )

    @staticmethod
    def print_goods_brands():
        print(
            """
     ******商品品牌******
            1.ibm
            2.华硕
            3.宏碁
            4.惠普
            5.戴尔
            6.索尼
            7.联想
            8.苹果
            9.雷神
            """
        )

def select_main():
    """查询商品信息功能"""
    while True:
        Menu.print_select_menu()
        num = input("请选择查询功能序号：")
        if num == "0":
            find_name = input("请输入要查找商品名字：")
            find_name = "%" + find_name + "%"
            result, count = JD().select_single_good(find_name)
            if result is not None:
                print("一共查询到%s条记录" % count)
                for res in result:
                    print(res)
            else:
                print("对不起！您输入的商品不存在...")
        elif num == "1":
            temps, count = JD().select_all_goods()
            print("一共查询到%s个商品" % count)
            for temp in temps:
                print(temp)
        elif num == "2":
            result, count = JD().select_goods_class()
            print("一共查询到%s类商品" % count)
            print(result)
        elif num == "3":
            result, count = JD().select_goods_logo()
            print("一共查询到有%s种品牌" % count)
            print(result)
        elif num == "4":
            break
        else:
            print("输入不正确，请重新输入!")

def add_main():
    """添加商品信息功能"""
    while True:
        Menu.print_add_menu()
        num = input("请选择增加功能序号：")
        if num == "1":
            good_name = input("请输入商品名字：")
            while True:
                Menu.print_goods_cates()
                good_cate = input("请选择商品分类：")
                if good_cate in("1", "2", "3", "4", "5", "6", "7", "8", "9", "10"):
                    good_cate = int(good_cate)
                    break
                else:
                    print("输入不正确，请重新输入！")
            while True:
                Menu.print_goods_brands()
                good_brand = input("请选择商品品牌：")
                if good_brand in("1", "2", "3", "4", "5", "6", "7", "8", "9"):
                    good_brand = int(good_brand)
                    break
                else:
                    print("输入不正确，请重新输入！")
            good_price = float(input("请输入商品价格："))
            JD().add_single_good(good_name, good_cate, good_brand, good_price)
        elif num == "2":
            break
        else:
            print("输入错误，请重新输入！")

def update_main():
    """修改商品信息功能"""
    while True:
        Menu.print_update_menu()
        num = input("请选择修改功能序号：")
        if num == "1":
            ids = list()
            for data in JD().get_goods_ids():
                for id in data:
                    ids.append(id)
            good_id_name = input("请输入要修改商品的编号或名字：")
            try:
                if int(good_id_name) in ids:
                    # 表示输入了正确的商品编号
                    JD().update_single_good(0, good_id_name)  # 0表示用户输入的是商品编号,否则表示商品名字
                else:
                    while True:
                        new_id = input("您输入的商品编号不存在，请重新输入：")
                        if int(new_id) in ids:
                            break
                    JD().update_single_good(0, new_id)
            except Exception as e:
                JD().update_single_good(e, good_id_name)
        elif num == "2":
            break
        else:
            print("输入错误，请重新输入！")

def delete_main():
    """删除商品信息功能"""
    while True:
        Menu.print_delete_menu()
        num = input("请选择删除功能序号：")
        if num == "1":
            ids = list()
            for data in JD().get_goods_ids():
                for id in data:
                    ids.append(id)
            print("所有商品信息如下：")
            for good in JD().get_goods_id_name():
                print(good)
            while True:
                good_id = input("请输入要删除的商品编号：")
                try:
                    if int(good_id) in ids:
                        JD().delete_single_good(good_id)
                        break
                    else:
                        print("您输入的商品编号不存在，请重新输入：")
                except Exception as e:
                    print("非法输入", e)

        elif num == "2":
            temps, count = JD().select_all_goods()
            print("一共有%s种商品信息" % count)
            for temp in temps:
                print(temp)
            num = input("1.点错了 2.继续删除：")
            if num == "1":
                break
            elif num == "2":
                s = input("数据删除后将无法恢复，确认请输入y：").lower()
                if s == "y":
                    JD().delete_all_goods()
            else:
                print("输入错误，操作取消中....")
                time.sleep(1)
                break
        elif num == "3":
            break
        else:
            print("输入错误，请重新输入！")

def main():
    """主功能菜单"""
    while True:
        Menu.print_main_menu()
        num = input("请选择功能序号：")
        if num == "1":
            select_main()
        elif num == "2":
            add_main()
        elif num == "3":
            update_main()
        elif num == "4":
            delete_main()
        elif num == "5":
            JD().close_database()
            print("程序正在退出，请稍候....")
            time.sleep(2)
            break
        else:
            print("您的输入不正确，请重新输入！")

if __name__ == '__main__':
    main()