数据库课设--基于Python+MySQL的餐厅点餐系统

一、系统需求分析

需求分析首先要确定研究分析的对象，这里的需求分析对象有两方：买家和卖家。

对于买家，需求是能够进行线上点餐，具体可以细化为：能够在线上获得餐品信息和进行点餐行为。买家作为消费者，都想得到更为优质的服务体验，希望能够通过较为简单顺利的操作就可以吃到满足自己口味的菜肴。这就要求系统界面能够生动形象地有效呈现出点餐的各项信息，菜品的价格，可以选择就坐的餐桌的数目等情况以及加餐时简洁的操作界面。

对于卖家，需求是能够对菜品进行增查删改以及增加会员，具体可以细化为，能够线上获得全部的菜品信息，添加菜品，修改菜品价格，删除菜品，增加会员。卖家即为商家，商家要能够高效地获取这些的信息，当然是图形化界面和几何形式的信息呈现最为直接明了。

二、系统设计

1. 功能结构设计

2、概念设计

2.2.1 bill_food表E-R图

2.2.2 bills表E-R图

2.2.3 categories E-R图

2.2.4 discounts表 E-R图

2.2.5 emp表E-R图

2.2.6 food 表E-R图

2.2.7 member表E-R图

2.2.8 member_point_bill表E-R图

2.2.9 servers表E-R图

2.2.10 tables表E-R图

2.2.11 user表E-R图

3. 逻辑设计（表的设计）

①bill_food表

CREATE TABLE `bill_food` (
  `id_food` int NOT NULL,
  `id_bill` int NOT NULL,
  `num` int NOT NULL,
  PRIMARY KEY (`id_food`,`id_bill`),
  KEY `FK_bill_food2` (`id_bill`),
  CONSTRAINT `FK_bill_food` FOREIGN KEY (`id_food`) REFERENCES `food` (`id_food`) ON DELETE RESTRICT ON UPDATE RESTRICT,
  CONSTRAINT `FK_bill_food2` FOREIGN KEY (`id_bill`) REFERENCES `bills` (`id_bill`) ON DELETE RESTRICT ON UPDATE RESTRICT
) ;

②bills表

CREATE TABLE `bills` (
  `id_bill` int NOT NULL,
  `id_table` int NOT NULL,
  `id_member` int DEFAULT NULL,
  `time_order` datetime NOT NULL,
  `time_pay` datetime DEFAULT NULL,
  `money` int NOT NULL,
  PRIMARY KEY (`id_bill`),
  KEY `FK_bill_member` (`id_member`),
  KEY `FK_table_bill` (`id_table`),
  KEY `time_order` (`time_order`),
  CONSTRAINT `FK_bill_member` FOREIGN KEY (`id_member`) REFERENCES `member` (`id_member`) ON DELETE RESTRICT ON UPDATE RESTRICT,
  CONSTRAINT `FK_table_bill` FOREIGN KEY (`id_table`) REFERENCES `tables` (`id_table`) ON DELETE RESTRICT ON UPDATE RESTRICT
) ;

③categories表

CREATE TABLE `categories` (
  `category` char(20) NOT NULL,
  PRIMARY KEY (`category`)
);

④discounts表

CREATE TABLE `discounts` (
  `id_discount` int NOT NULL,
  `off_price` int NOT NULL,
  `require_points` int NOT NULL,
  PRIMARY KEY (`id_discount`)
) ;

⑤emp表

CREATE TABLE `emp` (
  `id_emp` int NOT NULL,
  `id_server` int DEFAULT NULL,
  `name_emp` char(20) NOT NULL,
  `sex_emp` char(1) DEFAULT NULL,
  `phone_num` char(11) DEFAULT NULL,
  `position` char(20) DEFAULT NULL,
  PRIMARY KEY (`id_emp`)
);

⑥food表

CREATE TABLE `food` (
  `id_food` int NOT NULL,
  `category` char(20) NOT NULL,
  `name_food` char(20) NOT NULL,
  `introduction` char(100) DEFAULT NULL,
  `price` int NOT NULL,
  `url` char(100) DEFAULT NULL,
  PRIMARY KEY (`id_food`),
  KEY `FK_food_category` (`category`),
  CONSTRAINT `FK_food_category` FOREIGN KEY (`category`) REFERENCES `categories` (`category`) ON DELETE RESTRICT ON UPDATE RESTRICT
) ;

⑦member表

CREATE TABLE `member` (
  `id_member` int NOT NULL,
  `name_member` char(20) DEFAULT NULL,
  `points` int NOT NULL,
  `sex` char(1) DEFAULT NULL,
  `phone_num` char(11) DEFAULT NULL,
  PRIMARY KEY (`id_member`)
) ;

⑧member_point_bills表

CREATE TABLE `member_point_bill` (
  `id_point_bill` int NOT NULL,
  `id_member` int NOT NULL,
  `time_point` datetime NOT NULL,
  `point` int NOT NULL,
  `note` char(20) DEFAULT NULL,
  PRIMARY KEY (`id_point_bill`),
  KEY `FK_member_point_bill` (`id_member`),
  CONSTRAINT `FK_member_point_bill` FOREIGN KEY (`id_member`) REFERENCES `member` (`id_member`) ON DELETE RESTRICT ON UPDATE RESTRICT
) ;

⑨servers表

CREATE TABLE `servers` (
  `id_server` int NOT NULL,
  `id_emp` int NOT NULL,
  PRIMARY KEY (`id_server`),
  KEY `FK_to_server` (`id_emp`),
  CONSTRAINT `FK_to_server` FOREIGN KEY (`id_emp`) REFERENCES `emp` (`id_emp`) ON DELETE RESTRICT ON UPDATE RESTRICT
) ;

⑩tables表

CREATE TABLE `tables` (
  `id_table` int NOT NULL,
  `id_server` int NOT NULL,
  `num_people` int NOT NULL,
  `id_bill` int DEFAULT NULL,
  `id_member` int DEFAULT NULL,
  PRIMARY KEY (`id_table`),
  KEY `FK_server_table` (`id_server`),
  CONSTRAINT `FK_server_table` FOREIGN KEY (`id_server`) REFERENCES `servers` (`id_server`) ON DELETE RESTRICT ON UPDATE RESTRICT
) ;

11.user表

CREATE TABLE `user` (
  `user_id` varchar(4) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `user_password` varchar(255) NOT NULL,
  `user_name` varchar(255) DEFAULT NULL,
  `user_position` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`user_id`)
);

三、 系统实现（主要体现以下几部分）

1、系统采用的技术、方法、工具

餐厅点餐系统采用pycharm tkinter库实现可视化，数据库管理用MySQL

2、效果图

其他图就不展示了

3、实现代码

2.1 main.py

def is_number(s):
    try:
        float(s)
        return True
    except ValueError:
        pass

    try:
        import unicodedata
        unicodedata.numeric(s)
        return True
    except (TypeError, ValueError):
        pass

    return False

# window
import tkinter.messagebox
import tkinter as tk  # 使用Tkinter前需要先导入
import order
import statistic
from database import *
import reig_manage

table = db_get_table()

    #实例化
window_table = tk.Tk()
window_table.title('选择餐桌')
window_table.geometry('300x400')
window_table['bg']='#d0c0c0'
listbox_table = tk.Listbox(window_table, listvariable = table)
#listbox_table['bg']='#9ea4b8'
for table_item in table:
    listbox_table.insert("end", table_item+" "+table[table_item][0])

listbox_table.pack()
#
e_member = tk.Entry(window_table, show=None, font=('Arial', 14))
e_member.insert(0,"输入会员号")
e_member['bg']='#f8f0e0'
e_member.pack()

def submit_table():
    if listbox_table.curselection() == ():
        tkinter.messagebox.showinfo(title='警告', message='请点击框内餐桌再选择')
        return
    table_item = listbox_table.get(listbox_table.curselection())
    occupied = table[table_item[0:3]][0]
    if occupied=="占用":
        tkinter.messagebox.showinfo(title='警告', message='当前餐桌有人')
        return
    table_num = int(table_item[2:3])
    next_bill = db_sit(table_num)
    window_table.withdraw()
    member_id = e_member.get()
    if is_number(member_id):
        member_id = int(member_id)
    else:
        member_id = None
    order.open_order_table(table_num,next_bill,member_id)

def enter_statistic():
    #window_table.withdraw()
    statistic.open()

#登录
def enter_manage():
   # window_table.withdraw()

    reig_manage.register_manage()

#打样
def close_shop():
    db_clear_table()
    table = db_get_table()
    listbox_table.delete(0,"end")
    for table_item in table:
        listbox_table.insert("end", table_item+" "+table[table_item][0])

button_select_table = tk.Button(window_table, text='选择', width=15, height=2, command=submit_table)
button_select_table.pack()
button_statistic = tk.Button(window_table, text='进入后台统计界面', width=15, height=2, command=enter_statistic)
button_statistic.pack()
button_statistic = tk.Button(window_table, text='管理人员登录', width=15, height=2, command=enter_manage)
button_statistic.pack()
button_statistic = tk.Button(window_table, text='打烊', width=15, height=2, command=close_shop)
button_statistic.pack()

# 第7步，主窗口循环显示
window_table.mainloop()

2.2 reig_manage.py

import tkinter as tk  # 使用Tkinter前需要先导入
from tkinter import messagebox
from database_manage import *
import manage
from tkinter import *

def register_manage():
    window = tk.Toplevel()
    window.title('后台登录页面')
    window['bg'] = '#d0c0c0'
    window.geometry('300x300')

    Label(window, text='管理人员登录').grid(row=0, column=0, columnspan=2)
    Label(window, text='用户名：').grid(row=1, column=0)
    name = Entry(window)
    name.grid(row=1, column=1)
    Label(window, text='密码：').grid(row=2, column=0, sticky=E)
    passwd = Entry(window, show='*')
    passwd.grid(row=2, column=1)

    def successful():
        falg=db_get_user111(name,passwd)
        if falg==1:
            window.destroy()
            manage.show()
        else:
            messagebox.showerror(title='wrong', message='登录失败，用户名或密码错误')

    Button(window, text='登录', command=successful).grid(row=3, column=0, columnspan=2)

2.3 statistic.py

import tkinter.messagebox
import tkinter as tk  # 使用Tkinter前需要先导入
from database import *

def open():
    # 实例化object，建立窗口window
    window = tk.Toplevel()
    window.title('统计页面')
    window['bg']='#d0c0c0'
    window.geometry('300x500')

    data = []

    # 存放统计结果
    listbox = tk.Listbox(window, listvariable=data)
    # 日期输入框
    e_start = tk.Entry(window, show=None, font=('Arial', 14))
    e_start.insert(0,"起始日期")
    e_end = tk.Entry(window, show=None, font=('Arial', 14))  # 显示成明文形式
    e_end.insert(0,"终止日期")
    label_money = tk.Label(window, width=40, text="时间段内销售总额：空（请点击查询）")

    def get_sales():
        sales = db_get_sales()
        listbox.delete(0,"end")
        for sale in sales:
            listbox.insert("end",sale[0]+" 销售量"+str(sale[1]))

    def get_sales_time():
        start_date = e_start.get()
        end_date = e_end.get()
        try:
            datetime.datetime.strptime(start_date, '%Y-%m-%d')
            datetime.datetime.strptime(end_date, '%Y-%m-%d')
        except ValueError:
            tkinter.messagebox.showinfo(title='警告', message='日期不合法，范例2021-02-03')
            return
        sales = db_get_sales_time(start_date, end_date)
        listbox.delete(0,"end")
        if sales == ():
            tkinter.messagebox.showinfo(title='提示', message='该时间段没有销售')
        for sale in sales:
            listbox.insert("end",sale[0]+" 销售量"+str(sale[1]))

    def get_money_time():
        start_date = e_start.get()
        end_date = e_end.get()
        try:
            datetime.datetime.strptime(start_date, '%Y-%m-%d')
            datetime.datetime.strptime(end_date, '%Y-%m-%d')
        except ValueError:
            tkinter.messagebox.showinfo(title='警告', message='日期不合法，范例2021-02-03')
            return
        money = db_get_money_time(start_date, end_date)
        if money == None:
            tkinter.messagebox.showinfo(title='提示', message='该时间段没有销售')
            return
        label_money.config(text = "时间段内销售总额："+str(money)+"元（点击第三个按钮刷新）")

    button_sales = tk.Button(window, text='按菜品销量排序（总）', width=20, height=2, command=get_sales)
    button_sales_time = tk.Button(window, text='按时间段销量排序', width=20, height=2, command=get_sales_time)
    button_sales_total = tk.Button(window, text='查询某时间段内销售总额', width=20, height=2, command=get_money_time)

    button_sales.pack()
    button_sales_time.pack()
    button_sales_total.pack()

    e_start.pack()
    e_end.pack()
    listbox.pack()
    label_money.pack()
    window.mainloop()

2.4 order.py

import tkinter.messagebox
import tkinter as tk  # 使用Tkinter前需要先导入

import discount
from database import *

food = {}
bills = []
# # bill_id = 0
# member_id = 3
# # server_id = 7
# member_cent = 0
# server_id = 0
food = db_get_all_food()


def open_order_table(table_id,bill_id,member_id):
    print("member_id:"+str(member_id))
    member_point = db_get_member_point(member_id)
    server_id = db_get_server_id(table_id)
    db_get_server_id(table_id)
    # 第1步，实例化object，建立窗口window
    window = tk.Toplevel()
    window['bg']='#d0c0c0'
    window.title('点餐系统')

    window.geometry('300x800')
    #在图形界面上创建一个标签label用以显示并放置
    var = tk.StringVar()  # 定义一个var用来将radiobutton的值和Label的值联系在一起.
    var.set("川菜")
    label_server = tk.Label(window, bg='#b8b0b0', width=20, text=str(server_id)+"号服务员为您服务")
    label_server.pack()
    label_food = tk.Label(window, bg='#b8b0b0', width=20, text="川菜")
    label_food.pack()
    label_order = tk.Label(window, bg='#b8b0b0', width=20, text="订单 " + "0元")
    # 对应菜品的显示
    listbox = tk.Listbox(window, listvariable=food["川菜"])
    for food_item in food[var.get()]:
        listbox.insert("end", food_item)
    listbox_bill = tk.Listbox(window, listvariable=bills)

    # 定义选项触发函数功能
    def print_category():
        #print(var.get())
        label_food.config(text=var.get())
        listbox.delete(0, "end")
        for food_item in food[var.get()]:
            listbox.insert("end", food_item)

    def add_bill(food_item):
        bills.append(food_item)
        bill_money=db_add_bill(bill_id,food_item.split(' ')[0])
        listbox_bill.insert("end", food_item)
        label_order.config(text="订单 " + str(bill_money) + "元")

    def submit_bill():

        listbox_bill.delete(0, "end")
        item_num = 0
        label_order.config(text="订单 " + str(item_num) + "元")
        db_submit_bill(member_id,bill_id)
        window.destroy()
        discount.open(member_point,member_id)

    def submit_food():
        if listbox.curselection() == ():
            tkinter.messagebox.showinfo(title='警告', message='请点击框内菜品才添加')
            return
        print(listbox.curselection())
        food_item = listbox.get(listbox.curselection())
        add_bill(food_item)

        # 创建三个radiobutton选项，其中variable=var, value='A'的意思就是，当我们鼠标选中了其中一个选项，把value的值A放到变量var中，然后赋值给variable
    for category in food:
        radiobutton = tk.Radiobutton(window, text=category, variable=var, value=category, command=print_category)
        radiobutton.pack()

    listbox.pack()
    button_submit = tk.Button(window, text='添加菜品', width=15, height=2, command=submit_food)
    button_submit.pack()

    label_order.pack()
    listbox_bill.pack()
    button_pay = tk.Button(window, text='结账', width=15, height=2, command=submit_bill)
    button_pay.pack()

    label_member_id = tk.Label(window, width=20, text="会员号："+str(member_id))
    label_member_id.pack()
    label_server_id = tk.Label(window, width=20, text="服务员：" + str(server_id))
    label_server_id.pack()
    label_cent = tk.Label(window, width=20, text="积分：" + str(member_point))
    label_cent.pack()
    window.mainloop()

2.5 manage.py

import database_manage
from tkinter import messagebox
#import main
import tkinter as tk  # 使用Tkinter前需要先导入
from database_manage import *
from tkinter import *

def show():

    window = tk.Toplevel()
    window['bg'] = '#d0c0c0'
    window.title('后台页面')
    window.geometry('250x250')

    def inquire_menu():
        window_menu = tk.Toplevel()
        window_menu['bg'] = '#d0c0c0'
        window_menu.title('所有菜品页面')
        window_menu.geometry('220x230')

        food = {}
        food=database_manage.db_get_food()
        var = tk.StringVar()
        listbox = tk.Listbox(window_menu, listvariable=food)
        #listbox.Text(window,wigth=100,height=300)
        listbox.grid(row=0, column=6,ipadx=30,ipady=10,columnspan=5,rowspan=5)
        listbox.insert("end", "id:  "+" 类别： "+" 名称："+" 价格：")
        for food_item in food:
            #listbox.insert("end", food[food_item][0])
            listbox.insert("end", food[food_item][0]+"    "+food[food_item][1]+"    "+food[food_item][2]+"    "+food[food_item][3])


    def add_menu():
        window_add = tk.Toplevel()
        window_add['bg'] = '#d0c0c0'
        window_add.title('添加菜品页面')
        window_add.geometry('300x200')

        Label(window_add, text='id_food').grid(row=1, column=0)
        id = Entry(window_add)
        id.grid(row=1, column=1)
        Label(window_add, text='category').grid(row=2, column=0)
        category = Entry(window_add)
        category.grid(row=2, column=1)

        Label(window_add, text='name').grid(row=3, column=0)
        name = Entry(window_add)
        name.grid(row=3, column=1)
        Label(window_add, text='price').grid(row=4, column=0)
        price = Entry(window_add)
        price.grid(row=4, column=1)



        def add():
            falg=db_get_all_categories(category)
            if(falg==1):
                ret=db_get_add(id,category,name,price)
                if(ret==1):
                    messagebox.showinfo(title='successful', message='添加成功')
                else:
                    messagebox.showinfo(title='失败', message='由于food表的外键约束，不能在pycharm里用语句添加')
            else:
                messagebox.showinfo(title='失败', message='category错误')

        Button(window_add, text='添加', command=add).grid(row=6, column=2, columnspan=2)


    def alter_menu():
        window_alter = tk.Toplevel()
        window_alter['bg'] = '#d0c0c0'
        window_alter.title('修改菜品页面')
        window_alter.geometry('300x200')

        Label(window_alter, text='菜品名称').grid(row=1, column=0)
        name = Entry(window_alter)
        name.grid(row=1, column=1)
        Label(window_alter, text='菜品价格').grid(row=2, column=0)
        price = Entry(window_alter)
        price.grid(row=2, column=1)


        def alters():
            falg = db_alter(name,price)
            if falg == 1:
                messagebox.showinfo(title='successful', message='修改成功')
            else:
                messagebox.showinfo(title='失败', message='修改失败')

        Button(window_alter, text='修改', command=alters).grid(row=6, column=2, columnspan=2)


    def delete_menu():
        window_delete = tk.Toplevel()
        window_delete['bg'] = '#d0c0c0'
        window_delete.title('删除菜品页面')
        window_delete.geometry('300x200')

        Label(window_delete, text='菜品名称').grid(row=1, column=0)
        name = Entry(window_delete)
        name.grid(row=1, column=1)

        def deletes():
            falg = db_delete(name)

            if falg == 1:
                messagebox.showinfo(title='successful', message='删除成功')
            else:
                messagebox.showinfo(title='失败', message='由于food表的外键约束，不能在pycharm里用语句删除')

        Button(window_delete, text='删除', command=deletes).grid(row=6, column=2, columnspan=2)

    def add_member():
        window_addm = tk.Toplevel()
        window_addm['bg'] = '#d0c0c0'
        window_addm.title('增加会员页面')
        window_addm.geometry('300x200')

        Label(window_addm, text='id_member').grid(row=0, column=0)
        member = Entry(window_addm)
        member.grid(row=0, column=1)
        Label(window_addm, text='name').grid(row=1, column=0)
        name = Entry(window_addm)
        name.grid(row=1, column=1)
        Label(window_addm, text='sex').grid(row=2, column=0)
        sex = Entry(window_addm)
        sex.grid(row=2, column=1)
        Label(window_addm, text='phone').grid(row=3, column=0)
        phone = Entry(window_addm)
        phone.grid(row=3, column=1)

        def adds():
            falg = db_add_member(member,name,sex,phone)
            if falg == 1:
                messagebox.showinfo(title='successful', message='增加成功')
            else:
                messagebox.showinfo(title='失败', message='增加失败')

        Button(window_addm, text='增加', command=adds).grid(row=6, column=2, columnspan=2)

    tk.Button(window, text='查询所有菜品', width=15, height=2,command=inquire_menu).grid(row=0, column=1)
    tk.Button(window, text='添加菜品', width=15, height=2,command=add_menu).grid(row=1, column=1)
    tk.Button(window, text='修改菜品价格', width=15, height=2,command=alter_menu).grid(row=2, column=1)
    tk.Button(window, text='删除菜品', width=15, height=2,command=delete_menu).grid(row=3, column=1)
    tk.Button(window, text='增加会员', width=15, height=2, command=add_member).grid(row=4, column=1)
    
    window.mainloop()

2.6 discount.py

import tkinter.messagebox
import tkinter as tk  # 使用Tkinter前需要先导入
from database import *

def open(points,member_id):
    # 第1步，实例化object，建立窗口window
    window = tk.Toplevel()
    # 第2步，给窗口的可视化起名字
    window.title('统计系统')
    # 第3步，设定窗口的大小(长 * 宽)
    window.geometry('300x500')
    window['bg']='#d0c0c0'
    # 优惠
    label_discount = tk.Label(window, bg='#b8b0b0', width=30, text ="选择优惠")
    label_discount.pack()

    # 存放统计结果
    discount = db_get_discountlist()
    print(discount)
    listbox = tk.Listbox(window, listvariable=discount)
    for discount_item in discount:
        if points < discount[discount_item][1]: # 积分不够规则所需
            continue
        off_price = str(discount[discount_item][0])
        require_points = str(discount[discount_item][1])
        listbox.insert("end","花费"+require_points+"积分获得"+off_price+"元优惠" )
    listbox.pack()

    def commit_discount():
        if listbox.curselection() == ():
            tkinter.messagebox.showinfo(title='警告', message='请点击框内优惠才提交')
            return
        db_commit_discount(discount[listbox.curselection()[0]+1][1],member_id)
        cancle()

    def cancle():
        window.destroy()
        tkinter.messagebox.showinfo(title='结账', message='结账成功，欢迎下次再来！')

    # 确认优惠
    button_commit = tk.Button(window, text='使用', width=15, height=2, command=commit_discount)
    button_commit.pack()
    button_cancel = tk.Button(window, text='不使用', width=15, height=2, command=cancle)
    button_cancel.pack()

    window.mainloop()

2.7 database_manage.py

import pymysql


def db_get_user111(name,passwd):
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    try:

        sql = """select user_id,user_password from user"""
        entry1 = name.get()

        entry2 = passwd.get()

        cursor.execute(sql)
        results = cursor.fetchall()

        for row in results:
            uid=row[0]
            pwd=row[1]
            if entry1==uid and entry2==pwd:
                db.close()
                return 1
        return 0
    except:
        db.rollback()
        db.close()
        return 0

def db_get_food():
    db = pymysql.connect(host='localhost', user='root', password='123456', db="restaurant", charset="utf8")
    cursor = db.cursor()
    food = {}
    sql = """select id_food,category,name_food,price from food"""
    try:
        # 执行sql
        cursor.execute(sql)
        # 处理结果集
        results = cursor.fetchall()

        for row in results:
            food[str(row[0])]=[str(row[0]),row[1],row[2],str(row[3])]
        db.close()
        return food
    except Exception as e:
        # print(e)
        print('查询所有数据失败')
        db.rollback()
        db.close()
        return 0


def db_get_all_categories(category):
    # 打开数据库连接
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()

    sql = """select category from categories"""
    try:
        category = category.get()
        cursor.execute(sql)
        results = cursor.fetchall()

        for row in results:
            if category == row[0]:
                return 1
        return 0
    except:
        print("wrong:db_get_all_categories")
        db.rollback()
        db.close()
        return 0


def db_get_add(id,category,name,price):
    db = pymysql.connect(host='localhost', user='root', password='123456', db="restaurant", charset="utf8")
    cursor = db.cursor()


    try:

        sql = """insert into food(id_food,category,name_food,introduction,price,url) values(%s,%s,%s,%s,%s,%s)"""
        value = (id, category, name, 'null', price, 'NULL')
        # 执行sql
        cursor.execute(sql,value)
        db.commit()


        db.close()
        return 1
    except Exception as e:
        print(e)
        db.rollback()
        db.close()
        return 0


def db_alter(name,price):
    db = pymysql.connect(host='localhost', user='root', password='123456', db="restaurant", charset="utf8")
    cursor = db.cursor()
    try:
        price = price.get()
        name = name.get()
        sql = """update food set price = %s where name_food = %s"""
        value = ( price , name )
        # 执行sql
        cursor.execute(sql,value)
        db.commit()

        db.close()
        return 1
    except Exception as e:
        print(e)
        db.rollback()
        db.close()
        return 0


def db_delete(name):
    db = pymysql.connect(host='localhost', user='root', password='123456', db="restaurant", charset="utf8")
    cursor = db.cursor()
    try:
        name = name.get()
        sql = """delete from food where name_food=%s"""
        #value = (name)
        # 执行sql
        cursor.execute(sql, name)
        db.commit()

        db.close()
        return 1
    except Exception as e:
        print(e)
        db.rollback()
        db.close()
        return 0

def db_add_member(member,name,sex,phone):
    db = pymysql.connect(host='localhost', user='root', password='123456', db="restaurant", charset="utf8")
    cursor = db.cursor()
    try:
        member=member.get()
        name = name.get()
        sex=sex.get()
        phone=phone.get()
        sql = """insert into member(id_member,name_member,points,sex,phone_num) values(%s,%s,0,%s,%s) """
        value = (member,name,sex,phone)
        # 执行sql
        cursor.execute(sql, value)
        db.commit()

        db.close()
        return 1
    except Exception as e:
        print(e)
        db.rollback()
        db.close()
        return 0

2.8 database.py

import datetime
#import reig_manage
import pymysql

def db_get_table():
    # 打开数据库连接，创建一个数据库对象
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    sql = """select id_table, id_server, id_bill
                from tables"""
    try:

        tables={}
        cursor.execute(sql) # 执行sql语句
        results = cursor.fetchall()      #获取所有数据
        for row in results:
            print(row)
            occupied = row[2]
            if occupied:
               occupied = "占用"
            else:
                occupied = "空闲"
            server = row[1]
            tables["餐桌"+str(row[0])]=[occupied,server]
        db.close()
        return tables
    except:

        print("wrong:get_table")
        db.rollback()
        db.close()
        return {}


# 找到下一个bill的id返回，并且将其设置成当前选择的table的bill，表示入座
def db_sit(table_num):
    # 打开数据库连接
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    sql = """select max(id_bill)
                    from bills"""

    try:

        max = 0
        cursor.execute(sql)
        results = cursor.fetchall()
        for row in results:
            max = row[0]
        sql2 = """insert into bills(id_bill,id_table,id_member,time_order,money)
                    values(%d,%d,NULL,"%s",0)"""% \
               (max+1,table_num,datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S'))
        cursor.execute(sql2)
        sql3 = """update tables
                set id_bill=%d
                where id_table = %d
                """ % \
               (max+1,table_num)
        cursor.execute(sql3)
        db.commit()   #插入数据
        db.close()
        return max+1
    except:

        print("wrong:db_sit")
        db.rollback()
        db.close()
        return 0


def db_get_server_id(table_id):
    # 打开数据库连接
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    sql = """select id_server
                    from tables
                    where id_table = %d"""%(table_id)
    print(sql)
    try:

        server_id = 0
        cursor.execute(sql)
        results = cursor.fetchall()
        for row in results:
            server_id = row[0]
        db.close()
        return server_id
    except:

        print("wrong:db_get_server_id")
        db.rollback()
        db.close()
        return 0


def db_get_all_food():
    # 打开数据库连接
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    food = {}
    sql = """select category from categories"""
    print(sql)
    try:

        cursor.execute(sql)
        results = cursor.fetchall()
        for row in results:
            food[row[0]]=[]
        sql2 = """select category, name_food, price
                    from food
                """
        cursor.execute(sql2)
        results = cursor.fetchall()
        for row in results:
            food[row[0]].append(row[1]+" "+str(row[2])+"元")
        db.close()
        return food
    except:

        print("wrong:db_get_all_food")
        db.rollback()
        db.close()
        return 0


def db_add_bill(bill_id,food_name):
    # 打开数据库连接
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    food = {}
    try:
        current_money = 0

        sql_find_food_id = """select id_food, price 
                    from food
                    where name_food = "%s" """ %(food_name)
        cursor.execute(sql_find_food_id)
        results = cursor.fetchall()
        for row in results:
            id = row[0]
            price = row[1]
        sql_findexistsfood = """select *
                    from bill_food
                    where id_food = %d and id_bill = %d 
                    """%(id,bill_id)
        cursor.execute(sql_findexistsfood)
        if cursor.fetchall()==():
            sql2 = """insert into bill_food
                        values(%d,%d,1)
                        """%(id,bill_id)
        else:
            sql2 = """update bill_food
                        set num =num +1
                    where id_food = %d and id_bill = %d 
                                    """ % (id, bill_id)
        cursor.execute(sql2)
        sql3 = """update bills
                    set money = money+%d 
                    where id_bill = %d
                            """ % (price, bill_id)
        cursor.execute(sql3)
        db.commit()
        sql4 = """select money
                    from bills
                    where id_bill = %d
                            """ % (bill_id)
        cursor.execute(sql4)
        results = cursor.fetchall()
        for row in results:
            current_money = row[0]
            print(current_money)
            db.close()
            return current_money
    except:

        print("wrong:db_add_bill")
        db.rollback()
        db.close()
        return 0


def db_submit_bill(member_id,id_bill):
    # 打开数据库连接
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    try:

        sql = """update tables
                set id_bill = NULL
                where id_bill = %d"""%(id_bill)
        cursor.execute(sql)
        sql2 = """update bills
                set time_pay = "%s"
                where id_bill = %d"""%(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S'),id_bill)
        cursor.execute(sql2)
        if member_id != None:
            sql3 = """select money
                        from bills
                        where id_bill = %d
                                """ % (id_bill)
            cursor.execute(sql3)
            results = cursor.fetchall()
            for row in results:
                current_money = row[0]
            sql4 = """update member
                        set points = points+ %s
                        where id_member = %d""" % (current_money,member_id)
            cursor.execute(sql4)
        db.commit()
        db.close()
    except:

        print("wrong:db_submit_bill")
        db.rollback()
        db.close()


def db_get_sales():
    # 打开数据库连接
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    try:

        sql = """SELECT name_food, sum(num)
                FROM bill_food natural join food
                group by id_food
                order by sum(num) desc"""
        cursor.execute(sql)
        results = cursor.fetchall()
        db.close()
        return results
    except:

        print("wrong:db_get_sales")
        db.rollback()
        db.close()
        return ()


def db_get_sales_time(start_time, end_time):
    # 打开数据库连接
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    try:

        sql = """SELECT name_food, sum(num)
                FROM bill_food natural join bills natural join food
                where time_pay between "%s 00:00:00" and "%s 00:00:00"
                group by id_food
                order by sum(num) desc;"""%(start_time,end_time)
        cursor.execute(sql)
        results = cursor.fetchall()
        db.close()
        return results
    except:

        print("wrong:db_get_sales_time")
        db.rollback()
        db.close()
        return ()


def db_get_money_time(start_time, end_time):
    # 打开数据库连接
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    try:

        sql = """SELECT sum(money)
                FROM bills
                    where time_pay between "%s 00:00:00" and "%s 00:00:00"
                    """ % (start_time, end_time)
        cursor.execute(sql)
        results = cursor.fetchall()
        for row in results:
            return row[0]
        db.close()
        return 0
    except:

        print("wrong:db_get_money_time")
        db.rollback()
        db.close()
        return 0

def db_clear_table():
    # 打开数据库连接
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    try:

        sql = """update tables
                set id_bill = NULL
                where id_table <> 100"""
        cursor.execute(sql)
        db.commit()
        db.close()
    except:

        print("wrong:db_clear_table")
        db.rollback()
        db.close()


def db_get_member_point(member_id):
    # 打开数据库连接
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    try:
        if member_id == None:
            return 0

        sql = """select points
                    from member
                    where id_member = %s"""%(member_id)
        cursor.execute(sql)
        results = cursor.fetchall()
        if results == ():
            sql2 = """insert into member
                    values(%s,null,0,null,null)""" % (member_id)
            cursor.execute(sql2)
            db.commit()
            db.close()
            return 0
        db.close()
        for row in results:
            return row[0]
    except:

        print("wrong:db_ensure_member_id")
        db.rollback()
        db.close()

def db_get_discountlist():
    # 打开数据库连接
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    discount = {}
    sql = """select * from discounts"""
    print(sql)
    try:

        cursor.execute(sql)
        results = cursor.fetchall()
        for row in results:
            discount[row[0]] = [row[1],row[2]]
        db.close()
        return discount
    except:

        print("wrong:db_get_discountlist")
        db.rollback()
        db.close()
        return 0

def db_commit_discount(points,member_id):
    # 打开数据库连接
    db = pymysql.connect(host="localhost", user="root", password="123456", db="restaurant", charset="utf8")
    # 使用 cursor() 方法创建一个游标对象 cursor
    cursor = db.cursor()
    discount = {}
    sql = """update member
            set points = points - %s
            where id_member = %s"""%(points,member_id)
    try:
        cursor.execute(sql)
        db.commit()
        db.close()
    except:
        print("wrong:db_commit_discount")
        db.rollback()
        db.close()
        return 0

四、源码获取

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