Python如何连上Mysql实现图书借阅系统

发布时间：2023-07-17 14:42:02 所属栏目：MySql教程来源：

导读：本篇内容主要讲解“Python如何连接Mysql实现图书借阅系统”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“Python如何连接Mysql实现图书借阅系统&rdqu

本篇内容主要讲解“Python如何连接Mysql实现图书借阅系统”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“Python如何连接Mysql实现图书借阅系统”吧!

数据库的表结构

我们在这里需要三张表，一张用户表，一张图书表和一张借阅表。注意我们的数据库命名为bbs（book borrow system）

1.用户表

2.图书表

bookname:书名

author：作者

booknum：图书编号

bookpress:出版社

bookamoun:图书数量

3.借阅表

id:借阅号

borrowname:借阅人

borrowbook:借阅图书

bookid:图书编号同图书表booknum

borrowamoun:借阅数量

borrowdate:借阅日期

borrowback:归还日期

Python程序

1.主程序：图书借阅系统.py

# _*_ coding:utf-8 _*_

import pymysql

import db_event

import book_manage

while True:

    print("欢迎使用图书借阅系统\

          [1]登陆 [2]注册 [3]退出")

    choice = int(input("请输入您要进行的操作（数字）："))

    if choice == 1:

        name = input("请输入用户名：")

        login_status=db_event.user_login(name)

        if login_status==1:

            book_manage.manage(name)

        else:

            print("登陆失败")

            continue

    elif choice==2:

        create_user = db_event.user_create()

        print("用户创建成功，您创建的用户信息如下：/n\

              姓名：%s 年龄：%d 性别：%s 密码：%s" % (create_user[0], create_user[1], create_user[2], create_user[3]))

    elif choice==3:

        exit()

    else:

        print("无效操作！")

        continue

2.图书的管理信息：book_manage.py

import db_event

def manage(name):

    while True:

        print("欢迎进入图书系统\n\

    [1]查询图书 [2] 借阅图书 [3]捐赠图书 [4]归还图书 [5]退出")

        num = int(input('输入您的选择：'))

        if num == 1:

            db_event.book_select()

        elif num == 2 :

            chos=int(input("请选择[1]借阅 [2]续借 [3]查询借阅信息 [4]退出"))

            if chos==1:

                db_event.book_borrow(name)

            elif chos==2:

                db_event.borrow_again()

            elif chos==3:

                db_event.borrow_info_select(name)

            elif chos==4:

                continue

            else:

                print("无效操作")

        elif num == 3 :

            db_event.book_juanzeng()

        elif num == 4 :

            db_event.book_back()

        elif num == 5 :

            break

        else:

            print("无效输入！")

3.数据库的操作:db_event.py

# _*_ coding:utf-8 _*_

import pymysql

import random

import string

def user_login(name):

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    sql = "SELECT name,mima FROM user WHERE name='%s'" %(name)

    cursor.execute(sql)

    results = cursor.fetchall()

    if results:

        res=results[0]

        for i in range(3):

            mima = input("请输入密码：")

            if mima == res[1]:

                print("登陆成功！")

                login_status = 1

                break

            else:

                login_status=0

                print("密码输入不正确!请重新输入")

        # print(login_status)

        if login_status == 1 :

            return login_status

        else:

            print("您已输入错误密码三次，无法登陆图书借阅系统，欢迎下次使用！")

            login_status = 0

            return login_status

    else:

        login_status = 0

        print("您输入的用户不存在！")

        return login_status

    db.close()

#判断是否登陆成功，1为成功，0为不成功

# login_status=user_login()

# if login_status==1:

#     print("ok")

# else:

#     print("no")

#关闭数据库连接

# curcor.close()

# db.close()

def user_create():

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    name=input("请输入姓名：")

    age=int(input("请输入年龄:"))

    sex=input("请输入性别[M]男 [W]女：")

    mima=input("为您的用户设置一个8位数密码：")

    sql = "INSERT INTO user VALUES('%s',%s,'%s','%s')" %(name,age,sex,mima)

    cursor.execute(sql)

    db.commit()

    sql1="SELECT * FROM user WHERE name='%s'" %(name)

    cursor.execute(sql1)

    results=cursor.fetchone()

    return results

    db.close()

#create_user=user_create()

#print("用户创建成功，您创建的用户信息如下：/n\

#     姓名：%s 年龄：%d 性别：%s 密码：%s" %(create_user[0],create_user[1],create_user[2],create_user[3]))

def book_info_select(x,y):

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    sql = "SELECT * FROM book WHERE %s='%s'" %(x,y)

    cursor.execute(sql)

    results=cursor.fetchone()

    if results:

        print("书名：%s 作者：%s 书籍编号：%s 出版社：%s 剩余数量：%d " %(results[0],results[1],results[2],results[3],results[4]))

    else:

        print("没有您所要查询的图书")

    db.close()

def book_select():

    a = int(input("输入您要查询的图书关键信息\

            [1]书名 [2]作者 [3]书籍号 [4]出版社"))

    b=""

    if a == 1 :

        b="bookname"

        name=input("请输入要查询的书名：")

        book_info_select(b,name)

    elif a == 2 :

        b="author"

        auth=input("请输入作者名：")

        book_info_select(b,auth)

    elif a == 3 :

        b="booknum"

        num=input("请输入书籍编号")

        book_info_select(b,num)

    elif   a == 4 :

        b="bookpress"

        press=input("请输入出版社：")

        book_info_select(b,press)

    else:

        print("输入有误")

        book_select()

def gen_code(len=8):

    code_str = string.ascii_letters + string.digits

    return ''.join(random.sample(code_str, len))

def book_add(name,auth,press,amount):

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    num=gen_code()

    sql = "INSERT INTO book VALUES('%s','%s','%s','%s',%s)" %(name,auth,num,press,amount)

    sql1 = "SELECT booknum FROM book"

    cursor.execute(sql1)

    res = cursor.fetchall()

    list=[]

    for i in res :

        list.append(i)

    try:

        while True:

            if num in list:

                gen_code()

            else:

                cursor.execute(sql)

                db.commit()

                print("图书捐赠成功，谢谢您！")

                break

    except:

        print("输入图书数目错误！")

        db.rollback()

    db.close()

def book_update_add(name,auth,press,amount):

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    sql="UPDATE book SET bookamount=bookamount+%s WHERE bookname='%s' AND author='%s' AND bookpress='%s'" %(amount,name,auth,press)

    try:

        cursor.execute(sql)

        db.commit()

        print("图书捐赠成功，谢谢您！")

    except:

        print("输入图书数目错误！")

        db.rollback()

    db.close()

def book_juanzeng():

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    name=input("请输入您要捐赠的图书书名：")

    auth=input("请输入您要捐赠的图书作者：")

    press=input("请输入您要捐赠的图书的出版社：")

    amount = int(input("输入您要捐赠的数目："))

    sql = "SELECT * FROM book WHERE bookname='%s'AND author='%s' AND bookpress='%s'" %(name,auth,press)

    cursor.execute(sql)

    results=cursor.fetchone()

    if results:

        book_update_add(name,auth,press,amount)

    else:

        book_add(name,auth,press,amount)

    db.close()

def book_if_borrow(booknum,amount):

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    sql = "SELECT bookamount FROM book WHERE booknum='%s'" %(booknum)

    cursor.execute(sql)

    res = cursor.fetchall()

    if res:

        if res[0][0] >= amount :

    #编号为booknum的书的数量还有，可以借

            return True

        else:

            print("您所需要的编号为%s的书籍当前图书馆只有%d本，不满足您的需求" %(booknum,res[0][0]))

            return False

    else:

        print("查无此书，请确认您的书籍编号！")

        return False

    db.close()

def book_borrow_after(amount,booknum):

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    sql = "UPDATE book SET bookamount=bookamount-%s WHERE booknum='%s'" %(amount,booknum)

    cursor.execute(sql)

    db.commit()

    db.close()

def borrow_add(name,booknum,amount):

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    days = int(input("请输入您选择借阅的天数（不可超过365天）："))

    sql = "INSERT INTO borrow VALUES(NULL,'%s',(SELECT bookname FROM book WHERE booknum='%s'),'%s',%s,CURDATE(),DATE_ADD(CURDATE(),INTERVAL %s DAY))" %(name,booknum,booknum,amount,days)

    cursor.execute(sql)

    db.commit()

def select_after_borrow(booknum,name):

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    sql2 = "SELECT * FROM borrow WHERE bookid='%s' AND borrowname='%s'" % (booknum, name)

    cursor.execute(sql2)

    return cursor.fetchall()

def book_borrow(name):

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    booknum=input("请输入您要借阅的图书编号：")

    amount=int(input("请输入您要借阅的书籍个数："))

    sql1 = "SELECT * FROM book WHERE booknum='%s'" % (booknum)

    cursor.execute(sql1)

    result = cursor.fetchone()

    res = book_if_borrow(booknum,amount)

    if res:

        print("您要借阅的书籍书名：%s 作者：%s 书籍编号：%s 出版社: %s 当前剩余：%d本借后剩余：%d本" %(result[0],result[1],result[2],result[3],result[4],result[4]-amount))

        book_borrow_after(amount,booknum)

        #db.commit()

        borrow_add(name,booknum,amount)

        info=select_after_borrow(booknum,name)

        print("以下是您的借阅图书信息，注意借阅号，这将是您还书的凭证！\n\

借阅号：%d 借阅人：%s 借阅图书：%s 图书编号：%s 借阅数量：%d 借阅日期：%s 归还日期：%s" %(info[-1][0],info[-1][1],info[-1][2],info[-1][3],info[-1][4],info[-1][5],info[-1][6]))

        print("借阅成功")

        while True:

            a=int(input("请输入您选择:[1]继续借阅 [2]退出"))

            if a == 1:

                book_borrow(name)

                break

            elif a == 2 :

                break

            else:

                print("无效操作")

    else:

        print("借阅失败")

        while True:

            a=int(input("请输入您选择:[1]继续借阅 [2]退出"))

            if a == 1:

                book_borrow(name)

                break

            elif a == 2 :

                break

            else:

                print("无效操作")

    db.close()

def back_if_over(id):

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    sql = "SELECT * FROM borrow WHERE backdate >= CURDATE() AND id = %s" %(id)

    cursor.execute(sql)

    res=cursor.fetchall()

    if res:

        return True

    else:

        return False

    db.close()

def book_back_update(id):

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    sql = "UPDATE book SET bookamount=bookamount+(SELECT borrowamount FROM borrow WHERE id = %s) WHERE booknum=(SELECT bookid FROM borrow WHERE id = %s)" %(id,id)

    cursor.execute(sql)

    db.commit()

    db.close()

def borrow_back_update(id):

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    sql = "DELETE FROM borrow WHERE id=%s" %(id)

    cursor.execute(sql)

    db.commit()

    db.close()

def book_back():

    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")

    cursor = db.cursor()

    while True:

        id = int(input("请输入您的借阅号："))

        sql1 = "SELECT * FROM borrow WHERE id=%s" %(id)

        cursor.execute(sql1)

        info =cursor.fetchone()

        if info:

            print("以下是您的借阅图书信息，注意借阅号，这将是您还书的凭证！\n\

借阅号：%d 借阅人：%s 借阅图书：%s 图书编号：%s 借阅数量：%d 借阅日期：%s 归还日期：%s" % (info[0], info[1], info[2], info[3], info[4], info[5], info[6]))

            choice=int(input("请确认您的归还借书信息：[1]确认 [2]返回 [3]退出"))

            if choice == 1 :

                #判断是否逾期：

                if back_if_over(id):

                    book_back_update(id)

                    borrow_back_update(id)

                    print("还书成功")

                    break

                else:

                    print("您已逾期，请联系管理员！")

                    break

            elif choice == 2:

                continue

            elif choice == 3 :

                break

            else:

                print("无效输入")

        else:

            print("请输入正确的借阅号")

def borrow_info_again(id,day):

    db = pymysql.connect("localhost", "ljz&qu

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