Python怎麼連接Mysql實作圖書借閱系統

PHPz
發布: 2023-04-17 17:28:03
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資料庫的表格結構

我們在這裡需要三張表,一張使用者表,一張圖書表和一張借閱表。注意我們的資料庫命名為bbs(book borrow system)

1.用戶表

Python怎麼連接Mysql實作圖書借閱系統

2.書表

Python怎麼連接Mysql實作圖書借閱系統

bookname:書名
author:作者
booknum:圖書編號
bookpress:出版社
bookamoun:圖書數量

3.借閱表

Python怎麼連接Mysql實作圖書借閱系統

#id:借閱號
borrowname:借閱人
borrowbook:借閱圖書
bookid:圖書編號同圖書表booknum
borrowamoun:借閱數量
borrowdate:借閱日期
borrowback:歸還日期

Python程式

1.主程式:圖書借閱系統.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
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2.圖書的管理資訊: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!")
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3.資料庫的操作: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", "redhat", "bbs")
    cursor = db.cursor()
    sql1 = "SELECT * FROM borrow WHERE id=%s" % (id)
    cursor.execute(sql1)
    info = cursor.fetchone()
    print("以下是您的借阅图书信息:\n\
借阅号:%d 借阅人:%s 续借天数:%d 借阅图书:%s 图书编号:%s 借阅数量:%d 初始借阅日期:%s 归还日期:%s" %(info[0], info[1],day,info[2], info[3], info[4], info[5], info[6]))
    db.close()

def borrow_update_again(id):
    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")
    cursor = db.cursor()
    a=int(input("请输入您的续借天数(不超过31天):"))
    if a > 31 :
        print("您的借阅天数已超过系统权限,如要借阅,请联系管理员!")
    else:
        sql="UPDATE borrow SET backdate=DATE_ADD(backdate,INTERVAL %s DAY) WHERE id=%s" %(a,id)
        cursor.execute(sql)
        db.commit()
        db.close()
    return a

def borrow_again():
    id=int(input("输入您的借阅号:"))
    if back_if_over(id):
        day=borrow_update_again(id)
        borrow_info_again(id,day)
        print("续借成功")
    else:
        print("您已逾期,请先联系管理员再进行操作,谢谢!")

def borrow_info_select(name):
    db = pymysql.connect("localhost", "ljz", "redhat", "bbs")
    cursor = db.cursor()
    sql = "SELECT * FROM borrow WHERE borrowname='%s'" %(name)
    cursor.execute(sql)
    res=cursor.fetchall()
    if res:
        for i in range(len(res)):
            print("以下是您的第%d条借阅图书信息:\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" % (i+1,res[i][0], res[i][1], res[i][2], res[i][3], res[i][4], res[i][5], res[i][6]))
    else:
        print("您没有借阅图书")
    db.close()
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