Python連接Mysql實現圖書借閱系統
相信大傢在學習python編程時絕對離不開數據庫的連接，那麼我們就用python來連接數據庫實現一個簡單的圖書借閱系統。其實也很簡單，就是在我們的程序中加入sql語句即可
數據庫的表結構
我們在這裡需要三張表，一張用戶表，一張圖書表和一張借閱表。註意我們的數據庫命名為bbs（book borrow system）
1.用戶表
2.圖書表
bookname:書名
author：作者
booknum：圖書編號
bookpress:出版社
bookamoun:圖書數量
3.借閱表
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程序
1.主程序：圖書借閱系統.py
# _*_ coding:utf-8 _*_
import pymysql
import db_event
import book_manage
while True:
print("歡迎使用圖書借閱系統\
[1]登陸 [2]註冊 [3]退出")
choice = int(input("請輸入您要進行的操作（數字）："))
if choice == 1:
name = input("請輸入用戶名：")
login_status=db_event.user_login(name)
if login_status==1:
book_manage.manage(name)
else:
print("登陸失敗")
continue
elif choice==2:
create_user = db_event.user_create()
print("用戶創建成功，您創建的用戶信息如下：/n\
姓名：%s 年齡：%d 性別：%s 密碼：%s" % (create_user[0], create_user[1], create_user[2], create_user[3]))
elif choice==3:
exit()
else:
print("無效操作！")
continue
2.圖書的管理信息：book_manage.py
import db_event
def manage(name):
while True:
print("歡迎進入圖書系統\n\
[1]查詢圖書 [2] 借閱圖書 [3]捐贈圖書 [4]歸還圖書 [5]退出")
num = int(input('輸入您的選擇：'))
if num == 1:
db_event.book_select()
elif num == 2 :
chos=int(input("請選擇[1]借閱 [2]續借 [3]查詢借閱信息 [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("無效操作")
elif num == 3 :
db_event.book_juanzeng()
elif num == 4 :
db_event.book_back()
elif num == 5 :
break
else:
print("無效輸入！")
3.數據庫的操作: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("請輸入密碼：")
if mima == res[1]:
print("登陸成功！")
login_status = 1
break
else:
login_status=0
print("密碼輸入不正確!請重新輸入")
# print(login_status)
if login_status == 1 :
return login_status
else:
print("您已輸入錯誤密碼三次，無法登陸圖書借閱系統，歡迎下次使用！")
login_status = 0
return login_status
else:
login_status = 0
print("您輸入的用戶不存在！")
return login_status
db.close()
#判斷是否登陸成功，1為成功，0為不成功
# login_status=user_login()
# if login_status==1:
# print("ok")
# else:
# print("no")
#關閉數據庫連接
# curcor.close()
# db.close()
def user_create():
db = pymysql.connect("localhost", "ljz", "redhat", "bbs")
cursor = db.cursor()
name=input("請輸入姓名：")
age=int(input("請輸入年齡:"))
sex=input("請輸入性別[M]男 [W]女 ：")
mima=input("為您的用戶設置一個8位數密碼：")
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("用戶創建成功，您創建的用戶信息如下：/n\
# 姓名：%s 年齡：%d 性別：%s 密碼：%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("書名：%s 作者：%s 書籍編號：%s 出版社：%s 剩餘數量：%d " %(results[0],results[1],results[2],results[3],results[4]))
else:
print("沒有您所要查詢的圖書")
db.close()
def book_select():
a = int(input("輸入您要查詢的圖書關鍵信息\
[1]書名 [2]作者 [3]書籍號 [4]出版社"))
b=""
if a == 1 :
b="bookname"
name=input("請輸入要查詢的書名：")
book_info_select(b,name)
elif a == 2 :
b="author"
auth=input("請輸入作者名：")
book_info_select(b,auth)
elif a == 3 :
b="booknum"
num=input("請輸入書籍編號")
book_info_select(b,num)
elif a == 4 :
b="bookpress"
press=input("請輸入出版社：")
book_info_select(b,press)
else:
print("輸入有誤")
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("圖書捐贈成功，謝謝您！")
break
except:
print("輸入圖書數目錯誤！")
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("圖書捐贈成功，謝謝您！")
except:
print("輸入圖書數目錯誤！")
db.rollback()
db.close()
def book_juanzeng():
db = pymysql.connect("localhost", "ljz", "redhat", "bbs")
cursor = db.cursor()
name=input("請輸入您要捐贈的圖書書名：")
auth=input("請輸入您要捐贈的圖書作者：")
press=input("請輸入您要捐贈的圖書的出版社：")
amount = int(input("輸入您要捐贈的數目："))
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 :
#編號為booknum的書的數量還有，可以借
return True
else:
print("您所需要的編號為%s的書籍當前圖書館隻有%d本，不滿足您的需求" %(booknum,res[0][0]))
return False
else:
print("查無此書，請確認您的書籍編號！")
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("請輸入您選擇借閱的天數（不可超過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("請輸入您要借閱的圖書編號：")
amount=int(input("請輸入您要借閱的書籍個數："))
sql1 = "SELECT * FROM book WHERE booknum='%s'" % (booknum)
cursor.execute(sql1)
result = cursor.fetchone()
res = book_if_borrow(booknum,amount)
if res:
print("您要借閱的書籍書名：%s 作者：%s 書籍編號：%s 出版社: %s 當前剩餘：%d本 借後剩餘：%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("以下是您的借閱圖書信息，註意借閱號，這將是您還書的憑證！\n\
借閱號：%d 借閱人：%s 借閱圖書：%s 圖書編號：%s 借閱數量：%d 借閱日期：%s 歸還日期：%s" %(info[-1][0],info[-1][1],info[-1][2],info[-1][3],info[-1][4],info[-1][5],info[-1][6]))
print("借閱成功")
while True:
a=int(input("請輸入您選擇:[1]繼續借閱 [2]退出"))
if a == 1:
book_borrow(name)
break
elif a == 2 :
break
else:
print("無效操作")
else:
print("借閱失敗")
while True:
a=int(input("請輸入您選擇:[1]繼續借閱 [2]退出"))
if a == 1:
book_borrow(name)
break
elif a == 2 :
break
else:
print("無效操作")
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("請輸入您的借閱號："))
sql1 = "SELECT * FROM borrow WHERE id=%s" %(id)
cursor.execute(sql1)
info =cursor.fetchone()
if info:
print("以下是您的借閱圖書信息，註意借閱號，這將是您還書的憑證！\n\
借閱號：%d 借閱人：%s 借閱圖書：%s 圖書編號：%s 借閱數量：%d 借閱日期：%s 歸還日期：%s" % (info[0], info[1], info[2], info[3], info[4], info[5], info[6]))
choice=int(input("請確認您的歸還借書信息：[1]確認 [2]返回 [3]退出"))
if choice == 1 :
#判斷是否逾期：
if back_if_over(id):
book_back_update(id)
borrow_back_update(id)
print("還書成功")
break
else:
print("您已逾期，請聯系管理員！")
break
elif choice == 2:
continue
elif choice == 3 :
break
else:
print("無效輸入")
else:
print("請輸入正確的借閱號")
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("以下是您的借閱圖書信息:\n\
借閱號：%d 借閱人：%s 續借天數：%d 借閱圖書：%s 圖書編號：%s 借閱數量：%d 初始借閱日期：%s 歸還日期：%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("請輸入您的續借天數（不超過31天）:"))
if a > 31 :
print("您的借閱天數已超過系統權限，如要借閱，請聯系管理員！")
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("輸入您的借閱號："))
if back_if_over(id):
day=borrow_update_again(id)
borrow_info_again(id,day)
print("續借成功")
else:
print("您已逾期，請先聯系管理員再進行操作，謝謝！")
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條借閱圖書信息:\n\
借閱號：%d 借閱人：%s 借閱圖書：%s 圖書編號：%s 借閱數量：%d 借閱日期：%s 歸還日期：%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("您沒有借閱圖書")
db.close()
最後小編想說的是我在這裡沒有加入圖形化或者web，如果有人有興趣繼續做下去的話可以添加自己喜歡的東西，希望對大傢有幫助。
以上就是本文的全部內容，希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。
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