python连接mysql数据库实例demo(银行管理系统数据库版)

主函数:

import adminView
import os
import pickle
from bankFunction import BankFunction
import time

def main():
    # pass
    # 欢迎界面
    adminView.welcomeView()
    if adminView.loginView() == 1:
        pass
    adminView.functionView()

    bank = BankFunction({})

    while True:
        number = input("请输入您要选择的功能编号: ")
        if number == "":
            bank.createUser()
        elif number == "":  # 查询
            bank.questUser()
        elif number == "":  # 存款
            bank.saveMoney()
        elif number == "":  # 取款
            bank.getMoney()
        elif number == "":  # 转账
            bank.transferMoney()
        elif number == "":  # 改密码
            bank.editPasswd()
        elif number == "":  # 锁卡
            bank.lockCard()
        elif number == "":  # 解锁
            bank.unlockCard()
        elif number == "":  # 补卡
            bank.fillCard()
        elif number == "":  # 销户
            bank.killCard()
        elif number == "q":
            print("正在推出系统,请稍后......")
            time.sleep(2)
            print("退出成功")
            break
        else:
            print("您输入的数字有误,请重新输入")

def test():
    adminView.welcomeView()
    adminView.loginView()
    adminView.functionView()

if __name__ == '__main__':
    main()
    # test()

调用数据库的部分:

"""
类:bankFunction 银行对象
属性:银行功能
"""
import random
import adminView
import pymysql

global db
db = pymysql.connect(
    host='localhost',
    port=3306,
    user='root',
    password='caiyishuai',
    db='bank',
    charset='utf8mb4'
)
global cursor
cursor = db.cursor()

class BankFunction(object):
    def __init__(self, dictUser):
        self.dictUser = dictUser

    # 开户
    def createUser(self):
        # 请输入您的姓名
        name = input("请输入您的姓名: ")
        # 请输入您的身份证号码
        idCard = input("请输入您的身份证号码: ")
        # 请输入您的电话号码
        phone = input("请输入您的电话号码: ")
        cardNumber = self.createCardNumber()
        passwd = self.setPasswd()
        if passwd == -1:
            print("创建失败")
            return -1
        # 设置金额:钱
        money = float(input("请输入您想存入的金额: "))
        # 目的:创建一个user,并且保存字典(数据库)
        sql = "INSERT INTO user VALUES(%s,%s,%s,%s)"
        cursor.execute(sql, (name, idCard, phone, cardNumber))
        db.commit()  # 提交数据
        sql = "INSERT INTO card VALUES(%s,%s,%s,%s)"
        cursor.execute(sql, (cardNumber, passwd, money, 1))
        db.commit()  # 提交数据
        print("%s,你好,你的卡号是 %s" % (name, cardNumber))

    # 设置密码
    def setPasswd(self):
        for i in range(3):
            passwd1 = input("请输入您的密码: ")
            passwd2 = input("请再次输入您的密码: ")
            if passwd1 == passwd2:
                return passwd1
            if i == 2:
                return -1
            print("对不起,您两次输入的密码不相同,请重新输入")

    # 随机生成卡号
    def createCardNumber(self):
        while True:
            cardNumber = ""
            for i in range(6):
                cardNumber += str(random.randrange(0, 10))
            cursor.execute("SELECT * FROM card where cardNumber = '%s' " % cardNumber)
            card = cursor.fetchone()
            print("card", card)
            if card is None:
                return cardNumber
        print(cardNumber)

    # 查询
    def questUser(self):
        cardNumber = input("请输入您的卡号: ")
        # 使用execute()方法执行SQL语句
        cursor.execute("SELECT * FROM card where cardNumber=  '%s' " % cardNumber)
        # 使用fetall()获取全部数据
        card = cursor.fetchone()
        # 打印获取到的数据
        # print(card)

        if card is None:
            print("对不起,您输入的卡号不存在!")
        elif card[3]=='':
            print("对不起,您的卡已被锁定")
        else:
            cursor.execute("SELECT * FROM user where cardNumber='%s' " % cardNumber)
            data = cursor.fetchall()[0]
            print(data[0], "您好!")
            for i in range(3):
                pswd = input("请输入您的密码: ")
                if pswd == card[1]:
                    print("您有金额: ", card[2])
                    break
                else:
                    print("对不起,您输入的密码错误")
                if i == 2:
                    print("非法用户!强制退出!")

    # 存款
    def saveMoney(self):
        print('输入账号')
        cardNumber = input("请输入您的卡号：")
        cursor.execute("SELECT * FROM card where cardNumber=  '%s' " % cardNumber)
        card = cursor.fetchone()
        if card is None:
            print("您输入的卡号有误,请重新输入:")
            return -1
        # 获得卡
        cursor.execute("SELECT * FROM user where cardNumber='%s' " % cardNumber)
        data = cursor.fetchall()[0]
        print(data[0], "您好!")
        if card[3] == '':
            print("你的卡被锁了,不能存款")
            return -1
        res = self.checkPwd(cardNumber)
        if res == -1:  # 密码输入错误次数过多
            card[3] = ''
            return -1
        savemoney = float(input("请输入您要存入的金额："))
        money = str(float(card[2]) + savemoney)
        cursor.execute("UPDATE card SET money = '%s' WHERE cardNumber = '%s' " % (money,cardNumber))
        db.commit()
        # 提示消息
        print("存款成功，您当前用户可用余额为：%s元" % (money))

    # 取款
    def getMoney(self):
        # 输入账号
        cardNumber = input("请输入您的卡号：")
        cursor.execute("SELECT * FROM card where cardNumber=  '%s' " % cardNumber)
        card = cursor.fetchone()
        if card is None:
            print("您输入的卡号有误,请重新输入:")
            return -1
        # 获得卡
        cursor.execute("SELECT * FROM user where cardNumber='%s' " % cardNumber)
        data = cursor.fetchall()[0]
        print(data[0], "您好!")
        if card[3] == '':
            print("你的卡被锁了,不能存款")
            return -1
        res = self.checkPwd(cardNumber)
        if res == -1:  # 密码输入错误次数过多
            card[3] = ''
            return -1

        getmoney = float(input("请输入您要取出的金额："))
        if getmoney > float(card[2]):
            print("对不起，您的余额当前余额为%s元，余额不足！！！" % float(card[2]))
            return -1
        else:
            card_money = str(float(card[2]) - getmoney)
            cursor.execute("UPDATE card SET money = '%s' WHERE cardNumber = '%s' " % (card_money,cardNumber))
            db.commit()
            print("取款成功，您当前用户可用余额为：%s元" % (card_money))

    # 转账
    def transferMoney(self):
        cardNumber = input("请输入您的卡号：")
        cursor.execute("SELECT * FROM card where cardNumber=  '%s' " % cardNumber)
        card = cursor.fetchone()
        if card is None:
            print("您输入的卡号有误,请重新输入:")
            return -1
        elif card[3] == '':
            print("你的卡被锁了,不能存款")
            return -1
        else:
            cursor.execute("SELECT * FROM user where cardNumber='%s' " % cardNumber)
            data = cursor.fetchall()[0]
            print(data[0], "您好!")
            for i in range(3):
                pswd = input("请输入您的密码: ")
                # 密码输入正确
                if pswd == card[1]:
                    # 你有的钱
                    have_money = float(card[2])
                    print("您有金额: ", have_money)
                    cardNumber2 = input("请输入您要转账的卡号: ")
                    cursor.execute("SELECT * FROM card where cardNumber=  '%s' " % cardNumber2)
                    card2 = cursor.fetchone()
                    if card2 is None:
                        print("对不起,您输入的卡号不存在!")
                    elif card2[3] == '':
                        print("此人的卡被锁了,不能转账")
                    else:
                        while True:
                            turn_money = float(input("请输入您要转的金额: "))
                            if turn_money > have_money:
                                print("对不起,您没有那么多钱,请重新输入")
                            else:
                                your_card_money =str( float(card[2])-turn_money)
                                his_card_money =str( float( card2[2])+turn_money)
                                cursor.execute("UPDATE card SET money = '%s' WHERE cardNumber = '%s' " % (your_card_money,cardNumber))
                                db.commit()
                                cursor.execute("UPDATE card SET money = '%s' WHERE cardNumber = '%s' " % (his_card_money,cardNumber2))
                                db.commit()
                                print("恭喜你转账成功,你还有", your_card_money, "元")
                                break
                    break
                else:
                    print("对不起,您输入的密码错误")
                if i == 2:
                    print("非法用户!强制退出!")

    def checkPwd(self, cardNumber):
        cursor.execute("SELECT * FROM card where cardNumber=  '%s' " % cardNumber)
        card = cursor.fetchone()
        card_p = card[1]
        for i in range(3):  # 最多验证3次
            Pwd = input("请输入您的密码:")
            if Pwd == card_p:
                return 0  # 表示密码输入正确
            if i == 2:
                return -1  # 3次输入密码错误
            print("您的密码输入不正确，请重新输入：")

    # 改密
    def editPasswd(self):
        cardNumber = input("请输入您的卡号：")
        cursor.execute("SELECT * FROM card where cardNumber=  '%s' " % cardNumber)
        card = cursor.fetchone()
        if card is None:
            print("您输入的卡号有误,请重新输入:")
        else:
            cursor.execute("SELECT * FROM user where cardNumber='%s' " % cardNumber)
            data = cursor.fetchall()[0]
            print(data[0], "您好!")
            for i in range(3):
                pswd = input("请输入您的密码: ")
                if pswd == card[1]:
                    print("您有金额: ", card[2])
                    while True:
                        new_passwd1 = input("请输入您新密码: ")
                        new_passwd2 = input("请再次输入您新密码: ")
                        if new_passwd1 != new_passwd2:
                            print("对不起,您两次输入的新密码不同,请重新输入!")
                        else:
                            cursor.execute("UPDATE card SET passwd = '%s' WHERE cardNumber = '%s' " % (new_passwd1,cardNumber))
                            db.commit()
                            print("恭喜你!改密成功!")
                            break
                    break
                else:
                    print("对不起,您输入的密码错误")
                if i == 2:
                    print("非法用户!强制退出!")

    # 锁卡
    def lockCard(self):
        cardNumber = input("请输入您的卡号：")
        cursor.execute("SELECT * FROM card where cardNumber=  '%s' " % cardNumber)
        card = cursor.fetchone()
        if card is None:
            print("您输入的卡号有误,请重新输入:")
            return -1
        res = self.checkPwd(cardNumber)
        if res == -1:  # 密码输入错误次数过多
            card[3] = ''
            return -1
        flag = input("请问您确认锁卡吗？（YSE/NO）")
        if flag == "YES":
            cursor.execute("UPDATE card SET isLock = '%s' WHERE cardNumber = '%s' " % ('',cardNumber))
            db.commit()
            print("您的账号已成功锁定")
        else:
            return

    # 解锁
    def unlockCard(self):
        cardNumber = input("请输入您的卡号：")
        cursor.execute("SELECT * FROM card where cardNumber=  '%s' " % cardNumber)
        card = cursor.fetchone()
        if card is None:
            print("您输入的卡号有误,请重新输入:")
            return -1
        res = self.checkPwd(cardNumber)
        if res == -1:  # 密码输入错误次数过多
            card[3] = ''
            return -1
        cursor.execute("UPDATE card SET isLock = '%s' WHERE cardNumber = '%s' " % ('',cardNumber))
        db.commit()
        print("您的账号已成功解锁")

    # 补卡
    def fillCard(self):
        cardNumber = input("请输入您的卡号：")
        cursor.execute("SELECT * FROM card where cardNumber=  '%s' " % cardNumber)
        card = cursor.fetchone()
        if card is None:
            print("您输入的卡号有误,请重新输入:")
            return -1
        res = self.checkPwd(cardNumber)
        if res == -1:  # 密码输入错误次数过多
            card[3] = ''
            return -1
        if input("是否确认补卡号为:%s的账户(y/n)" % cardNumber) == "y":
            new = self.createCardNumber()
            cursor.execute("UPDATE card SET cardNumber = '%s' WHERE cardNumber = '%s' " % (new,cardNumber))
            db.commit()
            cursor.execute("UPDATE user SET cardNumber = '%s' WHERE cardNumber = '%s' " % (new,cardNumber))
            db.commit()
            print("补卡成功,新卡号为%s,即将返回功能选择页面" % new)
            return 0  # 表示补卡成功

    # 销户
    def killCard(self):
        cardNumber = input("请输入您的卡号：")
        cursor.execute("SELECT * FROM card where cardNumber=  '%s' " % cardNumber)
        card = cursor.fetchone()
        if card is None:
            print("您输入的卡号有误,请重新输入:")
            return -1
        res = self.checkPwd(cardNumber)
        if res == -1:  # 密码输入错误次数过多
            card[3] = ''
            return -1
        if input("是否确认注销卡号为:%s的账户(y/n)" % cardNumber) == "y":
            sql = "DELETE FROM card WHERE cardNumber = %s"
            cursor.execute(sql, (cardNumber))
            db.commit()  # 提交数据
            sql = "DELETE FROM user WHERE cardNumber = %s"
            cursor.execute(sql, (cardNumber))
            db.commit()  # 提交数据
            print("销户成功,已注销账户:%s,即将返回功能选择页面" % cardNumber)
            return 0  # 表示销户成功

数据库部分:

设计思路(部分):