MysqlHelper.py文件

import pymysql
class MysqlHelper:
    def __init__(self, host, port, db, user, passwd, charset='utf8'):
        self.host = host
        self.port = port
        self.db = db
        self.user = user
        self.passwd = passwd
        self.charset = charset

    def open(self):
        self.conn = pymysql.connect(host=self.host, port=self.port, db=self.db, user=self.user, passwd=self.passwd, charset=self.charset)
        self.cursor = self.conn.cursor()

    def close(self):
        self.cursor.close()
        self.conn.close()

    def cud(self, sql, params):
        try:
            self.open()
            self.cursor.execute(sql, params)
            self.conn.commit()
            self.close()
            print('ok')
        except Exception as e:
            print("错误信息：%s"%e)

    def all(self, sql, params):
        try:
            self.open()
            self.cursor.excute(sql, params)
            result = self.cursor.fetchall()
            self.close()
            return result
        except Exception as e:
            print(e)

from MysqlHelper import MysqlHelper
#修改
name = input("请输入姓名")
id1 = input("输入考生编号")
sql = 'update students set name=%s where id=%s'
params=[name,id1]
sqlhelper = MysqlHelper('localhost', 3306, 'epoque', 'root', 'xjx')
sqlhelper.cud(sql, params)

from MysqlHelper import MysqlHelper
from hashlib import sha1

name = input("请输入用户名：")
pwd = input("请输入密码：")
s1 = sha1()
s1.update(pwd.encode("utf-8"))
pwd2 = s1.hexdigest()

print("_______________")
print(pwd2)
#根据用户名查询密码

sql = 'select passwd from users where name=%s'
helper = MysqlHelper('localhost', 3306, 'epoque', 'root', 'xjx')
result = helper.all(sql, [name])
if len(result)==0:
    print('用户名错误')
elif result[0][0]== pwd2:
    print("登陆成功")
else:
    print("密码错误")
print(result)