pymysql實現的簡單學生信息管理

import pymysql.cursors
import datetime

class Experiment5:
    def __init__(self):
        self.connect = pymysql.Connect(
            host='localhost',
            port=3306,
            user='root',
            passwd='',
            db='TT',
            charset='utf8'
        )
        self.cursor = self.connect.cursor()

    def delete(self):
        try:
            try:
                id = int(input("請輸入要刪除的id序號："))
            except:
                print("輸入非法")
                return
            sql = "delete from student where sno=%d" % id
            print(sql)
            self.cursor.execute(sql)
            self.connect.commit()
            print('成功刪除', self.cursor.rowcount, '條數據')
        except Exception as e:
            # print(str(e))
            print("不存在該數據")

    def add(self):
        try:
            sql = "INSERT INTO student (sname, sex, sage) VALUES ('%s','%s','%s' )"
            sname = input("名字：")
            sex = input("性別：")
            sage = input("年齡：")
            data = (sname, sex, sage)
            self.cursor.execute(sql % data)
            self.connect.commit()
            print('成功插入', self.cursor.rowcount, '條數據')
            print()
        except:
            print("存在約束條件！無法插入！")

    def update(self):
        self.showAll()
        try:
            try:
                id = int(input("請輸入要修改的id序號："))
            except:
                print("輸入非法")
                return
            sql = "update student set sname='%s',sage=%d,sex='%s' where sno=%d"
            sname = input("名字：")
            sex = input("性別：")
            try:
                sage = int(input("年齡："))
            except:
                print("輸入非法")
                return
            data = (sname, sage, sex, id)
            self.cursor.execute(sql % data)
            self.connect.commit()
            print('成功修改', self.cursor.rowcount, '條數據')
        except Exception as e:
            # print(str(e))
            print("修改失敗！")

    def showAll(self):
        try:
            sql = "select * from student"
            self.cursor.execute(sql)
            self.connect.commit()
            for row in self.cursor.fetchall():
                print("編號：%d\t學生姓名:%s\t年齡:%d\t性別:%s" % row)
            print('共查找出', self.cursor.rowcount, '條數據')
            print()
        except Exception as e:
            # print(str(e))
            print("不存在該數據！")

    def query(self):
        try:
            query = input("查詢條件：(姓名='1');(年齡>1);(性別='男')")
            query=query.replace("姓名","sname")
            query=query.replace("年齡","sage")
            query=query.replace("性別","sex")
            queries = query.split(";")
            query = " and ".join(queries)
            sql = "select * from student where "+query
            print(sql)
            self.cursor.execute(sql)
            self.connect.commit()
            for row in self.cursor.fetchall():
                print("編號：%d\t學生姓名:%s\t年齡:%d\t性別:%s" % row)
            print('共查找出', self.cursor.rowcount, '條數據')
            print()
        except Exception as e:
            print(str(e))
            print("輸入條件錯誤！")