作业作业：GUI程序设计--班级信息收集系

import tkinter as tk  
from tkinter import messagebox  
import sqlite3  
import pandas as pd  
  
# 连接到SQLite数据库  
def connect_to_db():  
    conn = sqlite3.connect('students.db')  
    cursor = conn.cursor()  
    return conn, cursor  
  
# 从Excel文件读取数据并导入到SQLite数据库  
def import_data_from_excel():  
    try:  
        df = pd.read_excel('students.xlsx', sheet_name='Sheet1')  
        conn, cursor = connect_to_db()  
        df.to_sql('students', conn, if_exists='append', index=False)  
        conn.commit()  
        messagebox.showinfo("Success", "Data imported successfully!")  
    except FileNotFoundError:  
        messagebox.showerror("Error", "The file students.xlsx does not exist.")  
    except Exception as e:  
        messagebox.showerror("