如何在python tkinter中.get()所有插入到sqlite 3中的输入框

import tkinter as tk
import sqlite3

def save_data():
    # 连接到SQLite数据库
    conn = sqlite3.connect('database.db')
    c = conn.cursor()

    # 创建表格（如果不存在）
    c.execute('''CREATE TABLE IF NOT EXISTS userdata
                 (id INTEGER PRIMARY KEY AUTOINCREMENT,
                 name TEXT,
                 age INTEGER,
                 email TEXT)''')

    # 获取输入框的值
    name = name_entry.get()
    age = age_entry.get()
    email = email_entry.get()

    # 将数据插入到表格中
    c.execute("INSERT INTO userdata (name, age, email) VALUES (?, ?, ?)", (name, age, email))

    # 提交更改并关闭数据库连接
    conn.commit()
    conn.close()

    # 清空输入框
    name_entry.delete(0, tk.END)
    age_entry.delete(0, tk.END)
    email_entry.delete(0, tk.END)

# 创建主窗口
root = tk.Tk()

# 创建输入框和标签
name_label = tk.Label(root, text="姓名：")
name_label.pack()
name_entry = tk.Entry(root)
name_entry.pack()

age_label = tk.Label(root, text="年龄：")
age_label.pack()
age_entry = tk.Entry(root)
age_entry.pack()

email_label = tk.Label(root, text="邮箱：")
email_label.pack()
email_entry = tk.Entry(root)
email_entry.pack()

# 创建保存按钮
save_button = tk.Button(root, text="保存", command=save_data)
save_button.pack()

# 运行主循环
root.mainloop()