在 Python 中将 OptionMenu() 下拉菜单中的数据插入 SQLite 数据库答案

【问题标题】：Inserting data from an OptionMenu() drop-down menu into an SQLite database in Python在 Python 中将 OptionMenu() 下拉菜单中的数据插入 SQLite 数据库
【发布时间】：2019-11-27 15:07:47
【问题描述】：

我正在 python 中使用 下拉菜单（来自 tkinter 的 OptionMenu）制作一个 GUI。

我想将下拉菜单中的数据插入 SQLite 数据库，例如，有一个用于选择汽车的下拉菜单，我想将用户的汽车选择插入数据库连同条目的日期。

我一直在检查 how to use tkinter with sqlite in python 和 Use OptionMenu in Python，但我的代码无法正常工作（请参阅错误消息）。

我使用的是 Python 3.7.4，Windows 10。

谢谢！

from tkinter import * 
import sqlite3 as sq
import datetime

# Main window
window = Tk()

# Connection to SQLite 
con = sq.connect('Cars.db') 

# Car choice variable and placeholder 
carV = StringVar(window)
carV.set('Choose your car') 

# Car choice dictionary for drop-down menu
carD = {'BMW', 'Volvo', 'Mitsubishi'}

# Car chhoice drop-down menu 
carDDM = OptionMenu(window, carV, carD)
carDDM.place(x=150,y=150)

# Function for inserting car choice from drop-down menu into SQLite 
def SaveCarChoice():

        c.execute('CREATE TABLE IF NOT EXISTS (sql_date TEXT, sql_carV INTEGER)') 
        date = datetime.date(int(year.get()),int(month.get()), int(day.get())) 
        c.execute('INSERT INTO (sql_date, sql_carV) VALUES (?, ?)', (date, carDDM.get()) 
        con.commit()

# Button for user to activate the function inserting data into SQLite                    
carB = Button(window, text="Enter",command=SaveCarChoice()) 
carB.pack() 

window.mainloop()

# ERROR MESSAGE
  File "<ipython-input-5-7b7f66e12fbf>", line 42
    con.commit()
      ^
SyntaxError: invalid syntax

【问题讨论】：

您在前一行缺少一个结束 )，即 `c.execute(.... And this carDDM.get()` 应该读取 carV.get() variable= from OptionMenu

标签： python sqlite tkinter optionmenu

【解决方案1】：

你这个我做了一些改变。

import tkinter as tk
import sqlite3 as sq
import datetime


# Connection to SQLite
con = sq.connect('Cars.db')

# Car choice dictionary for drop-down menu
carD = ['BMW', 'Volvo', 'Mitsubishi']


root = tk.Tk()
canvas = tk.Canvas(root, height=500, width= 500, bg="white")
canvas.pack()

carV = tk.StringVar(root)
carV.set('Choose your car')

carDDM = tk.OptionMenu(canvas, carV, *carD)
carDDM.pack()

# Function for inserting car choice from drop-down menu into SQLite
def SaveCarChoice():
    c = con.cursor()
    c.execute('CREATE TABLE IF NOT EXISTS CAR (sql_date VARCHAR(20), sql_carV VARCHAR(20) NOT NULL)')
    today = str(datetime.date.today())
    today = today[8:] + '-' + today[5:7] + '-' + today[:4]
    c.execute('INSERT INTO CAR (sql_date, sql_carV) VALUES (?, ?)', (today, carV.get()))
    con.commit()

# Button for user to activate the function inserting data into SQLite
carB = tk.Button(canvas, text="Enter", command=SaveCarChoice)
carB.pack()

root.mainloop()

【讨论】：