使用 SQLITE/PYTHON 插入用户和密码

Question

在一个有用户和密码的小组程序上工作。我们正在尝试通过 python 将我们的用户和密码插入到 sqlite。但是 atm 我们只是在我们的图形窗口弹出一个应该发送数据的按钮之前发送空白数据。我们尝试了在多个网站上发现的不同变体，但似乎没有任何效果。

from tkinter import *
import sqlite3
import sys




conn = sqlite3.connect('indexCards.db')
cur = conn.cursor()
users ={}

def addUser(entUsername, entPassword):

    #global entUsername, entPassword
    NAME = entUsername.get()
    PASSWORD = entPassword.get()
    print("add User") #this is testing only
    print(NAME, PASSWORD) # this is testing to see the passed variable
    //
   //This is where we are having the issues
    conn.executemany('INSERT INTO USER(NAME,PASSWORD)\
          VALUES (? ,?);', [(NAME,PASSWORD)])
    conn.commit();

    return (NAME, PASSWORD)


def makeWindow():
    global entUsername, entPassword
    window = Tk()
    window.title('Add New User')

    lblInst = Label(window, text = "Create your account here:", font=("Helvetica",16))
    lblInst.pack()
    lblUsername = Label(window, text="Please enter a username: ")
    entUsername = Entry(window)
    lblUsername.pack()
    entUsername.pack()


    lblPassword = Label(window, text="Please enter a password: ")
    entPassword = Entry(window)

    lblPassword.pack()
    entPassword.pack()


    btn = Button(window, text="Create", command=addUser(entUsername, entPassword))

    btn.pack()
    print (addUser(entUsername, entPassword))
    print('entUsername', 'entPassword')

    #window.mainloop()

    return window



#if __name__ == '__main__':
 #   main():

window = makeWindow()
window.mainloop()

Answer 1

问题是您在用户有机会输入任何数据之前立即调用该函数。

见Why is Button parameter “command” executed when declared?

Answer 2

它立即调用该方法并且按下按钮没有执行任何操作的原因是 addUser(entUsername, entPassword) 被评估并且其返回值被归因于按钮的命令。因此，如果 addUser 打印出一些信息来告诉您它已运行并返回 None，您只需运行 addUser 来评估其返回值并给出 None 作为按钮的命令。
要使用按钮来调用具有不同参数的函数，您可以使用全局变量，尽管我不推荐它：

import sqlite3
from tkinter import *

conn = sqlite3.connect('indexCards.db')
cur = conn.cursor()
users = {}
cur = conn.cursor()
cur.execute('''
Create table if not exists USER(NAME varchar(100), PASSWORD varchar(100))
''')


def addUser():
    NAME = entUsername.get()
    PASSWORD = entPassword.get()
    print("add User")  # this is testing only
    print(NAME, PASSWORD)  # this is testing to see the passed variable
    # This is where we are having the issues
    conn.executemany('INSERT INTO USER(NAME,PASSWORD) VALUES (? ,?);', [(NAME, PASSWORD)])
    conn.commit()

    return (NAME, PASSWORD)


def makeWindow():
    global entUsername
    global entPassword
    window = Tk()
    window.title('Add New User')

    lblInst = Label(window, text="Create your account here:", font=("Helvetica", 16))
    lblInst.pack()
    lblUsername = Label(window, text="Please enter a username: ")
    entUsername = Entry(window)
    lblUsername.pack()
    entUsername.pack()

    lblPassword = Label(window, text="Please enter a password: ")
    entPassword = Entry(window)

    lblPassword.pack()
    entPassword.pack()

    btn = Button(window, text="Create", command=addUser)

    btn.pack()
    print(addUser())

    window.mainloop()

    return window

window = makeWindow()

如果您不想创建全局，则可以将带有多个参数的函数传递给匿名函数，即 lambda 函数

btn = Button(window, text="Create", command= lambda : addUser(entUsername, entPassword))