我使用sqlite3和tkinter制作了这个小型库存管理系统，问题是数据库的条目总是空的

Question

代码不添加新元素，而是向数据库添加空白值。糊涂了

def ProEntry():
        def makeEntry(name,date,dept,amt,amt2,lab,thr):
            conn = sqlite3.connect("database.db")
            cur = conn.cursor()
            cur.execute("INSERT INTO products VALUES(?,?,?,?,?,?,?)",(name.get(), date.get(), dept.get(), amt.get(), amt2.get(), lab.get(), thr.get()))
            conn.commit()
            conn.close()

从这里开始，我开始使用entry小部件向gui添加值

    entrywindow = Tk()
    entrywindow.title("New Product Entry")
    namedisp = Label(entrywindow, text="Name Of Product").grid(row=0, column=0)
    name = StringVar()
    nameentry = Entry(entrywindow, textvariable=name).grid(row=0, column=1)

为了检查单个变量，我使用name.get（）打印了name，但它也输出空值

    print(name.get())

    datedisp = Label(entrywindow, text="Date of Purchase (YYYY-MM-DD)").grid(row=1, column=0)
    date = StringVar()
    dateentry = Entry(entrywindow, textvariable=date).grid(row=1, column=1)

    deptdisp = Label(entrywindow, text="Name Of Department(s) seperate with ','").grid(row=2, column=0)
    dept = StringVar()
    deptentry = Entry(entrywindow, textvariable=dept).grid(row=2, column=1)

    amtdisp = Label(entrywindow, text="Amount Purchased").grid(row=3, column=0)
    amt = StringVar()
    amtentry = Entry(entrywindow, textvariable=amt).grid(row=3, column=1)

    amt2disp = Label(entrywindow, text="Amount Installed").grid(row=4, column=0)
    amt2 = StringVar()
    amt2entry = Entry(entrywindow, textvariable=amt2).grid(row=4, column=1)

    labdisp = Label(entrywindow, text="Room number Of Lab(s) seperate with ','").grid(row=5, column=0)
    lab = StringVar()
    labentry = Entry(entrywindow, textvariable=lab).grid(row=5, column=1)

    thrdisp = Label(entrywindow, text="Threshold").grid(row=6, column=0)
    thr = StringVar()
    threntry = Entry(entrywindow, textvariable=thr).grid(row=6, column=1)

    confirm = Button(entrywindow, text="Confirm", command = makeEntry(name,date,dept,amt,amt2,lab,thr)).grid(row=7, column=0)
    exi = Button(entrywindow, text="Exit", command = entrywindow.destroy).grid(row=7, column=1)

    entryWindow.mainloop()

Answer 1

我想我遇到了这个问题，当您键入这行代码时，例如：

labentry = Entry(entrywindow, textvariable=lab).grid(row=5, column=1)

labentry值将返回为None，因此请尝试：

labentry = Entry(entrywindow, textvariable=lab);labentry.grid(row=5, column=1)

希望我能帮助你