Question

我正在使用此 Switch between two frames in tkinter 中的答案来创建我的 GUI。

对于第一帧 StartPage，我尝试使用名为 DbConfig().fetch_data() 的函数显示数据库中的数据。

第二帧 NewStudentPage 用于插入新数据。

我试图弄清楚如何在 DbConfig().fetch_data() 中调用 StartPage，如果该框架可见，或者在我单击 save (insert and redirects) 中的按钮 NewStudentPage 后，所以我可以与新插入的数据一起显示。

class SampleApp(Tk):
  def __init__(self, *args, **kwargs):
    Tk.__init__(self, *args, **kwargs)

    container = Frame(self)
    container.pack(side="top", fill="both", expand=True)
    container.grid_rowconfigure(0, weight=1)
    container.grid_columnconfigure(0, weight=1)

    self.frames = {}

    for f in (StartPage, NewStudentPage):
      page_name = f.__name__
      frame = f(parent=container, controller=self)
      self.frames[page_name] = frame

      frame.grid(row=0, column=0, sticky="nsew")

    self.show_frames("StartPage")

  def show_frames(self, page_name):
    frame = self.frames[page_name]
    frame.tkraise()

class StartPage(Frame):
  def __init__(self, parent, controller):
    Frame.__init__(self, parent)

    self.controller = controller
    Label(self, text="StandBy").pack(side="top", fill="x", pady=10)
    
    data = DbConfig().fetch_data()  <<<<<<--------------------- THIS FUNCTION
    print(data)

    Button(self, text="add student", command=lambda: controller.show_frames("NewStudentPage")).pack()


class NewStudentPage(Frame):
  def __init__(self, parent, controller):
    Frame.__init__(self, parent)
    self.controller = controller

    Label(self, text="New Student", font=Font(size="12", weight="bold")).place(relx=0.5, rely=0.1, anchor=CENTER)

    self.course = StringVar()
    Label(self, text="course").place(x=40, y=40)
    Entry(self, textvariable=self.course, width=25).place(x=80, y=40)
    
    self.firstname = StringVar()
    Label(self, text="firstname").place(x=15, y=65)
    Entry(self, textvariable=self.firstname, width=15).place(x=50, y=65)

    self.lastname = StringVar()
    Label(self, text="lastname").place(x=160, y=65)
    Entry(self, textvariable=self.lastname, width=15).place(x=190, y=65)

    Button(self, text="back", command=lambda: controller.show_frames("StartPage")).place(x=110, y=120)
    Button(self, text="save", command=lambda: [self.save_data(), controller.show_frames("StartPage")]).place(x=150, y=120)
  
  def save_data(self):
    course = self.course.get()
    firstname = self.firstname.get()
    lastname = self.lastname.get()
    DbConfig().insert_student(course, firstname, lastname)

class DbConfig:
  def __init__(self):
    self.conn = sqlite3.connect("database/config.db")
    self.cursor = self.conn.cursor()
    self.create_table()

  def create_table(self):
    self.cursor.execute("""CREATE TABLE IF NOT EXISTS tbl_student (
          _id integer PRIMARY KEY,
          course text,
          firstname text,
          lastname text
        )""")

  def insert_student(self, course, firstname, lastname):
    self.cursor.execute("""INSERT INTO tbl_student
      (course, firstname, lastname)
      VALUES (?, ?, ?) """, (course, firstname, lastname))
    self.conn.commit()

  def fetch_data(self):
    data = self.cursor.execute("SELECT * FROM tbl_student").fetchall()
    return data


if __name__ == "__main__":
  app = SampleApp()
  app.mainloop()

Answer 1

您在保存学生时尚未调用该函数。将以下代码添加到 save_data 类中的 NewStudentPage 函数。这将打印数据库表中的所有数据，即使是刚刚添加的数据。

data = DbConfig().fetch_data()
print(data)

Tkinter 在按钮点击后调用一个函数

1 个答案: