【发布时间】：2019-05-28 05:18:51
【问题描述】：
我正在尝试使用 Kivy 在 Python 3 中使用 sqlite3 创建数据库。我在 youtube 上搜索过，堆栈溢出，甚至从 O'Reilly 那里买了一本 Kivy 书来解决这个问题。我还尝试过使用 tkinter、MySQL 和 JSON 来尝试使该功能正常工作......没有骰子。任何建议都会很棒。提前谢谢你
它应该做什么 用于更新和检索学生数据的简单输入框
会发生什么 当我输入数据并尝试更新数据库时，我得到：
AttributeError: 'CreateProfile' object has no attribute 'update_database'
代码
import sqlite3
from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.properties import ObjectProperty
from kivy.uix.checkbox import CheckBox
from kivy.uix.togglebutton import ToggleButton
from kivy.uix.button import Button
from kivy.uix.screenmanager import ScreenManager, Screen, FadeTransition
from kivy.lang import Builder
from kivy.uix.widget import Widget
from kivy.uix.dropdown import DropDown
from kivy.uix.behaviors.button import ButtonBehavior
from kivy.uix.boxlayout import BoxLayout
conn = sqlite3.connect('student.db')
c = conn.cursor()
class Database():
def __init__(self):
super(Database, self).__init__()
def create_table(self):
c.execute(
"CREATE TABLE IF NOT EXISTS studentdata (firstname TEXT, middleinitial TEXT, lastname TEXT, studentid REAL)")
conn.commit()
def read_from_db(self):
c.execute('SELECT * FROM studentdata')
data = c.fetchall()
def update_database(self):
with conn:
c.execute("INSERT INTO studentdata(firstname, middleinitial, lastname, studentid)\
VALUES(?, ?, ?, ?)",
(str(self.firstname.get()),
str(self.lastname.get()),
str(self.middleinitial.get()),
str(self.studentid.get()),
)
)
c.execute('UPDATE studentdata')
conn.commit()
class MainScreen(Screen):
pass
class CreateProfile(Screen):
pass
class ScreenManagement(ScreenManager):
pass
presentation = Builder.load_file("formfiller.kv")
class FormFiller(App):
title = "FormFiller"
def build(self):
return presentation
if __name__ == '__main__':
Database()
FormFiller().run()
c.close()
conn.close()
KV 文件
#: import FadeTransition kivy.uix.screenmanager.FadeTransition
ScreenManagement:
transition:FadeTransition()
MainScreen:
CreateProfile:
<Button@Button>:
font_size: 20
<MainTitle@Label>:
font_size: 50
size_hint_y: 1.9
size_hint_x: 1
bold: True
<SubTitle@Label>:
font_size: 25
size_hint_y: 1.70
size_hint_x: 1
bold: True
<InputField@Label>:
font_size: 18
bold: True
<TextInput@TextInput>:
font_size: 16
bold: True
height: self.line_height
<update_database>:
<MainScreen>:
name: "main"
MainTitle:
id: main_title
text: "Packet Filler"
SubTitle:
text: "Making Your Life Easier With the Push of a Button!"
Button:
on_release: app.root.current = "create_profile"
text: "Create New Profile"
pos_hint: {'x':.15, 'y':.45}
size_hint: (.25, .1)
Button:
text: "Load Profile"
pos_hint: {'x':.65, 'y':.45}
size_hint: (.25, .1)
<CreateProfile>:
name: "create_profile"
MainTitle:
id: main_title
text: "Create New Profile"
SubTitle:
text: "Input Your Data"
Button:
text: "Create"
pos_hint: {'x':.15, 'y':.02}
size_hint: (.25, .1)
on_release: root.update_database()
InputField:
text: "First Name:"
size_hint_y: 1.35
size_hint_x: .15
TextInput:
size_hint_y: .05
size_hint_x: .15
multiline: False
pos_hint: {'x':.15, 'y':.65}
InputField:
text: "Middle Initial:"
size_hint_y: 1.2
size_hint_x: .15
TextInput:
size_hint_y: .05
size_hint_x: .15
multiline: False
pos_hint: {'x':.15, 'y':.57}
InputField:
text: "Last Name:"
size_hint_y: 1.05
size_hint_x: .15
TextInput:
size_hint_y: .05
size_hint_x: .15
multiline: False
pos_hint: {'x':.15, 'y':.50}
追溯
Traceback (most recent call last):
File "/home/jarren/PycharmProjects/BCO_Form_Filler/formfiller.py", line 70, in <module>
FormFiller().run()
File "/usr/lib/python3/dist-packages/kivy/app.py", line 826, in run
runTouchApp()
File "/usr/lib/python3/dist-packages/kivy/base.py", line 502, in runTouchApp
EventLoop.window.mainloop()
File "/usr/lib/python3/dist-packages/kivy/core/window/window_sdl2.py", line 727, in mainloop
self._mainloop()
File "/usr/lib/python3/dist-packages/kivy/core/window/window_sdl2.py", line 460, in _mainloop
EventLoop.idle()
File "/usr/lib/python3/dist-packages/kivy/base.py", line 340, in idle
self.dispatch_input()
File "/usr/lib/python3/dist-packages/kivy/base.py", line 325, in dispatch_input
post_dispatch_input(*pop(0))
File "/usr/lib/python3/dist-packages/kivy/base.py", line 291, in post_dispatch_input
wid.dispatch('on_touch_up', me)
File "kivy/_event.pyx", line 707, in kivy._event.EventDispatcher.dispatch
File "/usr/lib/python3/dist-packages/kivy/uix/behaviors/button.py", line 179, in on_touch_up
self.dispatch('on_release')
File "kivy/_event.pyx", line 703, in kivy._event.EventDispatcher.dispatch
File "kivy/_event.pyx", line 1214, in kivy._event.EventObservers.dispatch
File "kivy/_event.pyx", line 1098, in kivy._event.EventObservers._dispatch
File "/usr/lib/python3/dist-packages/kivy/lang/builder.py", line 64, in custom_callback
exec(__kvlang__.co_value, idmap)
File "/home/jarren/PycharmProjects/BCO_Form_Filler/formfiller.kv", line 68, in <module>
on_release: root.update_database()
File "kivy/weakproxy.pyx", line 30, in kivy.weakproxy.WeakProxy.__getattr__
AttributeError: 'CreateProfile' object has no attribute 'update_database'
【问题讨论】：
标签： python python-3.x sqlite kivy