如何使用 kivy 和 RecycleView 编辑 SQLite 数据库值

Question

我正在尝试使用 kivy 在 python 中显示 sqlite3 数据库。测试了 ikolim 的解决方案 here，它可以按预期将数据库内容显示到 RecycleView 的按钮标签中：

当按下按钮时，会按预期显示弹出和编辑功能：

它确实会编辑所选按钮的文本，如下面的屏幕截图所示..：

..但不是 sqlite 数据库值。 是否可以将用户在 Kivy 应用程序中所做的更改反映到 sqlite 数据库中的值？

代码如下：

test.py

​​>

import sqlite3

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.recycleview.views import RecycleDataViewBehavior
from kivy.uix.button import Button
from kivy.properties import BooleanProperty, ListProperty, StringProperty, ObjectProperty
from kivy.uix.recyclegridlayout import RecycleGridLayout
from kivy.uix.behaviors import FocusBehavior
from kivy.uix.recycleview.layout import LayoutSelectionBehavior
from kivy.uix.popup import Popup

connection = sqlite3.connect("demo.db", isolation_level=None)
cursor = connection.cursor()

class TextInputPopup(Popup):
    obj = ObjectProperty(None)
    obj_text = StringProperty("")

    def __init__(self, obj, **kwargs):
        super(TextInputPopup, self).__init__(**kwargs)
        self.obj = obj
        self.obj_text = obj.text


class SelectableRecycleGridLayout(FocusBehavior, LayoutSelectionBehavior,
                                  RecycleGridLayout):
    ''' Adds selection and focus behaviour to the view. '''


class SelectableButton(RecycleDataViewBehavior, Button):
    ''' Add selection support to the Button '''
    index = None
    selected = BooleanProperty(False)
    selectable = BooleanProperty(True)

    def refresh_view_attrs(self, rv, index, data):
        ''' Catch and handle the view changes '''
        self.index = index
        return super(SelectableButton, self).refresh_view_attrs(rv, index, data)

    def on_touch_down(self, touch):
        ''' Add selection on touch down '''
        if super(SelectableButton, self).on_touch_down(touch):
            return True
        if self.collide_point(*touch.pos) and self.selectable:
            return self.parent.select_with_touch(self.index, touch)

    def apply_selection(self, rv, index, is_selected):
        ''' Respond to the selection of items in the view. '''
        self.selected = is_selected

    def on_press(self):
        popup = TextInputPopup(self)
        popup.open()

    def update_changes(self, txt):
        self.text = txt


class RV(BoxLayout):
    data_items = ListProperty([])

    def __init__(self, **kwargs):
        super(RV, self).__init__(**kwargs)
        self.get_users()

    def get_users(self):

        cursor.execute("CREATE TABLE IF NOT EXISTS Callbacks(cName TEXT, cID INT, cbTime INT, cbRems TEXT)")
        cursor.execute("INSERT INTO Callbacks VALUES ('Client1','1','1500','Test1')")
        cursor.execute("INSERT INTO Callbacks VALUES ('Client2','2','1600','Test2')")
        cursor.execute("INSERT INTO Callbacks VALUES ('Client3','3','1700','Test3')")
        connection.commit()
        cursor.execute("SELECT * FROM Callbacks ORDER BY ROWID DESC")

        rows = cursor.fetchall()

        # create data_items
        for row in rows:
            for col in row:
                self.data_items.append(col)

        for row in rows:
            print(self.data_items)



class TestApp(App):
    title = "Kivy RecycleView & SQLite3 Demo"

    def build(self):
        return RV()


if __name__ == "__main__":
    TestApp().run()

test.kv

#:kivy 1.10.0

<TextInputPopup>:
    title: "Popup"
    size_hint: None, None
    size: 400, 400
    auto_dismiss: False

    BoxLayout:
        orientation: "vertical"
        TextInput:
            id: txtinput
            text: root.obj_text
        Button:
            size_hint: 1, 0.2
            text: "Save Changes"
            on_release:
                root.obj.update_changes(txtinput.text)
                root.dismiss()
        Button:
            size_hint: 1, 0.2
            text: "Cancel Changes"
            on_release: root.dismiss()


<SelectableButton>:
    # Draw a background to indicate selection
    canvas.before:
        Color:
            rgba: (.0, 0.9, .1, .3) if self.selected else (0, 0, 0, 1)
        Rectangle:
            pos: self.pos
            size: self.size

<RV>:
    BoxLayout:
        orientation: "vertical"

        GridLayout:
            size_hint: 1, None
            size_hint_y: None
            height: 25
            cols: 4

            Label:
                text: "Name"
            Label:
                text: "ID"
            Label:
                text: "CB Time"
            Label:
                text: "Remarks"

        BoxLayout:
            RecycleView:
                viewclass: 'SelectableButton'
                data: [{'text': str(x)} for x in root.data_items]
                SelectableRecycleGridLayout:
                    cols: 4
                    default_size: None, dp(26)
                    default_size_hint: 1, None
                    size_hint_y: None
                    height: self.minimum_height
                    orientation: 'vertical'
                    multiselect: True
                    touch_multiselect: True

Answer 1

为了反映对sql 的更改，您需要使用update 命令更新sql 表。