如何从数据库中获取数据并在kivy+python的表中显示

Posted 2023-02-15

【中文标题】如何从数据库中获取数据并在kivy+python的表中显示

【英文标题】：How to fetch data from database and show in table in kivy+python

【发布时间】：2018-04-11 07:56:36

【问题描述】：

list.py

​​>

import kivy

kivy.require('1.9.0')  # replace with your current kivy version !
import sqlite3 as lite
from kivy.uix.screenmanager import Screen
from kivy.app import App
from kivy.lang import Builder
from kivy.uix.boxlayout import BoxLayout
from kivy.core.window import Window

Window.clearcolor = (0, 0.517, 0.705, 1)

Window.size = (500, 330)
from easygui import msgbox


con = lite.connect('demo.db')
con.text_factory = str
cur = con.cursor()

class TestScreen(Screen):
    pass

    def get_user(self):

        cur.execute("SELECT * FROM `user` order by id asc")
        self.rows = cur.fetchall()

        print(self.rows)

class List(App):
    def build(self):
        self.root = Builder.load_file('list.kv')
        return TestScreen().get_user()



if __name__ == '__main__':
    List().run()

以上代码获取结果，但我不知道如何列出类似表格

如何从数据库中检索数据并在表格中列出

身份证名称 1个ABC 2 定义

当点击行时，它会显示在新窗口中，包含带有编辑值的文本类型。

提前致谢

【问题讨论】：

查看 RecycleView 小部件的文档

【参考方案1】：

解决方案是将RecycleView 与 SelectableButton、SelectableRecycleGridLayout、Popup 和 TextInput 一起使用。详情请参考以下示例。

示例

main.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


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):
        connection = sqlite3.connect("demo.db")
        cursor = connection.cursor()

        cursor.execute("SELECT * FROM Users ORDER BY UserID ASC")
        rows = cursor.fetchall()

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


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: 2

            Label:
                text: "User ID"
            Label:
                text: "User Name"

        BoxLayout:
            RecycleView:
                viewclass: 'SelectableButton'
                data: ['text': str(x) for x in root.data_items]
                SelectableRecycleGridLayout:
                    cols: 2
                    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

输出

【讨论】：

欲了解更多信息，请访问RecycleView widget