Python 如何使用QDataWidgetMapper从QListWidget编辑字符串作为项目

我正在使用QListWidget、QSqlTableModel、QtableView和QDataWidgetMapper。QListWidget是ItemIsUserCheckable。 我能够将QListWidget中的选定项以字符串格式保存到单个字段中的QtSql表中（将列表项转换为字符串“绿色、绿色葡萄、橙色”）。 但同时我想更改所选项目并从QListWidget更新项目的字符串数据。如何做。是否可能。或者，如果有其他解决方案，请告诉我。 下面是示例代码：

from PyQt5 import QtCore, QtGui, QtWidgets, QtSql
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtSql import *


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(391, 496)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.listWidget = QtWidgets.QListWidget(self.centralwidget)
        self.listWidget.setGeometry(QtCore.QRect(9, 9, 373, 188))
        self.listWidget.setObjectName("listWidget")
        self.save_btn = QtWidgets.QPushButton(self.centralwidget)
        self.save_btn.setGeometry(QtCore.QRect(100, 230, 75, 23))
        self.save_btn.setObjectName("save_btn")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(9, 203, 27, 16))
        self.label.setObjectName("label")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(56, 203, 181, 20))
        self.lineEdit.setObjectName("lineEdit")
        self.update_btn = QtWidgets.QPushButton(self.centralwidget)
        self.update_btn.setGeometry(QtCore.QRect(293, 229, 75, 23))
        self.update_btn.setObjectName("update_btn")
        self.edit_btn = QtWidgets.QPushButton(self.centralwidget)
        self.edit_btn.setGeometry(QtCore.QRect(199, 229, 75, 23))
        self.edit_btn.setObjectName("edit_btn")
        self.tableView = QtWidgets.QTableView(self.centralwidget)
        self.tableView.setGeometry(QtCore.QRect(9, 258, 373, 188))
        self.tableView.setObjectName("tableView")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 391, 21))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

        db = QtSql.QSqlDatabase.addDatabase("QSQLITE")
        db.setDatabaseName("fruites.db")
        if db.open():
            if db.open():
                query = QSqlQuery()
                query.exec_("""CREATE TABLE IF NOT EXISTS store(name TEXT, items TEXT)""")

        self.store_model = QtSql.QSqlTableModel()
        self.store_model.setTable("store")
        self.store_model.select()
        self.tableView.setModel(self.store_model)

        list_ = ["Green", "Green Apple","Green Grapes", "Bananas", "Oranges"]
        list_ = dict.fromkeys(list_, 0)
        for i in list_:
            item = QtWidgets.QListWidgetItem(i)
            item.setFlags(item.flags() | QtCore.Qt.ItemIsUserCheckable)
            item.setCheckState(QtCore.Qt.Unchecked)
            self.listWidget.addItem(item)

        self.save_btn.clicked.connect(self.save_item)
        self.edit_btn.clicked.connect(self.edit_item)
        self.update_btn.clicked.connect(self.submit_item)


    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.save_btn.setText(_translate("MainWindow", "Save"))
        self.label.setText(_translate("MainWindow", "Name"))
        self.update_btn.setText(_translate("MainWindow", "Update"))
        self.edit_btn.setText(_translate("MainWindow", "Edit"))

    def save_item(self):
        name = self.lineEdit.text()
        strng = ''
        checked = []
        for row in range(self.listWidget.count()):
            item = self.listWidget.item(row)
            if item.checkState():
                checked.append(item)
        strng = ", " .join(i.text() for i in checked)

        r = self.store_model.record()
        r.setValue("name", name)
        r.setValue("items", strng)
        self.store_model.insertRecord(-1, r)

        self.store_model.select()
        self.lineEdit.clear()
        for i in range(self.listWidget.count()):
            item = self.listWidget.item(i)
            item.setCheckState(QtCore.Qt.Unchecked)

    def edit_item(self):
        selected = self.tableView.selectedIndexes()
        if not self.store_model.rowCount():
            return
        index = self.tableView.currentIndex()
        if index.isValid():
            row = index.row()
        else:
            row = 0

        self.store_mapper = QtWidgets.QDataWidgetMapper()
        self.store_mapper.setSubmitPolicy(QtWidgets.QDataWidgetMapper.ManualSubmit)
        self.store_mapper.setModel(self.tableView.model())

        self.store_mapper.addMapping(self.lineEdit, 0)
        self.store_mapper.addMapping(self.listWidget, 1)

        self.store_mapper.setCurrentIndex(row)

    def submit_item(self):
        self.store_mapper.submit()
        self.lineEdit.clear()

        
if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

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为什么不将项目作为单个元素存储在SQL数据库中？这样不仅效率更高，而且可以让您轻松地执行所需操作。这并不意味着一旦您从数据库检索到数据，您就无法将其全部显示在一起，如果您想…@Isma。如何作为单个元素存储。您能给我举个例子吗。@伊斯玛，你能帮我吗。