Pyqt5 работа с sqlite3

import sys
from PyQt5 import QtWidgets, QtCore, QtGui
import test, test2
import sqlite3
 
class TwoWindow(QtWidgets.QMainWindow, test2.Ui_MyWindow):
    def __init__(self):
        super().__init__()
        self.setupUi(self)
        self.oneWindow = None
        self.pushButton.clicked.connect(self.check2)
        self.listView.clear()
        con = Qtsql.QSqlDatabase.addDatabase('QSQLITE')
        con.setDatabaseName('test.db')
        
        result = self.listView.additem(item)
    
    def check2(self):
        self.close()
        self.oneWindow = OneWindow()
        self.oneWindow.show()
 
    
class OneWindow(QtWidgets.QMainWindow, test.Ui_MainWindow):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setupUi(self)        
        self.twoWindow = None
        self.pushButton_2.clicked.connect(self.check)
        self.pushButton.clicked.connect(QtWidgets.qApp.quit)
 
    def check(self):
        self.close()
        self.twoWindow = TwoWindow()
        self.twoWindow.show()
        
def main():
    app = QtWidgets.QApplication(sys.argv)
    window = OneWindow()
    window.show()
    sys.exit(app.exec_())
        
        
if __name__ == "__main__":
    main()

from PyQt5 import QtCore, QtGui, QtWidgets
 
 
class Ui_MyWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(822, 774)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.gridLayout.setObjectName("gridLayout")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setObjectName("lineEdit")
        self.gridLayout.addWidget(self.lineEdit, 0, 1, 1, 1)
        self.listWidget = QtWidgets.QListWidget(self.centralwidget)
        self.listWidget.setObjectName("listWidget")
        self.gridLayout.addWidget(self.listWidget, 4, 0, 1, 2)
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setObjectName("pushButton_2")
        self.gridLayout.addWidget(self.pushButton_2, 2, 1, 1, 1)
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setObjectName("pushButton")
        self.gridLayout.addWidget(self.pushButton, 3, 1, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
 
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
 
    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton_2.setText(_translate("MainWindow", "Поиск"))
        self.pushButton.setText(_translate("MainWindow", "Назад"))