我使用 pyqt gui 應(yīng)用程序使用以下函數(shù)從我的數(shù)據(jù)庫中提取歷史記錄def historique_jr_date(self):        database = QSqlDatabase("QPSQL")        database.setHostName("localhost")        database.setDatabaseName("database")        database.setUserName("postgres")        database.setPassword("password")        database.open()                model_hjd = QSqlTableModel(db=database)        model_hjd.setTable('transactions')                model_hjd.setEditStrategy(QSqlTableModel.OnManualSubmit)                date = str(self.dateEdit_2.text())        selected_day = self.dateEdit_2.date()        last_day = selected_day.addDays(-1)        last_day_str = last_day.toString(self.dateEdit_2.displayFormat())        print(last_day_str)                self.tableView_3.setModel(model_hjd)        self.tableView_3.horizontalHeader().setSectionResizeMode(QHeaderView.Stretch)        #idx = model_ft.fieldIndex("max(id)")        model_hjd.setSort(7, Qt.DescendingOrder)        model_hjd.select()        filter_ft = "(date_d, time_d) > ('%s'::date, '16:00:00'::time) AND (date_d, time_d) < ('%s'::date, '16:00:00'::time) " % (selected_day, last_day)        model_hjd.setFilter(filter_ft)        self.connection = psycopg2.connect(user="postgres",                               password="password",                               host="localhost",                               database="database")        self.cur = self.connection.cursor()        self.cur.execute( '''SELECT SUM(montant) AS total FROM transactions WHERE (date_d, time_d) > ('%s'::date, '16:00:00'::time) AND (date_d, time_d) < ('%s'::date, '16:00:00'::time)''',(selected_day, last_day))        result = self.cur.fetchall()        for i in result:            o = i[0]            oo = str(o)        self.lineEdit_19.setText(oo)