psycopg2.ProgrammingError：无法适应类型“QDate”pyqt sql

Question

我使用 pyqt gui 应用程序使用以下函数从我的数据库中提取历史记录

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)

Answer 1

selected_day和的类型last_day是。QDate将它们转换为字符串，例如：(selected_day.toString(Qt.ISODate), last_day.toString(Qt.ISODate))