check_field 显示我登录正确，而无需连接到 mysql DB 为什么是 Pyqt5

如何解决check_field 显示我登录正确，而无需连接到 mysql DB 为什么是 Pyqt5

问题是，如果在用户名 lineEdit 或密码 lineEdit 中写入任何单词，他会显示我登录正确......我只想要数据库中的数据注册器..

我在 MysqL 中创建数据库：def page_login(self):

我为用户名和密码创建了检查字段：def checkfiels(self):

（如果留下用户名或密码或两个空字段或填写标签用户和密码，则无需连接数据库即可正常工作。完成！！

我现在想要如果来自数据库的填充标签用户或密码向我显示来自：def checkfiels(self):的msg错误

有一个代码：

    from cgitb import enable
    from peewee import *
    import self
    from PyQt5.QtCore import QPropertyAnimation
    from pyside2 import *
    from PyQt5 import *
    import Resources_rc
    from PyQt5 import QtCore,QtGui,QtWidgets,uic
    from PyQt5.QtWidgets import QPushButton,QLineEdit
    import sys
    import pyMysqL
    
    pyMysqL.install_as_MysqLdb()
    
    class MyWindow(QtWidgets.QMainWindow):
        def __init__(self,maxWidth=None):
            super(MyWindow,self).__init__()
            self.MysqL_db = MysqLDatabase('data',user='root',password='toor',host='127.0.0.1',port=3306)
            uic.loadUi('MainWindow.ui',self)
            self.handel_buttons()
            self.db_connection()
            self.add_users()
            
            self.frame_error.hide()  
            self.btn_close_popup_7.clicked.connect(lambda: self.frame_error.hide())
            self.btn_log_6.clicked.connect(self.checkfiels)
    
    ######################## CONNECT DATABASE ##################
        def db_connection(self):
            self.cur = self.MysqL_db.cursor()
            print('connected')
    
    
    
    ######################## FORM LOGIN  ##################
    
        def page_login(self):
            username = self.lineEdit_10.text()
            password = self.lineEdit_5.text()
    
            self.cur.execute(''' SELECT username,password FROM users''')
            data = self.cur.fetchall()
            found = True
            for row in data:
    
                if row[0] == username and row[1] == password:
                    self.frame_left_menu.show()
                    print(row)

    ######################## CHECK FIELS FORM LOGIN #######

    
        def checkfiels(self):
    
            textUser = " "
            textPassword = " "
    
            def showMessage(message):
                self.frame_error.show()
                self.label_164.setText(message)
    
            ## CHECK USER ##
            if not self.lineEdit_10.text():
                textUser = " User Empty "
            else:
                textUser = ""
    
            ## CHECK PASSWORD ##
            if not self.lineEdit_5.text():
                textPassword = " Password Empty "
            else:
                textPassword = ""

            if textUser + textPassword != '':
                text = textUser + textPassword
                showMessage(text)
            else:
                text = " Login OK. "   
                if self.checkBox_6.isChecked():
                    text = text + " | Saver User OK. "
                showMessage(text)
    
    
    
    if __name__ == '__main__':
        app = QtWidgets.QApplication(sys.argv)
        window = MyWindow()
        window.show()
        sys.exit(app.exec_())

谢谢