这是我的应用程序，我用搜索按钮编辑信息很容易，我用python代码添加，删除，更新信息到本地数据库…它运行良好，添加信息，但当我使用更新所有信息或行在数据库中变得相同。另外，当删除所有数据时，可能是由于使用一个搜索栏将添加的数据带到要编辑或删除的位置
这是我的密码：

import sys
import os
import time

from PyQt5 import QtCore, QtGui, QtWidgets, uic
import mysql.connector
from mysql.connector import errorcode

FORM_CLASS, _ = uic.loadUiType(os.path.join(os.path.dirname(__file__),"mahmoudtarek.ui"))

class Main(QtWidgets.QMainWindow, FORM_CLASS):
    def __init__(self,parent=None):
        super(Main,self).__init__(parent)
        self.setupUi(self)
        self.InitUI()
        self.conn = None

        self.handle_buttons()
        self.handle_db_connections()

    def InitUI(self):
        ## changes in the run time
        pass

    def handle_buttons(self):
          ## all buttons in the app
        self.pushButton.clicked.connect(self.add_mahmoud_friends)
        self.pushButton_3.clicked.connect(self.update_mahmoud_friends)
        self.pushButton_2.clicked.connect(self.delete_mahmoud_friends)
        self.pushButton_6.clicked.connect(self.search_mahmoud_friends)

    def handle_db_connections(self):
        try:
            self.conn = mysql.connector.connect(
                host='127.0.0.1',
                database='mydb',
                user='root',
                password='134668691011',
                use_pure=True)  # use_pure is set to true

            if self.conn.is_connected():
                db_Info = self.conn.get_server_info()
                print("Connected to MySQL database using C extension... MySQL Server version on ", db_Info)
        except mysql.connector.Error as err:
            print("Error while connecting to MySQL using C extension", err)

    def add_mahmoud_friends(self):
        mth_friends = self.lineEdit.text()
        mth_search = self.lineEdit_4.text()
        if self.conn:
            c = self.conn.cursor()
            try:
                c.execute('''INSERT INTO ahmed (mth_friends,mth_search) values (%s,%s)''', (mth_friends,mth_search))
                self.conn.commit()
                self.lineEdit.setText('')
                self.lineEdit_4.setText('')
                self.statusBar.showMessage('ok mahmoud')

            except mysql.connector.Error as err:
                print("Error: ", err)

    def update_mahmoud_friends(self):
        mth_friends = self.lineEdit.text()
        mth_search = self.lineEdit_4.text()
        if self.conn:
            c = self.conn.cursor()
            try:
                c.execute('''UPDATE ahmed SET mth_friends = %s,mth_search = %s''', (mth_friends, mth_search))
                self.conn.commit()
                self.lineEdit.setText('')
                self.lineEdit_4.setText('')
                self.statusBar.showMessage('ok mahmoud')
                self.lineEdit_3.setText('')

            except mysql.connector.Error as err:
                print("Error: ", err)

    def delete_mahmoud_friends(self):
        c = self.conn.cursor()
        sql = '''DELETE FROM ahmed WHERE mth_search = %s'''
        mth_search = self.lineEdit_3.text()
        c.execute(sql, [(mth_search)])
        self.conn.commit()
        self.statusBar.showMessage("ok")
        self.lineEdit.setText('')
        self.lineEdit_4.setText('')
        self.lineEdit_3.setText('')

    def search_mahmoud_friends(self):
        if self.conn:
            c = self.conn.cursor()

            try:

                sql = '''SELECT * FROM ahmed WHERE mth_search = %s'''
                mth_search = self.lineEdit_3.text()
                c.execute(sql, [(mth_search)])
                data = c.fetchall()
                for row in data :
                    print(row)
                    self.lineEdit.setText(str(row[1]))
                    self.lineEdit_4.setText(str(row[2]))

            except mysql.connector.Error as err:
              print("Error: ", err)

    def closeEvent(self, event):
        if self.conn:
            self.conn.close()
        super(Main, self).closeEvent(event)

def main():
    app= QtWidgets.QApplication(sys.argv)
    window =Main()
    window.show()
    app.exec_()

if __name__ == '__main__':
    main()

我需要帮助，因为我还是一个初学者，如果有人知道这个问题，请给我写更正的代码。因为我找了太多…最后谢谢你