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Qt Demo, 删除记录之前需要提示用户,选择确定或取消,网上查到了方法:

https://doc.qt.io/qt-5/qmessagebox.html

QMessageBox msgBox;
msgBox.setText("提示");
msgBox.setInformativeText("确实要删除吗?");
msgBox.setStandardButtons(QMessageBox::Ok | QMessageBox::Cancel);
msgBox.setDefaultButton(QMessageBox::Ok);
int ret = msgBox.exec();
if(ret == QMessageBox::Ok){//...
}

或者:  

https://stackoverflow.com/questions/13111669/yes-no-message-box-using-qmessagebox

QMessageBox::StandardButton btn;
tn = QMessageBox::question(this, "提示", "确实要删除吗?", QMessageBox::Yes|QMessageBox::No);
if (btn == QMessageBox::Yes) {//...
}