selectionChanged() signal in qtableview

[breakthecode]

I am trying to get an item from qtableview or specifically a column from the selected row when a raw selected.

this is my code

QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("memory");
    if (!db.open()) {
        QMessageBox::critical(0, qApp->tr("Cannot open database"),
            qApp->tr("Unable to establish a database connection.\n"
                     "This example needs SQLite support. Please read "
                     "the Qt SQL driver documentation for information how "
                     "to build it.\n\n"
                     "Click Cancel to exit."), QMessageBox::Cancel);
        //return false;
    }
 
     QSqlTableModel *model = new QSqlTableModel;
     model->setTable("person");
     model->select();
     model->setHeaderData(0, Qt::Horizontal, tr("ID"));
     model->setHeaderData(1, Qt::Horizontal, tr("Name"));
     model->setHeaderData(2, Qt::Horizontal, tr("House Name"));
     ui->tableView->setModel(model);
     ui->tableView->setSelectionBehavior(QAbstractItemView::SelectRows);
     ui->tableView->setSelectionMode(QAbstractItemView::SingleSelection);
     ui->tableView->setEditTriggers(QAbstractItemView::NoEditTriggers);
     ui->tableView->show();
     connect(ui->tableView->selectionModel(), SIGNAL(selectionChanged()), this, SLOT(on_tableViewSelection()));

QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("memory");
    if (!db.open()) {
        QMessageBox::critical(0, qApp->tr("Cannot open database"),
            qApp->tr("Unable to establish a database connection.\n"
                     "This example needs SQLite support. Please read "
                     "the Qt SQL driver documentation for information how "
                     "to build it.\n\n"
                     "Click Cancel to exit."), QMessageBox::Cancel);
        //return false;
    }

     QSqlTableModel *model = new QSqlTableModel;
     model->setTable("person");
     model->select();
     model->setHeaderData(0, Qt::Horizontal, tr("ID"));
     model->setHeaderData(1, Qt::Horizontal, tr("Name"));
     model->setHeaderData(2, Qt::Horizontal, tr("House Name"));
     ui->tableView->setModel(model);
     ui->tableView->setSelectionBehavior(QAbstractItemView::SelectRows);
     ui->tableView->setSelectionMode(QAbstractItemView::SingleSelection);
     ui->tableView->setEditTriggers(QAbstractItemView::NoEditTriggers);
     ui->tableView->show();
     connect(ui->tableView->selectionModel(), SIGNAL(selectionChanged()), this, SLOT(on_tableViewSelection()));

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error shown is
"QObject::connect: No such signal QItemSelectionModel::selectionChanged() in ../CDMS/cdms.cpp:43
QObject::connect: (receiver name: 'CDMS')"