QSortFilterProxyModel nothing changes

[unix7777]

Hi i'm trying to filter the content displayed in the TableView getting the string from lineEdit but nothing happens when i write in the lineEdit.
HELP

QString searchValue = ui->lineEdit_search_clients->text();
 
        QSqlQueryModel *model=new QSqlQueryModel();
 
        QSortFilterProxyModel *proxyModel = new QSortFilterProxyModel;
        proxyModel->setSourceModel(model);
        proxyModel->setFilterRegExp(QRegExp(searchValue, Qt::CaseInsensitive, QRegExp::FixedString));
 
        model->setQuery("SELECT ROWID, ClientName, ClientCity, ClientEik FROM clients");
        model->setHeaderData(0, Qt::Horizontal, QObject::tr("RowID"));
        model->setHeaderData(1, Qt::Horizontal, QObject::tr("Name"));
        model->setHeaderData(2, Qt::Horizontal, QObject::tr("City"));
        model->setHeaderData(3, Qt::Horizontal, QObject::tr("ID"));
 
 
        ui->tableView_clients->setModel(proxyModel);
        ui->tableView_clients->setSortingEnabled(true);
        ui->tableView_clients->setColumnWidth(0,30);
        ui->tableView_clients->setColumnWidth(1,170);
        ui->tableView_clients->setColumnWidth(2,100);
        ui->tableView_clients->setColumnWidth(3,70);
        ui->tableView_clients->horizontalHeader()->setResizeMode(QHeaderView::Interactive);
        ui->tableView_clients->horizontalHeader()->setStretchLastSection(true);
        ui->tableView_clients->show();

QString searchValue = ui->lineEdit_search_clients->text();

        QSqlQueryModel *model=new QSqlQueryModel();

        QSortFilterProxyModel *proxyModel = new QSortFilterProxyModel;
        proxyModel->setSourceModel(model);
        proxyModel->setFilterRegExp(QRegExp(searchValue, Qt::CaseInsensitive, QRegExp::FixedString));

        model->setQuery("SELECT ROWID, ClientName, ClientCity, ClientEik FROM clients");
        model->setHeaderData(0, Qt::Horizontal, QObject::tr("RowID"));
        model->setHeaderData(1, Qt::Horizontal, QObject::tr("Name"));
        model->setHeaderData(2, Qt::Horizontal, QObject::tr("City"));
        model->setHeaderData(3, Qt::Horizontal, QObject::tr("ID"));


        ui->tableView_clients->setModel(proxyModel);
        ui->tableView_clients->setSortingEnabled(true);
        ui->tableView_clients->setColumnWidth(0,30);
        ui->tableView_clients->setColumnWidth(1,170);
        ui->tableView_clients->setColumnWidth(2,100);
        ui->tableView_clients->setColumnWidth(3,70);
        ui->tableView_clients->horizontalHeader()->setResizeMode(QHeaderView::Interactive);
        ui->tableView_clients->horizontalHeader()->setStretchLastSection(true);
        ui->tableView_clients->show();

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