错误 no matching function for call to 'QLineEdit::setText(QMode|Index&)'

void gz::on_pushButton_2_clicked()
{
     static QSqlQueryModel *model = new QSqlQueryModel(ui->tableView);
     model->setQuery(QString("select * from yggzinfo;"));
     int column = model->columnCount(); //获得列数
      int row = model->rowCount();    // 获得行数
      QModelIndex index = model->index(column,row,QModelIndex());
     ui->lineEdit->setText(index);
}

数据的格式不对，QLineEdit 需要char格式