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Thread: Column and rows are showing empty in tableView

  1. #1
    Join Date
    Apr 2014
    Posts
    9
    Qt products
    Qt4
    Platforms
    Unix/X11

    Default Column and rows are showing empty in tableView

    Hello !!!

    I am trying to load my data base table to tableView.I have written the following piece of code.


    void UserLog:n_pushButton_7_clicked()
    {
    login conn;
    QSqlQueryModel *modal =new QSqlQueryModel;
    conn.connOpen();
    QSqlQuery* qry = new QSqlQuery(conn.db);
    qry->prepare("select * from `posdb`.items");
    if(qry->exec())
    {
    modal->setQuery(*qry);
    ui->tableView->setModel(modal);
    conn.connClose();
    }
    else
    {
    QMessageBox::critical(this,tr("error::"),qry->lastError().text());
    }

    qDebug() <<(modal->rowCount());
    }

    It is successfully loading the table.But the problem is that the table fields are emptyuser login11.jpg
    I do not guess what is the wrong with my code.I am using the following version of Qt user login12.jpg
    My database table is user login13.jpg

    I am afraid what to do.
    Help !!!
    Thanks

  2. #2
    Join Date
    Mar 2009
    Location
    Brisbane, Australia
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    Qt products
    Qt4 Qt5
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    Wiki edits
    17

    Default Re: Column and rows are showing empty in tableView

    You immediately close the database connection that the model is using to access your database. After this the behaviour of the model is undefined. If you want a one-off load of the table data into a widget then you should use QTableWidget and iterate over a QSqlQuery to populate it before closing the connection.

    It would be unusual to open/close the database connection in a button handler slot.

  3. #3
    Join Date
    Apr 2014
    Posts
    9
    Qt products
    Qt4
    Platforms
    Unix/X11

    Default Re: Column and rows are showing empty in tableView

    Thanks @Chris i got your point and i got the job done

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