db is not open when called the second time

[gabor53]

@SGaist
You mean the main function of MainWindow_

[SGaist]

No, I mean main in your main.cpp

[gabor53]

@SGaist
I did the following:

#include "mainwindow.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;

    QSqlDatabase db;
    QString fileQstring = "C:/Programming/Projects/FolkFriends_1_0/db.db";


    db = QSqlDatabase::addDatabase ("QSQLITE");
    db.setDatabaseName (fileQstring);
    qDebug() << "Connection Display created in connection(). ";

    bool OK = db.open ();

    if(OK == true)
        {
            qDebug() << "The db (MainWindow) is open!";
        }
    else
        {
            qDebug() << "The db (MainWindow) is not open!";
        }

    if(!db.open ())
        {
            qDebug() << "The database (db) is NOT open!" << db.lastError ();

        }

    db.open();

    w.show();

    return a.exec();
}

I still get
The query is NOT active. QSqlError("", "Driver not loaded", "Driver not loaded")

[SGaist]

What version of Qt are you using ?

Do you have write access to that location ?

[gabor53]

@SGaist
Yes . I have write access. Using Qt 5.7 on Windows 10

[SGaist]

Are you experiencing that using Qt Creator to start your application ?

[gabor53]

@SGaist
It starts ok.

[gabor53]

@gabor53
I think the problem is that it first executes function Addview() from mainwindow.cpp. this crates the first half of the messages:
QSqlQuery::exec: database not open
The query is NOT active. QSqlError("", "Driver not loaded", "Driver not loaded")

After mainwindow.cpp it executes main.cpp where I create the db connection and open the db. This gives normal messages:

Connection Display created in main.cpp.
The db (MainWindow) is open!

Clearly the problem is that it tries to run the query before it opens the db. I just still don't know why it processes mainwindow.cpp first and main.cpp second.

[jsulm]

@gabor53 Then move

MainWindow w;

after setting up the connection.

[gabor53]

@jsulm
This worked. Thank you.