ODBC Database connenction to ACCESS Database

Hey guys,

I got a little problem with the QODBC database connection. I have to open and use a ACCESS databasefile (.accdb) within my Qt programm, but I can't get it run. I think there is a mistake in the database name but I am not that familiar with database handling so I need a little help with this. I started a simple mainwindow projekt and put all the database stuff in the main function. Here is the code:

Source code

 
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#include 
#include "mainwindow.h"

#include 
#include 
#include 

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

    QSqlDatabase datab = QSqlDatabase::addDatabase("QODBC");

    QString databasename = "DRIVER={Microsoft Access Driver (*.accdb)};FIL={MS Access};DBQ=C://Users/Thor/Pers/Projekt Madinger/Datenbank/Daten_Hauptprogramm.accdb";

    datab.setDatabaseName(databasename);


    if(!datab.open())
    {
    datab.setConnectOptions();
    return 1;
    }
    else
    return 0;
    
    return a.exec();
}


I can run the project without any problems but the open() funktion alway returns false. Maybe its just a noob mistake but it drives me crazy   .
  •  Quote

ThorsFeldherr

Beginner

  •  

Posts: 3

Location: Bavaria/Germany

Occupation: Master of Engineering

2

Friday, February 24th 2012, 5:53pm

 

Ok now I am a little bit further. I debugged it and I cant connect because of this error:

[Microsoft][ODBC Driver Manager] Der Datenquellenname wurde nicht gefunden, und es wurde kein Standardtreiber angegeben

in English: The data source name not found and no default driver specified

Can you help me?
  •  Quote

ThorsFeldherr

Beginner

  •  

Posts: 3

Location: Bavaria/Germany

Occupation: Master of Engineering

3

Friday, February 24th 2012, 7:38pm

 

Ok I got it by myself. I post the solution in case anyone else has the same problem. 

I use windows 7, 32 bit. If you want to use a database from type .mdb or .accdb with ODBC you have to register the database as datasource before you can use it via C++ in any case. It is rather simple to to do:

You go into start->system
type ODBC into the search field
the result is datasource(ODBC)-> click it
Under "User-DSN" you can add a new source
you have to choose a database (which is the one you want to use) and you can give it a sourcename for example "YOURSOURCE"

After you have done that you can call the database like that:

Source code

 
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QSqlDatabase datab = QSqlDatabase::addDatabase("QODBC");

QString databasename = "YOURSOURCE";
datab.setDatabaseName(databasename);

datab.open();


Now it works! 

本文来源：http://www.qtforum.org/article/37487/odbc-database-connenction-to-access-database.html