ODBC Database connenction to ACCESS Database

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 mista

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 .

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ThorsFeldherr

Beginner

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Posts: 3

Location: Bavaria/Germany

Occupation: Master of Engineering

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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?

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ThorsFeldherr

Beginner

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Posts: 3

Location: Bavaria/Germany

Occupation: Master of Engineering

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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
1 2 3 4 5 6	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