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Editorial Team
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Asked: 2026-05-22T23:21:16+00:00

My application uses Qt SQL this way QSqlDatabase db = QSqlDatabase::addDatabase(QODBC); db.setDatabaseName(DRIVER={Microsoft Access Driver

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My application uses Qt SQL this way

QSqlDatabase db = QSqlDatabase::addDatabase("QODBC");
db.setDatabaseName("DRIVER={Microsoft Access Driver (*.mdb)};DBQ="+QDir::currentPath()+"/database.mdb");

and all the rest is done using QSqlRelationalTableModel.

Now that deployment stage has come, the application works perfectly on the system where Qt (4.6.3) is installed , but on another clean system, there is this error while loading the database

"Driver not loaded"

I know this has something to do with copying the ODBC plugins… but simply copying qsqlodbc4.dll to the app dir and 

qApp->addLibraryPath(QDir::currentPath());

does not work!!

What is the solution to this?

Note: The app is not linked to the driver DLL, it uses Qt plugin mechanism.

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1 Answer

  1. Editorial Team

    Create this directory structure same as it was on pc having qt installation.

    your.app.dir/plugins/your.plugin.folder (i.e your.plugin.folder is sqldrivers)

    Copy your plugin under your.app.dir/plugins/your.plugin_folder

    Then add this code

    qApp->addLibraryPath( qApp->applicationDirPath() + "/plugins");

    I hope this helps.

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