Using two separate databases over ODBC inside a class fails

[Tiansen]

I want to use two separate databases over ODBC in my application.

If I do something like this:

db_serno=QSqlDatabase::addDatabase("QODBC");
 
db_serno.setDatabaseName("AccDB");
 
db_serno.open();
db_serno.exec(<SQL_QUERY>); <-- query performs successfully
 
db=QSqlDatabase::addDatabase("QODBC"); // trying to add another ODBC connection to another DB
 
db_serno.exec(<SQL_QUERY>); <-- query fails (last error is: Driver not loaded)

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

db_serno.setDatabaseName("AccDB");

db_serno.open();
db_serno.exec(<SQL_QUERY>); <-- query performs successfully

db=QSqlDatabase::addDatabase("QODBC"); // trying to add another ODBC connection to another DB

db_serno.exec(<SQL_QUERY>); <-- query fails (last error is: Driver not loaded)

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It seems that second addDatabase() somehow corrupts also the first odbc object. Obviously I am doing something wrong, how can I fix it?