ODBC Driver Manager Function sequence error (MS SQL Server 2005)

When I was trying to read some data from ODBC driver, that configured to link to MS SQL Server 2005, I ran the following code:

QSqlDatabase db = QSqlDatabase::addDatabase( "QODBC" );
db.setDatabaseName( "Driver={SQL Server Native Client 11.0};Server=COMPUTER_NAME\\SQLEXPRESS;Database=DATABASE_NAME;" );
db.open( "user", "password" );
QSqlQuery q( "SELECT field_name FROM table_name", db );
q.exec(  );

exec() returns false and there is the following message in output window:

QODBCResult::exec: Unable to execute statement: " Microsoft ODBC Driver Manager Function sequence error"

But if I run the following code:

...
QSqlQuery q( db );
q.exec( "SELECT field_name FROM table_name" );

then everything works as expected