OCCI - getString() fails in subsequent calls

I am using OCCI to fetch data from a Oracle 9i database with the following code:

        while ( pocciRSet->next () )
        {
          vector<fmDBString> strvec;
          for ( int j=1; j<=nColSize; j++ )
          {
            strvec.push_back ( pocciRSet->getString (j) );
          }
          pvvData->push_back ( strvec );
        }

which is working well for text-only data. If there are columns with numerical values, only the first row is fetched normal, the subsequent rows just get '-~' for each number.

Did anyone of you encounter this particular issue before? How can I solve it?

Thanks in advance, jakob

-- 
jakob kollmann                              www.denimbox.com
denim solutions edv-dienstleistungen und vertrieb ges.m.b.h.