Increment the row by one. Determine whether another row exists that
meets the selection criteria. The _fetchRow method is used here instead of
_getRow method. This approach works because the data set model object was
initialized with the dataset data vector object. (See the fourth statement
in this example, which uses the LOADCLASS and INSTANCE functions.)
row + 1;
call send( datid, '_fetchRow',
row, eod );
end;