RECID *getdbtblrow(DBTBL *db);
Reads the next row in from a table. The data can be retrieved by calling getfld() on a field previously returned by dbnametofld().
Returns the location of the row retrieved. If recidvalid() fails on the result then there were no more rows.
putdbtblrow(), getfld(), dbnametofld(), recidvalid()