private static uint doPrefixCompare(
            IntPtr dbp, IntPtr dbtp1, IntPtr dbtp2)
        {
            DB  db   = new DB(dbp, false);
            DBT dbt1 = new DBT(dbtp1, false);
            DBT dbt2 = new DBT(dbtp2, false);
            SecondaryBTreeDatabase tmp =
                (SecondaryBTreeDatabase)db.api_internal;

            return(tmp.prefixCompareHandler(
                       DatabaseEntry.fromDBT(dbt1), DatabaseEntry.fromDBT(dbt2)));
        }