cmd_tuples (PGresult)

    /*
     * call-seq:
     *    res.cmd_tuples() -> Fixnum
     *
     * Returns the number of tuples (rows) affected by the SQL command.
     *
     * If the SQL command that generated the PGresult was not one of:
     * * +INSERT+
     * * +UPDATE+
     * * +DELETE+
     * * +MOVE+
     * * +FETCH+
     * or if no tuples were affected, <tt>0</tt> is returned.
     */
    static VALUE
    pgresult_cmd_tuples(VALUE self)
    {
            long n;
            n = strtol(PQcmdTuples(get_pgresult(self)),NULL, 10);
            return INT2NUM(n);
    }