/*
 * call-seq:
 *    res.nparams() -> Fixnum
 *
 * Returns the number of parameters of a prepared statement.
 * Only useful for the result returned by conn.describePrepared
 */
static VALUE
pgresult_nparams(VALUE self)
{
        PGresult *result;

        result = get_pgresult(self);
        return INT2FIX(PQnparams(result));
}