/*
 * 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));
}