/*
 * call-seq:
 *    res.paramtype( param_number ) -> Oid
 *
 * Returns the Oid of the data type of parameter _param_number_.
 * Only useful for the result returned by conn.describePrepared
 */
static VALUE
pgresult_paramtype(VALUE self, VALUE param_number)
{
        PGresult *result;

        result = get_pgresult(self);
        return INT2FIX(PQparamtype(result,NUM2INT(param_number)));
}