Re: Random Number Generation in Forms
From: Thomas Kyte <tkyte_at_us.oracle.com>
Date: Fri, 25 Jun 1999 18:11:02 GMT
Message-ID: <3777c605.85350437_at_newshost.us.oracle.com>
Date: Fri, 25 Jun 1999 18:11:02 GMT
Message-ID: <3777c605.85350437_at_newshost.us.oracle.com>
A copy of this was sent to Robert M. Kopf <rkopf_at_mapmobile.com> (if that email address didn't require changing) On Fri, 25 Jun 1999 17:44:01 GMT, you wrote:
>Is there a random number generator in Forms? I am sure there is but
>the Help-less system for Developer/2000 does not list any. Thanks.
here is a plsql based one. works just like the C rand function (in fact, it is the C rand routine ported to plsql). you might have to loose the pragma for forms...
create or replace package random
is
pragma restrict_references( random, WNDS, RNPS );
procedure srand( new_seed in number );
function rand return number; pragma restrict_references( rand, WNDS ); procedure get_rand( r OUT number ); function rand_max( n IN number ) return number; pragma restrict_references( rand_max, WNDS); procedure get_rand_max( r OUT number, n IN number );
end random;
/
create or replace package body random
is
multiplier constant number := 22695477; increment constant number := 1; "2^32" constant number := 2 ** 32; "2^16" constant number := 2 ** 16; "0x7fff" constant number := 32767; Seed number := 1; -- procedure srand( new_seed in number ) is begin Seed := new_seed; end srand; -- function rand return number is begin seed := mod( multiplier * seed + increment, "2^32" ); return bitand( seed/"2^16", "0x7fff" ); end rand; -- procedure get_rand( r OUT number ) is begin r := rand; end get_rand; -- function rand_max( n IN number ) return number is begin return mod( rand, n ) + 1; end rand_max; -- procedure get_rand_max( r OUT number, n IN number ) is begin r := rand_max( n ); end get_rand_max;
-- begin select userenv( 'SESSIONID' ) into seed from dual; end random; / -- See http://govt.us.oracle.com/~tkyte/ for my columns 'Digging-in to Oracle8i'... Current article is "Part I of V, Autonomous Transactions" updated June 21'st Thomas Kyte tkyte_at_us.oracle.com Oracle Service Industries Reston, VA USA Opinions are mine and do not necessarily reflect those of Oracle CorporationReceived on Fri Jun 25 1999 - 20:11:02 CEST