Re: Random Number Generator In PL/SQL
From: Thomas Kyte <tkyte_at_us.oracle.com>
Date: 1997/07/21
Message-ID: <33d378c6.5389900_at_newshost>#1/1
Date: 1997/07/21
Message-ID: <33d378c6.5389900_at_newshost>#1/1
On 18 Jul 1997 16:57:36 GMT, Anthony B. Cillo <tmaxwell_at_crl.crl.com> wrote:
>Anyone have any code to do this?
>
>
>Thanks
>
>Tony
>
Here is one....
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; / Thomas Kyte tkyte_at_us.oracle.com Oracle Government Bethesda MD http://govt.us.oracle.com/ -- downloadable utilities ---------------------------------------------------------------------------- Opinions are mine and do not necessarily reflect those of Oracle CorporationReceived on Mon Jul 21 1997 - 00:00:00 CEST