OMG! Jacques gave a perfect example using pattern matching, and Jared
didn't agree that it was the cat's meow to do it that way! :)
-----Original Message-----
Sent: Tuesday, March 25, 2003 2:50 PM
To: Multiple recipients of list ORACLE-L
Here's one way to do it:
create table ip ( ip_address varchar2(15) );
insert into ip values('10.0.112.1');
insert into ip values('10.0.113.1');
insert into ip values('10.0.113.2');
insert into ip values('10.0.12.1');
insert into ip values('10.0.78.1');
commit;
create or replace function ipsort ( ip_address_in varchar2 )
return number
is
nip number;
o1 varchar2(3);
o2 varchar2(3);
o3 varchar2(3);
o4 varchar2(3);
begin
/* this function assumes a complete ip address of nnn.nnn.nnn.nnn
though the number of digits in each octet does not need to be
three, just >= 1
*/
o1 := substr(ip_address_in,1,instr(ip_address_in,'.',1)-1);
o2 := substr(ip_address_in,instr(ip_address_in,'.',1,1)+1,
(instr(ip_address_in,'.',1,2)-1) - (instr(ip_address_in,'.',1,1)));
o3 := substr(ip_address_in,instr(ip_address_in,'.',1,2)+1,
(instr(ip_address_in,'.',1,3)-1) - (instr(ip_address_in,'.',1,2)));
o4 := substr(ip_address_in,instr(ip_address_in,'.',1,3)+1);
nip := (to_number(o1) * 16 * power(2,20)) + ( to_number(o2) * 64 *
power(2,10) ) + ( to_number(o3) * 256 ) + to_number(o4);
return nip;
end;
/
select ip_address
from ip
order by ipsort(ip_address)
/
IP_ADDRESS
---------------
10.0.12.1
10.0.78.1
10.0.112.1
10.0.113.1
10.0.113.2
5 rows selected.
Jared
Ray Stell <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
03/25/2003 09:54 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: sort ip addresses
Need a trick to sort ip addresses into numerical order. I have them
stored as varchar2. If I select without a sort I get rows
in order of their character value:
10.0.112.1
10.0.113.1
10.0.113.2
10.0.12.1
10.0.78.1
I'd like to order them numerically within the octets:
10.0.12.1
10.0.78.1
10.0.112.1
10.0.113.1
10.0.113.2
===============================================================
Ray Stell [EMAIL PROTECTED] (540) 231-4109 KE4TJC 28^D
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Author: Ray Stell
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