Re: dotted quad netmask conversion

[Steve Clark <sclark@xxxxxxxxxxxxx>]

On 12/07/2010 10:30 AM, Jon Nelson wrote:

On Tue, Dec 7, 2010 at 9:17 AM, Steve Clark <sclark@xxxxxxxxxxxxx> wrote:
  

Hello All,

I am working with a postgresql database that has two columns.
One for an ip address and another for the netmask. Both of these
columns are char varying(30). I would like to convert to just
one column as inet. Any one know a slick way to convert the
dotted quad netmask, E.G. 255.255.128.0, to number of bits. I didn't
see any way directly looking at the network functions in the PG
documentation.
    

select '1.2.3.4'::inet & '255.255.128.0'::inet;
or
select CAST('1.2.3.4' AS INET) & CAST('255.255.128.0' AS INET);

Be aware that CIDR representation is not as granular as netmask.

http://www.postgresql.org/docs/8.4/interactive/functions-net.html

  

Thanks for the response Jon. I should have stated this PG 8.1.x and '&' doesn't exist
for network functions.

select CAST('1.2.3.4' AS INET) & CAST('255.255.128.0' AS INET);
ERROR:  operator does not exist: inet & inet
HINT:  No operator matches the given name and argument type(s). You may need to add explicit type casts.

--
Stephen Clark
NetWolves
Sr. Software Engineer III
Phone: 813-579-3200
Fax: 813-882-0209
Email: steve.clark@xxxxxxxxxxxxx
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