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Home > Forums > Programmers > DBMS Packages > PostgreSQL Inc.: PostgreSQL Forum

Help! I need a function to look up the geography for an IP address

thread699-1647018
Read More Threads Like This One
adventurous1 (Programmer)
30 Apr 11 11:38
Hi all...

I need help in writing a FUNCTION that will take an IP address and look it up in another table and return its corresponding geography values.(

A function is needed as I have millions of records to lookup and brute force SQL does not perform well.)

source record:

IP Address    Date
155.44.33.91  4/1/2011

lookup table:

start_ip      end_ip            city     state  zip
155.44.33.1   155.93.22.200     lakeland tx     55495
197.65.39.8   198.33.95.12      plano    ca     85167

Can someone help me with an answer?  Thanks!
feherke (Programmer)
30 Apr 11 13:01
Hi

Just a simple query like this could not be optimized neither with a stored function :

CODE

select
*
from adventurous1_table
where '155.44.33.91' between start_ip and end_ip
So what should actually happen with the result of the lookup ?
 

Feherke.
http://free.rootshell.be/~feherke/

adventurous1 (Programmer)
30 Apr 11 15:19
Result would be the original ip address and the extended attributes of the ip address, i.e. city, state, zip.
feherke (Programmer)
1 May 11 6:04
Hi

That is not a reason to use stored function. There is nothing a function can do and a regular query can not.
 

Feherke.
http://free.rootshell.be/~feherke/

feherke (Programmer)
1 May 11 10:18
Hi

Quote (adventurous1):

A function is needed as I have millions of records to lookup and brute force SQL does not perform well.
From another point of view : if your current query is slow, post it so we can analyze it. Also post the exact table structure including constraints and indexes.
 

Feherke.
http://free.rootshell.be/~feherke/

adventurous1 (Programmer)
1 May 11 11:52
A function will be more efficient going through a collection of records.  The query basically is a join on ip address to retrieve extended attributes per above.

select a.ip_address, b.city, b.state, b.zip
from ip_address
where a.ip_address is between b.start_ip and end_ip

There has to be a better way of doing this, as the performance over millions of records is horrible.
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