Re: Best Way To Lookup From a Huge Table
Re: Best Way To Lookup From a Huge Table
- Subject: Re: Best Way To Lookup From a Huge Table
- From: John Stiles <email@hidden>
- Date: Fri, 14 Mar 2008 17:55:42 -0700
Frankly, if it's just a table of 100,000 NSNumbers pointing to
8-character strings, CoreData seems a little excessive to me. The table
can live in RAM and it shouldn't cause any problem.
Chris Hanson wrote:
On Mar 13, 2008, at 2:11 PM, Karan Lyons wrote:
What's the best way to lookup something from a huge table?
I'm trying to write a piece of code that checks weather data
given a zipcode. But I first need to change that zipcode into another
format in order for it to work with the online service I'm querying.
For example:
1) User inputs zipcode 02139.
2) Application looks up zipcode in table and finds that 02139 is
USMA0007
3) Application uses code USMA0007 to query the online service.
One other thing you could do is use Core Data with a SQLite persistent
store that you generate during development, and embed as a resource
within your application and add read-only to a coordinator.
Under Leopard you can specify that the code attribute of your zip code
entity is indexed for faster retrieval. Core Data will also do the
work of ensuring you don't pull in the whole (1MB or whatever)
database just for a couple searches.
You could also use SQLite directly, but it'd be so easy to use Core
Data for this that it's probably the first thing I'd try. I'd
probably do so by creating a separate tool to generate the persistent
store from a downloaded XML file (or whatever it is that you get the
data from initially), and calling that tool from my build process via
a build rule in my app target.
-- Chris
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