• Subject: Re: Fastest string scan
  • From: "James W. Kilgore" <qappdsn@xxxxxxx>
  • Date: Thu, 18 Sep 1997 07:42:14 +0100
  • Organization: Progressive Data Systems, Inc.

Denis Robitaille wrote:
> 
> I have an application that display in a subfile a list of all products
> ordered by product number. It shows the product number and the product
> description. The user can request to see only the products that have a
> certain caracter string in their description (Ex: all products with the
> word "ROLLS" in them somewhere). 
<snip>
> What do you think is the fastest way
> to do this?
For really large files, the fastest method I've found is to parse the
words into a separate indexed file, perform a SETLL/READ on the newly
created file then chain to the product file for remaining information.

Naturally, this new file must be maintained along with the product file.

You can build on the search to include and/or logic and wildcard
characters.  Response will be the same no matter how large the file
gets.
+---
| This is the Midrange System Mailing List!
| To submit a new message, send your mail to "MIDRANGE-L@midrange.com".
| To unsubscribe from this list send email to MAJORDOMO@midrange.com
|    and specify 'unsubscribe MIDRANGE-L' in the body of your message.
| Questions should be directed to the list owner/operator: david@midrange.com
+---


This thread ...

Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2019 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].