Re: Fastest string scan

["Joe Teff" <jteff19@xxxxxxx>]

I would choose a different method than reading the entire file regardless of 
how you scan the records in your program. I would choose a way to use a 
wildcard search in OPNQRYF or imbedded SQL. If all you have to do is show them 
a list, I would suggest using a query. The selection would look like

          ITEMNO    EQ      '%ROLLS%'

When you run the query, use RUNQRY QRYNAME RCDSLT(*YES) OUTPUT(*DISPLAY). This 
will show the record selection prior to running the query and then show the 
results on the screen. Not very fancy, but very effective.

Joe Teff
QDS
Bloomington, MN
----------
> From: Denis Robitaille <drobitaille@Cascades.com>
> To: MIDRANGE-L@midrange.com
> Subject: Fastest string scan
> Date: Wednesday, September 17, 1997 4:41 PM
> 
> 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). To do that, they type the string to
> look for and the program read the file by product number and, for each,
> scan the description for the string. The string can be anywhere in the
> product description. Currently, i use the SCAN opcode to do the
> scanning. It works great in the test environnement but in production
> (with a lot more products), it is way to slow. I do load the subfile a
> page at a time. I think the delay is due to the SCAN opcode and i am
> thinking of replacing it with the QCLSCAN API. But before going any
> further, i tought i'd ask around. What do you think is the fastest way
> to do this?
> Any help would be apriciated
> -- 
> Denis Robitaille
> Cascades Inc.
+---
| 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
+---