Re: Fastest string scan

[Pat Barber <MBOCEANSIDE@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

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). 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.
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I have done a similar thing using opnqryf with the *ct operator which
looks for an occurence in a string, it doesn't work at the speed of
light
but it is acceptable..... What you are trying to do is slow by it's very
nature, so you have to accept some compromise... try somthing along
these
lines....

1. Prompt for string
2. opnqryf with contains string
3. call subfile program
4. goto top for another search
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