Re: F Specs on an OVRDBF

Denis is right, but on the note of what do your F-Specs need to look like?

Your F-Specs do not really need to change at all.  The logic in your program
may need to change if it is a different type of key, but if it is the same key 
read
in both files, your RPG program will have no idea if it's reading a physical 
file
or a logical file.  They both look exactly the same to the RPG program, and you
treat them exactly the same way.  That is the magic of OVRDBF and logicals.

Regards,

Jim Langston

Denis Robitaille wrote:

> You can do it with OVRDBF but I would not. But first, let supposed that you 
>do go the OVRDBF way.
>
> Lets say that your logical are named P701L1 and P701L2. In your F spec use 
>P701L1 and in your CL
> you use one of the 2 following override depending on which vendor you want to 
>access:
> OVRDBF (P701L1) to (P701L1)
> or
> OVRDBF (P701L1) to (P701L2)
>
> That will work.
>
> But then again, I think that this is a bad way to solve this problem. What if 
>you add another vendor, you will have to had a new logical and you will have 
>to modify the CL. And what if you change a vendor number ...
>
> A better approach would be:
>
> - create one logical file (lets call it P701L1) with the key made of the 
>vendor number and the product number next.
> - then you pass as a parameter to your RPG program the vendor number that you 
>want to work with.
> - In the RPG program, use the READE opcode instead of the READ opcode (look 
>up the manual, you will understand the difference) to extract record from the 
>P701L1 file
>
> This way, you will need just one logical file regardless of the number of 
>vendor and this way, any change in the number of vendor or their id will have 
>no impact on the CL or RPG program
>
> Hope this help.
>
> Denis Robitaille
> Directeur services techniques
> Cascades Inc
> 819 363 5187
> fax 819 363 5177
>
> >>> LCobb@PapaGinos.com 06/08/00 02:25pm >>>
>
> Salutations,
>
> I have a product master file (P701).  I had to write the online maintenance
> in such a way that when the DP clerk selects product maintenance they are
> prompted as to which vendor they wish to do maintenance on.  So only those
> products with that particular vendor code are accessible through
> maintenance.  I created two logicals utilizing the select.  One for each
> vendor.
> I know I can do it with BLDQRYSLT, but I prefer to try to utilize OVRDBF in
> my CLP.  I have only been programming for a year.  I am self taught and I
> want to get a better grasp on this OVRDBF.  My boss allows me to learn
> everything I can, to try new approaches whenever possible, and get exposure
> on all that RPG, CL, and SQL has to offer. (RPGIV is coming soon). That is
> why I am choosing OVRDBF (if it is possible).
> My question is (because my boss is on vacation) what do my Fspecs need to
> look like?  I have looked in all the manuals and infoseeker but I can't find
> this info.
> I am thinking my CL should be:
> OVRDBF (PFILE) TO (VENDOR CODE SPECIFIC LFILE)
>
> Should my Fspecs contain only the PFILE (update) or do I need the
> LFILE's(input) in there also?
>
> Am I even close with this?  Am I wrong in thinking that it can be done this
> way?
>
> Thank you in advance for any info or insight you can shed on this matter.
>
> LAC
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