[Tutor] Classes and Databases

[Rich Lovely]

Jojo, am reading your problem correctly?

If you have (for example) x=2 and y=4, you want the database to return  
functions like x+2, 2x and 3x-2? (I know this is probably much simpler  
than the actual functions you'll be using).

And you the want to use those functions in your code?

@list: pickle?

---
Richard "Roadie Rich" Lovely
Part of the JNP|UK Famille
www.theJNP.com

(Sent from my iPod - please allow me a few typos: it's a very small  
keyboard)

On 14 Nov 2008, at 04:42 PM, "Jojo Mwebaze" <jojo.mwebaze at gmail.com>  
wrote:

> Sorry Alan,
>
> What u described below is exactly what i want to do..  if given x, y  
> as two datatums and such that f(x) --> y, given y can we determine f  
> or x?
>
> Assuming the x, y and f are stored in the database, then we can be  
> able to write queries to search/extract for the f's that are  
> responsible for the 'y' or use links, database catalogs etc
>
> Thanks for the help.
>
> Johnson
>
>
>
>
> On Fri, Nov 14, 2008 at 2:21 AM, ALAN GAULD  
> <alan.gauld at btinternet.com> wrote:
> > Thanks Allan... we have used CVS for the base system.. but for  
> users provided functions,
> > we think for having them persistent in the database..
>
> I'm puzzled. CVS provides much better facilities for handling code,  
> especially with multiple
> versions (visibility of diffs, who changed what and when etc) that I  
> can't think of a single
> good reason to put it in a database. I can see the point of using a  
> database as an indexing
> system for searching, filtering etc but storing code in a database,  
> extracting it and then trying
> to execute it is just so much more difficult than  fetching a  
> version file and importing
> or running it directly. Plus you need to write a basic version  
> control system on top of
> the database anyway.
>
> I really think I must be missing something about your requirements?
>
> Alan G
>
>
> On Thu, Nov 13, 2008 at 7:18 PM, Alan Gauld  
> <alan.gauld at btinternet.com> wrote:
>
> "Jojo Mwebaze" <jojo.mwebaze at gmail.com> wrote
>
>
> Because we have very many such cases, we can not incorporate such  
> adhoc
> changes in the system..  we are thinking of storing  such classes in  
> the
> database and have  classes run from the database. if anyone else  
> feels they
> need to use someone's algorithm, they can run it/or extract it from  
> the
> database and run on it on their data.
>
> Sorry if I'm missing the point but this sounds like a traditional  
> version
> control system like CVS or SVN would do the job using the normal
> python files.
>
> Or is that too simple?
>
> -- 
> Alan Gauld
> Author of the Learn to Program web site
> http://www.freenetpages.co.uk/hp/alan.gauld
>
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