You might want to look at 'sqlos', a SQLObject support package for Zope 3.

SQLObject is an object-relational mapper for Python.

Between the two of them, the SQL side of your ITrackContainer and
ITrack is taken care of transparently. So with just a little bit of
work, you can then write your application pretty much like any other
ZODB based Zope 3 application.

On 6/28/05, Christoph Frick <[EMAIL PROTECTED]> wrote:
> hiho,
> i am currently in the process of rewriting an application, which is used
> to upload laptimes of racing simulations from users and allow comparing
> them. this application is done TTW using zope2.
> now i want to turn this into a product and also use zope3 to see how
> things handle there for projects at work or for other freetime projects.
> my genercal concern about all this is, how would a write such an
> application. using a relational database is an absolute must and its
> also no big deal. using SQLScript objects on the fly in the code by
> acquiring the name of the dba from the parent object is no big deal.
> the bigger problem here is, that i need some guidance, how to design the
> application. all the things i read about zope3 (the two pdfs from
> jfulton and srichter and the examples from the worldcookery) are good
> for handling all the stuff needed to write apps, that store there stuff
> in the zodb and evolve around some certain dataobject.
> for my app i have e.g. a track list - this is some sort of singleton for
> the app: it holds a list of all tracks - for which a driver, beside
> othere "keys", can register laptimes. what i did now is to define an
> ITrack and an ITrackContainer - the container handles the SELECT,
> INSERT, DELETE - the ITrack the UPDATE. i guess with some help of the
> general View class i can also add later a simple form for editing the
> tracks. using a contents-view for the container then would allow me to
> browse the tracks even without writing a new view for this.
> but how do i add my "tracks" instance of the ITrackContainer to my
> "root"? i tried adding it as property - it wont get found. maybe this is
> a wrong approach how to develop and design things at all with zope3?
> any url with examples, applications or code, how to develop "big"
> applications, that utilize external databases are highly appreciated.
> --
> cu
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