Re: EAV (Re: Object-relational impedence)
Date: Sat, 29 Mar 2008 15:37:13 GMT
Message-ID: <JmtHj.30759$R84.5485_at_newssvr25.news.prodigy.net>
"Dmitry A. Kazakov" <mailbox_at_dmitry-kazakov.de> wrote in message
news:e5lufueeu155.t1s8vlmxjhpt.dlg_at_40tude.net...
> On Sat, 29 Mar 2008 04:47:01 GMT, Brian Selzer wrote:
>
>> There is a table for attributes that are common to all
>> possible widgets, and a table for each set of attributes that are common
>> not
>> to all possible widgets, but rather to a subset of all possible widgets.
>
> It is interesting to see people reinventing the wheel (class). The set of
> "all possible widgets having attributes T, U, V" is a class.
>
> But that is not my point. The problem with widgets hierarchy is that there
> are three axes of widget relations. You were discussing only one of them
> attributes, which is usually directly mapped to types. This is not that
> big
> deal. More difficult are other two:
>
> 2. Visual containment. Widgets can consist of / contain other widgets.
>
> 3. Signal handing. Handlers of widget events are composed in a certain
> hierarchical way.
>
> --
> Regards,
> Dmitry A. Kazakov
> http://www.dmitry-kazakov.de
Received on Sat Mar 29 2008 - 16:37:13 CET