[Zope-dev] ZPatterns + Skinscript

[Joachim Schmitz]

Hi Steve,

thanks for the tips, I try to do it without the ZClass, according to my
understanding, and Phil Eby's reply that should work too, but apparently I
the first one to try it. I try it out.



On Mon, 30 Oct 2000, Steve Spicklemire wrote:

> 
> Hi Joachim,
> 
>    Hmm.. I would start start really simple here, and then 'work up' 
> to the sql query.... Create a default rack with the following 
> SkinScript.
> 
> WITH ['a','b','c'] COMPUTE movie_link=RESULT[0],movie_title=RESULT[1], zeiten=RESULT[2]
> 
> Set the storage for this rack to be a DataSkin derived ZClass loaded by
> accessing attribute 'movie_link'. Then try the following method in the Specialist:
> 
> <dtml-var standard_html_header>
> <dtml-let theItem="getItem('anyOldThing')">
> <dtml-with theItem>
> <dtml-var movie_link>
> <dtml-var movie_title>
> <dtml-var zeiten>
> 
> </dtml-with>
> </dtml-let>
> <dtml-var standard_html_footer>
> 
> If this does what you expect.. then you're getting close. Now change the 
> ['a','b','c'] to be a call to your query:
> 
> WITH yourQuery(... parameters for your query... ) COMPUTE movie_link, movie_title... etc.
> 
> If you get the same errors in the first case.. then your problem has
> nothing to do with SQL.
> 
> -steve
> 
> >>>>> "Joachim" == Joachim Schmitz <js@aixtraware.de> writes:
> 
>     Joachim> On Mon, 30 Oct 2000, Steve Spicklemire wrote:
> 
>     >>  Hi Joachim,
>     >> 
>     >> rackList just refers to the racks in the 'racks' tab of the
>     >> Specialist. Do you have any racks defined for this Specialist?
>     >> The rackList is managed magically with the plug-in-group stuff.
>     >> 
>     Joachim> Yes that's what I found too, but it doesn't work, with
>     Joachim> SQL-database and SkinScripts, the setup is described
>     Joachim> below:
> 
>     >> >>>>> "Joachim" == Joachim Schmitz <js@aixtraware.de> writes:
>     >> 
>     Joachim> for debugging I inserted in Specialists.py in getItem:
>     >>
>     Joachim> return str(self.rackList) <-- inserted for rack in
>     Joachim> self.rackList: item = rack.__of__(self).getItem(key) if
>     Joachim> item is not None: return item
>     >>
>     Joachim> this alway returns an empty list, when calling it from
>     Joachim> the dtml:
>     >>
>     Joachim> <dtml-var "getItem(_.int(609))"> returns "[]"
>     >>
>     Joachim> I tried to follow the magic how this rackList is setup,
>     Joachim> but it is to much python-Zen for me.
>     >>
>     Joachim> On Sun, 29 Oct 2000, Joachim Schmitz wrote:
>     >>  >> On Sat, 28 Oct 2000, Phillip J. Eby wrote:
>     >> >> 
>     >> >> > At 05:17 PM 10/28/00 +0200, Joachim Schmitz wrote:
>     >> >> > >
>     >> >> > >select e.event_id as event_id > >,e.zeiten as zeiten > >>
>     >> >,v.firma as firma > >,v.tel as tel > >,e.movie_id as movie_id
>     >> >> > >,m.movie_title as movie_title > >,m.movie_link as
>     >> movie_link >> > >,m.movie_text as movie_text > >,e.datum_von as
>     >> datum_von > >> >,e.datum_bis as datum_bis > >from event as e,
>     >> veranstalter as >> v, movies as m > >where > >e.event_id =
>     >> <dtml-sqlvar e_id >> type=int> > >and e.movie_id = m.movie_id
>     >> and e.veran_id = >> v.veran_id > >order by m.movie_title
>     >> >> > 
>     >> >> > Just out of curiosity, why do you have an "order by"
>     >> clause, >> if this is > supposed to only return one row?  If
>     >> more than one >> item is returned by this > query, only the
>     >> first will be used >> to supply data to your DataSkin.
>     >> >> > 
>     >> >> that was just left over from an reused query-template, I
>     >> forgot >> to take it out.
>     >> >> 
>     >> >> > 
>     >> >> > >I also added a SkinScript method as a Data Plug-in in the
>     >> >> defaultRack like > this
>     >> >> > >
>     >> >> > >WITH QUERY readEvents(e_id=self.event_id) COMPUTE >>
>     >> zeiten,firma,tel > >,movie_id,movie_text,movie_link,movie_title
>     >> >> > >,datum_von,datum_bis,zeiten
>     >> >> > 
>     >> >> > Do you have some way of providing self with an "event_id"
>     >> >> value?  Keep in > mind that when DataSkins are created, they
>     >> >> have only an "id" attribute, > nothing else.  So unless you
>     >> >> have an attribute provider that provides an > "event_id"
>     >> value, >> this statement will fail.  Perhaps what you actually
>     >> mean > is:
>     >> >> > 
>     >> >> > WITH QUERY readEvents(e_id=self.id) COMPUTE > event_id, >
>     >> >> zeiten,firma,tel, >
>     >> movie_id,movie_text,movie_link,movie_title, >> >
>     >> datum_von,datum_bis,zeiten
>     >> >> > 
>     >> >> > Notice that I'm passing self.id to readEvents, and that
>     >> I've >> added event_id > to the list of attributes retrieved
>     >> from the >> query.
>     >> >> > 
>     >> >> how do I set "self.id" I tried in dtml-method in the >>
>     >> event-specialist: There is a event_id 609 in the table:
>     >> >> 
>     >> >> <dtml-var "getItem(_.int(609))"> returns none or <dtml-var
>     >> >> "getItem(key=_.int(609))"> returns none
>     >> >> 
>     >> >> 
>     >> >> > 
>     >> >> > >under the storage tab I selected for:
>     >> >> > >
>     >> >> > >Class to use for stored items: ZPatterns:DataSkin and
>     >> >> > >
>     >> >> > >Objects are: o stored persistently.  > > x loaded by >>
>     >> accessing attribute: event_id
>     >> >> > 
>     >> >> > This will work fine, if you use the revised SkinScript
>     >> above.  >> You will > probably want to create a ZClass subclass
>     >> of >> DataSkin at some point to use > instead, so that you can
>     >> define >> permissions, methods, and so on for your > Event
>     >> objects.
>     >> >> > 
>     >> >> > 
>     >> >> 

Mit freundlichen Grüßen

Joachim Schmitz  

          
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