Thank you for your responses! I have read the book, things are clearer now. I will come back with further questions about locking and long running requests...
Best regards Andre On 07.10.2017 16:14, Markus Ruggiero wrote: > Andre, > > please take this seriously > > Chick Hill wrote: > >> And it will also show you the correct and effective way to leverage WO >> and Wonder. The architecture is quite different from most other >> frameworks and if you don’t make the adjustment to that, you will be >> forever struggling against the intention of the frameworks. > > One important thing to note (and this seems to be a major stumbling > block for all non-WOers): We are programming objectoriented, we are not > programming SQL / database stuff!! > > When you think "OO" you think "object". An object encapsulates state and > shows behavior. When you start to learn oo-programming you usually have > instance variables and methods. The object's state is kept in the > instance vars and the behavior is defined by the methods. It is good and > strongly recommended style to make instance variables private (or maybe > proteced) and create public accessors (getter and setter methods). One > should never access an object's state directly (instance variables) from > outside the object but access them through the getter and setter > methods. This allows the object (actually the programmer writing the > class) to re-implement the internal representation of state in any way > that makes sense. Any piece of code using the getter/setter methods > won't be affected by that. > > The EOF allows you to implement objects in a way so that their internal > state is not kept in instance variables but is connected to a database > record. Correct oo-thinking says "I access the object's state via > accessor methods. I don't care where/how the object manages to store > that state". Your enterprise objects are based on classes that inherit > from framework classes. There is functionality in those classes to > pull/push state to/from a relational database. You as the "user" of the > object DO NOT CARE! The EOF framework manages this for you. > > You MUST NOT THINK "database/table/record" but THINK "OBJECT". > > Instead of asking "how do I retrieve customer records from the > database?" you should think "how do I make the framework give me a list > of customer objects that have their state backed by a record in the > database?". With this in mind EOF becomes almost trivial to use. Any > programmer coming from "standard java" background has a problem with > this thinking because most persistence frameworks are more or less > nicely built "sql generators". Thus one's thinking is often closer to > "data record" instead of "object". Not so with Wonder and EOF. Just > think "object" and you are all set. > > With the EOModel you basically tell the EOF framework how to "map object > thinking into a relational database". Let the framework do it, you are > an oo-programmer! > > Hope this clears things a bit. > > Have fun > ---markus--- > > >> On 6 Oct 2017, at 16:38, André Rothe <andre.ro...@zks.uni-leipzig.de >> <mailto:andre.ro...@zks.uni-leipzig.de>> wrote: >> >> Hi Markus, >> >> I'm on part C of the book... >> >> Best regards >> Andre >> >> On 06.10.2017 15:51, Markus Ruggiero wrote: >>> Hi Andre, >>> >>> I am the author of Learning the Wonders. If you have any question >>> regarding the book you can reach me here or directly by writing to >>> aut...@learningthewonders.com <mailto:aut...@learningthewonders.com> >>> <mailto:aut...@learningthewonders.com>. >>> I'll be glad to help you get started. >>> >>> ---markus--- >>> >>> PS >>> Chuck and Theo, thanks for the recommendation :-))) >>> Yes, I use the book as official coursebook in formal education in >>> Switzerland for the module "Object Oriented implementation of Multiuser >>> Applications". This in itself has nothing to do with Wonder but >>> everything with oo-concepts and I use Wonder/WebObjecs as a showcase for >>> clean oo design. >>> >>> >>>> On 5 Oct 2017, at 23:12, Theodore Petrosky <tedp...@yahoo.com >>>> <mailto:tedp...@yahoo.com> >>>> <mailto:tedp...@yahoo.com>> wrote: >>>> >>>> "Learning the Wonders" is the best book to start with. The author uses >>>> that book in classes he teaches (I believe in Germany). >>>> >>>> I would recommend that book to start with over the others that are >>>> available. >>>> >>>> All of the videos are available in the iTunes podcasts. I know the >>>> other links sometimes don’t work. >>>> >>>> Use the iTunes podcasts. go to podcasts, then select Store, then >>>> search for WebObjects. >>>> >>>> I know you mentioned that you viewed the two chapters of Leaning the >>>> Wonders. It really gets going after that. >>>> >>>> Ted >>>> >>>> >>>> >>>>> On Oct 5, 2017, at 3:31 PM, Chuck Hill <ch...@gevityinc.com >>>>> <mailto:ch...@gevityinc.com> >>>>> <mailto:ch...@gevityinc.com>> wrote: >>>>> >>>>> Here is a good place to start: >>>>> >>>>> https://www.amazon.com/Learning-Wonders-Markus-Ruggiero-ebook/dp/B00FCDHDAA >>>>> http://learningthewonders.com >>>>> >>>>> >>>>> Chuck >>>>> >>>>> On 2017-10-05, 12:25 PM, "Webobjects-dev on behalf of André Rothe" >>>>> <webobjects-dev-bounces+chill=gevityinc....@lists.apple.com on behalf >>>>> of andre.ro...@phosco.info> wrote: >>>>> >>>>> Am 2017-10-05 20:10, schrieb Theodore Petrosky: >>>>>> You are working too hard!!!!! >>>>> >>>>> :-) >>>>> >>>>>> you need to look at all the examples. what you are asking for is so >>>>>> simple (when you know how). >>>>> >>>>> LOL, exact. When you know how and where... The problem is, that a >>>>> lot of >>>>> WebObjects links on the internet are dead. >>>>> >>>>>> Have you used EOModeler to build your model? >>>>> >>>>> Yes, I have. >>>>> >>>>>> I recommend you look at these videos: >>>>> >>>>> 50% of these videos I have already watched (and downloaded). A lot >>>>> things you don't understand at the first time you will watch the >>>>> video, >>>>> because the WO community has its own "language", so it is hard to >>>>> follow >>>>> the concepts. >>>>> >>>>> Nevertheless, I have downloaded the examples for the WebObjects >>>>> Developer's Guide. This book is not bad, but it doesn't summarize the >>>>> workflows. So I have to read all the pages to find a hint for a >>>>> specific >>>>> problem. That is also a problem to find something, if you cannot name >>>>> the problem with the correct "WO Community term". >>>>> >>>>> My question refers to WOTable. In the meantime I have decompiled >>>>> WORepetition and find out, that you have to set components into the >>>>> WOTable tags, one component for every column of the database table, >>>>> which I need. The output of WOTable base on the "list" attribute, >>>>> which >>>>> needs an NSArray or List and the "item" attribute, which is of the >>>>> type >>>>> of the underlying database table. >>>>> >>>>> As I sent my question, I thought, that WOTable creates output for all >>>>> attributes of the "item" automatically, so I tried to reduce the >>>>> attributes of "item" before it will be visible to WOTable. But that >>>>> was >>>>> a fault. >>>>> >>>>> Sorry for my "simple" questions, but this is a learning process. And >>>>> there are almost 20 years between my knowlegde of WebObjects and the >>>>> knowledge of the other readers here. >>>>> >>>>> Best regards >>>>> Andre >>>>> _______________________________________________ >>>>> Do not post admin requests to the list. They will be ignored. >>>>> Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) >>>>> Help/Unsubscribe/Update your Subscription: >>>>> >>>>> https://lists.apple.com/mailman/options/webobjects-dev/chill%40gevityinc.com >>>>> >>>>> This email sent to ch...@gevityinc.com >>>>> >>>>> >>>> >>>> _______________________________________________ >>>> Do not post admin requests to the list. They will be ignored. >>>> Webobjects-dev mailing list (Webobjects-dev@lists.apple.com >>>> <mailto:Webobjects-dev@lists.apple.com> >>>> <mailto:Webobjects-dev@lists.apple.com>) >>>> Help/Unsubscribe/Update your Subscription: >>>> https://lists.apple.com/mailman/options/webobjects-dev/mailinglists%40kataputt.com >>>> >>>> This email sent to mailingli...@kataputt.com >>> >>> >>> >>> _______________________________________________ >>> Do not post admin requests to the list. They will be ignored. >>> Webobjects-dev mailing list (Webobjects-dev@lists.apple.com >>> <mailto:Webobjects-dev@lists.apple.com>) >>> Help/Unsubscribe/Update your Subscription: >>> https://lists.apple.com/mailman/options/webobjects-dev/andre.rothe%40zks.uni-leipzig.de >>> >>> This email sent to andre.ro...@zks.uni-leipzig.de >>> >> >> -- >> UNIVERSITÄT LEIPZIG >> Medizinische Fakultät >> Zentrum für Klinische Studien Leipzig – KKS >> André Rothe >> CIO >> Härtelstr. 16-18, 04107 Leipzig >> >> Tel: 0341/ 97 16118 >> Fax: 0341/ 97 16189 >> WWW: http://www.zks.uni-leipzig.de >> > -- UNIVERSITÄT LEIPZIG Medizinische Fakultät Zentrum für Klinische Studien Leipzig – KKS André Rothe CIO Härtelstr. 16-18, 04107 Leipzig Tel: 0341/ 97 16118 Fax: 0341/ 97 16189 WWW: http://www.zks.uni-leipzig.de _______________________________________________ Do not post admin requests to the list. They will be ignored. 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