Re: Object Relational Bridge is great ? A Basic Problem

[Adolfo Miguelez <pe...@hotmail.com>]

Hi,

as a newbie in O/R mapping tools, APIs and frameworks I find the following 
issue. All of the frameworks that I have browsed lacks from a basic problem: 
The classes that maps the corresponding tables in the database must be 
manually generated, either by hand (e.g. OJB) or by building the code (e.g. 
Jakarta Torque).

This becomes a pain since it difficults to make an application that could 
"learn" for itself a data model and create its own classes. No way, AFAIK, 
for implementing general mechanism.

I know about BCEL project, which is able to compile classes in runtime, and 
it could be really helpful to integrate with the previous ones and get 
automathic mechanims, but I do not any framework that take advantage of 
BCEL.

The only way that I have seen to do something similar, is the mini-project 
SIMPER (Struts resources page), which is able to work out dynabeans 
(actually they are hashmaps in their guts), following a database schema, for 
it self. For me it has the problem that uses Servlets 2.3 filters and I am 
working with Servlets 2.2 specs.

I just want to request your opinion or knowledge about a framework that can 
implement itself such a classes, or a framework which classes are not 
actually classes but hashmaps or something like that.... or even some one 
taking advantage of BCEL or analogous mechanism. I know is a difficult 
question, supposing that I am not mixing any concept up.

:-)

Thanks in advance,

Adolfo

>From: Adam Hardy <ah...@cyberspaceroad.com>
>Reply-To: "Struts Users Mailing List" <st...@jakarta.apache.org>
>To: Struts Users Mailing List <st...@jakarta.apache.org>
>Subject: Re: Object Relational Bridge is great !
>Date: Fri, 05 Jul 2002 18:15:45 +0200
>
>Hi Fabrice,
>did you check out JDO? If so, why didn't you prefer it?
>
>
>
>fabrice dewasmes wrote:
>>Hi,
>>
>>no problem this time but i'd like to applause chuck Cavaness with both 
>>hands
>>for the public review of his struts book. Chuck, you're clairvoyant : 
>>using
>>Object relational bridge is a great idea. we've hesitated between torque,
>>castor, and OJB and it appears that OJB has a really powerful API and 
>>allows
>>all kind of relational mappings (1:1, 1:n, m:n, inheritance, polymorphism,
>>...) it saves a lot of time and i think this is many more powerful than
>>EJBs.
>>
>>I definitely recommend this persistence framework to any people beginning 
>>a
>>struts project (or even non struts project)
>>
>>Fabrice
>>
>
>
>
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Re: Object Relational Bridge is great ? A Basic Problem

[Bryan Field-Elliot <br...@netmeme.org>]

On Fri, 2002-07-05 at 15:50, Adolfo Miguelez wrote:


    The only way that I have seen to do something similar, is the mini-project 
    SIMPER (Struts resources page), which is able to work out dynabeans 
    (actually they are hashmaps in their guts), following a database schema, for 
    it self. For me it has the problem that uses Servlets 2.3 filters and I am 
    working with Servlets 2.2 specs.
    

Adolfo,

It's on the to-do list for Simper to reduce the dependency on Servlet
2.3 Filters for transaction demarcation - instead, to use them as an
option, rather than a requirement. But before I can make those changes,
first, I need to learn how to get by on 3 hours sleep a night with
energy and enthusiasm to spare for projects like Simper. ;)

Bryan