Oh boy, now I've got information overload! Fortunately there's a link in Chuck Cavaness's book to an article reviewing & comparing some of them - although strangely they include Forte for Java from Sun instead of JDO. Well, I can see what I'm going to be doing this weekend.
Regards Adam Steve Muench wrote: >Oracle's J2EE Framework "Business Components for Java" >makes it very easy to read and write from collections >of values objects (sourced from the database) with >automatic interaction with business objects that >centralize your business rules, and handles the OR mapping >for your business objects. You pick the "shape" of >the data you need in your view layer, and it implements >all of the handlers for your value object collections >and optionally makes the value objects in these >collections transparently updateable, delegating >changes back through your business object layer >with no yucky code you have to write yourself. > >A whitepaper on all the capabilities is at: > >http://otn.oracle.com/products/jdev/htdocs/j2ee_bc4j.html > >If you've read the O'Reilly Struts book sample chapters >on TheServerSide.com, basically all of the Model Layer things >that Chuck describes in Chapter 6, "Struts Model Components" >as necessary pieces for your working Struts-with-Database- >and-Business-Logic application, the BC4J framework >implements for you. You basically just tell it the >tables you want to work with (for your BO layer), or >forward generate those tables from a BO object model >that you design, and then tell it what queries your >view layer needs to perform. > >You don't need to write model layer plumbing code. > > -> Don't bother writing Value Object classes > > -> Don't bother writing JDBC code for queries > > -> Don't bother writing a class to expose your > collections of value objects to the view layer > >All of these things are done for you. > >Plus, it works with any SQL database, not only Oracle. :-) > >I'm planning a whitepaper that specifically illustrates >how to couple Struts with BC4J next. > >__________________________________________________________________ >Steve Muench - Developer, Product Mgr, Java/XML Evangelist, Author >Simplify J2EE and EJB Development with BC4J >http://otn.oracle.com/products/jdev/htdocs/j2ee_bc4j.html >Building Oracle XML Apps, www.oreilly.com/catalog/orxmlapp >----- Original Message ----- >From: <[EMAIL PROTECTED]> >To: "Struts Users Mailing List" <[EMAIL PROTECTED]> >Sent: Wednesday, May 29, 2002 6:44 PM >Subject: Re: Design Advice - Relational Databases & Java Objects > > >| >| >| >| Adam - >| >| Have you looked at Torque from the Jakarta Tubine project? >| >| I haven't used it but have heard good things about it. It provides an >| ability to perform O/R mapping using an XML configuration file - and (as I >| understand) it creates Java files for you that implement a peristence >| layer. >| >| FWIW - >| Kevin >| >| >| >| >| Adam Hardy <[EMAIL PROTECTED]> on 05/29/2002 12:44:28 PM >| >| Please respond to "Struts Users Mailing List" >| <[EMAIL PROTECTED]> >| >| To: Struts Users Mailing List <[EMAIL PROTECTED]> >| cc: (bcc: Kevin Bedell/Systems/USHO/SunLife) >| Subject: Design Advice - Relational Databases & Java Objects >| >| >| Hi All, >| >| I saw this thread in the archives and I thought I'd pinch the title. >| I've spent this afternoon surfing the web looking at stuff on Sun, >| Jakarta and lots of smaller sites looking for a ready-made data access >| layer package but I take it there isn't an open-source one out there. >| >| Obviously I don't want to tie my data access layer to struts, so there >| are a few questions I've got. >| >| (1) Is it best for the data access layer to throw exceptions on error to >| be picked up by the business objects & then struts actions, or would it >| be good to use a struts-type message object and use strings in the >| application resources file (I'm just worried my exceptions' text would >| not be multi-lingual) >| >| (2) How would I get the database connection info to the data access >| layer? Presuming I want to set it up in struts-config.xml or as in >| commons-dbcp, would I then pass it in from struts actions into the >| business object and then into the data access layer as a parameter on >| each call? >| >| >| >| I've seen quite a few patterns like www.martinfowler.com and code like >| in Sun's Pet Store, so I think I've got a fairly good idea of what I >| need. The data access layer I want has got to: >| >| - take as input and return as output Data Transport Objects >| - allow the business objects to control transactions >| - use a connection pool >| - possibly keep the SQL statements in an external XML file >| - have comprehensive error handling & reporting >| >| >| >| >| -- >| To unsubscribe, e-mail: < >| mailto:[EMAIL PROTECTED]> >| For additional commands, e-mail: < >| mailto:[EMAIL PROTECTED]> >| >| >| >| >| >| >| >| --------------------------------------------------------------------------- >| This e-mail message (including attachments, if any) is intended for the use >| of the individual or entity to which it is addressed and may contain >| information that is privileged, proprietary , confidential and exempt from >| disclosure. If you are not the intended recipient, you are notified that >| any dissemination, distribution or copying of this communication is >| strictly prohibited. If you have received this communication in error, >| please notify the sender and erase this e-mail message immediately. >| --------------------------------------------------------------------------- >| >| >| -- >| To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> >| For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> >| >| > > >-- >To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> >For additional commands, e-mail: <mailto:[EMAIL PROTECTED]> > > > > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
