I have a simple app that relates hrefs to keywords in a many to many relationship. The idea is to be able to save hrefs with a list of keywords and then, later on, search the library for hrefs that match a list of keywords. There are 3 tables, one table that has id as a long, href as a varchar. Another table has id as a long and keyword as a varchar. The thrid table is the links table establishing the many to many relationship. The code that I have all seems to work OK. I use a Cloudscape db. I've attached a zip file that contains source and deployment files. I've tested this in Win2000 using RC2 version of JBoss. Enjoy.
Brandon Knitter wrote: > I just noticed that you are working on an example for all of us! :) Do you have > this ready, perhaps with the changes below? I got the zip from your site below > about an hour ago, and I'm happy to see an example! :) > > Thanks, > > -- > -bk > > Quoting David Jones <[EMAIL PROTECTED]>: > > > Greg Turner <[EMAIL PROTECTED]> writes: > > > > > I've gotten many to many relationships to work, so I took a look at > > > what you are doing. While I did not take an indepth look at your code, > > > I did notice one big difference between our two approaches. Your code > > > is trying to do too much, in managing relationship IDs. If you were to > > > change your code to my way of doing it, here is what it would look > > > like: > > > > > > Company company = companyHome.create (companyId, name); > > > > > > Employee employee = employeeHome.create (emailId,email); > > > > > > company.getEmployees().add (employee); > > > > Thank you for the idea. I modified my EmployeeBean>>setCompanyId(companyId) > > to > > follow your suggestion, so rather than a direct: > > > > employee.setCompany(companyLocal); > > > > I'm instead doing the more roundabout: > > > > companyLocal.getEmployees().add(employeeLocal); > > > > And it works, when called from either ejbPostCreate() or after > > create() has returned to the client. > > > > Thanks a lot. > > > > > > My original setCompany(companyLocal) still looks like it should work and is > > more direct. But I'll take anything that works for the moment :-) > > > > > Another big difference is that I do all the work in a SessionBean, > > > which means that it all occurs under the scope of one transaction. > > > Whereas, your code does things piece wise in the client, which means > > > not under the scope of one transaction. If you were to do it as I > > > suggest on the client, it may still not work because of the > > > differences in transaction scope. > > > > The application that I am trying to convert to JBoss does access all > > Entities through Session beans. I was just hoping that for a minimal > > example the 2 entity beans and client class might be clearer, and it > > also matched Tim's original Version2 code example a little closer. > > > > I had assumed that the greater number of transactions involved by > > making multiple calls from the client would only affect the > > performance rather than the correctness. Everything seems to work ok > > from the client. > > > > > Hope this has given you some ideas. Please report back any successes. > > > > > > Greg Turner > > > > Thanks for the help. I'm hoping that the apparent underlying problems with > > setCompany() can be fixed up relatively soon, but at least I can > > continue using the add() technique for the moment. > > > > > > > David Jones wrote: > > > > I am new to both JBoss and EJB2.0 and the new CMP support. Using > > > >XDoclet I can create a couple of beans that include simple CMP and > > > >CMR fields, generate and deploy an ear to JBoss, and it appears to > > > >install it with no WARNings. > > > > > > > > But using a simple client I find that the value of my CMR/foreign > > > >key field never changes from null. This is irrespective of whether I > > > >set it in the ejbPostCreate or call it after create() returns to my > > > >client. > > > > > > > > [...] > > > > > > > > I have made the example available on my website: 47kb This includes > > > >the source, build.xml and a built ear ready to deploy. > > > > > > > > http://www.night.dircon.co.uk/jboss/cmr-example.zip > > -- > > David G Jones [EMAIL PROTECTED] > > PGP Key ID=0x389707D3 http://www.night.dircon.co.uk/pgp.asc > > > > _______________________________________________________________ > > > > Don't miss the 2002 Sprint PCS Application Developer's Conference > > August 25-28 in Las Vegas -- http://devcon.sprintpcs.com/adp/index.cfm > > > > _______________________________________________ > > JBoss-user mailing list > > [EMAIL PROTECTED] > > https://lists.sourceforge.net/lists/listinfo/jboss-user > > > > > > _______________________________________________________________ > > Don't miss the 2002 Sprint PCS Application Developer's Conference > August 25-28 in Las Vegas - >http://devcon.sprintpcs.com/adp/index.cfm?source=osdntextlink > > _______________________________________________ > JBoss-user mailing list > [EMAIL PROTECTED] > https://lists.sourceforge.net/lists/listinfo/jboss-user -- Greg Turner Tiburon Enterprise Systems http://www.tiburon-e-systems.com Box 1171 Tiburon, CA 94920 415-332-3363
HrefLib.zip
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