[appengine-java] Relational Table using JDO
Hi all, I have a simple doubt that I would like to see explained. I know a bit of relational databases but I don't understand how I can do the same using JDO. As for example, I have a table users-plans which combines the table user to the table plans. In table plans I have all the plans and I just match it to the user in a "middle table". Could someone explain how this would work in GAE? Thanks and Merry Christmas! -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Relational Table using JDO
You can do some sort of relational mappings between entities but not to the full extend like RDBMS. Have you worked through the examples in http://code.google.com/appengine/docs/java/datastore/ yet? On Fri, Dec 25, 2009 at 9:36 PM, TiagoP wrote: > Hi all, > > I have a simple doubt that I would like to see explained. > > I know a bit of relational databases but I don't understand how I can > do the same using JDO. > > As for example, I have a table users-plans which combines the table > user to the table plans. In table plans I have all the plans and I > just match it to the user in a "middle table". > > Could someone explain how this would work in GAE? > > Thanks and Merry Christmas! > > > > -- > > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > google-appengine-j...@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine-java+unsubscr...@googlegroups.com > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > > > -- Regards, Michael Hoi Sang Chan MSc Advanced Software Engineering Department of Computer Science King's College London Strand, LONDON WC2R 2LS Tel: +447881900965 -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
Re: [appengine-java] Relational Table using JDO
We have build a software product to provide such functionality. You can check it out at http://www.cloud2db.com. On Fri, Dec 25, 2009 at 9:36 PM, Michael Chan wrote: > You can do some sort of relational mappings between entities but not to the > full extend like RDBMS. > > Have you worked through the examples in > http://code.google.com/appengine/docs/java/datastore/ yet? > > > > On Fri, Dec 25, 2009 at 9:36 PM, TiagoP wrote: > >> Hi all, >> >> I have a simple doubt that I would like to see explained. >> >> I know a bit of relational databases but I don't understand how I can >> do the same using JDO. >> >> As for example, I have a table users-plans which combines the table >> user to the table plans. In table plans I have all the plans and I >> just match it to the user in a "middle table". >> >> Could someone explain how this would work in GAE? >> >> Thanks and Merry Christmas! >> >> >> >> -- >> >> You received this message because you are subscribed to the Google Groups >> "Google App Engine for Java" group. >> To post to this group, send email to >> google-appengine-j...@googlegroups.com. >> To unsubscribe from this group, send email to >> google-appengine-java+unsubscr...@googlegroups.com >> . >> For more options, visit this group at >> http://groups.google.com/group/google-appengine-java?hl=en. >> >> >> > > > -- > Regards, > > Michael Hoi Sang Chan > > MSc Advanced Software Engineering > Department of Computer Science > King's College London > Strand, LONDON > WC2R 2LS > > Tel: +447881900965 > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > google-appengine-j...@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine-java+unsubscr...@googlegroups.com > . > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
