If u want to perform one more different entity save,update,delete operation in a single transaction then you need to set a parent key to create same entity group. In java you can use KeyFactory
Example: tx.begin(); // Here root is a saved entity. You have to load that entity when you want to create key Key entityAKey= KeyFactory.*createKey*(root.getKey(), EntityA.*class*.getSimpleName(), "EntityA"+UUID.*randomUUID*().toString()); Key entityBKey= KeyFactory.*createKey*(root.getKey(), EntityB.*class*.getSimpleName(), "EntityB"+UUID.*randomUUID*().toString()); EntityA a = *new* EntityA(); a.setKey(entityAKey); EntityB b = new EntityB(); b.setKey(entityBKey); pm.makePersistent(a); pm.makePersistent(b); tx.commit(); On Tue, Jun 22, 2010 at 8:06 PM, Simon <qila...@gmail.com> wrote: > I suggest you read the documentation for storing data, in both the > Python and Java sections. > > For example, the Python sections gives a good overview of Entity > Groups here - > http://code.google.com/appengine/docs/python/datastore/keysandentitygroups.html > > On Jun 22, 9:49 am, MANISH DHIMAN <manisd...@gmail.com> wrote: > > Hi All > > Please provide me some detail information about entity group. > > -- > 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<google-appengine-java%2bunsubscr...@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.
