Thank you. I'm trying an application using JPA with App engine. If I want to store say 10,000 entities into the datastore, I am not able to store more than 100-200 entities due to 30 seconds timeout problem.
Will using Task Queue help resolve this problem or is there any other way to store large number of entities into the datastore ? On Tue, Jun 1, 2010 at 4:18 PM, Ikai L (Google) <[email protected]> wrote: > You don't have to call makePersistent on an object current managed by a > PersistenceManager. Any updates to fields on this object should cause it to > be marked dirty, and when you close the PersistenceManager, the changes > should be reflected in the datastore. > > As an additional note, you might want to look at Java coding conventions: > > http://java.sun.com/docs/codeconv/html/CodeConvTOC.doc.html > > <http://java.sun.com/docs/codeconv/html/CodeConvTOC.doc.html>The way > you've written your code makes it harder for folks who read Java to try to > understand what you're doing (likely the reason why no one responded > initially). > > > On Wed, May 26, 2010 at 7:40 AM, fni <[email protected]> wrote: > >> I use the following code to update an object from servlet in Google >> App Engine : >> >> String Time_Stamp="[ 2010-05-26 ]",query="select from >> "+Contact_Info_Entry.class.getName()+" where Contact_Id == >> '"+Contact_Id+"' order by Contact_Id desc"; >> >> PersistenceManager pm=null; >> try >> { >> pm=PMF.get().getPersistenceManager(); >> >> // note that this returns a list, there could be multiple, >> DataStore does not ensure uniqueness for non-primary key fields >> List<Contact_Info_Entry> >> results=(List<Contact_Info_Entry>)pm.newQuery(query).execute(); >> Contact_Info_Entry A_Contact_Entry=results.get(0); >> A_Contact_Entry.Extra_10=Time_Stamp; >> pm.makePersistent(A_Contact_Entry); >> } >> catch (Exception e) >> { Send_Email(Email_From,Email_To,"Check_License_Servlet Error >> [ "+Time_Stamp+" ]",new Text(e.toString() >> +"\n"+Get_Stack_Trace(e)),null); } >> finally { pm.close(); } >> >> The value "[ 2010-05-26 ]" was in A_Contact_Entry.Extra_10, but it >> seems "pm.makePersistent(A_Contact_Entry);" was not executed. >> The object was not updated and there was no error message, why ? How >> to fix it ? >> >> -- >> 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 >> [email protected]. >> To unsubscribe from this group, send email to >> [email protected]<google-appengine-java%[email protected]> >> . >> For more options, visit this group at >> http://groups.google.com/group/google-appengine-java?hl=en. >> >> > > > -- > Ikai Lan > Developer Programs Engineer, Google App Engine > Blog: http://googleappengine.blogspot.com > Twitter: http://twitter.com/app_engine > Reddit: http://www.reddit.com/r/appengine > > -- > 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 > [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine-java%[email protected]> > . > 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 [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
