Re: [appengine-java] Re: Subject: Java documentation updated to use low-level API for example code
hmmm thnx. it certainly did the trick.but I couldn't find the maximum length of a key? any ideas ? On Fri, Jan 14, 2011 at 6:42 PM, Didier Durand durand.did...@gmail.com wrote: Hi, You may be interested to read to undertstand the structure of DS keys: http://code.google.com/appengine/articles/storage_breakdown.html#anc-entitiestable And, to answer your question, you can use key.getId() (see http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/Key.html) on low-level api to retrieve the Long that you need for JPA regards didier On Jan 14, 1:59 pm, Charms Styler charmssty...@gmail.com wrote: Thanks. So it is possible to use both JPA low level API. I tried it out , works like a charm but @ retrieval of specific object I ran into prob you see in my JPA, all my Entities are by long ID. How is possible for me to access id using Key ? How may I refer keys using id vice versa?? @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; -- 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-java@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-java@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.
[appengine-java] Re: Subject: Java documentation updated to use low-level API for example code
Hi, I don't know the exact answer to your question but what I can say is that it is clearly dependent on your entity group hierarchy. The key contains a concatenation of the key of all the ancestors. I never saw any limitation on the depth of this ancestor hierarchy. So, if you can be as deep as you want on ancestors, that means that the length of key is not limited. But, I guess we need confirmation from googlers on this one regards didier On Jan 17, 7:23 am, Charms Styler charmssty...@gmail.com wrote: hmmm thnx. it certainly did the trick.but I couldn't find the maximum length of a key? any ideas ? On Fri, Jan 14, 2011 at 6:42 PM, Didier Durand durand.did...@gmail.com wrote: Hi, You may be interested to read to undertstand the structure of DS keys: http://code.google.com/appengine/articles/storage_breakdown.html#anc-... And, to answer your question, you can use key.getId() (see http://code.google.com/appengine/docs/java/javadoc/com/google/appengi...) on low-level api to retrieve the Long that you need for JPA regards didier On Jan 14, 1:59 pm, Charms Styler charmssty...@gmail.com wrote: Thanks. So it is possible to use both JPA low level API. I tried it out , works like a charm but @ retrieval of specific object I ran into prob you see in my JPA, all my Entities are by long ID. How is possible for me to access id using Key ? How may I refer keys using id vice versa?? @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; -- 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-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group athttp://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-java@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] Re: Subject: Java documentation updated to use low-level API for example code
Thanks. So it is possible to use both JPA low level API. I tried it out , works like a charm but @ retrieval of specific object I ran into prob you see in my JPA, all my Entities are by long ID. How is possible for me to access id using Key ? How may I refer keys using id vice versa?? @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; -- 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-java@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.
[appengine-java] Re: Subject: Java documentation updated to use low-level API for example code
Hi, You may be interested to read to undertstand the structure of DS keys: http://code.google.com/appengine/articles/storage_breakdown.html#anc-entitiestable And, to answer your question, you can use key.getId() (see http://code.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/Key.html) on low-level api to retrieve the Long that you need for JPA regards didier On Jan 14, 1:59 pm, Charms Styler charmssty...@gmail.com wrote: Thanks. So it is possible to use both JPA low level API. I tried it out , works like a charm but @ retrieval of specific object I ran into prob you see in my JPA, all my Entities are by long ID. How is possible for me to access id using Key ? How may I refer keys using id vice versa?? @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; -- 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-java@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.
[appengine-java] Re: Subject: Java documentation updated to use low-level API for example code
Thanks for updated Docs. AsyncDatastoreService is really nice thing to have. One question: how many concurent async operations are possible? Is there any limit? -- 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-java@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] Re: Subject: Java documentation updated to use low-level API for example code
I believe the limit is 10 concurrent Async Datastore operations. As far as transactions involving multiple entities, you could always do this - they just have to be in the same entity group. -- Ikai Lan Developer Programs Engineer, Google App Engine Blogger: http://googleappengine.blogspot.com Reddit: http://www.reddit.com/r/appengine Twitter: http://twitter.com/app_engine On Thu, Jan 13, 2011 at 4:37 AM, Alexander Maslov alexmas...@gmail.comwrote: Thanks for updated Docs. AsyncDatastoreService is really nice thing to have. One question: how many concurent async operations are possible? Is there any limit? -- 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-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.comgoogle-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-java@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] Re: Subject: Java documentation updated to use low-level API for example code
A lot of people were talking about moving data from Master/Slave to HR taking to much time. I was thinking about usage of Async datastore calls to make things several times faster. -- 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-java@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.
[appengine-java] Re: Subject: Java documentation updated to use low-level API for example code
Hi Ikai, As for what I have come across so far, Low level Api is useful for performing a transaction over multiple entities. However is it possible to use low level API as well as JPA or JDO ? The idea is to use low level api whenever a need arises to perform a transaction over multiple entities, but I am not sure making entity groups using JPA Is doable? What's your say on this? -- 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-java@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.
