How can I set the ID for an entity? for inserting I create a Key and an
entity:
Key collectionData = KeyFactory.createKey("FinalCount", "FinalCollection");
Entity countData = new Entity("Final", collectionData);
but for set the ID I don't know how, do you have examples?
Thank you.
El miércoles, 5 de febrero de 2014 19:01:49 UTC-6, Vinny P escribió:
>
> On Wed, Feb 5, 2014 at 10:35 AM, Juan de Dios Becerra
> <j.bece...@gmail.com<javascript:>
> > wrote:
>>
>> I have not found a good example of how to update datastore, so I am doing
>> manually delete the entities and then insert again I know is completely
>> awful for this reason I think it could be a better way, there exists? Btw I
>> am using Java.
>>
>
>
> Hi Juan,
>
> In the App Engine datastore, an update operation is the same as an insert
> operation; if you insert an entity with the same Kind and ID/Name as a
> currently existing entity, the pre-existing entity will be overwritten with
> information from the new entity. Also, the indexes will be automatically
> updated to reflect the new values.
>
> So you can simply reuse the code that is currently doing the entity
> insertion. Just remember to set the same Kind and ID/Name as the entity you
> want to overwrite. If you don't know the current IDs in use, you can query
> for the entities and extract the IDs.
>
>
> -----------------
> -Vinny P
> Technology & Media Advisor
> Chicago, IL
>
> App Engine Code Samples: http://www.learntogoogleit.com
>
>
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