Yes, but I don't see where to associate the ID, when I create my entities I
use only one key for all the entities, see this snippet:
Key activityData = KeyFactory.createKey("Activity", "ActivityData");
for(int a = 0 a < activities.size(); a++){
Entity activityDesglose = new Entity("Activities", activityData);
activityDesglose.setProperty("publishDate", date);
activityDesglose.setProperty("title", activities.get(i).getTitle());
activityDesglose.setProperty("type", activities.get(i).getVerb());
}
I don't know if I explain my point correctly, where or how con I use the ID
to get the correct entity.
El jueves, 6 de febrero de 2014 17:43:51 UTC-6, PK escribió:
>
> There is a get() method where you pass the key and get the entity back.
> This is described in the docs here:
>
> https://developers.google.com/appengine/docs/java/datastore/entities
>
> Retrieving an entity
>
> To retrieve an entity identified by a given key, pass the
> Key<https://developers.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/Key>
> object
> to the
> DatastoreService.get()<https://developers.google.com/appengine/docs/java/javadoc/com/google/appengine/api/datastore/DatastoreService#get(com.google.appengine.api.datastore.Key)>
> method:
>
> // Key employeeKey = ...;
> Entity employee = datastore.get(employeeKey);
>
>
> PK
> http://www.gae123.com
>
> On February 6, 2014 at 3:06:22 PM, Juan de Dios Becerra (
> [email protected] <javascript:>) wrote:
>
> 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 <
>> [email protected]> 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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