Is there a way to access the appengine datastore via JDO/JPA from a java application from within a google compute engine instance. As far as I have seen, I can access manually as described in https://developers.google.com/datastore/docs/getstarted/start_java/
This works, yet this is very cumbersome - so I am looking for a simple way to use JDO/JPA/Objectivy/... to work on a higher level of abstraction. Any ideas/hints?
You could use the Remote API.
More info over here : https://developers.google.com/appengine/docs/java/tools/remoteapi
Related
My application is partly deployed on Appengine and partly on Compute Engine. I need to use Appengine's datastore from Compute Engine. I need ORM implementation for the same like JPA as using Remote API to access datastore will be quiet a task in my application. So kindly give any suggestions on the same.
Also does Datanucleus access platform provides anything for Compute engine to access Appengine's datastore remotely ?
There is a similar thread but its not resolved till yet.
Thanks in advance.
We got a couple millions data in the current GAE project using Google Cloud store. Mostly GPS point information. We want to be able to use all these GPS points in another demo instance, which is hosted in another GAE instance. Anyway we can do it?
Using Golang + Google App Engine
There is a Google Cloud Datastore API that you can use to access your Datastore data from any other deployment, including a different App Engine app. It's not available in Go, so you will have to mix in some Python or Java.
Is it possible for one GAE application to access the datastore of another GAE application (both applications are hosted under the same Google account) using Objectify? If so, how can I pass service account credentials to Objectify (which API calls)?
It is not possible. Objectify is a very simple and convenient lightweight ORM that sits on top of a GAE Datastore, thus shielding the developer from most of the complexities of using JDO/JPA.
Nowhere in the documentation have I seen the scenario you describe mentioned because that is not the problem it is trying to solve.
I suspect what you will probably need to do is create a Web Service that exposes your GAE application (whose data you want) through an API. Then have your other GAE application call those service methods to obtain the data it needs.
Alternatively, you can use something called remote_api. It allows you to access and manipulate a GAE Datastore remotely.
Below are some links I just found to similar questions after posting my answer:
Can I access Datastore entities of my other Google App Engine Applications
Can one application access other applications data querying the key in Google App Engine?
A solution is to have only one "GAE application" but to make different Modules in your application. The Datastore will be shared between the modules.
Another solution is to use the Remote API (https://developers.google.com/appengine/docs/java/tools/remoteapi), but you won't be able to use Objectify, I think...
What is better to code with php in google app engine or in amazon-ec2.
I think it is better in amazon-ec2 because they support datastore with php and google app engine doesn't, what do you think ?
While its not possible to access the appengine datastore, google has a new preview service for "cloud datastore", google "cloud datastore from php" and you will see how to use it.
You really cant compare AWS with appengine as one requires managing servers and scalability manually and their noSQL solution (dynamoDB) is a joke compared to google's datastore, for example in dynamoDB you must provision your writes beforehand and even if you are all day changing provisioning, it takes sometimes hours to propagate the new setting.
I had never use Google App Engine, but several times AWS systems, and sure, as AWS EC2 could be used as Linux Server Instance, I recommend you that provider. And coz' it seems that you use PHP, they have strong API for this langage. Have fun with AWS.
I was having a look at the new Google Cloud Datastore and looks great. But there is something I could not understand... is it supposed to substitute Google App Engine Datastore? How can I use it inside GAE? What are the differences between both of them?
I have a GAE app in Java that uses 3 entities with thousands of rows each one, and I need to do joins quite often...
The cloud datastore is the App Engine datastore, for use outside App Engine. You won't get any benefit trying to use it with your App Engine app, unless you need other external apps to also have access to the data.
You certainly won't get more efficient joins. If you really need that, perhaps you should look into Cloud SQL, which is basically a version of MySQL you can use from App Engine.
They both are the same, in fact Google App Engine can use Google Cloud DataStore as one of its way to store data, the other options include Google Cloud SQL, Google Cloud Storage. You may select among these three according to the type of data you want to store and the way you want to access them.
From your question its clear that Google Cloud SQL would be right choice as no other options provide joins for retrieving results.
Cloud SQL is nothing but MySQL(the popular open source database) running on google platform. So you can perform your regular SQL-like queries to get your results.