How to browse local Java App Engine datastore?

It seems there is no equivalent of Python App Engine's _ah/admin for the Java implementation of Google App Engine.

Is there a manual way I can browse the datastore? Where are the files to be found on my machine? (I am using the App Engine plugin with Eclipse on OS X).

Solution 1:

http://googleappengine.blogspot.com/2009/07/google-app-engine-for-java-sdk-122.html: "At long last, the dev appserver has a data viewer. Start your app locally and point your browser to http://localhost:8888/_ah/admin http://localhost:8000/datastore* to check it out."

* as of 1.7.7

Solution 2:

There's currently no datastore viewer for the Java SDK - one should be coming in the next SDK release. In the meantime, your best bet is to write your own admin interface with datastore viewing code - or wait for the next SDK release.

Java App Engine now has a local datastore viewer, accessible at http://localhost:8080/_ah/admin.

Solution 3:

I have local datastore on my Windows+Eclipse environment on \war\WEB-INF\appengine-generated\local_db.bin

As far as I understood it uses internal format named "protocol buffers". I don't have external tools to present the file in human-readable format.

I'm using simple "viewer" code like this:

public void doGet(HttpServletRequest req, HttpServletResponse resp) 
    throws IOException 
{

    resp.setContentType("text/plain");

    final DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
    final Query query = new Query("Table/Entity Name");
    //query.addSort(Entity.KEY_RESERVED_PROPERTY, Query.SortDirection.DESCENDING);

    for (final Entity entity : datastore.prepare(query).asIterable()) {
        resp.getWriter().println(entity.getKey().toString());

        final Map<String, Object> properties = entity.getProperties();
        final String[] propertyNames = properties.keySet().toArray(
            new String[properties.size()]);
        for(final String propertyName : propertyNames) {
            resp.getWriter().println("-> " + propertyName + ": " + entity.getProperty(propertyName));
        }
    }
}

Solution 4:

In the newest versions of the SDK (1.7.6+) the admin part of the dev server comes with it changed its location

Analyzing the server output logs we can see that it is accessible at:

http://localhost:8000

And the Datastore viewer:

http://localhost:8000/datastore

Looks pretty neat - according to google's new design guidlines.