Ikai-
Thank you for the great hint, it is good to know the right track.
Still hoping for another hint. I looked at the Python code (below),
and would like to somehow port it to Java, but have no idea where to
begin.
Really, I only need to read the Simple DB data in my Google App Engine
App.
Conceptually, I just need a little help. Would the following code be
the way you would return simpleDB data in XML form (as the "message"
below)--can you wrap all the query in the URL like this?
Also, is this limited to 1 MB responses? I am unclear on the Google
Documentation--sometimes it refers to a 1MB response limit, and
sometimes a 10MB response limit.
URL url = new URL("https://sdb.amazonaws.com/
?Action=GetAttributes
&AWSAccessKeyId=[valid access key id]
&DomainName=MyDomain
&ItemName=JumboFez
&SignatureVersion=2
&SignatureMethod=HmacSHA256
&Timestamp=2010-01-25T15%3A03%3A07-07%3A00
&Version=2009-04-15
&Signature=[valid signature]");
HttpURLConnection connection = (HttpURLConnection)
url.openConnection();
connection.setDoOutput(true);
connection.setRequestMethod("POST");
OutputStreamWriter writer = new
OutputStreamWriter(connection.getOutputStream());
writer.write("message=" + message);
writer.close();
if (connection.getResponseCode() ==
HttpURLConnection.HTTP_OK) {
// OK
} else {
// Server returned HTTP error code.
}
PYTHON code below:
import cgi
import logging
from google.appengine.api import users
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
from google.appengine.ext import db
from google.appengine.api import datastore_types
from google.appengine.api import memcache
import os
from google.appengine.ext.webapp import template
class MainPage(webapp.RequestHandler):
def get(self):
items_query = Item.all().order('-date')
items = items_query.fetch(10)
template_values = {
'items': items,
}
path = os.path.join(os.path.dirname(__file__), 'index.html')
self.response.out.write(template.render(path, template_values))
class Edit(webapp.RequestHandler):
def get(self):
key = str(self.request.get('key'))
item = db.get(key)
template_values = {
'item': item
}
path = os.path.join(os.path.dirname(__file__), 'edit.html')
self.response.out.write(template.render(path, template_values))
class Put(webapp.RequestHandler):
def handle(self):
self.response.headers['Content-Type'] = 'text/plain'
ui = str(self.request.get('ui'))
key = str(self.request.get('key'))
content = self.request.get('content')
if not content or len(content) == 0:
if ui:
self.redirect('/')
else:
self.response.out.write(key)
return
item = Item()
try:
item = db.get(key)
except datastore_types.datastore_errors.BadKeyError:
logging.debug("Could not find key %s" % key)
item.content = self.request.get('content')
item.put()
key = str(item.key())
memcache.set(key, item)
if ui:
self.redirect('edit?key=%s' % key)
else:
self.response.out.write(key)
def get(self):
self.handle()
def post(self):
self.handle()
class Get(webapp.RequestHandler):
def get(self):
self.response.headers['Content-Type'] = 'text/plain'
key = str(self.request.get('key'))
item = memcache.get(key)
if item is None:
try:
item = db.get(key)
memcache.set(key, item)
except:
logging.error("Could not find key %s" % key)
if item is not None:
self.response.out.write(item.content)
else:
self.response.out.write("")
class Item(db.Expando):
content = db.StringProperty(multiline=True)
date = db.DateTimeProperty(auto_now_add=True)
application = webapp.WSGIApplication(
[('/', MainPage),
('/edit', Edit),
('/get', Get),
('/put', Put)],
debug=True)
def main():
run_wsgi_app(application)
if __name__ == "__main__":
main()
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On Apr 10, 8:06 am, "Ikai L (Google)" <[email protected]> wrote:
> The reason this code isn't working is because it's build on top of Apache
> Commons HttpClient. You'll need to use URL and URLConnection to make your
> REST calls instead.
>
> This is definitely possible, as people have created a Python library for
> doing this:
>
> http://code.google.com/p/appengine-simpledb/source/browse/#svn/trunk
>
> You're using Java. I haven't seen anything in my searches for examples
> making SimpleDB calls in Java (probably because developers just use App
> Engine's datastore for persistence). You'll likely have to roll your own
> client against the REST spec:
>
> http://docs.amazonwebservices.com/AmazonSimpleDB/latest/DeveloperGuid...
>
>
>
>
>
> On Fri, Apr 9, 2010 at 2:41 PM, deuce4 <[email protected]> wrote:
> > I tried with this
> > //below gives error: java.lang.NoClassDefFoundError: org/apache/
> > commons/httpclient/HttpMethod
>
> > // AmazonSimpleDB sdb = new AmazonSimpleDBClient(new
> > PropertiesCredentials(
> > //
> > ClockServlet.class.getResourceAsStream("AwsCredentials.properties")));
> > //
> > //
> > System.out.println("===========================================");
> > // System.out.println("Getting Started with Amazon SimpleDB");
> > //
> > System.out.println("===========================================\n");
> > //
> > //
> > // // Create a domain
> > // String myDomain = "MyStore";
> > // System.out.println("Creating domain called " + myDomain
> > + ".\n");
> > // sdb.createDomain(new CreateDomainRequest(myDomain));
> > //
> > // // List domains
> > // System.out.println("Listing all domains in your account:
> > \n");
> > // for (String domainName :
> > sdb.listDomains().getDomainNames()) {
> > // System.out.println(" " + domainName);
> > // }
> > // System.out.println();
>
> > I don't have the URL fetch code attempt anymore--mostly I have the
> > fundamental question of how to create a custom connection object like
> > the sdb above into a Google App Engine URL Fetch connection object.
>
> > I'm a novice with Google App Engine
>
> > Any specific help would be super appreciated in connecting a Amazon
> > SImpleDB to a Java Servlet in Google App Engine.
>
> > thanks
>
> > On Apr 10, 7:10 am, deuce4 <[email protected]> wrote:
> > > On Apr 9, 3:23 pm, deuce4 <[email protected]> wrote:
>
> > > > Is there any elegant way to access data stored in Amazon's Simple DB
> > > > from a Google
> > application?
>
> > > > I tried using URLfetch, but failed. Any ideas?
>
> > > I suppose I am new at this, and wasn't able to get the libraries
> > > working. Any chance of seeing an outline of the process from someone
> > > who is knowledgable in accessing outside data?
>
> > --
> > You received this message because you are subscribed to the Google Groups
> > "Google App Engine" group.
> > To post to this group, send email to [email protected].
> > To unsubscribe from this group, send email to
> > [email protected]<google-appengine%2Bunsubscrib
> > [email protected]>
> > .
> > For more options, visit this group at
> >http://groups.google.com/group/google-appengine?hl=en.
>
> --
> Ikai Lan
> Developer Programs Engineer, Google App
> Enginehttp://googleappengine.blogspot.com|http://twitter.com/app_engine
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