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• Pagination in Google App Engine with Java

  - by newbie

  I need to create simple pagination of objects, but when I read manual I found out that query.setRange(5, 10); will fetch 10 objects, even when only 5 objects are needed. Is there anyway to fetch just needed objects? EDIT: I started bounty, so fi you can show me simple example code in Java that works, then I will accept you answer.

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• Good javascript template engine to work with json...

  - by Pandiya Chendur

  I have looked at jTemplates and it's worth a try. Are there any other template engines other than jTemplates?

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• StringListProperty limited to 500 char strings (Google App Engine / Python)

  - by MarcoB

  It seems that StringListProperty can only contain strings up to 500 chars each, just like StringProperty... Is there a way to store longer strings than that? I don't need them to be indexed or anything. What I would need would be something like a "TextListProperty", where each string in the list can be any length and not limited to 500 chars. Can I create a property like that? Or can you experts suggest a different approach? Perhaps I should use a plain list and pickle/unpickle it in a Blob field, or something like that? I'm a bit new to Python and GAE and I would greatly appreciate some pointers instead of spending days on trial and error...thanks!

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• Google App Engine - Dealing with concurrency issues in storing an object

  - by Spines

  My User object that I want to create and store in the datastore has an email, and a username. How do I make sure when creating my User object that another User object doesn't also have either the same email or the same username? If I just do a query to see if any other users have already used the username or the email, then there could be a race condition.

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• Emailing a picture to a Google App Engine site

  - by Dan Hook

  I would like to create an app such that I can send an email with a JPEG attachment and then display it on my site. I am fairly certain that the Mail API allows me to do this, but if it isn't possible please let me know. My biggest concern is what are the limits on the attachment size my app can receive, and what are the quotas related to receiving email? The email quotas I saw seemed to specify quotas for outgoing email. Is it different for incoming mail?

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• Google App Engine Python Datastore

  - by python appengine

  Basically what Im trying to make is a data structure where it has the users name, id, and datejoined. Then i want a "sub-structure" where it has the users "text" and the date it was modified. and the user will have multiple instances of this text. class User(db.Model): ID = db.IntegerProperty() name = db.StringProperty() datejoined = db.DateTimeProperty(auto_now_add=True) class Content(db.Model): text = db.StringProperty() datemod= db.DateTimeProperty(auto_now_add = True) Is the code set up correctly?

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• OnetoMany and ManytoMany using Grails and JPA on google app engine

  - by adddd

  I googled a lot but i find crap documentation about jpa. I had to implement a domain model like cat and dog inherit from animal, and animal has a one to many and a many to many relation. How to do that?

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• Exception Handaling in google app engine

  - by Rahul99

  i am raising exception using if UserId == '' and Password == '': raise Exception.MyException , "wrong userId or password" but i want print the error message on same page class MyException(Exception): def __init__(self,msg): Exception.__init__(self,msg)

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• importing app engine sample in eclipse

  - by tsey76

  Downloaded GAE sample code and copied into Eclipse pydev explorer and got following errors on execution Traceback (most recent call last): File "C:\Program Files\Google\google_appengine\dev_appserver.py", line 67, in <module> run_file(__file__, globals()) File "C:\Program Files\Google\google_appengine\dev_appserver.py", line 63, in run_file execfile(script_path, globals_) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_main.py", line 417, in <module> sys.exit(main(sys.argv)) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver_main.py", line 360, in main config, matcher = dev_appserver.LoadAppConfig(root_path, {}) File "C:\Program Files\Google\google_appengine\google\appengine\tools\dev_appserver.py", line 3441, in LoadAppConfig raise AppConfigNotFoundError google.appengine.tools.dev_appserver.AppConfigNotFoundError

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• google app engine db.Model in python only display user-defined fields

  - by MattM

  I'm a python newbie so I apologize in advance if this question has been asked before. I am building out an application in GAE and need to generate a report that contains the values for a user-defined subset of fields. For example, in my db model, CrashReport, I have the following fields: entry_type entry_date instance_id build_id crash_text machine_info I present a user with the above list as a checkbox group from which they select. Whichever fields the user selects, I then create a report showing all the values in the datastore, but only for the fields that they selected. For example, if from the above list, the user selects the build_id and crash_text fields, the output might look like this: build_id crash_text 0.8.2 blown gasket 0.8.2 boom! 0.8.1 crack! ... So the question is, how exactly do I only access the values for the fields which the user has defined?

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• Google App Engine: Which is its RDBMS?

  - by Vimvq1987

  According to this: http://code.google.com/appengine/docs/whatisgoogleappengine.html it seems that GAE only uses Datastore to store data, which is equivalent with Table service on Windows Azure Platform. Does anyone know that which RDBMS it uses? or such thing exists or not?

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• Google App Engine + AWS S3 file protection!

  - by grep

  Hi all, I have an application running on GAE/J that streams video from AWS S3. I need a solution for protecting the video from being stolen and I found that pre-signed URLs might be it (??). How can I create pre-signed URLs from GAE/J or there's a better solution to secure the videos? thanks

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• Many-to-Many Relationship (with properties) in Google App Engine for Java

  - by rvandervort

  I understand from the official documentation on unowned relationships that the app must use sets of Key objects on either side of the relationship. This makes perfect sense. Coming from many years of RDBM-style programming, though, I'm pretty confused about how I can model properties of that relationship itself. For example, if I have entities Category and Entry in my many-to-many relationship and would like to persist a dateAdded property, or some other data that are only relevant when both sides of the relationship are known. I suppose it would be possible to create a third class : CategoryEntry that links the two, but this seems like a kludge. What is the proposed way to model this kind of situation ?

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• What's a good HTML template engine for C++?

  - by apphacker

  Planning to write a website in C++. Would like to use a template system like Clearsilver, but maybe there's a better alternative?

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• any other data format except 'csv' can upload to gae(google-app-engine)

  - by zjm1126

  i can use 'csv' file to upload to gae , and i want to know , can any other data format do this, thanks

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• Google App Engine: Difficulty with Users API (or maybe just a Python syntax problem)

  - by Rosarch

  I have a simple GAE app that includes a login/logout link. This app is running on the dev server at the moment. The base page handler gets the current user, and creates a login/logout url appropriately. It then puts this information into a _template_data dictionary, for convenience of subclasses. class BasePage(webapp.RequestHandler): _user = users.get_current_user() _login_logout_link = None if _user: _login_logout_link = users.create_logout_url('/') else: _login_logout_link = users.create_login_url('/') _template_data = {} _template_data['login_logout_link'] = _login_logout_link _template_data['user'] = _user def render(self, templateName, templateData): path = os.path.join(os.path.dirname(__file__), 'Static/Templates/%s.html' % templateName) self.response.out.write(template.render(path, templateData)) Here is one such subclass: class MainPage(BasePage): def get(self): self.render('start', self._template_data) The login/logout link is displayed fine, and going to the correct devserver login/logout page. However, it seems to have no effect - the server still seems to think the user is logged out. What am I doing wrong here?

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• Google app engine-php: script handler

  - by Eve

  I try to create php web app using GAE. In the GAE tutorial, "A script handler executes a PHP script to handle the request that matches the URL pattern. The mapping defines a URL pattern to match, and the script to be executed" Now I want to map the url with the file having same name in the folder, e.g. if the url is /hello.* , it will map the file name hello.php in the folder. And if it is /hello1.*, hello1.php in the folder will be responded to the server. I thought this should be done directly by mapping the name of the url with the name in the folder. But if I left empty for the handler in the app.yaml, I got an error. So I want to know how to set up the handler in app.yaml?

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• How to enforce unique field value in java Google App Engine

  - by supercobra

  Hello there, I am try to find out how to enforce uniqueness in fields other than the unique id. Example: @PersistenceCapable(identityType = IdentityType.APPLICATION) public class User implements IsSerializable { @PrimaryKey @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) private Long id; @Persistent private String name; @Persistent private String email; // <= I want this to be unique as well } In the example above, how can I enforce uniqueness of the email value across the database? Daniel

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• No Content-Length field in the HTTP response header (google app engine)

  - by Max

  Content-Length header is missing when I try to download rar, exe, msi static files, though response for images contains Content-Length, but if I change rar extension to jpg it doesn't. How do I solve this?

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• Google App Engine - Delete until count() <= 0

  - by user365918

  What is the difference between these 2 pieces of code? query=Location.all(keys_only=True) while query.count()>0: db.delete(query.fetch(5)) # -- while True: query=Location.all(keys_only=True) if not query.count(): break db.delete(query.fetch(5)) They both work.

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• google app engine dev server logs location

  - by Phil

  Really simple question. I'm on Ubuntu 9.04 (I'm new to Ubuntu) and I can't find the dev server logs for GAE. Could somebody tell me where they are? Googling hasn't returned a result.

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• app-engine-rest-server to raise KeyError("name %s already used" % model_name)

  - by fx

  I'm playing with the project appengine-rest-server to create the REST webservices for all the existing models. I got a strange error, the first time I query the browser: http://localhost:8080/rest/metadata/user, it gives me the result: <xs:schema> - <xs:element name="user"> - <xs:complexType> - <xs:sequence> <xs:element maxOccurs="1" minOccurs="0" name="key" type="xs:normalizedString"/> <xs:element maxOccurs="1" minOccurs="0" name="surname" type="xs:string"/> <xs:element maxOccurs="1" minOccurs="0" name="firstname" type="xs:string"/> <xs:element maxOccurs="1" minOccurs="0" name="ages" type="xs:long"/> <xs:element maxOccurs="1" minOccurs="0" name="sex" type="xs:boolean"/> <xs:element maxOccurs="1" minOccurs="0" name="updatedDate" type="xs:dateTime"/> <xs:element maxOccurs="1" minOccurs="0" name="createdDate" type="xs:dateTime"/> </xs:sequence> </xs:complexType> </xs:element> </xs:schema> But refreshing the page, gives me this error: Traceback (most recent call last): File "/Users/foo/Documents/AppEngine/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 3185, in _HandleRequest self._Dispatch(dispatcher, self.rfile, outfile, env_dict) File "/Users/foo/Documents/AppEngine/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 3128, in _Dispatch base_env_dict=env_dict) File "/Users/foo/Documents/AppEngine/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 515, in Dispatch base_env_dict=base_env_dict) File "/Users/foo/Documents/AppEngine/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 2387, in Dispatch self._module_dict) File "/Users/foo/Documents/AppEngine/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 2297, in ExecuteCGI reset_modules = exec_script(handler_path, cgi_path, hook) File "/Users/foo/Documents/AppEngine/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/tools/dev_appserver.py", line 2195, in ExecuteOrImportScript script_module.main() File "/Users/foo/Documents/AppEngine/helloworld/main.py", line 48, in main rest.Dispatcher.add_models({"user": UserModel}) File "/Users/foo/Documents/AppEngine/helloworld/rest/__init__.py", line 845, in add_models cls.add_model(model_name, model_type) File "/Users/foo/Documents/AppEngine/helloworld/rest/__init__.py", line 863, in add_model raise KeyError("name %s already used" % model_name) KeyError: 'name user already used' Can someone give me the explanation on why it happens? Restarting the server, run on the browser again I get the xml result, but refreshing causes the error. Is it a bug in the appengine-rest-server application or it is in my code? My helloworld application is available for download here.

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• problem of setting audit rules: Syscall name unknown: stime

  - by zhaojing

  I am setting audit rules in /etc/audit/audit.rules. As the requirement : The audit system should be configured to audit all administrative, privileged, and security actions. So I add one line into /etc/audit/auditd.rules: -a exit,always -S stime -S acct -S reboot -S swapon However, after I restart audit.d by service auditd restart: There is error comeout: Stopping auditd: [ OK ] Starting auditd: [ OK ] Syscall name unknown: stime There was an error in line 14 of /etc/audit/audit.rules It seems stime can't be recognized. Could anybody help me to find out what is wrong with my added rule? Thanks a lot!

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• Identify Deprecated Rules on Checkpoint Firewall

  - by Basa

  I've been asked to find the deprecated rules among the thousands of rules in our Checkpoint firewall. I could do it by writing a perl program to analyze the log and lists of objects & rules, but i wanted to know if anybody knows of an easier way before reinventing the wheel. I have access to SmartView Monitor et SmartView Tracker and i wanted to know if anybody knew of a way to achieve my goal with those tools.

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• URL Parts available to URL Rewrite Rules

  URL Rewrite is a powerful URL rewriting tool available for IIS7 and newer.  Your rewriting options are almost unlimited, giving you the ability to optimize URLs for search engine optimization (SEO), support multiple domain names on a single site, hiding complex paths and much more. URL Rewrite allows you to use any Server Variable as conditions, and with URL Rewrite 2.0, you can also update them on the fly.  To see all variables available to your site, see this post. An understanding...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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