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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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• 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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• 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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• 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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• Apple Itunes app limitations

  - by user339625

  I have a iphone game that i am creating and wanted to know a couple limitations once the person downloads the game and they sign in with a user name i want them to be able to download new content maps packs etc. What is the limit in size these downloads can be? where can this content be stored? thank you!

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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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• Questions regarding Web Service development in C++

  - by Eduardo León

  The purpose of this question is to play a joke, but the question itself is serious. Inspired by DOS on Dope, I want to make my own framework for Web Service development based on MFC serialization. However, my only experience in Web Service development consists in having written a toy ASP.NET Web Service. All I had to do to expose a method was... [WebMethod] public ReturnType ExposedMethod(InputType1 param1, InputType2 param2) { //... } ... and ASP.NET took care of the rest for me. Obviously, I will have to do everything by hand in my own framework. Thus, I would like to delve a bit more into the little details of how ordinary SOAP Web Services work, in order to replicate them. So I have mainly two questions: Where can I find the details on how SOAP Web Services work, and what ASP.NET hides from me? What are the main challenges I am going to find in my completely lunatic project?

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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: 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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• How can I close the currently running server app when I launch new debug session?

  - by Eonil

  Google App Engine (GAE) Java SDK uses eclipse as main IDE. IDE runs a server app when I launch debugging session. And it runs another server app when I launch debugging session again. It closes the server app when I stop the debugging session, but it doesn't when I re-launch debugging session. Re-launching means stop and launch again. Why does it stop existing app? So I have to close the server app manually at each time. Is there a way to close existing running app when re-launching debugging session?

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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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• 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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• 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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• 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 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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• amazon web services and sql server support

  - by user25011

  Hi All, I have built my application using sql server 2008 and .net framework 3.5 I am looking for a sclable hosting service and have come to think of amazon web services. Does amazon also support hosting of sql server 2008 databases? What hosting services do you advise Thank you.

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• Cloning/copying traffic from production web cluster to test web cluster

  - by Marko Kevac

  Hello. We have 10 machine web cluster with approximately 1500 req/seq. How can we copy/clone all user traffic that comes to this production cluster in order to test new version of software, which is installed on a little bit smaller test cluster? It should be copy, not load balancing, i.e. real users must receive answer from production cluster, not testing one. OS: Linux Thanks.

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• need a tutorial for ISA Server 2006 web publishing

  - by George2

  Hello everyone, Anyone could recommend me a document for ISA Server 2006 Web Publishing? I want to learn it step by step and also wants to try Path Mapping feature. thanks in advance, George

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• Best Linux flavor for web application development (LAMP)

  - by Jean

  Hello, Currently I am using Fedora 12/13 for web application (LAMP) development. Would serious users of LAMP consider any other flavor. Usage is for my laptop. If you require more info, pls request, just wrote what I am looking for Thanks Jean

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• FIle Services Resource Manager alternative for Windows Web Server 2008

  - by Alexey Zakharov

  Hi guys, We need to provide disk quota managment for specific folders. On our hosting server Windows Web Server edition is installed. It has not File Server role that is why I cannot use FIle Services Resource Manager. Is there any alternative product (it would be great if it is opensource or freeware) which can perform the same task? Best regards, Alexey Zakharov

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• Which laptop should I get for web design / development

  - by Mikey1010

  Hi, I require to buy a laptop, but I'm clueless really-need a laptop that will run the usual software for web work-photoshop,fireworks,dreamweaver,flash etc but also run php and .net, maybe most programs open at same time. My budget is between £400-£600 ($600-$900) please provide links if possible! Any help is very much appreciated.

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• Which laptop should I get for web design / development

  - by Mikey1010

  Hi, I require to buy a laptop, but I'm clueless really-need a laptop that will run the usual software for web work-photoshop,fireworks,dreamweaver,flash etc but also run php and .net, maybe most programs open at same time. My budget is between £400-£600 ($600-$900) please provide links if possible! Any help is very much appreciated.

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• Could you share your emacs dot-files for web development

  - by Gok Demir

  Hi, could you kindly share your emacs dot-files for web development that works with CSS, HTML, JavaScript, PHP and if possible with Python Django. I really need complete setup. I looked nXhtml and its good on some parts (html code completion works but sucks on indentation and CSS code completion does not work and says tag table is empty most cases. I really need something that works: code completion works out of the box, git integration and pretty indentation and supports multi-mode for mixed HTML, CSS, JavaScript, PHP code.

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• Remote Web in SBS 2011 Essentials (SSL Issue)

  - by MetalSearGolid

  I am having an issue setting up Remote Web in SBS 2011 Essentials. Everything works except Remote Desktop, which keeps giving me SSL cert errors. Is there a way to override the TS Gateway's decision to not allow cert errors? If not, the specific error I am getting is that Remote Desktop is trying to connect using the DNS short name of our domain controller, but the certificate uses the FQDN, and as such, it reports an error and the connection never happens. Any ideas?

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