How to get the number of rows in a table in a Datastore?

Posted by Aftershock on Stack Overflow See other posts from Stack Overflow or by Aftershock
Published on 2010-06-07T10:55:58Z Indexed on 2010/06/07 11:02 UTC
Read the original article Hit count: 169

Filed under:

google-app-engine

|

count

|

size

|

google-datastore

Hi,

In many cases, it could be useful to know the number of a row in a table (a kind) in a datastore using Google Application Engine.
There is not clear and fast solution . At least I have not found one.. Have you?

© Stack Overflow or respective owner

Related posts about google-app-engine

unittest import error with virtualenv + google-app-engine-django

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm working with google-app-engine-django + zipped django. Just running "python manage.py test" succeeded without error. But with virtualenv, test was failed with "import unittest error". same error with Django 1.1. - OSX 10.5.6 - google-app-engine-django (r101 via svn) : r100 was failed with launcher… >>> More
Could not import Django settings into Google App Engine

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello all you Google App Engine experts, I have used Django a little before but am new to Google App Engine and am trying to use it's development web server with Django for the first time. I don't know if this is relevent but I previously had Django 1.1 and Python 2.6 on my Windows XP and even… >>> More
How does Google App Engine precompile Java ?

as seen on Stack Overflow - Search for 'Stack Overflow'
App Engine uses a "precompilation" process with the Java bytecode of an app to enhance the performance of the app in the Java runtime environment. Precompiled code functions identically to the original bytecode. Is there any detailed information what this does? >>> More
Creating a session scoped bean in Google App Engine using Spring 2.5

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am trying to create a session bean in spring mvc. I am having the following error message when I run my google app engine server in my local box: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'siteController' defined in ServletContext resource [/WEB-INF/springapp-servlet… >>> More
Google App Engine UI Widgets

as seen on Stack Overflow - Search for 'Stack Overflow'
Are there any UI widgets available to the python side of Google App Engine? I'd like something like the collapsed/expanded views of Google Groups threads. Are these type things limited to the GWT side? >>> More

Related posts about count

why i7-860 is two times slower than E3-1220?

as seen on Server Fault - Search for 'Server Fault'
I have financical trading software. It decodes fast/fix messages. I'm running same binaries on two different machines on very similar set of data. Software receive "messages" and decodes them. The general rule - longer message takes more time to decode: i7-860, Windows 7: Debug 18:23:48.8047325… >>> More
Count(*) vs Count(1)

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, just wondering if any of you guys use Count(1) over Count(*) and if there is a noticeable difference for SQL Server 2005 in performance? Or is this just a legacy habit that has been brought forward from days gone past? >>> More
How to JOIN a COUNT from a table, and then effect that COUNT with another JOIN

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi I have three tables Post ID Name 1 'Something' 2 'Something else' 3 'One more' Comment ID PostId ProfileID Comment 1 1 1 'Hi my name is' 2 2 2 'I like cakes' 3 3 3 'I hate cakes' Profile ID Approved 1 1 2 0 … >>> More
SQL COUNT of COUNT

as seen on Stack Overflow - Search for 'Stack Overflow'
I have some data I am querying. The table is composed of two columns - a unique ID, and a value. I would like to count the number of times each unique value appears (which can easily be done with a COUNT and GROUP BY), but I then want to be able to count that. So, I would like to see how many items… >>> More
Design by Contract with Microsoft .Net Code Contract

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
I have done some talks on different events and summits about Defensive Programming and Design by Contract, last time was at Cornerstone’s Developer Summit 2010. Next time will be at SweNug (Sweden .Net User Group). I decided to write a blog post about of some stuffs I was talking about. Users are… >>> More