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• What is an Entity? Why is it called Entity?

  - by rkrauter

  What is the deal with Entities (when talking about the Entity Framework)? From what I understand, it is pretty much an in memory representation of a data store like sql tables. Entities are smart enough to track changes and apply those changes to the data store. Is there anything more to it? Thanks in advance.

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• Summer Activity or Internship in Europe [2010] [closed]

  - by mrlinx

  I'm a graduate student looking for week(s) long activity in the summer. Because the summer isn't very long for students in my college, I'm not looking for a 3 month full-time internship, but some kind of activity where I can experience subjects related to computer science, entrepreneurship and team management. Do you know any? Recommend a better place to look for this?

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• IDataErrorInfo vs ValidationRule vs Exception

  - by WPF User

  Can anyone tell me which is a better approach for Validation in WPF. 1. Implementing IDataErrorInfo 2. Creating ValidationRule 3. Throwing Exceptions in terms of performance, memory leaks, code maintainability and re-use.

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• PHP: optimum configuration storage ?

  - by Jerome WAGNER

  Hello, My application gets configured via a lot of key/values (let's say 30.000 for instance) I want to find the best deployment method for these configurations, knowing that I want to avoid DEFINEs to allow for runtime re-configuration. I have thought of - pre-compiling them into an array via a php file - pre-compiling them into a tmpfs sqlite database - pre-compiling them into a memcached db what are my options for the best random access time to these configuration (memory is not an issue) ? Thanks Jerome

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• Caveats of select/poll vs. epoll reactors in Twisted

  - by David

  Everything I've read and experienced ( Tornado based apps ) leads me to believe that ePoll is a natural replacement for Select and Poll based networking, especially with Twisted. Which makes me paranoid, its pretty rare for a better technique or methodology not to come with a price. Reading a couple dozen comparisons between epoll and alternatives shows that epoll is clearly the champion for speed and scalability, specifically that it scales in a linear fashion which is fantastic. That said, what about processor and memory utilization, is epoll still the champ?

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• What is your bug/task tracking tool?

  - by Ilya

  This is a placeholder for overviews of bug/task tracking systems. What i want to do here is: List all tools used in the industry (please provide a link to the tool discussed) Gather opinions on each tool (please back up your opinion with facts i.e provide advantages and disadvantages) Please put each tool in separate answer and please make it community owned wiki to give an option to add/edit to as many people as possible. Related posts: What is your tool for version control (FAQ) Free/Cheap Task/Bug Management software What bug tracking software do you use?

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• Garbage collection in Perl

  - by srikfreak

  Unlike Java, Perl uses reference count for garbage collection. I have tried searching some previous questions which speak about C++ RAII and smart pointers and Java GC but have not understood how Perl deals with the circular referencing problem. Can anyone explain how Perl's garbage collector deals with circular references? Is there any way to reclaim circular referenced memory which are no longer used by the program or does Perl just ignores this problem altogether?

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• Simple Fundamental Algorithm Question, binary tree traversal

  - by Ben

  I'm trying to explain to non-computer science major student with many questions. (1)What traverses tree? Is it just logic or actual on off switch generates 1s and 0s traveling the circuit board? where is this tree and node exists CPU/Memory in between? (2)If it is 1s and 0s HOW the circuits understand the line for example p=p.getLeft(); I said search the google or wiki.

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• How to share classes between DLLs

  - by Jamie Hale

  I have an unmanaged Win32 C++ application that uses multiple C++ DLLs. The DLLs each need to use class Foo - definition and implementation. Where do Foo.h and Foo.cpp live so that the DLLs link and don't end up duplicating code in memory? Is this a reasonable thing to do?

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• SQL Rounding Problems in 2005 and 2000

  - by azamsharp

  I have a value in the database which is 2.700000002. When I run a query in Management studio in SQL SERVER 2005 I get 2.7. But when I run in SQL SERVER 2000 query analyzer it comes 2.700000002. 2.70000002 is correct why is SQL SERVER 2005 trying to change the value by rounding it or selecting the floor value?

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• what is programmer job or task?

  - by sam

  Hi, what is programmer job or tasks? is it only programming, or it includes software testing,windows installer, network management, helpdesk, documentation??? AS I am a graduate developer, I feel like I am doing everything, from upgrading hardware, installing antivirus, ...everything.... and of course coding... thanks

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• Lazy load pages in UIScrollView

  - by jean

  I have a UIScrollView that contains large images and am using paging to scroll between images. In order to save memory, I am loading only one image before and after the currently visible one and loading/releasing new images after a scroll has completed. The problem occurs when one scrolls quickly and scrollViewDidEndDecelerating is not called. How can I detect continuous scrolling? I could check item location on every scrollViewDidScroll but this seems a bit heavy...

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• WPF Graph Layout Component

  - by Jörg B.

  Does anyone know of or even better.. can wholeheartedly recommend a WPF graph layout component (Microsoft Research had GLEE a while back but it hasn't been updated after 1.0 since 2007 and isn't WPF etc) as seen e.g. in the screenshot below? I've seen yFiles WPF and Lasalle's AddFlow for WPF, but are there any alternatives? (c) Screenshot: RedGate Ants Memory Profiler

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• Can we use JCR API over MySQL?

  - by n_mysql

  Apache Jackrabbit (or the JCR API) helps you separate the data store from the data management system. This would mean that every data store provider would have to implement the JCR API for his own data store. The question is JCR implemented for MySQL? Can we use the JCR API over MySQL? I want to truly abstract out where i store my content, so that tomorrow if i don't want to use a relational DB i can swap it out with the file system with ease.

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• Where to get Rhino Commons

  - by Rasmus Christensen

  Hi I'm working on an asp.net mvc project using nhibernate. At the moment I think Rhino Commons session management is the best spproach to control isession. But Where should I get Rhino Commons From? I found it located on Horn, Github, think the svn is obsolete. Please point me to a version that works.

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• DB2 - How to run an ad hoc select query with a parameter in IBM System i Access for Windows GUI Tool

  - by KenB

  I would like to run some ad hoc select statements in the IBM System I Navigator tool for DB2 using a variable that I declare. For example, in the SQL Server world I would easily do this in the SQL Server Management Studio query window like so: DECLARE @VariableName varchar(50); SET @VariableName = 'blah blah'; select * from TableName where Column = @VariableName; How can I do something similar in the IBM System I Navigator tool?

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• Differnce between linux write and sendfile syscall

  - by JosiP

  Hi Im programming webserver (C), which should send big files. My question is: What are the main differneces in two syscalls: write and sendfile. Does sendfile depends on size of socket system buffer ? I noticed that write often writes less then i requested. For example, if got many requests for one file: should i open it, copy into memory and use 'write', or maybe i can do 'sendfile' for each client ? thx in advance for all answers

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• Spring HibernateTemplate: how it deals with transactions?

  - by EugeneP

  Could you explain, what happens behind the scene? Transaction management when using this template in Spring is absolutely unclear. What if I invoke 10 DAO methods that all use the same Hibernatetemplate and I invoke them one after another? Every method runs within its own transaction? It's not effective is not it?

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• what architecture to use with asp.net mvc vd web forms

  - by kacalapy

  please explain how to get high capacity architectures with both the default asp.net web forms and mvc models with regard to being able to serve millions of page views. i want to know how to set up each model from DB clustering, to caching, logical/ physical tiers, load balancing iis servers, scaling out or up, session state management and so on... is one more scalable than the other? thanks all.

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• How to simulate a USB drive

  - by rursw1

  Hi all, Is it possible to simulate a USB drive with software only? I mean, for example, to expose a local memory space to the OS so the device manager will recognize it as a USB device. I'm not familiar with hardware implementation, but I'm sure that it is possible somehow to emulate the USB protocol. I began with this book - USB Design By Example. Can anyone please give me additional references to begin with? Thank in advance!

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• iPhone App runtime error- "Error: Embedded profile header length is greater than data length.\n"

  - by Rob Lourens

  This error Thu Apr 8 20:24:15 iPod-touch appname[947] <Error>: Error: Embedded profile header length is greater than data length.\n Thu Apr 8 20:24:16 iPod-touch appname[947] <Error>: Error: Embedded profile header length is greater than data length.\n is logged when a UIImageView is loaded. The view isn't huge but it has a few other UIImageViews as subviews and it might be related to memory, but I can't find anything on this message. Any ideas?

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• Telerik RadEditor Find & Replace in HTML View

  - by Jim

  We use Telerik's RadEditor for our content management system's WYSIWYG editor. We need the find & replace functionality that is in the WYSIWYG editor to also be in the HTML editor. The editor is pretty customizable, anyone know if there is a way to enable this or hack it in?

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• Using WIX to install a WMI provider.

  - by Simmen

  I have developed a WMI provider in C# using the System.Management.Instrumentation namespace. I need to install the provider into the GAC and register it with the WMI repository using MSI. How might I accomplish this with WIX?

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• Difference between the List and Enumeration

  - by harigm

  I have a written a method to get all the records and return in the List Type, but I got out of memory error. So I changed return type from List to Enumeration, in the method, instead of ArrayList, uses Vector and return vector.elements at the end of the method. It works without any error. but I did not understand why. Could someone explain Why this Enumeration worked?

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• How to using Mono for windows to Access WMI to get hardware Id?

  - by guaike

  Hi, folks Recently,I need run my winforms App on mono for windows platform,But i am using WMI to get MAC address and CPU ID in my original code,switch to Mono for Windows,it does not working. I found that "System.Management.dll" APIs is not implemented in Mono. How can i do?How to get CPU ID,MAC Address, Hard Disk Serial Number,and Motherboard Serial Number with out WMI?

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