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• Database Design Question: GUID + Natural Numbers

  - by Alan

  For a database I'm building, I've decided to use natural numbers as the primary key. I'm aware of the advantages that GUID's allow, but looking at the data, the bulk of row's data were GUID keys. I want to generate XML records from the database data, and one problem with natural numbers is that I don't want to expose my database key's to the outside world, and allow users to guess "keys." I believe GUID's solve this problem. So, I think the solution is to generate a sparse, unique iD derived from the natural ID (hopefully it would be 2-way), or just add an extra column in the database and store a guid (or some other multibyte id) The derived value is nicer because there is no storage penalty, but it would be easier to reverse and guess compared to a GUID. I'm (buy) curious as to what others on SO have done, and what insights they have.

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• how do copyright permission systems for content hosting sites work?

  - by zebraman

  I am wondering about subscription sites that host content, like recorded performances from concerts. I'm sure there is a tangle of copyright permissions that must be granted for these video/audio files to be hosted. For example, if a band plays a cover of another band's song, permission must be obtained from not only the band that performed, but the band that owns the song. Perhaps even from the venue that hosted the performance, to record the video and post the content. I am curious how websites that host content like this work. How might an automated copyright system work to keep track of who has ownership of certain performances and obtain permission from said owners to record and post their content.

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• Different ways to specify libraries to gcc/g++

  - by abigagli

  I'd be curious to understand if there's any substantial difference in specifying libraries (both shared and static) to gcc/g++ in the two following ways (CC can be g++ or gcc) CC -o output_executable /path/to/my/libstatic.a /path/to/my/libshared.so source1.cpp source2.cpp ... sourceN.cpp vs CC -o output_executable -L/path/to/my/libs -lstatic -lshared source1.cpp source2.cpp ... sourceN.cpp I can only see a major difference being that passing directly the fully-specified library name would make for a greater control in choosing static or dynamic versions, but I suspect there's something else going on that can have side effects on how the executable is built or will behave at runtime, am I right? Andrea.

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• Does my OS will support these tools ?

  - by Zerotoinfinite

  I am currently using Windows Server 2003 and I want to install Windows XP [SP1 or SP2 or SP3] or may be VISTA. I have may application which I can run on Windows Server 2003 and I am curious to know If I could run the same on XP or Vista. Please help me deciding whether I change my OS or not, here is the List of software and app I want to work on: Visual Studio 2008/2010 SQL Server 2008 ASP.NET MVC and Entity Framework WPF application P.S. : I can create all my application [except WPF] with Windows Server 2003. I have a idea that I can install VS 2008 on XP but not exactly sure about MVC framework and other latest technology stuff.

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• What is @namespace field in C# class?

  - by MainMa

  Hi, I'm browsing the source code of StyleCop, and I found a curious thing: /// <summary> /// The namespace that the rule is contained within. /// </summary> private string @namespace; // [...] internal Rule(string name, string @namespace, string checkId, string context, bool warning) : this(name, @namespace, checkId, context, warning, string.Empty, null, true, false) { Param.Ignore(name, @namespace, checkId, context, warning); } What is this thing? Is it just a simple field where at-sign is used to indicate that it is a field, and not a namespace keyword? If so, may at-sign be used for any reserved word (for example @dynamic, @using, etc.)?

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• Are PDO prepared statements sufficient to prevent SQL injection?

  - by Mark Biek

  Let's say I have code like this: $dbh = new PDO("blahblah"); $stmt = $dbh->prepare('SELECT * FROM users where username = :username'); $stmt->execute( array(':username' => $_REQUEST['username']) ); The PDO documentation says The parameters to prepared statements don't need to be quoted; the driver handles it for you. Is that truly all I need to do to avoid SQL injections? Is it really that easy? You can assume MySQL if it makes a difference. Also, I'm really only curious about the use of prepared statements against SQL injection. In this context, I don't care about XSS or other possible vulnerabilities.

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• How do you run your unit tests? Compiler flags? Static libraries?

  - by Christopher Gateley

  I'm just getting started with TDD and am curious as to what approaches others take to run their tests. For reference, I am using the google testing framework, but I believe the question is applicable to most other testing frameworks and to languages other than C/C++. My general approach so far has been to do either one of three things: Write the majority of the application in a static library, then create two executables. One executable is the application itself, while the other is the test runner with all of the tests. Both link to the static library. Embed the testing code directly into the application itself, and enable or disable the testing code using compiler flags. This is probably the best approach I've used so far, but clutters up the code a bit. Embed the testing code directly into the application itself, and, given certain command-line switches either run the application itself or run the tests embedded in the application. None of these solutions are particularly elegant... How do you do it?

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• Accessing entire netflix catalog via API v1.5

  - by Stone

  Netflix recently updated their API methods for obtaining the full Netflix catalog. I'm curious if anyone has had any success accessing these new xml documents and downloading them via API v1.5 (9/2012). Previously, you could download the entire Netflix catalog via one API call (which I had working perfectly). Now, there are supposedly two calls to make: one for dvd's and one for streaming movies. I cannot make these calls return anything except for an empty array. Please don't offer an answer unless you have personally downloaded the entire catalog via these new API's. Bonus points if you can tell me how to do it in Ruby. http://developer.netflix.com/blog/read/Update_Changes_for_the_Public_API

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• What are the primary advantages of Visual Studio Team Foundation Server over the other versions?

  - by Andrew Dunaway

  We are looking into the possibility of upgrading to Team Foundation Server 2008 for our development team. One of our primary reasons is some of the deployment capabilities surrounding BizTalk 2009, but I am curious what other benefits there are for other projects outside of BizTalk. Some of our interests so far are moving to a one click build and deploy process, the addition of unit tests, and continuous integration. Some definite steps forward for the company I work for. What other benefits or information should I look at as I pitch this to upper management? I am looking for technical reasons, money is a not really a concern for this discussion.

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• SVG Using Adobe in IE doesn't work when loading page, but saving the page and then loading it works.

  - by Nick

  So I'm trying to get a SVG document to load in IE. I can see it fine, but all calls to .getSVGDocument() fail, the svg onload="onload()" function never gets called and the right-click Adobe SVG Viewer context menu doesn't show up when right-clicking on the svg. It seems as though I'm managing to crash the adobe SVG viewer or something before it is able to call the onload function but after it has drawn the SVG document. As a test I saved the html page to my hard drive and loaded it up and walla - it works! Right-click, onload, and .getSVGDocument() all work. Very curious. For some reason getting the page from the server makes the adobe plugin crap out but loading up static HTML is fine. Any thoughts?

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• Whats the deal with python?

  - by gmatt

  My interests in programming lie mainly in algorithms, and lately I have seen many reputable researchers write a lot of their code in python. How easy and convenient is python for scientific computing? Does it have a library of algorithms that compares to matlab's? Is Python a scripting language or does it compile? Is it a great language for prototyping an algorithm? How long would it take me to learn enough of it to be productive provided I know C well and OO programming somewhat? Is it OO based? Sorry for the condensed format of questions, but I'm very curious and was hoping a more experienced programmer could help me out.

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• Conceptually, how does replay work in a game?

  - by SnOrfus

  I was kind of curious as to how replay might be implemented in a game. Initially, I thought that there would be just a command list of every player/ai action that was taken in the game, and it then 're-plays' the game and lets the engine render as usual. However, I have looked at replays in FPS/RTS games, and upon careful inspection even things like the particles and graphical/audible glitches are consistent (and those glitches are generally *in*consistent). So How does this happen. In fixed camera angle games I though it might just write every frame of the whole scene to a stream that gets stored and then just replays the stream back, but that doesn't seem like enough for games that allow you to pause and move the camera around. You'd have to store the locations of everything in the scene at all points in time (No?). So for things like particles, that's a lot of data to push which seems like a significant draw on the game's performance whilst playing.

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• initializing properties with private sets in .Net

  - by Martin Neal

  public class Foo { public string Name { get; private set;} // <-- Because set is private, } void Main() { var bar = new Foo {Name = "baz"}; // <-- This doesn't compile /*The property or indexer 'UserQuery.Foo.Name' cannot be used in this context because the set accessor is inaccessible*/ using (DataContext dc = new DataContext(Connection)) { // yet the following line works. **How**? IEnumerable<Foo> qux = dc.ExecuteQuery<Foo>( "SELECT Name FROM Customer"); } foreach (q in qux) Console.WriteLine(q); } I have just been using the private modifier because it works and kept me from being stupid with my code, but now that I need to create a new Foo, I've just removed the private modifier from my property. I'm just really curious, why does the ExecuteQuery into an IEnumerable of Foo's work?

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• Sort database entries via a dropdown list

  - by Lin

  Hello! I'm curious if anyone could possibly help me, because I can't find anything exactly related to it anywhere, and it's driving me nuts. I'd like to have a dropdown list on a page, that will give the visitor the option to sort all entries by year. I have entries from i.e. 2001, 2005, 2009, 2010. The years should be displayed in the dropdown, so the visitor can easily just select all entries dated 2001 if they want. The year for each entry is located in the one database table I have. In other words, I simply want a "sort by" dropdown that you can see on pretty much any shopping site nowadays. But with set years. Thanks in advance for any replies!

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• can anyone explain the why the the 1st example gets different results than the following 2

  - by klumsy

  $b = (2,3) $myarray1 = @(,$b,$b) $myarray1[0].length #this will be 1 $myarray1[1].length $myarray2 = @( ,$b ,$b ) $myarray2[0].length #this will be 2 $myarray[1].length $myarray3 = @(,$b ,$b ) $myarray3[0].length #this will be 2 $myarray3[1].length UPDATE I think on #powershell IRC we have worked it out, Here is another example that demonstrates the danger of breaking with the comma on the following line rather than the top line when listing multiple items in an array over multiple lines. $b = (1..20) $a = @( $b, $b ,$b, $b, $b ,$b) for($i=0;$i -lt $a.length;$i++) { $a[$i].length } "--------" $a = @( $b, $b ,$b ,$b, $b ,$b) for($i=0;$i -lt $a.length;$i++) { $a[$i].length } produces 20 20 20 20 20 20 -------- 20 20 20 1 20 20 I'm curious how people will explain this. I think i understand it now, but would have trouble explaining it in a concise understandable fashion, though the above example goes somewhat towards that goal.

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• Rails: include related object in JSON output

  - by Codezy

  I have a note class that belongs to a user (ie a user can create many notes). clip from my notes controller class NotesController < ApplicationController before_filter :authenticate_user! respond_to :html, :xml, :json # GET /notes # GET /notes.xml def index @notes = Note.includes(:user).order("created_at DESC") respond_with @notes end When I ask for the index in json results for example /notes.json, it returns the notes but only returns user_id for the user object. I would like it to also include user.username (and would be curious how to have the whole user object embedded). Bonus question: I could not find a way to make the column show as author_id and have it relate back to user. If this is easy to do, how do you do it?

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• what factors should a fresher(for programmer job) consider and learn before saying yes to employer f

  - by Senthil

  what factors should a fresher(for programmer job) consider and learn before saying yes to employer for job offer? and to contract? and most importantly how should one get the details?how can I approach them? I know some employers dont want to give such details..right? I have shortlisted by a Software COmpany..that is parter with microsoft. and works on technology like VB ADO.DOTNET,and some other reporting stuffs.,sql servers etc.,Tell me about scope of that..because They are asking me to sign for 2 year certificate bond agreement..I want to be a great programmer and Project Leader after 5 years..advise me guys..Language/OS not problem for me,As I curious to learn more things. Most of the SO members are programmers..so yours advice is greatly appreciated

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• How to handle null {id} on route?

  - by MattSlay

  What if a user hits my site with http://www.mysite.com/Quote/Edit rather than http://www.mysite.com/Quote/Edit/1000 In other words, they do not specify a value for {id}. If they do not, I want to display a nice "Not Found" page, since they did not give an ID. I currentl handle this by accepting a nullable int as the parameter in the Controller Action and it works fine. However, I'm curious if there a more standard MVC framework way of handling this, rather than the code I presently use (see below). Is a smoother way to handle this, or is this pretty mush the right way to do it? [HttpGet] public ActionResult Edit(int? id) { if (id == null) return View("QuoteNotFound"); int quoteId = (int)id; var viewModel = new QuoteViewModel(this.UserId); viewModel.LoadQuote(quoteId); if (viewModel.QuoteNo > 0) { return View("Create", viewModel.Quote.Entity); } else return View("QuoteNotFound"); }

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• How to break whenever any line of code executes

  - by Aequitarum Custos

  I have a very strange bug, which I believe is caused by some code we have executing, but I'm not sure where. We can reproduce it to the point it happens whenever we click Tab, but short of putting a break point at the beginning of every method in the project to find out what is executing. Is there a way to set visual studio to break whenever anything executes? For those curious about the problem, every now and then, we have a few Rich Text Boxes that refuse to lose focus. You can't click out of it or tab out of it. We have no On Validation or On Text Changed events attached to the control, and believe it's an event attached somewhere else to something we just aren't noticing.

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• Is there a way to define a List<> of two elements string array?

  - by Alexander Prokofyev

  I want to build two-dimentional array of strings where length of one dimention is 2. Similar to this string[,] array = new string[,] { {"a", "b"}, {"c", "d"}, {"e", "f"}, {"g", "h"} } Doing List<string[]> list = new List<string[]>(); list.Add(new string[2] {"a", "b"}); list.Add(new string[2] {"c", "d"}); list.Add(new string[2] {"e", "f"}); list.Add(new string[2] {"g", "h"}); list.ToArray(); gives me string[][] but not string[,] array. Just curious, is there some trick to build dynamically string[,] array somehow?

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• How do I make a symlink to every directory in the current directory that has the same name but has u

  - by Jason Baker

  For instance, I suppose I have a directory that contains the following folders foo_bar baz What I would like to have is a bash command that will make a symlink foo-bar to foo_bar so it would look like this: foo-bar foo_bar baz I'm pretty sure I can write a Python script to do this, but I'm curious if there's a way to do this with bash. Here's where I'm stuck: ls -1 | grep _ | xargs -I {} ln -s {} `{} | sed 's/_/-/'` What I'm trying to do is run the command ln -s with the first argument being the directory name and the second argument being that name passed through sed s/_/-/. Is there another way to do this?

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• postgresql duplicate table names best practice

  - by veilig

  My company has a handful of apps that we deploy in the websites we build. Recently a very old app needed to be included along side a newer app and there was a conflict w/ a duplicate table name needed to be used by both apps. We are now in the process of updating an old app and there will be some DB updates. I'm curious what people consider best practice (or how do you do it) to help ensure these name collisions don't happen. I've looked at schema's but not sure if thats the right path we want to take. As the documentation prescribes, I don't want to "wire" a particular schema name into an application and if I add schema's to the user search path how would it know which table I was referring to if two schema's have the same table name. although, maybe I'm reading to much into this. Any insights or words of wisdom would be greatly appreciated!

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• Are C++ Reads and Writes of an int atomic

  - by theschmitzer

  I have two threads, one updating an int and one reading it. This value is a statistic where the order of the read and write is irrelevant. My question is, do I need to synchronize access to this multi-byte value anyway? Or, put another way, can part of the write be complete and get interrupted, and then the read happen. For example, think of value = ox0000FFFF increment value to 0x00010000 Is there a time where the value looks like 0x0001FFFF that I should be worried about? Certainly the larger the type, the more possible something like this is I've always synchronized these types of accesses, but was curious what the community thought.

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• Fade out/in sperate divs with button click

  - by user1914298

  I saw a flash website and was curious to now if this is something possible to build using Jquery, obviously not the entire thing. I was more looking to fade out div1 and div2 with a button click. This is the example site: www.justinfarrellyconstruction.com Example: If i come to the homepage and click the portfolio button the Gallery Div will fade out then fade in another image. At the same time the Text div will fade out its content and load the portfolio text. My apologies if this does not make sense, this is all quite new to me and im trying got learn.

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• memcached cluster maintenance

  - by Yang

  Scaling up memcached to a cluster of shards/partitions requires either distributed routing/partition table maintenance or centralized proxying (and other stuff like detecting failures). What are the popular/typical approaches/systems here? There's software like libketama, which provides consistent hashing, but this is just a client-side library that reacts to messages about node arrivals/departures---do most users just run something like this, plus separate monitoring nodes that, on detecting failures, notify all the libketamas of the departure? I imagine something like this might be sufficient since typical use of memcached as a soft-state cache doesn't require careful attention to consistency, but I'm curious what people do.

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