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• Date range intersection in SQL

  - by Will

  I have a table where each row has a start and stop date-time. These can be arbitrarily short or long spans. I want to query the sum duration of the intersection of all rows with two start and stop date-times. How can you do this in MySQL? Or do you have to select the rows that intersect the query start and stop times, then calculate the actual overlap of each row and sum it client-side?

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• Tomcat: Cache-Control

  - by Itay

  Jetty has a CacheControl parameter (can be specified webdefault.xml) that determines the caching behavior of clients (by affecting headers sent to clients). Does Tomcat has a similar option? In short, I want to turn off caching of all pages delivered by a tomcat server and/or by a specific webapp?

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• Why do websites generate random alphanumeric strings for urls instead of using row ids?

  - by jorm

  Why does many sites (youtube is good example) generate string of random number and letter instead of using for example the row id? usually its something likes this bla?v=wli4l73Chc0 instead of like bla?id=83934 Is it just to keep it short if you have many rows? Or is there other good things about this? Because i can imagine: bla?id=23934234234 dont look so nice Thanks and cheers

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• stop ReconnectingClientFactory (XmlStreamFactory)

  - by defreng

  Hey guys, I tried to write a XMPP Client using this mentioned factories. Now my program only needs this connection during a short time. How can I make the Factory to stop reconnection attempts? Unfortunately stopTrying doesn't work. Do I have to disconnect running connections before? Any help would be appreciated :)

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• How to test input value for null or zero with jQuery

  - by Matt

  I need to keep the focus on the text input when the user moves to the next input without putting something in the previous one. In short, if it is null (left blank) or not valid, how do I keep the focus on that input until the conditions are satisfied?

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• How do you set the default source for the Output window in Visual Studio?

  - by Grank

  We added a SharePoint BDC model project to a solution in Visual Studio 2010. Ever since, whenever the solution is built, instead of showing the Build output in the Output window, it insists on having "SharePoint Tools" selected in the "Show Output from:" drop-down, just to say "Model validation started ... Model validation completed with no errors." Short of shutting off any SharePoint projects in the build configuration, can this behavior be overridden?

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• Why should I use "Web 2.0"-style URLs?

  - by hydrapheetz

  In short, why use something like http://stackoverflow.com/badges/6/supporter instead of something "simpler" (and subjectively, at that) like http://stackoverflow.com/badges/6/. Even on my own site I've just been using /post/6/ to reference posts (by IDs, even though I still store a slug.) Instead of /post/6/small-rant-on-urls, and in some cases, they can get even more absurd, much more so than is really necessary.

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• Is there a way to communicate with USB devices on Android?

  - by Dan Sosedoff

  Hello folks, I have a really short question: Is it possible to communicate/use USB devices on Android OS? I assume it might be tablet device. Lest say i want to connect some sort of USB card scanner to android tablet. Will it work? Do i need to write drivers by myself? Thanks.

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• Thread Management Object

  - by Gusdor

  I feel rather foolish as this is just a short question. I was reading about a bunch of thread management helper classes in .net, specifically one that aids the storage of threads to help a service manager object automatically invoke delegates onto the subscribing thread. I'm pretty sure it had something to do with creating dispatchers. Totally forgotten the name, can't find it :( Anyone know what I'm talking about?

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• Big, Thick Reference Books (PHP / MySQL / Unix) [closed]

  - by Josh K

  I'm looking for in-depth reference books / guides in PHP, MySQL, and Unix. I'm aware there other other questions pertaining to good books for short references of function names, or detailed beginner guides to these systems. I'm looking for something different. I want a book that I can either use as a quick but in-depth (decent write up, not a pocket reference guide) reference to common functions (JOINS, string manipulation, Regular Expressions, etc) while also providing a detailed inner workings explanation on the system itself.

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• How to avoid fast rate page refresh in ASP.NET ?

  - by eugeneK

  I have a page that shows statistics for users, this cannot be cached because each user has different statistics and there are many thus the real time query must be made. What the way to avoid database server overload when user will click F5's to refresh or to ask different queries in short time intervals ?

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• Is this pointer initialization necessary?

  - by bstullkid

  Lets say I have the following: CHARLINK * _init_link(CHARLINK **link) { short i; (*link)->cl = (CHARLINK **) calloc(NUM_CHARS, sizeof(CHARLINK *)); for (i = 0; i < NUM_CHARS; i++) (*link)->cl[i] = NULL; return (*link); } Is the loop to initialize each element to NULL necessary or are they automatically NULL from calloc?

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• Is pitch and speed the same thing in audio programming context?

  - by mystify

  Pitch means "perceived frequency". Nice. But when I make pitch very low in OpenAL, sound plays a lot of times longer. If I make it very high, sound plays very short but with high frequency. For me, logically the consequence of making slower or faster. Or is pitch != speed?

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• How can I stop cURL from outputting the contents of the page it loads into the browser?

  - by Rob

  I currently use curl_multi_* to connect to a few sites. Its only sending a few $_GET variables to start a script, but it outputs the html from the sites to the browser. I want to stop this. I already use a short timeout, but sometimes the scripts start fast, and I don't want to set the timeout any lower, in case it causes it not to connect. So how can I stop the output to the browser from cURL?

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• Implementing a virtual file system in .NET

  - by Charlie Somerville

  A while back a found a great-looking framework that allowed .net developers to implement a virtual file system. I thought I had bookmarked it, but it seems I haven't. Does anyone know any frameworks for doing this? EDIT: Here's a hint... It had a catchy, short name and it's own domain. Sorry, that's all I can remember :p

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• Can't Get ANT build to work in eclipse

  - by Travis

  Long story short: I want to add the --core-library flag at compile time to include a library that depends on some javax libraries that aren't included in the android platform. I have attempted the walkthrough here: http://commons.apache.org/scxml/usecases/scxml-stopwatch-on-android.html but nothing ever changed on the emulator. I don't think I can repackage the libraries I'm after because I cannot amend the callers to call the new packages without violating a license agreement. Please, someone, point me in the right direction.

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• The Biggest Data Management problems

  - by Ben Breen

  Where does current technology fall short of industry demands in the context of data and information management? In other words, where should the software engineering industry as a whole be focusing its efforts in these areas?

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• Flex Drag and Drop

  - by James_Dude

  Hi I am trying to do a flex drag and drop. It is very similar to this first example. http://livedocs.adobe.com/flex/3/html/help.html?content=dragdrop_7.html The problem is that event.currentTarget.mouseX,mouseY is showing the position where I put the mouse down rather than the position where I had finished dragging. I am just wondering why this could be? If there is a short answer?

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• Mass update of data in sql from int to varchar

  - by Christopher Kelly

  we have a large table (5608782 rows and growing) that has 3 columns Zip1,Zip2, distance all columns are currently int, we would like to convert this table to use varchars for international usage but need to do a mass import into the new table convert zip < 5 digits to 0 padded varchars 123 becomes 00123 etc. is there a way to do this short of looping over each row and doing the translation programmaticly?

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• MVVM, Animations, Binding - I need a quick question answered.

  - by Peanut

  http://stackoverflow.com/questions/2455963/wpf-mvvm-dynamic-animation-using-storyboards There is a question i have found that relates directly to the issue I am having. The answer provided in that thread is a bit short, however. I did a little looking on google for 'attached properties' and i still remain a bit confused. Could someone shed a little light regarding this question? Perhaps provide a little sample code for the link stated above? Thanks in advance

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• python command line yes/no input

  - by h3

  Is there any short way to achieve what APT does in Python ? I mean, when the package manager prompts a yes/no question followed by "[Yes/no]". The scripts accepts YES/Y/yes/y or "enter" (defaults to Yes as hinted by the capital) The only thing I find in the official doc is input/raw_input.. I know it's not that hard to emulate, but it's annoying to rewrite :|

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• Unfamiliar Javascript Syntax

  - by user1051643

  Long and short of the story is, whilst reading John Resig's blog (specifically http://ejohn.org/blog/javascript-trie-performance-analysis/) I came across a line which makes absolutely no sense to me whatsoever. Essentially it boils down to object = object[key] = something; (this can be found in the first code block of the article I've linked.) This has proven rather difficult to google, so if anyone can offer some insight / a good online resource for me to learn for myself, I'd much appreciate it.

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• Looking for 3D xna engines

  - by user269334

  I'm looking for a 3D xna engine that 1. provides GUI interface for editing games 2. provides Skeleton/rigged animation 3. are Well documented (in short, engines like Unreal engine)

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• How to get LSB bit in MIPS?

  - by israkir

  Is there a short way to check/get for least significant bit in a 32-bit integer, in MIPS? It is obviously set for the odd numbers and an algorithm which checks for the whole number is odd or even can decide for this. But I just wonder is there a better way to do this...

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• Is there a "fancy" Ruby way to check whether a local variable is both defined and evaluates to true without using ands and ors?

  - by Steven Xu

  This is quite a quick question. I currently use do_this if (testvar ||= false) Which works just fine. But this approach unnerves me because while fast, it does not short-circuit like defined?(testvar) && testvar does, and it instantiates and assigns a value to a local variable that is subsequently never used, which seems inefficient. I enjoy the very reasonable fact that instance variables are nil before assignment, but I'd like for the situation to be just as easy for local variables.

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