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  • How do database servers decide which order to return rows without any "order by" statements?

    - by Chris
    Kind of a whimsical question, always something I've wondered about and I figure knowing why it does what it does might deepen my understanding a bit. Let's say I do "SELECT TOP 10 * FROM TableName". In short timeframes, the same 10 rows come back, so it doesn't seem random. They weren't the first or last created. In my massive sample size of...one table, it isn't returning the min or max auto-incrementing primary key value. I also figure the problem gets more complex when taking joins into account. My database of choice is MSSQL, but I figure this might be an interesting question regardless of the platform.

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  • MacPorts / Terminal: `Unrecognized action "sudo"`

    - by Chris
    I'm trying to install Image Magick on MAMP. And I'm seriously out of my depth. I've installed MacPorts, and opened the terminal. I've typed in sudo port -v selfupdate per the instructions on http://www.macports.org/install.php#pkg But the response I get from the Terminal is Unrecognized action "sudo" I've googled and googled, but can't find anything that makes a slab of sense. Any clever people feeling generous?

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  • Scala: Simple webservice

    - by Chris
    I'd like to create a simple webservice in scala similar to: http://www.artima.com/lejava/articles/threeminutes.html Is there an easy way to do this? EDIT: I found a tutorial for lift http://wiki.liftweb.net/index.php/HowTo_do_Web_Services. However this seems to be way too complicated for what I'm looking for.

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  • Parse items from text file

    - by chris
    I have a text file that includes data inside {[]} tags. What would be the suggested way to parse that data so I can just use the data inside the tags? Example text file would look like this: 'this is a bunch of text that is not {[really]} useful in any {[way]}. I need to {[get]} some items {[from]} it.' I would like to end up with 'really', 'way', 'get', 'from' in a list. I guess I could use split to do it.. but seems like there might be a better way out there. I have seen a ton parsing libraries, is there one that would be perfect for what I want to do?

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  • Media Disconnected Networking Issue

    - by Chris
    After rearranging my physical network in my apartment my Windows Vista machine can no longer connect to the network. I have tested all of the cabling by connecting other devices and everything is fine. I'm able to connect using other computers, I've even tested a brand new ethernet adapter and the network status still reads "media disconnected". I have no idea where to go from here. My setup is as follows: Cable modem - router - hardwired ethernet cable to computer.

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  • How can I get class, property, and method data from files without executing their code, similar to R

    - by Chris
    I have a bunch of PHP files with classes, in them (although I can't be 100% sure that they won't have code outside of classes in them too), and I need to parse these files to get information about the classes, such as the names of the classes, the methods, the properties, whether they are private/public/static, etc. I looked at PHP's reflection classes and this is very close to what I want but the reflection doesn't seem to use external files and it appears to need to define the classes first. I need to make sure that none of the code is executed and I will be editing the files so I can't guarantee that they will even be error-free. Any suggestions? Thanks.

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  • Using jquery, what is the simplest function to post some json data and process a returned json respo

    - by Chris Boesch
    When users click on an element in my webpage, I would like to call a javascript function that reads the values of a few text boxes on the page, wraps their contents as json where the keys are the ids for the text boxes and the values are the contents of each text box, and then posts the resulting json to a url. I would then like the same function to expect back a json response and call another javascript function with the returned json data. Question: What is the best way to write the javascript function to create a json structure from html elements, post the json with jquery, and call another javascript function with the resulting json response from the server?

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  • Java swing center JDialog over parent

    - by Chris Drappier
    I have a Java swing application with a button that produces a popup window when a certain action is performed. I'd like to align the center point of the popup window with the center point of the parent window when it is rendered. How can I calculate the x,y coordinates to plug into setLocation() for the popup window? EDIT: just to clarify. I do not want the behavior of setLocationRelativeTo() because that sets the top-left pixel of the popup over the center pixel of the parent frame. I want to set the center pixel of the popup over the center pixel of the parent frame. Also, I'm not interested in whether or not a popup window is good practice. I'm past that now. thanks

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  • Prevent "jQuery( html )" from triggering the browser to request images and other referenced content

    - by Chris Dutrow
    Using jQuery to create new DOM elements from text. Example: jQuery('<div><img src="/some_image.gif"></img></div>'); When this statement is executed, it causes the browser to request the file 'some_img.gif' from the server. Is there a way to execute this statement so that the resulting jQuery object can be used from DOM traversal, but not actually cause the browser to hit the server with requests for images and other referenced content? Example: var jquery_elememnts = jQuery('<div><img class="a_class" src="/some_image.gif"></img></div>'); var img_class = jquery_elememnts.find('img').attr('class'); The only idea I have now is to use regex to remove all of the 'src' tags from image elements and other things that will trigger the browser requests before using jQuery to evaluate the HTML. How can jQuery be used to evaluate HTML without triggering the browser to make requests to the server for referenced content inside the evaluated HTML? Thanks!

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  • Why Create Mock Objects?

    - by Chris
    During a recent interview I was asked why one would want to create mock objects. My answer went something like, "Take a database--if you're writing test code, you may not want that test hooked up live to the production database where actual operations will be performed." Judging by response, my answer clearly was not what the interviewer was looking for. What's a better answer?

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  • Script Doesnt Run All the Way Through

    - by Chris
    I have a php script that should execute 2 for loops. Both take awhile to run. I have called ignore_user_abort(true) and set_time_limit(0). The interesting thing is, the first for loop completes, then the script dies without calling the next line of code. ignore_user_abort(true); set_time_limit(0); for($i=0; $i<10500; ++$i) { //do work } mail('[email protected]', 'First loop done', 'None'); for($j=0;$j<12500; ++$j) { //do work } mail('[email protected]', 'Second loop done', 'None'); The first loop will finish after about 20 minutes, but the mail function is never called, the script just ends. Any ideas why this might be happening other than a timeout (I have run other scripts for days on my current configuration)?

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  • Find closest number in range?

    - by Chris
    What is the best way to find the closes value in a range... for example i have an array with 0, 90, 180, 270, 360.. And a number 46... What is the best way to find 90 in the array? (in actipnscript 3)

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  • CoffeeScript 2 Dimensional Array Usage

    - by Chris
    I feel like I'm missing something with CoffeeScript and 2 dimensional arrays. I'm simply attempting to make a grid of spaces (think checkers). After some searching and a discovery with the arrays.map function, I came up with this: @spaces = [0...20].map (x)-> [0...20].map (y) -> new Elements.Space() And this seems to work great, I have a nice 2 dimensional array with my Space object created in each. But now I want to send the created space constructor the x,y location. Because I'm two layers deep, I lost the x variable when I entered the map function for y. Ideally I would want to do something like: @spaces = [0...20].map (x)-> [0...20].map (y) -> new Elements.Space(x, y) or something that feels more natural to me like: for row in rows for column in row @spaces[row][column] = new Elements.Space(row, column) I'm really open to any better way of doing this. I know how I would do it in standard JavaScript, but really would like to learn how to do it in CoffeeScript.

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  • Using regex to strip out certain data from HTML code via PHP

    - by Chris
    I have the following HTML snippet <tr> <td class="1">...</td> <td class="2">...</td> <td class="3">...</td> <td class="4">...</td> </tr> etc... I basically have N rows, and each row contains 4 TD's each with a unique class. I would like a simple way to split out all the rows and TD's by class so I can choose what data I want to use. I expect the easiest way to achieve this would be regex (maybe two). One to split up the TR's then another to split up the TDs (by class preferably) Thanks

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  • php exec and shell_exec not working

    - by chris
    I want to run an exe file on my server and return the output to the browser screen. The exe file takes a input file and then returns data on the screen. Why is this code not working? $output = shell_exec('myprogram < INP.DAT'); echo "<pre>" . var_export($output, TRUE) ."</pre>\\n"; It displays "NULL" on the browser screen. I have also tried exec(). There it returns "Array()".

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  • Objective-c when to release objects

    - by Chris
    -(IBAction)registerUpdate:(id)sender { HTTPRequest* request = [[HTTPRequest alloc] initWithUrl:@"http://www.yahoo.com" delegate:self]; [request doRequest]; } The HTTPRequest makes an asynchronous request and calls the onHTTPResponse method in the current class. My question is do I have to release request? My guess is that I'm supposed to make it an instance variable? [NSString stringWithFormat:@"Data received: %@", [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding]]; How would I release that string object, or should I assign it to a variable?

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  • Persistent Hashing of Strings in Python

    - by Chris S
    How would you convert an arbitrary string into a unique integer, which would be the same across Python sessions and platforms? For example hash('my string') wouldn't work because a different value is returned for each Python session and platform.

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  • What makes C faster than Python?

    - by Chris
    I know this is probably a very obvious answer and that I'm exposing myself to less-than-helpful snarky comments, but I don't know the answer so here goes. If Python compiles to bytecode at runtime, is it just that initial compiling step that takes longer? If that's the case wouldn't that just be a small upfront cost in the code (ie if the code is running over a long period of time, do the differences between C and python diminish?)

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  • Why do I need the isset() function in php?

    - by Chris
    I am trying to understand the difference between this: if (isset($_POST['Submit'])) { //do something } and if ($_POST['Submit']) { //do something } It seems to me that if the $_POST['Submit'] variable is true, then it is set. Why would I need the isset() function in this case?

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  • SQL Server 2008, Books Online, and old documentation...

    - by Chris J
    [I have no idea if stackoverflow really is right right place for this, but don't know how many devs on here run into msi issues with SQL Server; suggest SuperUser or ServerFault if folk think it's better on either of those] About a year ago, when we were looking at moving our codebase forward and migrating to SQL Server 2008, I pulled down a copy of Books Online from the MSDN. Reviewed, did background research, fed results upstream, grabbed Express and tinkered with that. Then we got the nod to move forward (hurrah!) this past couple of weeks. So armed with Developer Edition, and running through the install, I've since found out I've zapped the Books Online MSI, no-ones got a copy of it, and Microsoft only have a later version (Oct 2009) available, so damned if I can update my SQL Server fully and properly... {mutter grumble}. Does anyone know if old versions of Books Online are available for download anywhere? Poking around the Microsoft download centre can't find it, neither is my google-fu finding it. For reference, I'm looking for SQLServer2008_BOL_August2008_ENU.msi ... This may just be a case of good ol' manual delete the files and (try) and clean up the registry :-(

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