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  • Are Triggers Based On Queries Atomic?

    - by David
    I have a table that has a Sequence number. This sequence number will change and referencing the auto number will not work. I fear that the values of the trigger will collide. If two transactions read at the same time. I have ran simulated tests on 3 connections @ ~1 million records each and no collisions. CREATE TABLE `aut` ( `au_id` int(10) NOT NULL AUTO_INCREMENT, `au_control` int(10) DEFAULT NULL, `au_name` varchar(50) DEFAULT NULL, `did` int(10) DEFAULT NULL, PRIMARY KEY (`au_id`), KEY `Did` (`did`) ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=latin1 TRIGGER `binc_control` BEFORE INSERT ON `aut` FOR EACH ROW BEGIN SET NEW.AU_CONTROL = (SELECT COUNT(*)+1 FROM aut WHERE did = NEW.did); END;

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  • C# Passing objects and list of objects by reference

    - by David Liddle
    I have a delegate that modifies an object. I pass an object to the delegate from a calling method, however the calling method does not pickup these changes. The same code works if I pass a List as the object. I thought all objects were passed by reference so any modifications would be reflected in the calling method? I can modify my code to pass a ref object to the delegate but am wondering why this is necessary? public class Binder { protected delegate int MyBinder<T>(object reader, T myObject); public void BindIt<T>(object reader, T myObject) { //m_binders is a hashtable of binder objects MyBinder<T> binder = m_binders["test"] as MyBinder<T>; int i = binder(reader, myObject); } } public class MyObjectBinder { public MyObjectBinder() { m_delegates["test"] = new MyBinder<MyObject>(BindMyObject); } private int BindMyObject(object reader, MyObject obj) { //make changes to obj in here } } ///calling method in some other class public void CallingMethod() { MyObject obj = new MyObject(); MyBinder binder = new MyBinder(); binder.BindIt(myReader, obj); //don't worry about myReader //obj should show reflected changes }

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  • jQuery slider - set background color to show desired range

    - by David
    Howdy, I'm setting up a Filament Group jQuery UI slider and using it in a gradebook. We need to allow teachers to set a desired background range (to show the desirable values vs. the actual value for a given grade). I'm hoping to set a shaded area (as shown in this picture) that would indicate to people viewing the slider which values are desirable. If the handle is within the desired ranges, then the value is satisfactory. If the handle is out of the background shaded range, then some changes may need to happen. Any suggestions on how to accomplish this? Based on what I've experimented with using Firebug, it looks like a <div class="ui-slider"> is setup, but the values inside of it don't seem to allow setting background-colors (only the div allows for that). Thanks for your help.

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  • What should I put in the href when I prototype?

    - by David
    When protyping we often do empty anchors. A very common way to do this is to do something like: <a href="#">Go here</a> But if the client clicks this link, the page will scroll to the top. But if we leave out the href attribute, the link won't behave like a link. I've see stuff like: <a href="javascript;">Go here</a> But it doesn't look right. Any other ideas?

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  • How facebook extracts the right thumbnail of a link?

    - by David
    Hi, I'm wondering how facebook extracts the right picture of the article from a link? they ignore any icons, ads images, or other not related images, & they gives you the right image? What technique/method they use? because i've tried to extract all images using a php regex but how to find the right one? Thanks

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  • division problems

    - by David
    This line of code: System.out.println ("aray[j], "+aray[j]+", divided by sum, "+sum+", equals: aray[j]/sum: "+ aray[j]/sum) ; is yeilding this line of text: aray[j], 21, divided by sum, 100, equals: aray[j]/sum: 0 why is it doing this? (everything is right eccept that the answer should be .21)

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  • (php) regexto remove comments but ignore occurances within strings

    - by David
    Hi there, I am writing a comment-stripper and trying to accommodate for all needs here. I have the below stack of code which removes pretty much all comments, but it actually goes too far. A lot of time was spent trying and testing and researching the regex patterns to match, but I don't claim that they are the best at each. My problem is that I also have situation where I have 'PHP comments' (that aren't really comments' in standard code, or even in PHP strings, that I don't actually want to have removed. Example: <?php $Var = "Blah blah //this must not comment"; // this must comment. ?> What ends up happening is that it strips out religiously, which is fine, but it leaves certain problems: <?php $Var = "Blah blah ?> Also: will also cause problems, as the comment removes the rest of the line, including the ending ? See the problem? So this is what I need... Comment characters within '' or "" need to be ignored PHP Comments on the same line, that use double-slashes, should remove perhaps only the comment itself, or should remove the entire php codeblock. Here's the patterns I use at the moment, feel free to tell me if there's improvement I can make in my existing patterns? :) $CompressedData = $OriginalData; $CompressedData = preg_replace('!/\*.*?\*/!s', '', $CompressedData); // removes /* comments */ $CompressedData = preg_replace('!//.*?\n!', '', $CompressedData); // removes //comments $CompressedData = preg_replace('!#.*?\n!', '', $CompressedData); // removes # comments $CompressedData = preg_replace('/<!--(.*?)-->/', '', $CompressedData); // removes HTML comments Any help that you can give me would be greatly appreciated! :)

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  • populating a gridview with a button's click event

    - by david padi
    hi I have a page that has two dropdownlists(one for the locations, and the other for departments), an employee search textbox and a button. On the other page, I have a gridview. Now, what i want to archieve is that when a user types an employee's name in the textbox control, selects a location from the location dropdownlist, and a department from the departments dropdownlist, and click the button(search), the gridview on the other page must show the reqiured information of a SINGLE employee. Only one row must show. I have created a database for the employees. I know how to do this with the autopostback but i have not tried it using a button's click. NB: the gridview should show only one row of a selected employee. I'm using ASP.NET VB Your help will high apprecaited.

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  • iPhone SDK File Handler with iOS 4 Background Processes

    - by David Higgins
    The "application:applicationDidFinishLaunchingWithOptions:" message does not get called when an application is sitting in the background in iOS 4, and I'm trying to figure out how to be notified when the application is brought back into the foreground by another application. My application registers itself as a handler for certain file types, and Safari and other supported applications allow passing the files over to my app. This works great if the app is closed before I try to use it, but fails otherwise. In my application:applicationDidFinishLaunchingWithOptions: I have: NSURL *url = (NSURL *)[launchOptions valueForKey:UIApplicationLaunchOptionsURLKey]; if([url isFileURL]) { } [self.window makeKeyAndVisible]; return YES; As stated already, this works great so far for starting the app when it's not sitting in the background - but when I switch back over to Safari or Mail and try to open a new file that is supported, my application wakes up from the background and becomes active again but I can't see any "withOptions" overrides for application:applicationWillEnterForeground: or any way to identify what was passed in when it enters the foreground. What would be the appropriate way to receive these "open file notifications" when the application is in the background?

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  • Continue Drupal processing after page send.

    - by David
    I need to do some additional processing after a Drupal page has been sent. I know I could fire a background shell command, but I need the current Drupal execution context to be maintained. I've spent a lot of time looking, but I can't find any documentation in this regard. This is surprising because it must surely be a common requirement. The only real idea I have is to fire up Drupal (again) via a shell command (exec, etc) and supply it with a pseudo path which would invoke the continued processing. But this seems unnecessarily complex/wasteful. Any pointers greatly appreciated, tks.

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  • iPhone App Store Screenshot Order

    - by David L
    In iTunes Connect, the first screenshot (on left) is not showing up as the first screenshot in the App Store. In one case the 3rd screenshot in iTunes Connect shows up 1st on the App Store and in another case the 4th screenshot is 1st on the App Store. Does anyone know how to specify the order of images? I found this question, that says the 1st screenshot in iTunes Connect should be 1st on the App Store, but that is not the case for my 2 apps. iTunes connect screenshot order

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  • How to assemble a WAV file, C# preferred?!

    - by David
    Hi guys! I'm doing an educational project in which 1) I record voice commands on a separate device and after appropriate processing etc... 2) I send 16-bit samples encapsulated in UDP packets over Ethernet to the PC. After receiving the packets and "extracting" data (samples) from them, I need to assemble the samples to a WAV file. Any example code? Any suggestions? Thank you in advance!

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  • syntax problem crating a method that returns an object (java)

    - by David
    I'm trying to create a method that will sum two timeO objects and return a new TimeO object called sum. Here is the relevant code snippet: public static TimeO add (TimeO t1, TimeO t2) { TimeO sum = new TimeO ; ... } When i try to compile it i get this error message: TimeO.java:15: '(' or '[' expected TimeO sum = new TimeO ; ^ 1 error i cant think of any reason why it would want me to open a set of parenthasies or brackets here but its possible that i dont' quite understand the syntax. Whats going wrong here?

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  • correct function parameters designation

    - by david
    Every time i pass some parameters to a JavasScript or jQuery functon, i use some random letters. What are the correct letters for the corresponding variable types? function(o){} for example is for a object. But what are the other letters? Do someone have a list of those?

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  • How do I cache jQuery selections?

    - by David
    I need to cache about 100 different selections for animating. The following is sample code. Is there a syntax problem in the second sample? If this isn't the way to cache selections, it's certainly the most popular on the interwebs. So, what am I missing? note: p in the $.path.bezier(p) below is a correctly declared object passed to jQuery.path.bezier (awesome animation library, by the way) This works $(document).ready(function() { animate1(); animate2(); }) function animate1() { $('#image1').animate({ path: new $.path.bezier(p) }, 3000); setTimeout("animate1()", 3000); } function animate2() { $('#image2').animate({ path: new $.path.bezier(p) }, 3000); setTimeout("animate2()", 3000); } This doesn't work var $one = $('#image1'); //problem with syntax here?? var $two = $('#image2'); $(document).ready(function() { animate1(); animate2(); }) function animate1() { $one.animate({ path: new $.path.bezier(p) }, 3000); setTimeout("animate1()", 3000); } function animate2() { $two.animate({ path: new $.path.bezier(p) }, 3000); setTimeout("animate2()", 3000); }

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  • Ruby on Rails Problem PotionStore

    - by David Schiefer
    Hello, I am trying to install the PotionStore on my Mac OS X 10.6 server with Ruby on Rails 3 installed. Upon launching the server on port 3000 and pointing safari to this address, I get this: NameError in Store/orderController#index uninitialized constant ActiveRecord::ConnectionAdapters::PostgreSQLAdapter::PGconn What does this mean? I'm not too advanced with Ruby on Rails, so this throws me a bit.

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  • I cannot change the target .NET Framework in IIS 6

    - by David Pike
    The option to target another version of the .Net Framework is disabled on a particular test system we are using on a current project. I have tried the following without success: Killing all W3WP.EXE processesRestarting the IIS serviceRemote Debugging has been removed from the box. Just hoping for some pointers.

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  • VSS causing crash in VS 2008

    - by David
    We use Visual Studio 2008, with visual source safe v8. Lately, I seem to be getting a lot more crashes than usual, mainly when viewing history (comparing, etc.). I have taken a screencapture of the series of dialog boxes that will always appear, leading up to the crash: http://img529.imageshack.us/img529/1360/msvscrash.jpg Does anyone know what could be causing this? Thanks.

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