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• Working with sets of rows in (My)SQL and comparing values

  - by Pep.

  Hello, I am trying to figure out the SQL for doing some relatively simple operations on sets of records in a table but I am stuck. Consider a table with multiple rows per item, all identified by a common key. For example: serial model color XX1 A blue XX2 A blue XX3 A green XX5 B red XX6 B blue XX1 B blue What I would for example want to do is: Assuming that all model A rows must have the same color, find the rows which dont. (for example, XX3 is green). Assuming that a given serial number can only point to a single type of model, find out the rows which that does not occur (for example XX1 points both to A and B) These are all simple logically things to do. To abstract it, I want to know how to group things by using a single key (or combination of keys) and then compare the values of those records. Should I use a join on the same table? should i use some sort of array or similar? thanks for your help

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• [C++] Needed: A simple C++ container (stack, linked list) that is thread-safe for writing

  - by conradlee

  I am writing a multi-threaded program using OpenMP in C++. At one point my program forks into many threads, each of which need to add "jobs" to some container that keeps track of all added jobs. Each job can just be a pointer to some object. Basically, I just need the add pointers to some container from several threads at the same time. Is there a simple solution that performs well? After some googling, I found that STL containers are not thread-safe. Some stackoverflow threads address this question, but none form a consensus on a simple solution.

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• PHP echo in Javascript

  - by DonCroce

  I have this code: document.getElementById('root').style.left = '<?php echo $page_position[$info["os"]][$info["browser"]][0]; ?>'; document.getElementById('root').style.top = '<?php echo $page_position[$info["os"]][$info["browser"]][1]; ?>'; Why won't this work like this? Can anybody point me in the right direction? EDIT: <?php echo $page_position[$info["os"]][$info["browser"]][1]; ?> echoed "top:300px;" Sorry guys, very stupid error of mine :/

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• Is there a way to get the current UIEvent being handled?

  - by not-

  I'm working in a class that is a delegate of another class; this other class is in a third-party library that I'd like to avoid changing if at all possible. The original class is handling a -touchesEnded event, and is delegating responsibility to me, but it doesn't pass the UIEvent itself to me. Is there a way to get a handle to the current event in progress? It's a double-tap handler, and all that is passed to me is the view being touched, and the point at which the touch occurred. I want to know exactly how many touches are involved in the event. Thanks! randy

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• Best Practice for loading non-existent data

  - by Aizotu

  I'm trying to build a table in MS SQL 2008, loaded with roughly 50,000 rows of data. Right now I'm doing something like: Create Table MyCustomData ( ColumnKey Int Null, Column1 NVarChar(100) Null, Column2 NVarChar(100) Null Primary Key Clustered ( ColumnKey ASC ) WITH ( PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON ) ) CREATE INDEX IDX_COLUMN1 ON MyCustomData([COLUMN1]) CREATE INDEX IDX_COLUMN2 ON MyCustomData([COLUMN2]) DECLARE @MyCount Int SET @MyCount = 0 WHILE @MyCount < 50000 BEGIN INSERT INTO MyCustomData (ColumnKey, Column1, Column2) Select @MyCount + 1, 'Custom Data 1', 'Custom Data 2' Set @MyCount = @MyCount + 1 END My problem is that this is crazy slow. I thought at one point I could create a Select Statement to build my custom data and use that as the datasource for my Insert Into statement. i.e. something like INSERT INTO MyCustomData (ColumnKey, Column1, Column2) From (Select Top 50000 Row_Count(), 'Custom Data 1', 'Custom Data 2') I know this doesn't work, but its the only thing I can show that seems to provide an example of what I'm after. Any suggestions would be greatly appriciated.

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• multi directional scrolling site

  - by user557318

  Ive been asked if i am able to program a multi directional scrolling site like this- COS only using wordpress. Initially i thought i may be flash but the source seems like it could be simple, possibly with elements of jquery. . . . . I am unable to find any themes that even come close to it. And initially i wanted to know how it has been achieved to see if i am able to start the design work any ideas how this has been achieved. More to the point if the multi scrolling could be applied on wordpress

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• Should an edit of a comment be sent through POST or PUT?

  - by the_drow

  I have the following URI: Posts/{postId}/Comments/{commentId} I would like to enable users to edit a comment through my API, should the edit be done with POST or PUT? One one hand, POST updates the contents of a resource so that makes sense but on the other hand PUT replaces it with a new one. So if I understand correctly with POST I need to send only what needs to be updates and with PUT I send the whole resource. Usually in edit forms, the whole resource is loaded anyway so what's the point of using POST? If I take one approach or the other, what are the differences?

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• Where is the 'indeterminate type'?

  - by Daniel

  I'm defining the following type extension: type System.Reflection.MemberInfo with member x.GetAttribute<'T when 'T :> Attribute>(required, inherit') = match required, Attribute.GetCustomAttribute(x, typeof<'T>, inherit') with | true, null -> invalidOp (sprintf "Missing required attribute: %s" typeof<'T>.FullName) | _, attr -> attr :> 'T The last match expression (attr :> 'T) gives the error: The static coercion from Attribute to 'T involves an indeterminate type based on information prior to this program point. Static coercions are not allowed on some types. Further type annotations are needed. I've tried annotating the function return type, but got the same result. I would hate to change this to a dynamic cast. Is there a way to make the static cast work?

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• UITextField in UITableViewCell Help

  - by W Dyson

  Hello All, I have scoured the internet looking for a good tutorial or posting about having a UITableView populated with a UITextField in each cell for data entry. I want to keep track of each UITextField and the text written within it while scrolling. The tableView will be sectioned. I have been using a custom UITableViewCell but I'm open to any method. Also, is it possible to use the textFields as ivars? If any of you could point me in the right direction, it would be greatly appreciated. Thank you in advance!

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• How does a youtube embed suppress the buffering of a video file?

  - by usingtechnology

  When a youtube video is displayed within an external site, a poster image is displayed but the actual video is not loaded until the user clicks the play button. At that point, the video file begins to buffer and the video plays. This seems to be different than many sites, where a flash video is embedded and the video begins to buffer automatically in the background on page load, regardless of whether the video is set to autoplay or not. How would you set up a flash video (non-youtube) to have the same behavior as youtube, where buffering does not occur at pageload? Is it an output setting that is selected during the flash video rendering process, or is it accomplished using a different method?

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• bash screen title usage (screen -t "something")

  - by atrioom

  I was working with screen lately and wanted to use the -t option for it. What's the point of the-t option if the title of the screen does not show anywhere like when using -list or within the screen when it's attached? There is a command CTRL-A double-quote(") to see all active screens, and then it shows the title, but that does not really do the job, because I have to have the screen attached already. I want to read out the title BEFORE attaching any screens, to attach the right one in the first place. Is there a method to use -t in a convenient way? Edit: There is one method: "ctrl-a "" and then "ctrl-a {numberofscreen}". I guess that's the best way to use the screen titles?

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• Organizing c# code into different files

  - by Adam S

  Hi everyone. I've gotten to a point where my main code file is about a thousand lines long and it's getting un-manageable; that is, I'm starting to get confused and not know where to locate some things. It's well-commented but there's just too much stuff. I'd really like to be able to organize my code into different files, each with its own purpose. I want to get all the help VS gives me as I type when I edit these other files. A picture can say a thousand words: Is what I'm trying to do even possible?

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• having problems using Zend_Db_Table_Abstract::createRow()

  - by Gootik

  Hey, I have built a model that extends Zend_Db_Table_Abstract and I can't figure out why I can't use createRow(); here is my code: class Model_User extends Zend_Db_Table_Abstract { public function createUser() { $row = $this->createRow(); $row->name = 'test'; $row->save(); } } and in a controller I use: $userModel = new Model_User(); $userModel->createUser(); which when run displays an error An error occurred Application error here is my setup in application.ini resources.db.adapter = "pdo_mysql" resources.db.params.host = "localhost" resources.db.params.username = "root" resources.db.params.password = "pass" resources.db.params.dbname = "app_db" resources.db.isDefaultTableAdapter = true I am sure that my user/pass/dbname is correct. I would appreciate it if you point me in the right direction.

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• When should I define an hash code function for my types?

  - by devoured elysium

  Is there any other reason for implementing an hash code function for my types other than allowing for good use of hash tables? Let's say I am designing some types that I intend to use internally. I know that types are "internal" to the system, and I also know I will never use those types in hash tables. In spite of this, I decide I will have to redefine the equals() method. Theory says I should also redefine the hash code method, but I can't see any reason why, in this case, I should do it. Can anyone point me out any other reason? This question can be rephrased to : in which situations should we implement a hash code method in our types. PS : I am not asking how to implement one. I am asking when.

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• I just don't get why there is a glMatrixMode in OpenGL

  - by René Nyffenegger

  I just don't understand what OpenGL's glMatrixMode is for. As far as I can see, when glMatrixMode(GL_MODELVIEW) is called, it is followed by glVertex, glTranslate, glRotate and the like, that is, OpenGL commands that place some objects somewhere in the space. On the other hand, if glOrtho or glFrustum or gluProjection is called (ie how the placed objects are rendered), it has a preceeding call of glMatrixMode(GL_PROJECTION). I guess what I have written so far is an assumption on which someone will prove me wrong, but is not the point of using different *Matrix Mode*s exactly because there are different kinds of gl-functions: those concerned with placing objects and those with how the objects are rendered? So, if someone could shed some light on this issue, I'd certainly appreciate it.

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• Can I use breakpoints (as while debugging) while 'unit testing' ?

  - by Richard77

  Hello, I'm walking through the FrontStore series tutorial on TDD in MVC (Part 3 by Rob Conery/ASP.NET). The test I'm concerned with is the CatalogRepository_Each_Category_Contains_5_Products(). Until I get to that test, everything was working fine. Now, I've gone through every line that makes this test (including the test itself, the TestCatalogRepository, ...). I've also compared my code to that of Rob, but the test keeps failing. I also checked the source code from CodePlex, that test was not there. Now, I wonder if I can put a break point somewhere to check the local values as the test is being executed? If not, something similar? Thanks for helping.

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• EntityFramework 4.0: can you return different types depending on data in the database?

  - by user200341

  I have a Media table in the database. I also have an IMedia interface. I have two different media types that implements the same interface: 1) AudioMedia 2) PictureMedia What I wonder here, is if I can use EntityFramework (I'm using an EDMX file but I have my models in a separate library, with automatic code generation turned off), and depending on the data in the database, select what type to get (AutioMedia or PictureMedia). Since they are both implementing the same interface (could be changed to an abstract class if needed I suppose), I'm thinking that somewhere along the way you could specify what class it should be. I should perhaps point out that I have a class that inherits from ObjectContext to access the objects. Perhaps there is something that that can be done?

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• For a user who is not logged into Facebook, the like button gives an error in the pop up window (non

  - by dealsvista

  Hi, In order to make full use the Facebook like button, I am trying to switching from iframe-based like button to js-based like button. url: http://www.dealsvista.com Everything works fine for a user who is logged into Facebook. However, for a user who is not logged into Facebook, when he clicks the like button, there is a error in the popup window. Could someone point me to the right direction? I am really new to Facebook api and have no idea what is going on? Do I have to implement connect at the same time? Do I have to set up the connect call back url in my apps?

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• Are there actually lag times to remove an email address from "the system"? [closed]

  - by Alex Gosselin

  For example, you send an unsubscribe message to a legitimate company or a spam, they reply that they will remove you and it may take up to 72 hours to take effect. I find it hard to believe anything that simple could take more than 3/4 of a second to take effect system wide. Another example would be when you call the visa activation line, there is a "delay" of several minutes while they try to sell you some kind of insurance. Usually just as you get the point across that you don't want it they will tell you your card has been activated and let you go. Are these delays real?

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• Pass off execution to different/specific thread in Java

  - by Mike

  I have about 4 threads. One thread keeps checking some data that the other thread is updating. The others are doing some processing in the background. All have been started at this point. My question is when the checking thread sees that the data has not been updated yet I currently sleep for a little bit but is there any way for me to tell the system to back to executing the thread that does the updating? That or is there any way I can put something like a listener on the data(a String) and once its updated an event will fire that will do what it needs to do? I tried using yield() and it seemed to just keep returning to the thread I called yield() from. Thanks

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• JQuery - How do I count the number of elements selected by a selector?

  - by Josh

  I am using $().fadeOut() to fade items out in a list ( < li < /li). When the list is empty I wish to hide a parent object. I plan on doing this by checking in my trigger event that fades the list if the count of the objects is 0 then hide the parent element. I can use the fadeOut callback to remove the elements if necessary. The to the point question: How do I select li tags inside a ul and then get the total count of them using jquery?

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• Adding interfaces that won't be actually used

  - by devoured elysium

  I currently have two interfaces(that I'll name here IA and IB): interface IA { int Width; int Height; ... } interface IB { int Width; int Height; ... } that share the same two properties: they both have a Width and a Height property. I was thinking if there is any point in defining an IMatrix interface containing a Width and Height properties: interface IMatrix { int Width; int Height; } The thing is that although they share both the same properties, I won't make use of polymorphism with IMatrix in any of my coding: i.e., there won't by any situation where I'll want to use an IMatrix, I'll just want to use IA and IB. Adding an IMatrix seems more like over-engineering than other thing, but I'd like to ask you guys what your opinion is on the matter. Thanks

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• Can the Browser 'Forward' Button be Set from HTML?

  - by John C

  Example: At the bottom of the StackOver Questions page are a bunch of page numbers (1,2,3...), enclosed in a set of prev and next buttons. Clicking next repeatedly will bring me to, say page 5, at which point I will have: The page's prev button will be set to 'http://stackoverflow.com/questions?page=4' The Back button on my Browser will have the same value. The page's next button will be set to 'http://stackoverflow.com/questions?page=6' The Forward button on my Browser - won't be set to anything. Obviously, if I hit the Back button on the Browser, then Forward will have a value, pointing to the URL for page 5 - but not otherwise. Is there any way, from HTML (plus Javascript), to set the value of the Browser's Forward button? Or is this one of those things that HTML is simply forbidden to do?

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• What do I put in my Ruby (JRuby) code to break into the debugger?

  - by Daryl Spitzer

  I'm familiarizing myself with some JRuby code, and I'd like to be able to place a breakpoint in the code and run (as usual) from the command-line, having it break into the debugger when it gets to that point. Is there something I can put in my code to force JRuby to break into the debugger? I've tried running jruby -r debug foo.rb (instead of the usual jruby foo.rb), and then setting a breakpoint with b bar.py:98, and then continuing. But the debugger stops every time there's an exception, and there seem to be a lot of them before it gets to the line of code I'm interested in. I'd like to be able to put the "break-into-debugger" line(s) in my code and run jruby foo.rb and have the first place the debugger stops be at that line. (i.e. I'm looking for the Ruby/JRuby equivalent of import pdb;pdb.set_trace() in Python.)

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• Silverlight client load operation failed for query "Login". [GenericParameterNotValid]

  - by cvoeller

  I have one user who gets the following error when trying to login, "Silverlight client load operation failed for query "Login". [GenericParameterNotValid]". The odd thing is that other users are able to login without issue and I can login using the "problem" account from other machines. At this point I think it's got to be a client side configuration issue. My next step is to confirm the Client Side Silverlight Version, but I don't know where to go after that. Do you have any suggestions?

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