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• What are the repercussions of not checking existing data when adding a foreign key?

  - by scottm

  I've inherited a database that doesn't exactly strive for data integrity. I am trying to add some foreign keys to change that, but there is data in some tables that doesn't fit the constraints. Most likely, the data won't be used again so I want to know what problems I might face by leaving it there. The other option I see is to move it into some kind of table without referential constraints, just for historical purposes. So, what are the repercussions of not checking existing data? If I create a foreign key constraint on a table and don't check existing data, will all new data inserted into the table be enforced?

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• Write Local File using Adobe Air Iframe

  - by user290687

  This is driving me mad. I am creating an AIR application and everything is working great. However I would really like to have a form inside an Iframe that when the user clicks submit saves the file to local application storage directory. Right now I am able to do this and save the file with no problems when I just access the HTML page not inside an Iframe. However if I wrap the page in an iframe and hit submit the file does not save. Any code examples would be very much appreciated. When I am using the iframe my code looks as follows<iframe src="jobs/newjob.html" height="800px" width="800px" sandboxRoot="app:/" documentRoot="app:/sandbox"ondominitialize="setupBridge ()">

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• C++ vector of char array

  - by Stuart

  I am trying to write a program that has a vector of char arrays and am have some problems. char test [] = { 'a', 'b', 'c', 'd', 'e' }; vector<char[]> v; v.push_back(test); Sorry this has to be a char array because I need to be able to generate lists of chars as I am trying to get an output something like. a a a b a c a d a e b a b c Can anyone point me in the right direction? Thanks

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• Local Live Quicktime Video Broadcast, latency?

  - by Snowwire

  I'm looking into the feasibility of using a local server to distribute live video of a conference to delegates in the same room. They would still hear the live audio coming from the speaker, so only the video would be streamed. I was considering a Darwin Steaming Server (a lot of iPhone users to support) and encoding with H.264. My main concern is latency across the network. Even with everything running locally, would there be lip sync issues between the live audio and the 'live' video stream? It feels like there will be problems given the encoding, broadcasting, decoding to be completed, but I've never done any like this before so thought I would check. Thanks

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• how to open Gmail View Message Activity?

  - by NickLai

  I want to write an application to List the Gmail message. In the list, if user click one of the message item, it shall link ot Gmail App to see more detial information. Currently I can read the Gmail db with Gmail.java. There are some problems while I want to open Gmail Activity. In general, we can open Activity with Action and parameters. But Gmail App has not release code base. We do not know what Action set to Gmail Activity and what parmeter shall we put the extras. I only know that the Activity of View detial Message is named "HtmlConversationActivity." And the Package is under "com.google.android.gm." please tell me how to open the View detial Message Activity in Gmail APP. thanks a lot.

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• Seam + hibernate + jsf on weblogic

  - by Kiva

  I'm making a little project with Seam, Hibernate and JSF. This project run on JBoss 5.1. My boss wants to deploy this project on WebLogic. I read on the seam documentation that seam and WebLogic don't work fine together. I would like to know if I can use Hibernate (with JPA) and JSF on WebLogic and what framework (struts, spring?) I can use to replace Seam. Edit: I read in the seam documentation (chapter 39, weblogic integration) and I find that: For several releases of Weblogic there has been an issue with how Weblogic generates stubs and compiles EJB's that use variable arguments in their methods. This is confirmed in the Weblogic 9.X and 10.0.MP1 versions. Unfortunately the 10.3 version only partially addresses the issue as detailed below. So, I want to know if other problems like this exist. Edit 2: I use Weblogic 10.3

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• Help regarding no sql databases like hadoop, hbase etc

  - by user560370

  I am new to the distributed NoSQL databases like Hadoop, Cassandra, etc. I have few questions for which I seek an expert advice: Can you list problems/challenges one will generally face when making a shift from the present conventional database like MySQL to these large cluster-based databases? What are the difficulties, if any, when one needs to adapt to a newer version of these open source projects? Can you list out the things which are generally stored/kept in memcached for fast rendering of the page? How can I understand the source code of open-source projects so that I can build on it and maybe give back to the community? Above questions may sound to be idiotic and basic but please it's a request for the experts to answer the above questions in detailed and to best of their abilities.

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• Error #2126: NetConnection object must be connected

  - by Shuo

  Hey guys , I want to count the online user,when each client login the system,it's connecting to the server and increase a variable stored in a remote shared object. But when client connecting server,problems arises:Error #2126: NetConnection object must be connected My web layout: Website --- apps --- userLogin Code snippets: rtmpnc = new NetConnection(); rtmpnc.objectEncoding = ObjectEncoding.AMF0; var uri:String = ServerConfig.getChannel("my-rtmp").endpoint + "/userLogin"; rtmpnc.connect("http://202.206.249.193:2367/userLogin"); rtmpnc.addEventListener(NetStatusEvent.NET_STATUS,onNetStatusHandler); The onNetStatusHander is defined as : switch(event.info.code) { case "NetConnection.Connect.Success":onConnSuccess();break; case "NetConnection.Connect.Failed":onConnError();break; } Could anyoue help me out?Much thanks! Best,Shuo

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• Passenger problem: "no such file to load" -- /config/environment

  - by Mason Jones

  I've been researching this one and found references to similar problems here and there, but none of them has led to a solution yet. I've installed passenger (2.2.11) and nginx (0.7.64) and when I start things up and hit a Rails URL, I get an error page informing me of a load error: no such file to load -- /path/to/app/config/environment From what I've found online this appears to be some sort of a user/permissions error, but I've tried all the logical fixes: I've made sure that /config/environment.rb is not owned by root, but by a webapp user. I've tried setting passenger_default_user, I've tried setting passenger_user_switching off. I've even tried setting the nginx user, though that shouldn't matter much. I've gotten some differing results, but nothing's actually worked. I'm hoping someone may have the magical combination of settings and permissions for this. I may try backing down to an earlier version of Passenger, because I've never had this issue before; it's been a little while since I set up Passenger though. Thanks for any suggestions.

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• Duplicate Method Names - Objective-c

  - by evanchri

  Why does this compile with out any errors or warnings? @interface ObjectTest : NSObject { } -(void)iAmADoubleMethod; -(void)iAmADoubleMethod; @end @implementation ObjectTest -(void)iAmADoubleMethod { NSLog(@"IAmADoubleMethod"); } @end I came across this in a project I am working on. I come from a C++ background, so I figure I would get at least a warning for this. Not only would I like to know why it complies but could this code cause any problems? Thanks.

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• mod_rewrite and relative urls

  - by Davide Gualano

  I'm setting up some simple url rewriting rules using mod_rewrite and a .htacces file, but I've got some problems. If I set up the .htacces this way: Options +FollowSymLinks RewriteEngine On RewriteBase / RewriteRule /index.html /index.php [L] when I call from the browser this url: http://localhost/~dave/mySite/index.html I got a 404 error. Using this .htacces instead Options +FollowSymLinks RewriteEngine On RewriteBase / RewriteRule /index.html http://localhost/~dave/mySite/index.php [L] everything works fine and I get the index.php page I'm expecting. Am I forced to user absolute urls as the target of a rewrite? Is this a Apache configuration problem? I'm using Max OS X 10.6.2 with its standard Apache installation.

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• qapps runs well but breakpoint sometimes generates segmentation fault

  - by yan bellavance

  I have a qApp that generates a segmentation fault only when a breakpoint is inserted in the code (I can put it at different places) and only after 4-5 breakpoint stops. Do I have a problem with my code or is this a DBG bug. the method is part of a QThread Class. Basically what I did is i took the mandlebrot example, and have 3 instances of it in my program. So the program would look like a mainwindow that has 3 mandlebrot widgets in it, one besides the other. Is it possible that GDB doesnt support debugging qthread subclasses that are instantiated multiple times or is it thread-unsafe to do so. I dont have any problems at run-time.

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• Selecting item from set given distribution

  - by JH

  I have a set of X items such as {blower, mower, stove} and each item has a certain percentage of times it should be selected from the overall set {blower=25%,mower=25%,stove=75%} along with a certain distribution that these items should follow (blower should be selected more at the beginning of selection and stove more at the end). We are given a number of objects to be overall selected (ie 100) and a overall time to do this in (say 100 seconds). I was thinking of using a roulette wheel algorithm where the weights on the wheel are affected by the current distribution as a function of the elapsed time (and the allowed duration) so that simple functions could be used to determine the weight. Are there any common approaches to problems like this that anyone is aware of? Currently i have programmed something similar to this in java using functions such as x^2 (with correct normalization for the weights) to ensure that a good distribution occurs. Other suggestions or common practices would be welcome :-)

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• Ways to make your WCF services compatible with non-.NET consumers

  - by Mayo

  I'm working on adding a WCF services layer to my existing .NET application. This layer will be hosted in IIS and will be consumed by a variety of UIs, at least one of which will not use Microsoft technologies. I can make a Web service in WCF that is consumed by my .NET application. However, I'm concerned about things that work in the .NET world but not with other technologies. For example, simply throwing an exception from my WCF service works fine in .NET. But according to this article, one should approach exception handling with fault contracts to ensure compatibility with non-.NET consumers. The author labels this lack of foresight as The Fallacy of the .NET-Only World. Does anyone have any high level suggestions or links to articles that cover interoperability between WCF and non-.NET consumers? I realize I'm potentially working against the YAGNI principle. I'm only really looking to avoid things that will be incredibly difficult to overcome later when the developers of the non-.NET consumer report problems to me.

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• SQL Server Error 26 (Error Locating Server/Instance Specified) Only When Debugging

  - by Phsion

  I have a simple asp .net web project I'm working on, and while normally everything is going fine, if I try to debug the site, I get "SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified". I'm not sure if its a weird code issue or a weird SQL Server Issue, but here are the system specs anyway. My dev machine is Windows 7 32-bit, and a Windows Server 2008 VM (on the same Windows 7 Machine) runs both IIS and SQL Server 2008 Express. I haven't had any other problems with the connection string I'm using, and I'm using the simple SA account. Anyhow, thanks for the help.

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• How to remove $ from associate array using Json_decode in php?

  - by Chase

  I am trying to use the youtube API to pulldown some videos for my site. Currently am running this code here: //Youtube Videos Pull Down $youtubeURL = "http://gdata.youtube.com/feeds/api/videos?alt=json&q=cats+cradle+chapel+hill&orderby=published&max-results=10&v=2"; $youtubeSearch = file_get_contents($youtubeURL, true); $youtubeArray = json_decode($youtubeSearch, true); Not having any problems accessing certain elements of the associative array however youtube's api is putting $ in many of its array elements .. such as [media$group] Anytime I try to access an array with one of the $ elements in it, it doesn't work. Suggestions? I have tried preg_replace but can't seem to get my expression right.

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• Compiling error with API 10

  - by Suhel De Corser

  I was following the basic tutorials on developers.android.com and came by creating the activity named DisplayMessageActivity. It is a blank activity with all the specifications given as shown in the tutorial. FYI, I am using Min SDK = API 8, Target SDK = API 16, Compile with = API 10 The next thing is that there are two errors: "The method getActionBar() is undefined for the type DisplayMessageActivity "home cannot be resolved or is not a field" I tried changing the API to 14 which called for another problem, it wants the minimum API to be 11. That solves these problems, but the main problem is so many devices still use Gingerbread or maybe FroYo. Can't I write for them? Do I have to go higher? How to write for them?

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• What's wrong with consuming ConfiguredTaskAwaitable from PortableClassLibrary's class under Debugger from MSTest Runner or Console App?

  - by Stas Shusha

  *Its only Debug-time error, but a very weird one. Problem: While running with Debugger attached and calling a method, exposed in separate Portable library, returning ConfiguredTaskAwaitable, we get InvalidProgramException. Repro: Having 2 projects: PortableClassLibrary (supporting .Net 4.5; Windows Store; Windows Phone 8) with 1 class: public class Weird { public static ConfiguredTaskAwaitable GetConfiguredTaskAwaitable() { return new ConfiguredTaskAwaitable(); } } ConsoleApplication with code: static void Main(string[] args) { Weird.GetConfiguredTaskAwaitable(); } Notes: replacing ConfiguredTaskAwaitable with ConfiguredTaskAwaitable<T> (a generic version) fixes this strange issue consuming this method form WP8 or Win8 app under Debugger works fine. Currently it causes problems cause I cant run my Unit Tests under Debugger. I'm forced to change my "ObjectUnderTest" implementation to return generic ConfiguredTaskAwaitable<T>, which is fine for the real project, but still is only a workaround. The Question is: does anybody knows the reason of this error? It definitely related to Portable Class Library magic.

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• Is it ok to store large objects (java component for example) in an Application variable?

  - by DustMason

  I am developing an app right now which creates and stores a connection to a local XMPP server in the Application scope. The connection methods are stored in a cfc that makes sure the Application.XMPPConnection is connected and authorized each time it is used, and makes use of the connection to send live events to users. As far as I can tell, this is working fine. BUT it hasn't been tested under any kind of stress. My question is: Will this set up cause problems later on? I only ask because I can't find evidence of other people using Application variables in this way. If I weren't using railo I would be using CF's event gateway instead to accomplish the same task.

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• "No row with the given identifier exists" although it DOES exist!

  - by roesslerj

  Hello all! I am using Hibernate and getting Exception in thread "main" org.hibernate.ObjectNotFoundException: No row with the given identifier exists: [<MyDbObject>#271] What is pretty weird about this error is, that the object with the given id exists in the database. I inserted the problematic record in another run of the application. If I access it in the same run (i.e. same hibernate session) there seem to be no problems retrieving the data. Just because it could be a fault of the mapping: public class ProblemClass { @ManyToOne(optional = false) private MyDbObject myDbObject; } public class MyDbObject { @OneToMany(mappedBy = "myDbObject") private List<ProblemClass> problemClasses; } I have absolutely no clue even where to look at. Any hints highly appreciated!

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• How to combine several movieclips into one scene?

  - by NKelly

  Hi everyone, I'm creating a website that allows kids to designs a tshirt. I will have four section, colour, graphic, text and print. I have created these sections on demos and they are all working. I now need to properly create them all on one movie clip. I'm having problems with it, when i select the chosen tshirt colour and move onto the graphic section the shirt is white again and hasnt came through blue. Its the same for every section, when I select a grahic they dont come through either etc when I click the next button it refreshs the page. Does anyone know how to create this kind of design on one movie clip using different frames and so that the colour etc transfers onto each new page? PLEASE HELP!!!

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• Is it still too early to hop aboard the Python 3 train?

  - by Znarkus

  I'm still a beginner to Python, so I thought I could as well learn the newest iteration of Python. Especially since it is now 3.1 or 3.2 something. But it seems like many mayor modules are still only supported by 2.6. Like the python-mysql module; from what I read on http://mysql-python.blogspot.com/ it seems like 3.x support won't be seen in any near future. Do you use version 3, how do you get around these problems? Should I retreat to 2.6? If not, what should I use to connect to MySQL?

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• practicing C over the summer

  - by Jefferson Shawn

  Hi, I'm a student with a bit of experience in Java and C++ (one semester each) Currently, I'm going through K&R and working on the exercises in the book. However, I was thinking of what I could work on over the summer since I'm almost done with K&R and I will have a lot of free time soon. I really like building command line applications so I was thinking of getting involved with the coreutils project somehow. My question is, is it too early for me to be messing with coreutils? Should I be working on something a bit simpler perhaps? I'm a bit new with the Linux/Open source world if that matters but I'm really enjoying it. I've done some project euler problems and I don't really like it that much.

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• Singletons vs. Application Context in Android?

  - by mschonaker

  Recalling this post enumerating several problems of using singletons and having seen several examples of Android applications using singleton pattern, I wonder if it's a good idea to use Singletons instead of single instances shared through global application state (subclassing android.os.Application and obtaining it through context.getApplication()). What advantages/drawbacks would have both mechanisms? To be honest, I expect the same answer in this post http://stackoverflow.com/questions/2709071/singleton-pattern-with-web-application-not-a-good-idea but applied to Android. Am I correct? What's different in DalvikVM otherwise? EDIT: I would like to have opinions on several aspects involved: Synchronization Reusability Testing Thanks in advance.

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• What's the deal with rubygems on Debian? It's different and strange.

  - by JSW

  I've noticed at least the following oddities around rubygems on Debian (5.0 lenny in my case): Packages go into a different installation location: /var/lib/gems vs /usr/lib/ruby/gems The debian package is rubygems 1.3.6, and updating rubygems to the latest version (1.3.7) doesn't work: $ sudo gem update --system ERROR: While executing gem ... (RuntimeError) gem update --system is disabled on Debian. RubyGems can be updated using the official Debian repositories by aptitude or apt-get. Not all gems appear to work like they do on other systems. For instance, when installing Phusion Passenger, it did not detect the "rack" gem even though it was definitely installed. Manually installing rubygems using the source tarball and reinstalling all my gems (to /usr/lib/ruby/gems) made my problems go away. What's the deal? Why is debian's package different?

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