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  • Is it possible to generate plain-old XML using Haml?

    - by lsdr
    I've been working on a piece of software where I need to generate a custom XML file to send back to a client application. The current solutions on Ruby/Rails world for generating XML files are slow, at best. Using builder or event Nokogiri, while have a nice syntax and are maintainable solutions, they consume too much time and processing. I definetly could go to ERB, which provides a good speed at the expense of building the whole XML by hand. HAML is a great tool, have a nice and straight-forward syntax and is fairly fast. But I'm struggling to build pure XML files using it. Which makes me wonder, is it possible at all? Does any one have some pointers to some code or docs showing how to do this, build a full, valid XML from HAML?

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  • NoSQL for concurrent reads/writes

    - by Mickael Marrache
    After getting some performance issues for an application using a MySQL database, I'm thinking of using NoSQL solutions. My architecture is as follows: One application receives messages from the network at a high throughput (i.e. 50000 messages/sec). Each message is stored in the DB, so it's important for the write rate to be as fast as the arrival rate. Then, I also have some PHP pages that accesses the DB to get the data stored by the other application. It's important for me that the retrieved data is as relevant as possible (i.e. not old data, let's say not more than 5 seconds old). Also, the data is not critical, so I don't need any security mechanism to avoid losing the data. I see there are a lot of NoSQL solutions, but I don't know if they are all relevant. Could you please provide me some directions. Thanks

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  • Picking the right language

    - by simion
    I am a student at University so my experience is limited, hence the question. If someone says to you, here is a task to code, what are you looking at in order to choose the language or paradigm in which you will do it in? Hope the question makes sense?

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  • Cannot convert lamda expression

    - by Kirsty White
    If I try: Groups = students.Remove(f => f.StudentID.Equals(studentID)); I get an error on this line: f => f.StudentID.Equals(studentID) I am having difficulty from my previous posts here linq deleted users still associated with groups and here Delete method in WCF So I thought maybe I could delete the students contained within groups but I get an error Cannot convert lamda expression to type Student because it is not a delegate type.

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  • what's the best way to learn C++ and Qt at the same time?

    - by Daniel Hill
    Hi I did A Google search and couldn't find anything, so I wanna learn Qt/C++ my University (I'm a first year CompSci Student) won't be teaching C++ next year which is a big disappointment I already know Python and dabbled in LaTeX, Javascript, C++ I'm currently helping out a free software project Clementine but it's programmed in Qt/C++ and I don't know enough of both to help out enough. Is there any tips, Tutorial, howtos out there?

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  • Write to text file using ArrayList

    - by Ugochukwutubelum Chiemenam
    The program is basically about reading from a text file, storing the current data into an ArrayList, then writing data (from user input) into the same text file. Kindly let me know where I am going wrong in this sub-part? The data inside the text file is as follows: abc t1 1900 xyz t2 1700 The compiler is showing an error at the line output.format("%s%s%s%n", public class justTesting { private Scanner input; private Formatter output; private ArrayList<Student> tk = new ArrayList<Student>(); public static void main(String[] args) { justTesting app = new justTesting(); app.create(); app.writeToFile(); } public void create() { Text entry = new Text(); Scanner input = new Scanner(System.in); System.out.printf("%s\n", "Please enter your name, ID, and year: "); while (input.hasNext()) { try { entry.setName(input.next()); entry.setTelNumber(input.next()); entry.setDOB(input.next()); for (int i = 0; i < tk.size(); i++) { output.format("%s%s%s%n", tk.get(i).getName(), tk.get(i) .getTelNumber(), tk.get(i).getDOB()); } } catch (FormatterClosedException fce) { System.err.println("Error writing to file."); return; } catch (NoSuchElementException nsee) { System.err.println("Invalid input. Try again: "); input.nextLine(); } System.out.printf("%s\n", "Please enter your name, ID, and year: "); } } public void writeToFile() { try { output = new Formatter("testing.txt"); } catch (SecurityException se) { System.err .println("You do not have write access permission to this file."); System.exit(1); } catch (FileNotFoundException fnfe) { System.err.println("Error opening or creating file."); System.exit(1); } } }

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  • Read Text File line by line using Command Prompt/Batch

    - by user353305
    Hello All, First of all I am very thankful to the owner of this website. I have learned and implement various technologies with the help of solutions provided by the readers. I know the question I asked is posted many time in this forum. And I have tired all of the solutions available, but no luck I may case I am trying to read a dat file which is basically a msg/feed file having more than 22000 Characters. Every line may or may not be of same length. My requirement is to convert the file to fixed line length character file. I have a logic that work well using vb script, however its pretty slow. I have checked with For f/ but no luck. The only delimiter I have is EOT, which i can see in Textpad but not in notepad. I have tried with \n, token=. Please help me in resolving the issue. Regards, Rajiv [email protected]

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  • What lessons have you learned about using a wiki as a development tool?

    - by Vivek Kodira
    I'd asked a question a while back about ways to encourage my team to collaborate. The tool we use is a wiki. Since this is the first time we are using the wiki (formally and as a team), we are learning by committing mistakes. One of the lessons has been that a wiki isn't suitable for tracking activities. It is better to use a tool built for-the-job (will elaborate if necessary). Are there other such anti-patterns? What development tasks would you NOT recommend using a wiki for (even though it may seem suitable at first glance)? Edit: Making this a community-wiki since it is probably unlikely that there will be 'one' right answer.

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  • Weblogic server lib VS instance libext

    - by Sebastien Lorber
    Hello, I use weblogic 10. Its provide an Oracle JDBC driver 10.2.0.2 (in the server/lib on weblogic home). Actually someone at work put a long time ago a 10.2.0.3 driver in instance libext folder. But in production we got a jdbc driver stack (nullpointer :O) and by reverse engineering it seems we are using driver 10.2.0.2. We know that we could change the driver in the server/lib of weblogic but i want to understand. Isn't libext supposed to override server libs like META-INF libs override libext? By the way we are in a strange situation: - We have 2 EAR, and for the exact same treatment in those 2, one will sometime throw the oracle driver nullpointer while the other doesn't - I wonder if one ear isn't using 10.2.0.2 while the other is using 10.2.0.3 (i saw a bug fixed that could fit to our problem for this version). - I need to look better but at first sight both ear use the exact same datasource set in weblogic JNDI resources Any idea?

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  • Cant get Tomcat6.0 to work with Windows 7 Environment

    - by CitadelCSCadet
    Prior to upgrading to windows 7, I was able to use Tomcat 6.0, but when I upgraded to the new Windows, and downloaded Eclipse EE, and downloaded the apache content, I am unable to get Apache to run. When I attempt to start my apacher server through either system tray, or even windows services, it gives the followign error screen. "Windows could not start the Apache Tomcat 6 on local computer. For more information review the system event log. Refer to server specific error code 0." I have been able to locate some forums about error code 0, and some other documentation on this problem, but none of the solutions seems to work. One of the solutions I came across said to take the msvcr71.dll (mscvrt.dll on new platforms) and put it into the bin folder of apache. This also did not work. Does anybody know a fix for this problem, or a way to get around it so I can get my server up and running thanks.

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  • Is it easier to write filesystem drivers in userspace than in kernel space?

    - by Jack
    I will use the Linux NTFS driver as an example. The Linux kernel NTFS driver only has very limited write support in the kernel, and after 5 years it is still considered experimental. The same development team creates the ntfsmount userspace driver, which has almost perfect write support. Likewise, the NTFS-3G project which is written by a different team also has almost perfect write support. Why has the kernel drive taken so much longer? Is it much harder to develop for? Saying that there already exists a decent userspace application is not a reason why the kernel driver is not compelte. NOTE: Do not migrate this to superuser.com. I want a programing heavy answer, from a programming perspective, not a practical use answer. If the question is not appropriate for SO, please advise me as to why so I can edit it so it is.

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  • Post and get at the same time in php

    - by user225269
    Do you have any suggestions with my problem. I need to use get and post at the same time. Get because I need to output what the user has typed. And post because I need to access the mysql database in relation to that input. It looks something like this: <form name="x" method="get" action="x.php"> <input name="year" type="text"> <select name="general" id="general"> <font size="3"> <option value="YEAR">Year</option> </form> This will output the contents of mysql depending on what the user will check: <form name="y" method="post" action"y.php"> <input name="fname" type="checkbox"> </form> And the form action of those two combined will look something like this: <?php if($_POST['general'] == 'YEAR'){ ?> <?php echo $_GET["year"]; ?> <?php $result2 = mysql_query("SELECT * FROM student WHERE student.YEAR='$syear'"); ?> <table border='1'> <tr> <?php if ( $ShowLastName ) { ?><th>LASTNAME</th><?php } ?> <?php if ( $ShowFirstName ) { ?><th>FIRSTNAME</th><?php } ?> </tr> <?php while ( $row = mysql_fetch_array($result2) ) { if (!$result2) { } ?> <tr> <td><?php echo $row['IDNO']?> </td> <td><?php echo $row['YEAR'] ?> </td> <?php if ( $ShowLastName ) { echo('<td>'.$row['LASTNAME'].'</td>'); } ?></td> <?php if ( $ShowFirstName ) { echo('<td>'.$row['FIRSTNAME'].'</td>'); } ?> I really get lots of undefined errors when I do this. What can you recommend that I should do in order to get the value inputted by the user together with the mysql data.

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  • Writing a windows web service and not sure what language to use?

    - by badpanda
    So I am required to write a fairly basic Windows service and have never done so before. Of C#, C++ (the Visual Studio suite), what is the best language to develop in? I am a student, and am most familiar with OO languages such as Java. Additionally, if anyone can recommend any books, articles, or google searches that would be relevant to the project I would greatly appreciate it. Thanks! badPanda

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  • can you have a java career without a CS degree ?

    - by eclipsepain
    What is the best way to prepare for a java career ? Could you study on your own, make a few open source projects or work as a freelancer to build credibility ? OR should I sit through my 3 year CS program. I am in heavy student loan debt from my previous degree....so I'm trying to find the fastest way to find a job, or get paid !

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  • Visual Studio 2005 - strange characters rendered for ANSI text

    - by Apogee
    Hi all, Has anyone seen this odd text rendering issue in VS2005 before? The first line of using statements actually says "using System;". If I copy the line as it is displayed and paste into notepad, the text appears correctly, so clearly the character codes are correct. In addition, the solution compiles and runs correctly. I was thinking it might be due to ClearCase using a different character encoding as all the solutions we're using were freshly checked-out yesterday on to a new build machine, but this is only happening in 2 of our ~30 solutions. Incidentally the same .cs files when opened in VS2008 render correctly on this machine, could this be a corruption in VS2005?

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  • Dynamic Programming resources in C?

    - by EsotericMe
    Hi everyone, I'll be writing the online Google test tomorrow as a fresher. Apparently, they definitely ask one problem on Dynamic Programming? Does anyone know of a good resource for collection of DP problems in C along with solutions? I know what DP is & have used it on an occasion or twice. However I feel to crack a DP problem in test, prior practice of typical problems will make it easier to approach. Any good resources or problem sets with solutions in C will be highly appreciated. Thanks.

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  • pleasae help in j2me

    - by samira
    hello i am a student and i am doing my senior project it is about developing an application in j2me for scanning a barcode and extract the number of the barcode in a message to be send. please i search the net but i cant found something usefull i am new at j2me if someone could help me with sourch code and how to create it i will be very thankfull my email is [email protected] thanks in advanced

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  • Relation to multiple tables of different types for rating?

    - by Tronic
    i have a table structure like this Products Team Images and want to implement a rating/commenting-feature, where users can rate each entry of all tables. what's the best way to make a single rating table? e.g. a user votes a a product and a team entry, and it should be possible to get alle these entries from a single table. what kind of table-structure is best for this purpose? i hope, my questions is clear enough :/ thanks in advance!

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  • Using Matlab to interface with sensors

    - by nortron
    Im currently an E.E. under grad. and i was curious about matlab, I am now on break and i want to take my matlab a step beyond what i know (which is beginner to intermediate). For an example, i heard about a student doing a project that involved matlab controlling sensors to detect sunlight (solar panel related) and I am not sure how he did it?

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  • Conditional themes in Visual Studio 2008

    - by Bala R
    Can I have different visual studio themes associated to different solutions? Here's my problem. I have two files with sames names that have almost identical contents from two different solutions, open simultaneously. Of course, I have the first solution open and the file from the second solution is opened from explorer and has no connection to the first solution what so ever. Is there any way I can distinguish the the file that belongs to the solution from the other file, just by a different tab color or something like that and without hovering over the tab to look up the path. Thanks

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  • In Asp.net i'm not able to catch any exception properly?

    - by Anand
    In Asp.net (c#),i'm not able to catch exception(FileNotFoundException) properly... i don't know the reason..Actually File s not there..But catch statement fails to catch the exception.. here is the code.. try { System.Drawing.Image imgg1 = System.Drawing.Image.FromFile(Server.MapPath("").ToString() + "\\images\\img1.jpg"); } catch (FileNotFoundException) { Response.Write("<script>alert('Please Select and upload Student's Photo');</script>"); }

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  • How do I mount a remote Linux folder in Windows through SSH?

    - by Jared
    I'm a blind student currently in a system admin/shell programming class. Although ssh works fine for executing commands like ls, pwd, etc editors do not work well with my screen reader and an ssh session. I was wondering if it is possible to mount a Linux folder over ssh so it appears as a windows drive? This way I could edit any files I needed to with accessible software and not have to constantly use SCP to send files back and fourth.

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