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  • Help needed with MySQL query to join data spanning multiple tables with data used as column names

    - by gurun8
    I need a little help putting together a SQL query that will give me the following resultsets: and The data model looks like this: The tricky part for me is that the columns to the right of the "Product" in the resultset aren't really columns in the database but rather key/value pairs spanned across the data model. Table data is as follows: My apologies in advance for the image heavy question and the image quality. This just seemed like the easiest way to convey the information. It'll probably take someone less time to write the query statement to achieve the results than it did for me to assemble this question. By the way, the "product_option" table image is truncated but it illustrated the general idea of the data structure. The MySQL server version is 5.1.45.

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  • Whats the scope of a c function defined within objective-c class?

    - by roja
    I was reading up about bypassing objective-c's messaging to gain performance (irrelevant to this specific question) when i found an interesting bit of code: #import <Cocoa/Cocoa.h> @interface Fib : NSObject { } - (long long) cFib: (NSUInteger) number; @end @implementation Fib // c implementation of fib long long cFibIMP(NSUInteger number) { return (number < 3) ? 1 : cFib(number - 1) + cFib(number - 2); } // method wrapper for c implementation of fib - (long long) cFib: (NSUInteger) number { return cFibIMP(number); } @end My question is; when using c function, within an objective-c object, what scope is the c function (cFibIMP in this particular case) placed in? Does the objective-c class encapsulate the c function removing change of name-clash or is the c function simply dumped into the global scope of the whole objective-c program?

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  • Developing Silverlight 1.0 Applications on VS2008 SP1

    - by Moo
    Hi, Can anyone point me to any guides, howto's or general documentation on how to develop Silverlight 1.0 (it has to be 1.0) on VS2008 SP1. I have searched high and low for information, and it all seems to be out of date (referencing Silverlight 1.0 Tools for Visual Studio 2008 beta, release candidate and alpha packages) or just plain doesn't work under VS2008 SP1. What do I need to install, and which project do I need to create? I have installed the Silverlight 1.0 SDK, which gave me no starting point, the Silverlight 2.0 Tools for Visual Studio after a website suggested you could use that to develop 1.0 apps, but the suggested template doesn't exist, and Silverlight 3.0 Tools for Visual Studio, which was a last ditch resort. Regards Moo

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  • How is it that the abstract class XmlWriter can be instantiated using XmlWriter.Create(... ?

    - by Cognize
    Hi, Just looking to clarify my understanding of the workings of the XmlWriter and abstract classes in general. My thinking is (was) that an abstract class can not be instantiated, although it can contain base methods that can be used by an inheriting class. So, while investigating XmlWriter, I find that to instantiate the XmlWriter, you call XmlWriter.Create(.... , which returns an instance of... XmlWriter, which can then be used: FileStream fs = new FileStream("XML.xml", FileMode.Create); XmlWriter w = XmlWriter.Create(fs); XmlSerializer xmlSlr = new XmlSerializer(typeof(TestClass)); xmlSlr.Serialize(fs, tsIn); This clearly works, as tested. Can anyone help me understand what is going on here. As far as I can see there is or should be no 'instance' to work with here??

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  • How to generate pdf files _with_ utf-8 multibyte characters using Zend Framework

    - by Sejanus
    Hello, I've got a "little" problem with Zend Framework Zend_Pdf class. Multibyte characters are stripped from generated pdf files. E.g. when I write aabccdee it becomes abcd with lithuanian letters stripped. I'm not sure if it's particularly Zend_Pdf problem or php in general. Source text is encoded in utf-8, as well as the php source file which does the job. Thank you in advance for your help ;) P.S. I run Zend Framework v. 1.6 and I use FONT_TIMES_BOLD font. FONT_TIMES_ROMAN does work

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  • Windows XP Home Edition SP3 cant recognise PCMIA SD Card

    - by Pozo
    System Specifications: Laptop : Dell Inspiron 6000 OS: Windows Home Edition SP3 SD Adapter: Hagiwara Smart Media Adapter I inserted the card into the slot, windows xp recognises the device, lists the pcmia controller on the device manager list, an entry appears under the IDE ATA/ATAPI category on the device manager as well. However, the device does not show under my computer and the driver does not get assigned a letter number. I checked the system logs from the device manager and there were no logged errors. Checking the Hagiwara support website, the manufacturer indicates that the adapter driver is the same as the windows xp pcmia controller. Checking Dell's website, no specific drivers were listed for that either. General Search on the web indicates that multiple people face similar problems with their SD cards, yet none actually spell out the route issue that causes this. Please let me know if you have any suggestions for further debugging. Thanks in advance

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  • What are the best uses for each programming language?

    - by VirtuosiMedia
    I come from a web developer background, so I'm fairly familiar with PHP and JavaScript, but I'd eventually like to branch out into other languages. At this point, I don't have a particular direction or platform that I'm leaning toward as far as learning a new language or what I would use it for, but I would like to learn a little bit more about programming languages in general and what each one is used for. I've often heard (and I agree) that you should use the right tool for the job, so what jobs are each programming language best suited for? Edit: If you've worked with some of the newer or more obscure languages, please share for those as well.

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  • Optimising Database Calls

    - by Dwaine Bailey
    I have a database that is filled with information for films, which is (in turn) read in to the database from an XML file on a webserver. What happens is the following: Gather/Parse XML and store film info as objects Begin Statement For every film object we found: Check to see if record for film exists in database If no film record, write data for film Commit Statement Currently I just test for the existence of a film using (the very basic): SELECT film_title FROM film WHERE film_id = ? If that returns a row, then the film exists, if not then I need to add it... The only problem is, is that there are many many hundreds of records in the database (lots of films!) and because it has to check for the existence of a film in the database before it can write it, the whole process ends up taking quite a while (about 27 seconds for 210 films) Is there a more efficient method of doing this, or just any suggestions in general? Programming Language is Objective-C, database is in sqlite3 Thanks, Dwaine

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  • How do you sort files numerically?

    - by Zachary Young
    Hello all, First off, I'm posting this because when I was looking for a solution to the problem below, I could not find one on stackoverflow. So, I'm hoping to add a little bit to the knowledge base here. I need to process some files in a directory and need the files to be sorted numerically. I found some examples on sorting--specifically with using the lamba pattern--at wiki.python.org, and I put this together: #!env/python import re tiffFiles = """ayurveda_1.tif ayurveda_11.tif ayurveda_13.tif ayurveda_2.tif ayurveda_20.tif ayurveda_22.tif""".split('\n') numPattern = re.compile('_(\d{1,2})\.', re.IGNORECASE) tiffFiles.sort(cmp, key=lambda tFile: int(numPattern.search(tFile).group(1))) print tiffFiles I'm still rather new to Python and would like to ask the community if there are any improvements that can be made to this: shortening the code up (removing lambda), performance, style/readability? Thank you, Zachary

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  • Potential for SQL injection here?

    - by Matt Greer
    This may be a really dumb question but I figure why not... I am using RIA Services with Entity Framework as the back end. I have some places in my app where I accept user input and directly ask RIA Services (and in turn EF and in turn my database) questions using their data. Do any of these layers help prevent security issues or should I scrub my data myself? For example, whenever a new user registers with the app, I call this method: [Query] public IEnumerable<EmailVerificationResult> VerifyUserWithEmailToken(string token) { using (UserService userService = new UserService()) { // token came straight from the user, am I in trouble here passing it directly into // my DomainService, should I verify the data here (or in UserService)? User user = userService.GetUserByEmailVerificationToken(token); ... } } (and whether I should be rolling my own user verification system is another issue altogether, we are in the process of adopting MS's membership framework. I'm more interested in sql injection and RIA services in general)

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  • What is the most efficient way to find missing semicolons in VS with C++?

    - by Dr. Monkey
    What are the best strategies for finding that missing semicolon that's causing the error? Are there automated tools that might help. I'm currently using Visual Studio 2008, but general strategies for any environment would be interesting and more broadly useful. Background: Presently I have a particularly elusive missing semicolon (or brace) in a C++ program that is causing a C2143 error. My header file dependencies are fairly straightforward, but still I can't seem to find the problem. Rather than post my code and play Where's Wally (or Waldo, depending on where you're from) I thought it would be more useful to get some good strategies that can be applied in this and similar situations. As a side-question: the C2143 error is showing up in the first line of the first method declaration (i.e. the method's return type) in a .cpp file that includes only its associated .h file. Would anything other than semicolons or braces lead to this behaviour?

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  • Drupal VS Zikula

    - by DaNieL
    Hi guys! Im new to drupal (just finished my first web site with it), i found it very simple and powerfull to use. Recently, i've been asked to build a community with Zikula. They prefer to use zikula becose it is the 'evolution' of phpnuke, that is the cms that they currently use (i have 'restayling and rebuild' it). Moreover, I want learn and use just 1 cms. So, what are the main differences between drupal and zikula? What are the advantages and disadvantages of one and other? Why should I choose Drupal or Zikula? p.s: i know that the most of the times the answer is 'its all about your needs', but this is supposed to be a general question

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  • Machine learning in OCaml or Haskell?

    - by griffin
    I'm hoping to use either Haskell or OCaml on a new project because R is too slow. I need to be able to use support vectory machines, ideally separating out each execution to run in parallel. I want to use a functional language and I have the feeling that these two are the best so far as performance and elegance are concerned (I like Clojure, but it wasn't as fast in a short test). I am leaning towards OCaml because there appears to be more support for integration with other languages so it could be a better fit in the long run (e.g. OCaml-R). Does anyone know of a good tutorial for this kind of analysis, or a code example, in either Haskell or OCaml?

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  • source control when starting up a new project

    - by jaras
    when starting with a project and using source control i find it hard to separate the things people are working on so they don't either write duplicate code or think it should be named one thing and so on. this problem diminishes over time because the general foundation is in place and it's easier to separate the tasks so they don't overlap as much how do you manage working with source control in the beginning phase? EDIT: I can see that it don't really have anything to do with source control, but it gets more apparent when you have source control too. so the question becomes more along the lines of "how do you manage to separate the tasks so they don't overlap too much. I think it's really hard and i haven't really seen much about how to do it.

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  • Silverlight error-handling conventions: There is no relationship between onSilverlightError and Repo

    - by rasx
    When I see the call System.Windows.Browser.HtmlPage.Window.Eval (which is evil) in ReportErrorToDOM (in App.xaml.cs) this shows me that it has no relationship to onSilverlightError. So what kind of JavaScript-based scenario calls onSilverlightError? When will onSilverlightError definitely be needed? What are Silverlight error-handling conventions in general? This is a very important comment by Erik Monk but needs more detail: There are 2 kinds of terminal errors in Silverlight. 1) Managed errors (hit the managed Application_UnhandledException method). Note that some errors may not even get to this point. If the managed infrastructure can't be loaded for some reason (out of memory error maybe...), you won't get this kind of error. Still, if you can get it, you can use a web service (or the CLOG project) to communicate it back to the server. 2) Javascript errors.

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  • C++: set of C-strings

    - by Nicholas
    I want to create one so that I could check whether a certain word is in the set using set::find However, C-strings are pointers, so the set would compare them by the pointer values by default. To function correctly, it would have to dereference them and compare the strings. I could just pass the constructor a pointer to the strcmp() function as a comparator, but this is not exactly how I want it to work. The word I might want to check could be part of a longer string, and I don't want to create a new string due to performance concerns. If there weren't for the set, I would use strncmp(a1, a2, 3) to check the first 3 letters. In fact, 3 is probably the longest it could go, so I'm fine with having the third argument constant. Is there a way to construct a set that would compare its elements by calling strncmp()? Code samples would be greatly appreciated.

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  • Do I correctly understand what a class is?

    - by Matt
    I've had trouble finding a clear, concise laymans definition of a class. Usually, they give general ideas without specifically spelling it out, and I'm wondering if I'm understanding this correctly. As I understand it, a class is the set of code that controls an object. For example, in an app that has a button for 'Yes' and a button for 'No', and a text box for output, the code that tells the computer what to do when the user uses the Yes button is one class, the code for hitting No is another class, and an object is the two buttons and what they do together to influence the output box. Am I right, or am I confusing terms here? Thanks

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  • Cannot run file_get_contents() on PHP 5.2.9-2

    - by Obay
    Hello, I am having the same problem as described below. http://marc.info/?l=php-general&m=124104032703506 The guy answered his own question by: "Sorry, didn't pay attention to the registered streams :-( You need to install a PHP package with ssl or compile it with --with-openssl." What does that mean? I'm fairly new to all this stuff and I don't quite understand what he was talking about, (e.g. registered streams, ssl). We have another server that has SSL. Does he mean that if I just transfer to that server, problem solved? Or is there anything else I need to consider? Can you please help me out? Any help is much appreciated :)

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  • Ampersand in link description text?

    - by kitenski
    I am validating my site using validator.w3.org and have an issue where there is a & in my link description text. ie this is taken from the source <a class='tag' href='/php/iphone software.php?function=developer&amp;dev=witch%26wizards+inc.&amp;store=143441'>witch&wizards inc.</a> Which gives me this error in the validator Line 188, Column 540: cannot generate system identifier for general entity "wizards" …6wizards+inc.&store=143441'witch&wizards inc. If I urlencode the description then the validation passes, but the user then sees the text displayed urlencoded, ie Developer witch%26wizards+inc. However I believe it's much more user friendly if this was displayed unencoded, ie Developer witch&wizards inc. Is there a way to pass validation but still have user friendly text displayed? Thanks, Greg

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  • How do I select the number of distinct days in a date range?

    - by isme
    I'm trying to use the T-SQL function DATEDIFF to select the number of distinct dates in a time period. The following query: SELECT DATEDIFF(DAY, '2012-01-01 01:23:45', '2012-01-02 01:23:45') selects 1, which is one less than I want. There are two distinct dates in the range: 2012-01-01 and 2012-01-02. It is not correct to add one to the result in the general case. The following query: SELECT DATEDIFF(DAY, '2012-01-01 00:00:00', '2012-01-02 00:00:00') selects 1, which is correct, because there is only one distinct date in the range. I'm sure there is a simple bit of arithmetic that I'm missing to calculate this. Can someone help me?

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  • Google Vizualization with CSV data

    - by Shlomo Shmai
    Hi, I have a URL that returns data in CSV format. I would like to use Google Vizualization to create an interactive chart of the data. I've looked at several examples on Google Chart and Vizualization web page but I'm a bit confused as I'm not familiar with JavaScript or web programming in general. Question: Do I have to use JavaScript to parse the CSV string myself and manually construct the DataTable with addColumn() and addRows()? Or, is there a way to simply pass the CSV url to the charting function? I'm hoping to do something like this: var csv_data = get_data_from_url('http://...') var data = new google.visualization.DataTable(csv_data); var chart = new google.visualization.PieChart(document.getElementById('chart_div')); chart.draw(data, ...); Can someone please help me out? Thanks.

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  • Saving Blob data from SQLite database to a file

    - by Felipe
    Hello, I'm trying to save blob data from a SQLite database (Safari cache: Cache.db) to a file, but for some reason sqlite won't read the whole blob. I eventually would like to do this in ruby, but for now something that works directly in sqlite command prompt is fine. Also, I've read all of the entries that talk about this here on stackoverflow, but most of them only discuss the performance of saving images in blobs and the one entry that does show to save blobs to file is in C# which does not help me. Here is what I've tried: sqlite select * from cfurl_cache_response limit 1; 3501|0|945281827|0|http://www.gospelz.com/components/com_jomcomment/smilies/guest.gif|2010-02-24 16:20:07 sqlite select receiver_data from cfurl_cache_blob_data where entry_ID = 3501; GIF89a( A hexdump of the original (guest.gif) file shows that sqlite stops reading the blob after the first null value: $ hexdump -C guest.gif 00000000 47 49 46 38 39 61 28 00 28 00 f7 00 00 f1 f5 fd |GIF89a(.(.......| sqlite .output test.gif sqlite select receiver_data from cfurl_cache_blob_data where entry_ID = 3501; $ hexdump -C test.gif 00000000 47 49 46 38 39 61 28 0a |GIF89a(.|

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  • How do I sum up weighted arrays in PHP?

    - by christian studer
    Hod do I multiply the values of a multi-dimensional array with weigths and sum up the results into a new array in PHP or in general? The boring way looks like this: $weights = array(0.25, 0.4, 0.2, 0.15); $values = array ( array(5,10,15), array(20,25,30), array(35,40,45), array(50,55,60) ); $result = array(); for($i = 0; $i < count($values[0]); ++$i) { $result[$i] = 0; foreach($weights as $index => $thisWeight) $result[$i] += $thisWeight * $values[$index][$i]; } Is there a more elegant solution?

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  • How to find a programmer for my project?

    - by Al
    I'm building a web application to generate monthly subscription fees, but I've quickly realised I'm going to need some help with the project to finish it this century. I don't have any money upfront for a freelancer and every website I've found takes bids for project work. The tasks that need doing are flexible too because I can do whatever the other coder doesn't want to. I'm also happy to guide the developer and offer tips for performance/security/etc etc. My question is; how do I go about finding someone to work with on a profit-share basis? I'm sure there are a billion people like me with the "next killer app" but I genuinely believe in it. Can anyone offer some advice? Thanks in advance! EDIT: I guess the trick is to find someone passionate enough about the subject as I am. Where would I find someone? Are there websites that broker profit-share deals on programming work?

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  • Jquery selectors by CSS class in IE is really slow--workarounds?

    - by Sam Lee
    I have a web app where I have several elements with class="classA". I want to select and apply a function to all of them. I am doing the obvious thing, which is $(".classA").each(function () { ... }). This works just fine in Chrome/Safari/Firefox but is really slow in IE. It turns out IE has serious performance issues when selecting things by CSS class in jQuery. I was wondering if anyone has suggestions on good ways to deal with this. I can't use ID selectors because there can be multiple DOM elements I want to select.

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