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  • How to create instances of a class from a static method?

    - by Pierre
    Hello. Here is my problem. I have created a pretty heavy readonly class making many database calls with a static "factory" method. The goal of this method is to avoid killing the database by looking in a pool of already-created objects if an identical instance of the same object (same type, same init parameters) already exists. If something was found, the method will just return it. No problem. But if not, how may I create an instance of the object, in a way that works with inheritance? >>> class A(Object): >>> @classmethod >>> def get_cached_obj(self, some_identifier): >>> # Should do something like `return A(idenfier)`, but in a way that works >>> class B(A): >>> pass >>> A.get_cached_obj('foo') # Should do the same as A('foo') >>> A().get_cached_obj('foo') # Should do the same as A('foo') >>> B.get_cached_obj('bar') # Should do the same as B('bar') >>> B().get_cached_obj('bar') # Should do the same as B('bar') Thanks.

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  • Local use of MySQL database

    - by waanders
    Hi all, Is it possible to use MySQL local? I mean NOT at a server. I read a lot about MySQL on a webserver with PHP, Joomla etc. I want to program a piece of software and use a database local to store results. Can I use MySQL for that? If so, is ther anyware on the net a good tutorial how to do that?

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  • strange run time error message from CIImage initWithContentsOfURL

    - by Adam
    When executing the following code I receive a run time error when the code executes the second line of code. The error (which shows up in the debugger) says: [NSButton initWithContentsOfURL:]: unrecognized selector sent to instance 0x100418e10. I don't understand this message, because it looks to me (based on my source code) like the initWithContentsOfURL message is being sent to the myImage instance (of the CIImage class) ... not NSButton. Any idea what is going on? If it matters ... this code is in the Application Controller class module of an Xcode project (a Cocoa application) -- within a method that is called when I click on a button on the application window. There is only the one button on the window ... // Step1: Load the JPG file into CIImage NSURL *myURL = [NSURL fileURLWithPath:@"/Users/Adam/Documents/Images/image7.jpg"]; CIImage *myImage = [myImage initWithContentsOfURL: myURL]; if (myImage = Nil) { NSLog(@"Creating myImage failed"); return; } else { NSLog(@"Created myImage successfully"); }

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  • Question about decorator pattern and the abstract decorator class?

    - by es11
    This question was asked already here, but rather than answering the specific question, descriptions of how the decorator pattern works were given instead. I'd like to ask it again because the answer is not immediately evident to me just by reading how the decorator pattern works (I've read the wikipedia article and the section in the book Head First Design Patterns). Basically, I want to know why an abstract decorator class must be created which implements (or extends) some interface (or abstract class). Why can't all the new "decorated classes" simply implement (or extend) the base abstract object themselves (instead of extending the abstract decorator class)? To make this more concrete I'll use the example from the design patterns book dealing with coffee beverages: There is an abstract component class called Beverage Simple beverage types such as HouseBlend simply extend Beverage To decorate beverage, an abstract CondimentDecorator class is created which extends Beverage and has an instance of Beverage Say we want to add a "milk" condiment, a class Milk is created which extends CondimentDecorator I'd like to understand why we needed the CondimentDecorator class and why the class Milk couldn't have simply extended the Beverage class itself and been passed an instance of Beverage in its constructor. Hopefully this is clear...if not I'd simply like to know why is the abstract decorator class necessary for this pattern? Thanks. Edit: I tried to implement this, omitting the abstract decorator class, and it seems to still work. Is this abstract class present in all descriptions of this pattern simply because it provides a standard interface for all of the new decorated classes?

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  • Storing a repository in subversion and git

    - by Ceilingfish
    Hi, I'm currently trying to convince my company to migrate to git from subversion, and one thing that would be really helpful would be to allow me to store a repository in subversion and git at the same time (then I can show them how easy it is to do in git what they've spent an hour trying to do in subversion). I guess that I could put my subversion repository straight into git, but this seems to leave loads of .svn artifacts in each directory. Does anyone know if there's a way to avoid this?

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  • Cassandra Production ready on Windows?

    - by BlackTea
    Question anyone know of any success stories of Cassandra running on windows in a production environment? I'm doing some work on Cassandra and trying to find the correct platform for it currently the platform is windows running MS-SQLas the data store. what are the dis-advantages if any when running Cassandra on a windows environment.

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  • Compare Database container and class container

    - by Mohit Deshpande
    I am using a SQL Server database in my current project. I was watching the MVC Storefront videos (specifically the repository pattern) and I noticed that Rob (the creator of MVC Storefront) used a class called Category and Product, instead of a database and I have notice that using LINQ-SQL or ADO.NET, that a class is generated. Is there an advantage to using a class over a database to store information? Or is it the other way around? Or are they even comparable?

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  • python script to download xml files on my server

    - by Blankman
    I need a python script that will do the following: connect to a URL, and that URL will return a number like 1200. Use the number, to download xml files named: 1 to x where x is the number from #1. store the files in a particular directory. Sorry I've never written a python script, so if you could guide me along that would be great (maybe with a some comments). I will be running this as a cron job if that matters.

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  • two controllers in one layout, rails 3

    - by Grizlord
    Okay, I have two models, a recipe model and a category model. In my layout(application.html.erb) I have a main container div that "yields" the recipes index action. I'm trying to list all the category names as links in a side bar(also a div) by iterating over them in an unordered list. When you click one of the links it will go to the category show page which will then list all the recipes in that category. Here is how I'm trying to list the links in - <div class="container" id="categories"> <% for category in @categories %> <ul> <li><%= link_to category.name, category %></li> </ul> <% end %> </div> The problem is I get a NoMethodError - You have a nil object when you didn't expect it! You might have expected an instance of Array. The error occurred while evaluating nil.each It is not retrieving the records from the model. Any suggestions on how to get this done would be greatly appreciated. I tried to render a partial as some of the other similar posts have said but still get the same error. This is the exact error - NoMethodError in Recipes#index Showing /Users/grizlord/Rails/recipe2/app/views/layouts/application.html.erb where line #39 raised: You have a nil object when you didn't expect it! You might have expected an instance of Array. The error occurred while evaluating nil.each Extracted source (around line #39): 36: </div> 37: <div class="container" id="categories"> 38: Browse by Category 39: <% for category in @categories %> 40: <ul> 41: <li><%= link_to category.name, category %></li> 42: </ul>

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  • Array within Form collecting multiple values with the same name possible?

    - by JM4
    Good afternoon, I will first start with the goal I am trying to accomplish and then give a very basic sample of what I need to do. Goal Instead of collecting several variables and naming them with keys individually, I have decided to give in and use an array structure to handle all inputs of the same type and rules. Once I have the variables, I will validate against them and if 'ok' store them in a MySQL table. The table will hold consumer information and will need to store multiple rows of the same type of information. First Pass I will leave out the validation portion of this question because I feel I need to first understand the basics. <form action="?" method="POST" name="Form"> Member 1 First Name:<input type="text" name="MemberFirstName[]" /><br /> Member 1 Last Name: <input type="text" name="MemberLastName[]" /><br /> Member 1 Email: <input type="text" name="MemberEmail[]" /><br /> Member 2 First Name:<input type="text" name="MemberFirstName[]" /><br /> Member 2 Last Name: <input type="text" name="MemberLastName[]" /><br /> Member 2 Email: <input type="text" name="MemberEmail[]" /><br /> Member 3 First Name:<input type="text" name="MemberFirstName[]" /><br /> Member 3 Last Name: <input type="text" name="MemberLastName[]" /><br /> Member 3 Email: <input type="text" name="MemberEmail[]" /><br /> <input type="submit" name="submit" value="Continue" /> </form> I am hoping that each input given for First Name (a required field) will generate a unique key for that particular entry and not overwrite any data entered. Because I am carrying information from page to page (checkout form), I am turning the POST variables into SESSION variables then storing in a mysql database in the end. My hope is to have: <?php $conn = mysql_connect("localhost", "username", "password"); mysql_select_db("DBname",$conn); $sql = "INSERT INTO tablename VALUES ('$_SESSION[Member1FirstName]', '$_SESSION[Member1LastName]', '$_SESSION[Member1Email]', '$_SESSION[Member2FirstName]', '$_SESSION[Member2LastName]', '$_SESSION[Member2Email]', '$_SESSION[Member1FirstName]', '$_SESSION[Member3LastName]', '$_SESSION[Member3Email]')"; $result = mysql_query($sql, $conn) or die(mysql_error()); Header ("Location: completed.php"); ?> Where Member1, Member2, and Member3 values will appear on their own row within the table. I KNOW my code is wrong but I am giving a first shot at the overall business purpose I am trying to achieve and trying to learn how to code the right way. I am very, very new to programming so any 'baby advice' is greatly appreciated.

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  • Where to put files that will be read in a Rails app?

    - by Guilherme
    I'm developing a Rails application and within that application I developed a Rake task that will read entries from a file and store them into the DB. Producing the code was no problem, but I'd like to know, where do I place the file that is read? Is there a convention for that, if yes, what is it? I know I could have used the seed.rb file but is it ok, by the standards, to load and read a file from there? Thanks in advance!

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  • iPhone app in Norwegian?

    - by Chamira Fernando
    I have an iPhone app which is supposed to be in Norwegian. All my nib files and content are in Norwegian. Then I came to know about language files [Localisation] but I can't see Norwegian in the list of languages in app store, now I'm bit worried about this issue can some one help me?

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  • Java interface and abstract class issue

    - by George2
    Hello everyone, I am reading the book -- Hadoop: The Definitive Guide, http://www.amazon.com/Hadoop-Definitive-Guide-Tom-White/dp/0596521979/ref=sr_1_1?ie=UTF8&s=books&qid=1273932107&sr=8-1 In chapter 2 (Page 25), it is mentioned "The new API favors abstract class over interfaces, since these are easier to evolve. For example, you can add a method (with a default implementation) to an abstract class without breaking old implementations of the class". What does it mean (especially what means "breaking old implementations of the class")? Appreciate if anyone could show me a sample why from this perspective abstract class is better than interface? thanks in advance, George

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  • iPhone: Start or Download App if not exists from Safari

    - by Heinrich
    Hi, I know its possible to open an app from mobile safari using custom URL Handlers. Is it possible to open the App Store from Safari on the iPhone and automatically install the app? Or might it even be possible to open the app if it exists on the users device and to download it if it doesn't? Best, heinrich

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  • How to translate product name and info in Magento

    - by Calua
    Hi everybody, Magento provide translation feature, a nice one for e-commerce platform. But it seems to me that the translation is only for the predefined magento keyword, like 'add to cart', 'add to wishlist' etc and not for the product name, info, and description that the user input to the store. Does anybody know how to implement this?? Any help would be much appreciated Thanks! :)

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  • Maximum size of email X-Headers

    - by Spike Williams
    We are looking at sticking some metadata into the X-Headers of email messages. These emails are for consumption by internal systems, and will be hosted on an Exchange server. Is there a maximum size for the ammount of data that we can store in an X-Header? Are there any limitations, such as special characters, that I should know about?

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  • Java Web Application on Tomcat - Displaying a File Uploaded by User

    - by walnutmon
    I need to display uploaded files on a web application, the flow is as follows User uploads file through web UI Validation on image Makes call to imageRepository.store( uploadedImage, user.getSite() ) The user wants the image displayed which adds <img src="${anUploadedImage.getUrl()}"/> but that is where I'm stuck, what can getUrl() do? The simple solution is to put it someplace and let Apache serve the file, but then I can't use the application to ensure that one user isn't modifying the URL to view other users files, which in this case is important

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  • Cakephp change model's title without rename model/dbtable

    - by Vincent
    I have a table that store all information about class, but because Class is reserved for class name I had to rename the table from classes to types. But in the view section I need it to be displayed as "Class", including the Paginator links. Anyway to achieve this by adding something in the Type model, without completely customize Paginator and and all view compoenents?

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  • Class type while deserialization in c++

    - by Rushi
    I am developing game editor in c++.I have implemented reflection mechanism using DiaSDK.Now I want to store state of the objects(Like Camera,Lights,Static mesh) in some level file via serialization. And later on able to retrieve their state via deserialization.Serializing objects is not a problem for me.But while deserializing objects how do I know class type?so that i can create object of that particular type.

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  • Ruby on rails - how to retrieve connection strings

    - by Jett
    Hi Everyone, Are there any ways to retrieve the database connection string where my ruby is connected? what i would like to get is the: 1) Database name where the ruby is connected 2) The username of the SQL Server 3) Password of the SQL Server 4) Server name I want to store it in session variables. (I'am using MS SQL Server.) Please help! thanks!

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