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  • Are separate business objects needed when persistent data can be stored in a usable format?

    - by Kylotan
    I have a system where data is stored in a persistent store and read by a server application. Some of this data is only ever seen by the server, but some of it is passed through unaltered to clients. So, there is a big temptation to persist data - whether whole rows/documents or individual fields/sub-documents - in the exact form that the client can use (eg. JSON), as this removes various layers of boilerplate, whether in the form of procedural SQL, an ORM, or any proxy structure which exists just to hold the values before having to re-encode them into a client-suitable form. This form can usually be used on the server too, though business logic may have to live outside of the object, On the other hand, this approach ends up leaking implementation details everywhere. 9 times out of 10 I'm happy just to read a JSON structure out of the DB and send it to the client, but 1 in every 10 times I have to know the details of that implicit structure (and be able to refactor access to it if the stored data ever changes). And this makes me think that maybe I should be pulling this data into separate business objects, so that business logic doesn't have to change when the data schema does. (Though you could argue this just moves the problem rather than solves it.) There is a complicating factor in that our data schema is constantly changing rapidly, to the point where we dropped our previous ORM/RDBMS system in favour of MongoDB and an implicit schema which was much easier to work with. So far I've not decided whether the rapid schema changes make me wish for separate business objects (so that server-side calculations need less refactoring, since all changes are restricted to the persistence layer) or for no separate business objects (because every change to the schema requires the business objects to change to stay in sync, even if the new sub-object or field is never used on the server except to pass verbatim to a client). So my question is whether it is sensible to store objects in the form they are usually going to be used, or if it's better to copy them into intermediate business objects to insulate both sides from each other (even when that isn't strictly necessary)? And I'd like to hear from anybody else who has had experience of a similar situation, perhaps choosing to persist XML or JSON instead of having an explicit schema which has to be assembled into a client format each time.

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  • SQL SERVER Disabled Index and UpdateStatistics

    When we try to update the statistics, it throws an error as if the clustered index is disabled. Now let us enable the clustered index only and attempt to update the statistics of the table right after that. Have you ever come across the situation where a conversation never gets over and it continues even [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Quantcast Media Planner

    Have you ever wondered what type and how many people are visiting your website? If you answered "yes" to the previous question, you will be pleased to know that there are online tools available that allow people to analyse the relevance and effectiveness of their web pages.

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  • SQLBits IV Conference

    I am very proud to announce that I will be presenting at this free conference in Manchester on 28.03.2009.  My session will be on mixing SSIS and Data Mining.  It is a free conference organized by people giving up their own time and is aimed at the community.  Everybody I know who has ever been always says that they enjoyed it.   For more details go to www.SQLBits.com

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  • Is it appropriate to try to control the order of finalization?

    - by Strilanc
    I'm writing a class which is roughly analogous to a CancellationToken, except it has a third state for "never going to be cancelled". At the moment I'm trying to decide what to do if the 'source' of the token is garbage collected without ever being set. It seems that, intuitively, the source should transition the associated token to the 'never cancelled' state when it is about to be collected. However, this could trigger callbacks who were only kept alive by their linkage from the token. That means what those callbacks reference might now in the process of finalization. Calling them would be bad. In order to "fix" this, I wrote this class: public sealed class GCRoot { private static readonly GCRoot MainRoot = new GCRoot(); private GCRoot _next; private GCRoot _prev; private object _value; private GCRoot() { this._next = this._prev = this; } private GCRoot(GCRoot prev, object value) { this._value = value; this._prev = prev; this._next = prev._next; _prev._next = this; _next._prev = this; } public static GCRoot Root(object value) { return new GCRoot(MainRoot, value); } public void Unroot() { lock (MainRoot) { _next._prev = _prev; _prev._next = _next; this._next = this._prev = this; } } } intending to use it like this: Source() { ... _root = GCRoot.Root(callbacks); } void TransitionToNeverCancelled() { _root.Unlink(); ... } ~Source() { TransitionToNeverCancelled(); } but now I'm troubled. This seems to open the possibility for memory leaks, without actually fixing all cases of sources in limbo. Like, if a source is closed over in one of its own callbacks, then it is rooted by the callback root and so can never be collected. Presumably I should just let my sources be collected without a peep. Or maybe not? Is it ever appropriate to try to control the order of finalization, or is it a giant warning sign?

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  • .NET processing unit [closed]

    - by configurator
    Do you think we'll ever see an IL (or other bytecode) processing unit? It sounds possible and would have a major benefit, because we wouldn't need the JITter. This isn't the same as compiling .NET directly to machine code, since the bytecode here is designed to be programmed and disassembled easily, unlike the bytecode used in x86 processors which is designed to work faster. What's stopping Intel (for example) from partnering with Microsoft and making such a .NET-optimised processor?

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  • cannot execute iexplore.exe when I create a symbolic link to it

    - by deostroll
    I do something like: $ ln -s '/home/deostroll/.wine/dosdevices/c:/Program Files/Internet Explorer/iexplore.exe' /usr/bin/iexplore I am expecting that at the shell I can just type the following and expect the internet explorer browser window to show up: $ pwd <where ever> $ iexplore But instead I get the following error message: wine: cannot find L"Z:\\usr\\bin\\iexplore." What am I doing wrong?

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  • How to Get Niche Specific Back Links

    Ever since the day search engines came into existence, webmasters have been trying to get their websites to the much coveted top page ranks on search engine results page (SERPS). For people who have little knowledge about getting niche specific backlinks to their website, link building is a serious headache.

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  • SEO Can Really Help Your Company

    As the corporate world becomes ever more information hungry, SEO has become an integral part of marketing strategy. Most companies know that having a website is good for business but few understand how to make it work properly for them. Engaging a reputable SEO firm to do the work for them is the best way forward because if you cannot be found when potential customers are looking for you, you will not have an effective presence online.

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  • The World of Web Application

    Have you ever browsed through various websites dealing over a variety of subjects and information as well as trade and commerce? There are several functions that are enabled within a site. You may have made a certain payment for an airline ticket online or even an online auction where you made a bid for a certain product.

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  • The Keyword - Lifeblood of the Website

    Before we started to build our website, we did not have a clue, nor had we ever heard the word keyword. It was only after reading many directives and articles like this did we come to realize the importance of the keyword in traffic building and for searching subjects.

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  • Expected visual behavior of notifications (gnome metacity)

    - by MetaChrome
    I sometimes see notification popups on the right of the screen that specify things like network connectivity status changes mainly. I don't understand their expected visual behavior in that: It would appear that sometimes, when you move your mouse close to them, they disappear to reappear when you move away. It does not appear to be possible to ever click on them or hide them in any way, they generally just flicker, often in a in determinant way. Is the flickering perhaps caused because every flicker is in fact a unique notification?

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  • Under which circumstances (if any) does it make sense to work for a startup, for free?

    - by blueberryfields
    I've been bumping around the startup world for a while, and most startups I've seen seem to have (amongst other things) two things in common: A lack of money An inability to, reliably, hire good quality developers This means that, for startups, the ideal hire is someone who is free - where they can wait until they've both raised money and found out that the hire is worth his price tag. When (if ever) is this a win win situation? For you, as a programmer or software developer, when would this make sense?

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  • Work around for calculating age using the SQL Server DateDiff function

    Have you ever wanted to compute age, but the results from the DATEDIFF function seemed to be wrong some of the time? This tip covers why the DATEDIFF function does not always reliably compute age. New! SQL Monitor 3.0 Red Gate's multi-server performance monitoring and alerting tool gets results from Day One.Simple to install and easy to use – download a free trial today.

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  • 3 KDE Add-ons Worth Trying

    <b>MakeTechEasier:</b> "Ever so often, I look around for rather random add-ons that make my desktop experience more pleasant or occasionally even serve a meaningful purpose. They range from full applications to very basic widgets. In no particular order, here are a few that I have recently encountered and are worth mentioning."

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  • How to make code-review feel less like a way to *shift* the responsibility? [duplicate]

    - by One Two Three
    This question already has an answer here: How do you make people accept code review? 33 answers Sometimes it seems to me that people ask for code-reviews just so they would be able to say "Xyz reviewed my code!"(1) when something broke. Question, is that ever the case? (Or is it just my imagination) If it is, how do I handle this? (1): What s/he really meant: It's Xyz's fault or something along those lines.

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  • How to Enable Click To Play Plugins in Google Chrome

    - by Taylor Gibb
    Have you ever opened a webpage only to have all sorts of multimedia on the page just start playing? Chrome has a hidden setting that was designed to prevent situations just like that. Read on to find out how to enable it. HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference How To Troubleshoot Internet Connection Problems

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  • Gestalt: Unifying Silverlight, IronRuby, XAML, and HTML

    HTML was never designed to allow for the rich interactivity that we’ve unfairly demanded of it in recent years. With our trusty steed, HTML, starting to lag behind, saddled with ever-increasing complexity of modern JavaScript, Gestalt straps a couple of booster rockets onto the old girl, lights the fuse, steps back, and watches as she lifts off into the age of modern web development.

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  • How do you approach tutorials

    - by aurel
    I get lots of interesting tutorials through feeds and sometimes I implement them step by step, other times I just read through them and note anything that I do not know. When ever I implement them I takes a long time - starting the project, typing the code (as I feel there is no point to copy and paste ), then going back and forth between browser and editing program All in all, I am interested to know how do you learn from the tutorials (I'm no where close to being an expert). Or if you don't use tutorials, is there any other way to learn?

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