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  • Should I map a domain object to a view model using an optional constructor?

    - by Byron Sommardahl
    I'd like to be able to map a domain model to a view model by newing up a view model and passing in the contributing domain model as a parameter (like the code below). My motivation is to keep from re-using mapping code AND to provide a simple way to map (not using automapper yet). A friend says the view model should not know anything about the "payment" domain model that's being passed into the optional constructor. What do you think? public class LineItemsViewModel { public LineItemsViewModel() { } public LineItemsViewModel(IPayment payment) { LineItemColumnHeaders = payment.MerchantContext.Profile.UiPreferences.LineItemColumnHeaders; LineItems = LineItemDomainToViewModelMapper.MapToViewModel(payment.LineItems); ConvenienceFeeAmount = payment.ConvenienceFee.Fee; SubTotal = payment.PaymentAmount; Total = payment.PaymentAmount + payment.ConvenienceFee.Fee; } public IEnumerable<Dictionary<int, string>> LineItems { get; set; } public Dictionary<int, string> LineItemColumnHeaders { get; set; } public decimal SubTotal { get; set; } public decimal ConvenienceFeeAmount { get; set; } public decimal Total { get; set; } }

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  • Wordpress + VMware CSS path problem

    - by Stephen Meehan
    I posted a similar question earlier today but this question is clearer. I want to locally develop my Wordpress websites (on my Mac) and test them in Internet Explorer (6,7,8) on Windows XP. I can get the MAMP welcome screen to show in Windows XP, so I know VMWare is doing it's thing. The local URL for my site (on my Mac) is: URL (http://d3creative:8888/) But the local URL under VMware/Internet Explorer is: URL (http://192.168.2.1:8888/d3creative/) This is the only way I can get it to show up, problem is all the CSS styles are referencing the local Mac URL (http://d3creative:8888/) So understandably the CSS isn't showing up. Is there a way to tell Windows that "http://192.168.2.1:8888/d3creative/" should equal "http://d3creative:8888/" I've tried editing the "hosts" file within in Windows XP and I've rebooted after making any changes, but nothing is working. My software: MAMP Pro (v1.8.2) Wordpress (v2.8.6) Windows XP (SP3) Internet Explorer (6, 7, 8) Any help would be much appreciated. Stephen Meehan

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  • How can i add a checkbox for optional files during install? (innosetup)

    - by Globulorozzo
    i'm trying to make a custom checkbox in my custom page (because is a one page installer), is needed only a checkbox without dialogs or anything, the installer that i'm trying to compile is very linear and simple. i want to bind "FILE3.EXE" on a checkbox in this way: if checkbox is checked copy the file (FILE3.EXE) in DestDir, otherwise if checkbox is unchecked skip the file (FILE3.EXE) during installation. This is the code that i use, obviously the checkbox code is missing because i'm not able to do that [Files] Source: FILE1.EXE; DestDir: {app}; Source: FILE2.EXE; DestDir: {app}; Source: FILE3.EXE; DestDir: {app}; //OPTIONAL [Code] procedure ExitProcess(uExitCode: UINT); external '[email protected] stdcall'; var MainPage : TWizardPage; FolderToInstall : TEdit; InstallLocation : String; procedure CancelClick(Sender: TObject); begin if ExitSetupMsgBox then begin ExitProcess(0); end; end; procedure BrowseClick(Sender : TObject); var Dir : String; begin Dir := FolderToInstall.Text; if BrowseForFolder('Browse',Dir,false) then FolderToInstall.Text := Dir; WizardForm.DirEdit.Text := Dir; end; procedure InitializeWizard(); var LabelFolder : TLabel; begin WizardForm.ClientWidth:=ScaleX(550); WizardForm.ClientHeight:=ScaleY(250); WizardForm.Center; WizardForm.OuterNotebook.Hide; WizardForm.InnerNotebook.Hide; WizardForm.Bevel.hide; Wizardform.NextButton.top := 180; Wizardform.NextButton.Left := 470; WizardForm.NextButton.Height := 25; WizardForm.StatusLabel.Parent := WizardForm; WizardForm.StatusLabel.Left := 6; WizardForm.StatusLabel.Top := 206; WizardForm.FilenameLabel.Parent := WizardForm; WizardForm.FilenameLabel.Left := 87; WizardForm.FilenameLabel.Top := 206; WizardForm.FilenameLabel.Width := ScaleX(383); WizardForm.ProgressGauge.Parent := WizardForm; WizardForm.ProgressGauge.Left :=5; WizardForm.ProgressGauge.Top := 222; WizardForm.ProgressGauge.Width := ScaleX(460); MainPage := CreateCustomPage(wpWelcome,'',''); LabelFolder := TLabel.Create(MainPage); LabelFolder.Parent := WizardForm; LabelFolder.Top := 164; LabelFolder.Left := 6; LabelFolder.Caption := 'Directory:' FolderToInstall := TEdit.Create(MainPage); FolderToInstall.Parent := WizardForm; FolderToInstall.Top := 182; FolderToInstall.Left := 85; FolderToInstall.Width := 380; FolderToInstall.Text := WizardDirValue; FolderToInstall.ReadOnly := True; end;

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  • Test All Features of Windows Phone 7 On Your PC

    - by Matthew Guay
    Are you developer or just excited about the upcoming Windows Phone 7, and want to try it out now?  Thanks to free developer tools from Microsoft and a new unlocked emulator rom, you can try out most of the exciting features today from your PC. Last week we showed you how to try out Windows Phone 7 on your PC and get started developing for the upcoming new devices.  We noticed, however, that the emulator only contains Internet Explorer Mobile and some settings.  This is still interesting to play around with, but it wasn’t the full Windows Phone 7 experience. Some enterprising tweakers discovered that more applications were actually included in the emulator, but were simply hidden from users.  Developer Dan Ardelean then figured out how to re-enable these features, and released a tweaked emulator rom so everyone can try out all of the Windows Phone 7 features for themselves.  Here we’ll look at how you can run this new emulator image on your PC, and then look at some interesting features in Windows Phone 7. Editor Note: This modified emulator image is not official, and isn’t sanctioned by Microsoft. Use your own judgment when choosing to download and use the emulator. Setting Up Emulator Rom To test-drive Windows Phone 7 on your PC, you must first download and install the Windows Phone Developer Tools CTP (link below).  Follow the steps we showed you last week at: Try out Windows Phone 7 on your PC today.  Once it’s installed, go ahead and run the default emulator as we showed to make sure everything works ok. Once the Windows Phone Developer Tools are installed and running, download the new emulator rom from XDA Forums (link below).  This will be a zip file, so extract it first. Note where you save the file, as you will need the address in the next step. Now, to run our new emulator image, we need to open the emulator in command line and point to the new rom image.  To do this, browse to the correct directory, depending on whether you’re running the 32 bit or 64 bit version of Windows: 32 bit: C:\Program Files\Microsoft XDE\1.0\ 64 bit: C:\Program Files (x86)\Microsoft XDE\1.0\ Hold your Shift key down and right-click in the folder.  Choose Open Command Window here. At the command prompt, enter XDE.exe followed by the location of your new rom image.  Here, we downloaded the rom to our download folder, so at the command prompt we entered: XDE.exe C:\Users\Matthew\Downloads\WM70Full\WM70Full.bin The emulator loads … with the full Windows Phone 7 experience! To make it easier, let’s make a shortcut on our desktop to load the emulator with the new rom directly.  Right-click on your desktop (or any folder you want to create the shortcut in), select New, and then Shortcut. Now, in the box, we need to enter the path for the emulator followed by the location of our rom.  Both items must be in quotes.  So, in our test, we entered the following: 32 bit: “C:\Program Files\Microsoft XDE\1.0\” “C:\Users\Matthew\Downloads\WM70Full\WM70Full.bin” 64 bit: “C:\Program Files (x86)\Microsoft XDE\1.0\” “C:\Users\Matthew\Downloads\WM70Full\WM70Full.bin” Make sure to enter the correct location of the new emulator rom for your computer, and keep both items in separate quotes.  Click next when you’ve entered the location. Name the shortcut; we named it Windows Phone 7, but simply enter whatever you’d like.  Click Finish when you’re done. You should now have a nice Windows Phone icon and your fully functional shortcut!  Double-click it to run the Windows Phone 7 emulator as above. Features in the Unlocked Windows Phone 7 Emulator So let’s look at what you can do with this new emulator.  Almost everything you’ve seen in demos from the Mobile World Conference and Mix’10 are right here for you to play with.  Here’s the application menu, which you can access by clicking on the arrow on the top of the home screen, which shows how much stuff they’ve got in this!   And, of course, even the home screen itself shows much more activity than it did in the original emulator. Let’s check out some of these sections.  Here’s Zune running on Windows Phone 7, and the Zune Marketplace.  The animations are beautiful, so be sure to check this out yourself. The new picture hub is much nicer than any picture viewer included with Windows Mobile in the past…   Stay productive, and on schedule with the new Calendar. The XBOX hub gives us only a hint of things to come, and the links to games now are simply placeholders. Here’s a look at the Office hub.  This doesn’t show up on the homescreen right now, but you can access it in the applications menu.  Office obviously still has a lot of work left on it, but even at a glance here it looks like it includes a lot more functionality than Office Mobile in Windows Mobile 6. Here’s a look at each of the three apps: Word, Excel, and OneNote, and the formatting pallet in Office apps.   This emulator also includes a lot more settings than the default one, including settings for individual applications. You can even activate the screen lock, and try out the lift-to-peek-or-unlock feature… Finally, this version of Windows Phone 7 includes a very nice SystemInfo app with an advanced task manager.  We hope this is still available when the actual phones are released. Conclusion If you’re excited about the upcoming Windows Phone 7 series, or simply want to learn more about what’s coming, this is a great way to test it out.  With these exciting new hubs and applications, there’s something here for everyone.  Let us know what you like most about Windows Phone 7 and what your favorite app or hub is. Links Please note: These roms are not officially supported by Microsoft, and could be taken down. Download the unlocked Windows Phone 7 emulator from XDA Forums – click the link in this post to download How the unlocked emulator image was created Similar Articles Productive Geek Tips Try out Windows Phone 7 on your PC todayGet stats on your Ruby on Rails codeDisable Windows Vista’s Built-in CD/DVD Burning FeaturesWeek in Geek – The Slick Windows 7 File Copy Animation EditionGeek Fun: Virtualized Old School Windows – Windows 95 TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 PCmover Professional Get Better Windows Search With UltraSearch Scan News With NY Times Article Skimmer SpeedyFox Claims to Speed up your Firefox Beware Hover Kitties Test Drive Mobile Phones Online With TryPhone Ben & Jerry’s Free Cone Day, 3/23/10

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  • What's wrong with this regex (VBScript/Javascript flavor)

    - by OtherMichael
    I'm trying to run a regular expression in VBA code that uses Microsoft VBScript Regular Expressions 5.5 (should be the same as JavaScript regex) regex: ^[0-9A-Z]?[0-9A-Z]{3}[A-Z]?([0-9A-Z]{6})-?([0-9])?$ input: X123A1234567 match: 123456 the six characters I'm interested in give a good match of 123456, ignoring the last (check) digit. Perfect. (The check digit is captured, but it's not a major concern to me). But when BOTH the optional portions are gone (they are optional) the match grabs the last digit GOOD input: 123A1234567 match: 123456 Leave in the optional middle alpha, take out the optional leading alpha, and we still get the good match of 123456 GOOD input: X1231234567 match: 123456 Leave in the optional leading alpha, take out the middle optional alpha, and we still get a good match of 123456 BAD input: 1231234567 match: 234567 Take out BOTH optional alphas, and we get a bad match of 234567 Have a looksee @ the regex testers on http://www.regular-expressions.info/javascriptexample.html or http://www.regular-expressions.info/vbscriptexample.html What am I missing, here? How can I get the regex to ignore the last digit when both optional alphas are missing? The regex is used to feed a lookup system, so that no matter what format the input data, we can match to a complete value.

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  • How can I make an object's hitbox rotate with its texture?

    - by Matthew Optional Meehan
    In XNA, when you have a rectangular sprite that doesnt rotate, it's easy to get its four corners to make a hitbox. However, when you do a rotation, the points get moved and I assume there is some kind of math that I can use to aquire them. I am using the four points to draw a rectangle that visually represents the hitboxes. I have seen some per-pixel collision examples, but I can forsee they would be hard to draw a box/'convex hull' around. I have also seen physics like farseer but I'm not sure if there is a quick tutorial to do what I want.

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  • what is the easiest way to make a hitbox that rotates with it's texture

    - by Matthew Optional Meehan
    In xna when you have a sprite that doesnt rotate it's very easy to get the four corner of a sprite to make a hitbox, but when you do a rotation the points get moved and I assume there is some kind of math that I can use to aquire them. I am using the four points to draw a rectangle that visually represents the hitboxes. I have seen some per-pixel collission examples but I can forsee they would be hard to draw a box/'convex hull' around. I have also seen physics like farseer but I'm not sure if there is a quick tutorial to do what I want. What do you guys think is the best approach becuase I am looking to complete this work by the end of the week.

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  • In Django, what's the best way to handle optional url parameters from the template?

    - by Thierry Lam
    I have the following type of urls which are both valid: hello/ hello/1234/ My urls.py has the following: urlpatterns = patterns('hello.views', url(r'^$', 'index', name='index'), url(r'^(?P<user_id>\d+)/$', 'index', name='index'), ) In my views.py, when I pass user_id to the template, it defaults to 0 if not specified. My template looks like the following, I'm using namespace hello for my hello app: {% url hello:index user_id %} If user_id is not specified, the url defaults to hello/0/. The only way I can think of preventing the default 0 from showing in the url is by an if stmt: {% if user_id %} {% url hello:index user_id %} {% else %} {% url hello:index %} {% endif %} The above will give me hello/ if there are no user_id and hello/1234/ if it's present. Is the above solution the best way to solve this issue?

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  • How to make parameters optional when using Rails named routes?

    - by Jason
    I have a named route: map.find '/find/:category/:state/:search_term/:permalink', :search_term=>nil, :controller=>'find', :action=>'show_match' and the following URL matches it & works OK: http://localhost:3000/find/cars/ca/TestSeachTerm/bumpedupphoto-test but if I take out the 2nd last parameter i.e. "TestSearchTerm", then the route fails to get matched, even though I have :search_term=nil in the route. http://localhost:3000/find/cars/ca//bumpedupphoto-test Can anyone see what I am doing wrong? Being trying to solve this for a few days now. Thanks!

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  • Powershell advanced functions: are optional parameters supposed to get initialized?

    - by Richard Berg
    filter CountFilter($StartAt = 0) { Write-Output ($StartAt++) } function CountFunction { [CmdletBinding()] param ( [Parameter(ValueFromPipeline=$true, Mandatory=$true)] $InputObject, [Parameter(Position=0)] $StartAt = 0 ) process { Write-Output ($StartAt++) } } $fiveThings = $dir | select -first 5 # or whatever "Ok" $fiveThings | CountFilter 0 "Ok" $fiveThings | CountFilter "Ok" $fiveThings | CountFunction 0 "BUGBUG ??" $fiveThings | CountFunction I searched Connect and didn't find any known bugs that would cause this discrepancy. Anyone know if it's by design?

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  • What is the best way to format Django urls for two parameters, either of which are optional?

    - by Parker
    I'm designing a gallery application for viewing vehicle pictures and there are two parameters: Manufacturer Vehicle type Right now you can view either, but not both. Urls go like so: /manufacturer/# /type/# Where # is an ID number. How/can I format my URLs so it can accept both? My current solution is to do: /both/#/# but this requires some retooling since the application doesn't know when you want to filter by both. Any insight would be appreciated.

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  • Fast way to perform addition of 2 LARGE float arrays in Android. Optional JNI or Opengl ES

    - by nathan
    I simply need to add floatArray1 to floatArray2 storing the result in floatArray2.. no third array.. all arrays are one dimensional but are very large... probibly as large as the os will let me get away with. Max i would need is two float arrays with 40,000 floats each... but i could get away with 1/10th that i suppose minimum. Would love to do this in 1/30th or 1/60th of a second but that does not seem possible? Also if the code is JNI,NDK or OpenGL ES thats fine.. does android have an assembly language or like machine code i could use somehow?

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  • Optional structural typing possibilty in C++ or anyother language?

    - by ambhai
    In C++ how to tell compiler that Ogre::Vector3 IS_SAME_AS SomeOtherLIB::Vector3 ? I feel that.. in languages like c++ which are not structural typed but there are cases when it makes sense. Normally as game developer when working with 4+ libraries that provide sort or their own Vector3 implementation. The code is littered with ToOgre, ToThis, ToThat conversion function. Thats a lot of Float3 copying around which should not happen on first place. Is in C++ or any other languages where we dont have to convert (copying) from one type to another which is essentially the samething. But any solution in C++ as most of the good gamedevs libs are for c/c++.

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  • Optional mix of filter parameters in a search the Rails way.

    - by GSP
    I've got a simple list page with a couple of search filters status which is a simple enumeration and a test query which I want to compare against both the title and description field of my model. In my controller, I want to do something like this: def index conditions = {} conditions[:status] = params[:status] if params[:status] and !params[:status].empty? conditions[???] = ["(descr = ? or title = ?)", params[:q], params[:q]] if params[:q] and !params[:q].empty? @items = Item.find(:all, :conditions => conditions) end Unfortunately, it doesn't look like I can mix the two types of conditions (the hash and the paramatized version). Is there a "Rails Way" of doing this or do I simply have to do something awful like this: has_status = params[:status] and !params[:status].empty? has_text = params[:q] and !params[:q].empty? if has_status and !has_text # build paramatized condition with just the status elsif has_text and !has_status # build paramatized condition with just the text query elsif has_text and has_status # build paramatized condition with both else # build paramatized condition with neither end I'm migrating from Hibernate and Criteria so forgive me if I'm not thinking of this correctly... Environment: Rails 2.3.4

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  • How to allow three optional parameters in the URL by .htaccess?

    - by eij
    I have http://example.com and a PHP routing class that checks if some URL exists. I want to make a new route, which is: http://example.com/foo/bar/123 but as long as I open it, the Apache redirects me to an error page. So I'm using a .htaccess. The code is: RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*) /index.php [L] and it works, as long as I use http://example.com/foo, but once I add some other parameters, it redirects me to an error. I'm guessing that the rewrite code is wrong. Is it wrong? If yes, could you suggest me the good one? If no, where the problem could be located?

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  • Visual Studio &amp; TFS &ndash; List of addins, extensions, patches and hotfixes &ndash; Latest and Greatest

    - by terje
    This post is a list of the addins and extensions we (I ) recommend for use in Inmeta.  It’s coming up all the time – what to install, where are the download sites, etc etc, and thus I thought it better to post it here and keep it updated. The basics are Visual Studio 2010 connected to a Team Foundation Server 2010.  The edition of Visual Studio I use is the Ultimate Edition, but as many stay with the Premium Edition I’ve marked the extensions which only works with the Ultimate with a . I’ve also split the group into Recommended (which means Required) and Optional (which means Recommended) and Nice to Have (which means Optional) .   The focus is to get a setup which can be used for a complete coding experience for the whole ALM process.  The Code Gallery is found either through the Tools/Extension Manager menu in Visual Studio or through this link. The ones to really download is the Recommended category.  Then consider the Optional based on your needs.  The list of course reflects what I use for my work , so it is by no means complete, and for some of the tools there are equally useful alternatives.  The components directly associated with Visual Studio from Microsoft should be common, see the Microsoft column.     Product Available on Code Gallery Latest Version License Rec/Opt/N2H Applicable to Microsoft TFS Power Tools Sept 2010 Complete setup msi on link, split into parts on CG Sept 2010 Free Recommended TFS integration Yes Productivity Power Tools Yes 10.0.11019.3 Free Recommended Coding Yes Code Contracts No 1.4.30903 Free Recommended Coding & Quality Yes Code Contracts Editor Extensions Yes 1.4.30903 Free Recommended Coding & Quality Yes VSCommands Yes 3.6.4.1 Lite version Free (Good enough) Nice to have Coding No Power Commands Yes 1.0.2.3 Free Recommended Coding Yes FeaturePack 2   No.  MSDN Subscriber download under Visual Studio 2010 FP2 Part of MSDN Subscription Recommended Modeling & Testing Yes ReSharper No (Trial only) 5.1.1 Licensed Recommended Coding & Quality No dotTrace No 4.0.1 Licensed Optional Quality No NDepends No (Trial only) Licensed Optional Quality No tangible T4 editor Yes 1.950 Lite version Free (Good enough) Optional Coding (T4 templates) No Reflector No (Trial of Pro version only) 6.5 Lite version Free (Good enough) Recommended Coding/Investigation No LinqPad No 4.26.2 Licensed Nice to have Coding No Beyond Compare No 3.1.11 Licensed Recommended Coding/Investigation No Pex and Moles No (Moles available alone on CG) . Complete on MSDN Subscriber download under Visual Studio 2010 0.94.51023 Part of MSDN Subscription Optional Coding & Unit Testing Yes ApexSQL No Licensed Nice to have SQL No                 Some important Patches, upgrades and fixes Product Date Information Rec/Opt Applicable to Scrolling context menu KB2345133 and KB2413613 October 2010 Here Recommended Visual Studio MTM Patch October 2010 Here and here  KB2387011 Recommended (if you use MTM) MTM Data warehouse fix June 2010 Iteration dates fails with SQL 2008 R2.  KB2222312. Affects Burndown chart in Agile workbook Only for SQL 2008 R2 Server Upgrade 2008 to 2010 issue and hotfix August 2010 Fixes problems with labels and branches which are lost during upgrade. Apply before upgrade. Note: This has been fixed in the latest re-release of the TFS Server dated Aug 5th 2010. See here. Recommends downloading the latest bits. Only if upgrade from 2008 from earlier bits Server

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  • SQL SERVER – CTE can be Updated

    - by Pinal Dave
    Today I have received a fantastic email from Matthew Spieth. SQL Server expert from Ohio. He recently had a great conversation with his colleagues in the office and wanted to make sure that everybody who reads this blog knows about this little feature which is commonly confused. Here is his statement and we will start our story with Matthew’s own statement: “Users often confuse CTE with Temp Table but technically they both are different, CTE are like Views and they can be updated just like views.“ Very true statement from Matthew. I totally agree with what he is saying. Just like him, I have enough, time came across a situation when developers think CTE is like temp table. When you update temp table, it remains in the scope of the temp table and it does not propagate it to the table based on which temp table is built. However, this is not the case when it is about CTE, when you update CTE, it updates underlying table just like view does. Here is the working example of the same built by Matthew to illustrate this behavior. Check the value in the base table first. USE AdventureWorks2012; -- Check - The value in the base table is updated SELECT Color FROM [Production].[Product] WHERE ProductNumber = 'CA-6738'; Now let us build CTE with the same data. ;WITH CTEUpd(ProductID, Name, ProductNumber, Color) AS( SELECT ProductID, Name, ProductNumber, Color FROM [Production].[Product] WHERE ProductNumber = 'CA-6738') Now let us update CTE with following code. -- Update CTE UPDATE CTEUpd SET Color = 'Rainbow'; Now let us check the BASE table based on which the CTE was built. -- Check - The value in the base table is updated SELECT Color FROM [Production].[Product] WHERE ProductNumber = 'CA-6738'; That’s it! You can update CTE and it will update the base table. Here is the script which you should execute all together. USE AdventureWorks2012; -- Check - The value in the base table is updated SELECT Color FROM [Production].[Product] WHERE ProductNumber = 'CA-6738'; -- Build CTE ;WITH CTEUpd(ProductID, Name, ProductNumber, Color) AS( SELECT ProductID, Name, ProductNumber, Color FROM [Production].[Product] WHERE ProductNumber = 'CA-6738') -- Update CTE UPDATE CTEUpd SET Color = 'Rainbow'; -- Check - The value in the base table is updated SELECT Color FROM [Production].[Product] WHERE ProductNumber = 'CA-6738'; If you are aware of such scenario, do let me know and I will post this on my blog with due credit to you. Reference: Pinal Dave (http://blog.sqlauthority.com)Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQL View, T SQL Tagged: CTE

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  • The People Who Support Linux

    <b>Linux.com: </b>"The Linux Foundation's individual members help to support the work of Linux creator Linus Torvalds and other important activities that advance Linux, while getting a variety of other fun and valuable benefits. The series begins with Matthew Fernandez, a senior application developer based in Sydney, Australia. Matthew has been using Linux since 2001 and just recently became a Linux Foundation member."

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  • TechDays 2010: What’s New On C# 4.0

    - by Paulo Morgado
    I would like to thank those that attended my session at TechDays 2010 and I hope that I was able to pass the message of what’s new on C#. For those that didn’t attend (or did and want to review it), the presentation can be downloaded from here. Code samples can be downlaoded from here. Here’s a list of resources mentioned on the session: The evolution of C# The Evolution Of C# Covariance and contravariance  C# 4.0: Covariance And Contravariance In Generics Covariance And Contravariance In Generics Made Easy Covarince and Contravariance in Generics Exact rules for variance validity Events get a little overhaul in C# 4, Afterward: Effective Events Named and optional arguments  Named And Optional Arguments Alternative To Optional Arguments Named and Optional Arguments (C# Programming Guide) Dynamic programming  Dynamic Programming C# Proposal: Compile Time Static Checking Of Dynamic Objects Using Type dynamic (C# Programming Guide) Dynamic Language Runtime Overview COM Interop Improvements COM Interop Improvements Type Equivalence and Embedded Interop Types Conclusion Visual C# Developer Center Visual C# 2010 Samples C# Language Specification 4.0 .NET Reflector LINQPad

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  • Should I add parameters to instance methods that use those instance fields as parameters?

    - by john smith optional
    I have an instance method that uses instance fields in its work. I can leave the method without that parameters as they're available to me, or I can add them to the parameter list, thus making my method more "generic" and not reliable on the class. On the other hand, additional parameters will be in parameters list. Which approach is preferable and why? Edit: at the moment I don't know if my method will be public or private. Edit2: clarification: both method and fields are instance level.

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  • What is the diffference between "data hiding" and "encapsulation"?

    - by john smith optional
    I'm reading "Java concurrency in practice" and there is said: "Fortunately, the same object-oriented techniques that help you write well-organized, maintainable classes - such as encapsulation and data hiding -can also help you crate thread-safe classes." The problem #1 - I never heard about data hiding and don't know what it is. The problem #2 - I always thought that encapsulation is using private vs public, and is actually the data hiding. Can you please explain what data hiding is and how it differs from encapsulation?

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  • A way to return multiple return values from a method: put method inside class representing return value. Is it a good design?

    - by john smith optional
    I need to return 2 values from a method. My approach is as follows: create an inner class with 2 fields that will be used to keep those 2 values put the method inside that class instantiate the class and call the method. The only thing that will be changed in the method is that in the end it will assign those 2 values to the fields of the instance. Then I can address those values by referencing to the fields of that object. Is it a good design and why?

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  • How to efficiently protect part of an application with a license

    - by Patrick
    I am working on an application that has many functional parts. When a customer buys the application, he buys the standard functionality, but he can also buy some additional elements of the application for an additional price. All of the elements are part of the same application executable. A license key is used to indicate which of the elements should be accessible in the application. Some of the elements can be easily disabled if the user didn't pay for it. These are typically the modules that you can access via the application's menu. However, some elements give more problems: What if a part of the data model is related to an optional part? Do I build up these data structures in my application so the rest of my application can just assume they're always there? Or do I don't build them, and add checks in the rest of may application? What if some optional part is still useful to perform some internal tasks, but I don't want to expose it to the user externally? What if the marketing responsible wants to make a standard part now an optional part? In all of my application I assume that that part is present, but if it becomes optional, I should add checks on it everywhere in the application. I have some ideas on how to solve some of the problems (e.g. interfaces with dual implementations: one working implementation, and one that is activated if the optional part is not activated). Do you know of any patterns that can be used to solve this kind of problem? Or do you have any suggestions on how to handle this licensing problem? Thanks.

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