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  • What's the difference between $get and $find in JavaScript?

    - by RoboShop
    Hi, I'm a .NET programmer who've just started to learn more about client side scripting, and I was wondering sometimes you use $get('value') and $find('value') and I've discovered that these are just shortcuts for document.getElementById('value') and Sys.Application.findComponent('value'), respectively. However, I still don't understand: what is the difference between these two functions in JavaScript? What exactly are they looking up/retrieving when invoked? Thanks in advance.

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  • What's the difference in content between the Ubuntu and Lubuntu Software Centers? Why aren't winners of the app showdown available in the latter?

    - by vasa1
    What's the difference in content between the Ubuntu and Lubuntu Software Centers? I've seen this Are softwares installable on ubuntu also installable on lubuntu? which indicates that the content should be the same. However, I looked for Ridual, OrthCal, Cuttlefish and MenuLibre. While all four are available in the Ubuntu Software Center, they aren't listed in the Lubuntu Software Center. Will they eventually be listed? Who decides? I'm asking because one of the criteria in the apps showdown, if I understood correctly, was desktop integration. If by "desktop", Unity is specifically implied then it would make sense not including them in the Lubuntu Software Center. Is that correct? I'm on 12.04.

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  • Insert or Update using Oracle and PL/SQL

    - by Shane
    I have a PL/SQL function that performs an update/insert on an Oracle database that maintains a target total and returns the difference between the existing value and the new value. Here is the code I have so far: FUNCTION calcTargetTotal(accountId varchar2, newTotal numeric ) RETURN number is oldTotal numeric(20,6); difference numeric(20,6); begin difference := 0; begin select value into oldTotal from target_total WHERE account_id = accountId for update of value; if (oldTotal != newTotal) then update target_total set value = newTotal WHERE account_id = accountId difference := newTotal - oldTotal; end if; exception when NO_DATA_FOUND then begin difference := newTotal; insert into target_total ( account_id, value ) values ( accountId, newTotal ); -- sometimes a race condition occurs and this stmt fails -- in those cases try to update again exception when DUP_VAL_ON_INDEX then begin difference := 0; select value into oldTotal from target_total WHERE account_id = accountId for update of value; if (oldTotal != newTotal) then update target_total set value = newTotal WHERE account_id = accountId difference := newTotal - oldTotal; end if; end; end; end; return difference end calcTargetTotal; This works as expected in unit tests with multiple threads never failing. However when loaded on a live system we have seen this fail with a stack trace looking like this: ORA-01403: no data found ORA-00001: unique constraint () violated ORA-01403: no data found The line numbers (which I have removed since they are meaningless out of context) verify that the first update fails due to no data, the insert fail due to uniqueness, and the 2nd update is failing with no data, which should be impossible. From what I have read on other thread a MERGE statement is also not atomic and could suffer similar problems. Does anyone have any ideas how to prevent this from occurring?

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  • better to wait Drupal 7 to start learning Drupal, or no big difference with Drupal 6?

    - by artmania
    Hi friends, I'm going to start some projects in next weeks. I currently have my custom cms, but i wanna go for opensource cms solution from now on. and as i researched Drupal is COOL for any kind of project from small scope to most complex ones. I have never used Drupal before, I know nothing about it yet. Would it worth to work on Drupal 6 for now, or better to wait for Drupal 7? is there any big difference about the way it works. i would feel silly to spend days-weeks to learn Drupal 6 now and after few months when Drupal 7 beta is out, a new learning curve and having troubles to upgrade to Drupal 7 my current Drupal 6 projects? Thanks a lot!! appreciate advises!

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  • What is the difference in WCF when using KnownType and ServiceKnownType?

    - by Paul Speranza
    I have a service that returns an array of animal but the list can contain cats, dogs, etc, which all extend animal. I know I need to use either the KnownType or ServiceKnownType attribute, and on the entity class or the service class, respectively. What is the difference between the 2 attributes? I prefer the ServiceKnownType because it is applied on the service, exactly where it is needed and called for, as opposed to KnownType which is applied on my entity. To me applying it on the entity class means knowing too far ahead how my entity class is being used. For now I have it on my entity and it works like a charm, but I am looking for guidance here as to best practices and usefullness. Thanks, Paul Speranza

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  • Is there any difference between null and 0 when assigning to pointers in unsafe code?

    - by Eloff
    This may seem odd, but in C (size_t)(void*)0 == 0 is not guaranteed by the language spec. Compilers are allowed to use any value they want for null (although they almost always use 0.) In C#, you can assign null or (T*)0 to a pointer in unsafe code. Is there any difference? (long)(void*)0 == 0 (guaranteed or not? put another way: IntPtr.Zero.ToInt64() == 0) MSDN has this to say about IntPtr.Zero: "The value of this field is not equivalent to null." Well if you want to be compatible with C code, that makes a lot of sense - it'd be worthless for interop if it didn't convert to a C null pointer. But I want to know if IntPtr.Zero.ToInt64() == 0 which may be possible, even if internally IntPtr.Zero is some other value (the CLR may or may not convert null to 0 in the cast operation) Not a duplicate of this question

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  • 3 methods for adding a "Product" through Entity Framework. What's the difference?

    - by Kohan
    Reading this MSDN article titled "Working with ObjectSet (Entity Framework)" It shows two examples on how to add a Product.. one for 3.5 and another for 4.0. http://msdn.microsoft.com/en-us/library/ee473442.aspx Through my lack of knowledge I am possibly completely missing something here, but i never added a Product like this: //In .NET Framework 3.5 SP1, use the following code: (ObjectQuery) using (AdventureWorksEntities context = new AdventureWorksEntities()) { // Add the new object to the context. context.AddObject("Products", newProduct); } //New in .NET Framework 4, use the following code: (ObjectSet) using (AdventureWorksEntities context = new AdventureWorksEntities()) { // Add the new object to the context. context.Products.AddObject(newProduct); } I would not have done it either way and just used: // (My familiar way) using (AdventureWorksEntities context = new AdventureWorksEntities()) { // Add the new object to the context. context.AddToProducts(newProduct); } What's the difference between these three ways? Is "My way" just another way of using an ObjectQuery? Thanks, Kohan

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  • Is there a difference between boost iostream mapped file and boost interprocess mapped file?

    - by Yijinsei
    I want to create a mapped binary file into memory; however I am not sure how to create the file to be mapped into the system. I read the documentation several times and realize there are 2 mapped file implementations, one in iostream and the other in interprocess. Do you guys have any idea on how to create a mapped file into shared memory? I am trying to allow a multi-threaded program to read an array of large double written in a binary file format. Also what is the difference between the mapped file in iostream and interprocess?

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  • Whats the difference between Process and ProcessStartInfo in C#?

    - by JimDel
    Whats the difference between Process and ProcessStartInfo? Ive used both to launch external programs but there has to be a reason there are two ways to do it. Here are two examples. Process notePad = new Process(); notePad.StartInfo.FileName = "notepad.exe"; notePad.StartInfo.Arguments = "ProcessStart.cs"; notePad.Start(); and ProcessStartInfo startInfo = new ProcessStartInfo(); startInfo.FileName = "notepad.exe"; startInfo.Arguments = " ProcessStart.cs "; Process.Start(startInfo) Thanks

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  • Is there any performance difference between Debug and Release?

    - by Lazlo
    I'm using MySql Connector .NET to load an account and transfer it to the client. This operation is rather intensive, considering the child elements of the account to load. In Debug mode, it takes, at most, 1 second to load the account. The average would be 500ms. In Release mode, it takes from 1 to 4 seconds to load the account. The average would be 1500ms. Since there is no #if DEBUG directive or the like in my code, I'm wondering where the difference is coming from. Is there a project build option I could change? Or does it have to do with MySql Connector .NET that would have different behaviors depending on the build mode?

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