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  • Declarative JDOQL vs Single-String JDOQL : performance

    - by DrDro
    When querying with JDOQL is there a performance difference between using the declarative version and the Single-String version: Example from the JDOQL doc: //Declarative JDOQL : Query q = pm.newQuery(org.jpox.Person.class, "lastName == \"Jones\" && age < age_limit"); q.declareParameters("double age_limit"); List results = (List)q.execute(20.0); //Single-String JDOQL : Query q = pm.newQuery("SELECT FROM org.jpox.Person WHERE lastName == \"Jones\"" + " && age < :age_limit PARAMETERS double age_limit"); List results = (List)q.execute(20.0); Other then performance, are there any reasons for which one is better to use then the other or is it just about the one with which we feel more comfortable.

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  • review on django book vs django tutorial

    - by momo
    going through both the django book and tutorial, am a bit confused to the differences in approach (aren't they both written by the same people?) can anyone who has experience in both give a short review on them? i have decent python skills (largely untested though), but no experience at all in web apps and am trying to decide which one to stick to. i briefly looked in to practical django projects but that was a bit too complicated for me, my background is primarily bash scripting, the python i know i learned from an instant hacking tutorial and diving into python.

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  • ArrangeOverride Vs Storyboard Animation

    - by user275561
    Now I may not grasp the idea or this could be a mistake so feel free to correct me. I am doing a bubble breaker game in Silverlight. So when a bubble in a column gets bursted. I want to animate the above bubbles to simulate that they are being dropped. Each bubble knows its Row and column location and that gets updated in the View Model. Now my question is, Should I call invalidateArrange() on the Canvas from the ViewModel so it rearranges the bubbles or just have a storyboard animate the TranslateY. In my arrangeOverride Method I have something like this Rect childBounds = new Rect(CalculateLeft(dataContext.Column), CalculateTop(dataContext.Row), BubbleSize, BubbleSize); child.Arrange(childBounds); If there is a better way let me know. I am trying to learn the best practices.

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  • fonts mac vs pc

    - by Kieran
    Hi all hope your having a good day/evening. Simple question, but maybe not so simple to answer. I have an unordered list, which i am using as a menu. The list items are floated right and sized due to an anchor tag inside them with a roll over. The last element is given a specific size to suck up any extra space. See the code snippits bellow. css ul.mainNav { width: 970px; display:block; background:black; clear:both; overflow:hidden;} ul.mainNav li { float: left; height:29px;} ul.mainNav li a { display: block; padding:7px 19px; color:#ffffff; background-color:#000; font-weight:bold; text-decoration:none; font-size:13px; } ul.mainNav li a:hover, ul.mainNav li a.selected { background-color:#ffff00; color:#000; } ul.mainNav li a.last{ text-align:center; padding: 7px 19px; width:58px;} html <ul class="mainNav" id="mainNav"> <li><a href="/Default.aspx">home</a></li> <li><a href="/About/">about</a></li> <li><a href="/News/">news</a></li> <li><a href="/Enter/Registration.aspx">enter SOYA 2010</a></li> <li><a href="/Categories/Film.aspx">categories</a></li> <li><a href="/Mentors/janChapman.aspx">mentors</a></li> <li><a href="/PastWinners/">past winners</a></li> <li><a href="/Awards/">awards nights</a></li> <li><a href="/Support/" class="last">contact</a></li> </ul> It is containted in a <div style="margin:0 auto;">...</div> to center on the menu on screen Now my problem is: On PC; firefox/ Safari /IE /Chrome are all displaying correctly. Take the same code to a Mac; Safari/ firefox are displaying the menu to be too short and the only thing i can point to is that the fonts may be smaller in widths. The width is currently set to 970px. My question is: How can i get it to display at the same widths without specifying exact widths for each list item? Any help would be appreciated. If my structure is wrong or it is just a mac thing that i will never solve(hope not). Cheers, KJ

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  • ECM (Niche Vs Mass Market)

    - by Luj Reyes
    Hi Everyone, I recently started a little company with a couple of guys. Ours is the typical startup, a lot of ideas, dreams, talent and work hours :P. Our initial business plan was to develop a DM (Document Manager) with several features found on DropBox and other tools but with a big differentiator. Then we got in the team this Business Guy (I must say that several of us could be called 'Business Guys' but we are mainly hackers, he is just Another 'Networking Guy'), and along with him came this market analysis for a DM aimed at a very specific and narrow niche. We have many elements to believe in his market study and the idea is the classic "The market is X million, so if we grab a 10%...", and the market is really there to grab because all big providers deemed it too little and fled, let's say that the market is 5 million USD and demand very specific features. If we decide to go for this niche product we face a sales cycle of about 7 months, and the main goal of these revenue is to develop more ambitious projects. (Institutional VC is out of the question if you want to keep a marginal ownership of your company in my country). The only overlap between the niche and the mass market product features is the ability to store documents; everything else requires that we focus all of our efforts towards one or the other. I've studied a lot about the differences between Mass and Niche Markets, but I want to hear from people with actual experience. So everything comes down to this: If you have a really “saleable” idea what is the right thing to do: to go for the niche or go for the big prize and target primarily the mass market? Thanks for your input

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  • WPF Binding XAML vs C#

    - by kubal5003
    Hello, I've got a strange problem - binding created through XAML (both ways by markup extension or normal) isn't working(BindingOperations.IsDataBound returns false and in fact there is no Binding object created). When I do literally the same from code everything is working perfectly. One more thing is that the Binding in XAML is created in a DataTemplate - what's funny about that when I use the DataTemplate for the first time it fails, then I fix it from code (add binding to specific objects) and while adding more objects to the collection the binding set in XAML just works. If I try to remove all the objects from the collection and then add a new one the binding fails once again. In reality this is a shortened version of another of my questions. For details please refer to: http://stackoverflow.com/questions/2986511/wpf-debugging-avalonedit-binding-to-document-property Sorry for doing it this way, but there's no answer and it's probably too long for anybody to read. -

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  • C# Threading vs single thread

    - by user177883
    Is it always guaranteed that a multi-threaded application would run faster than a single threaded application? I have two threads that populates data from a data source but different entities (eg: database, from two different tables), seems like single threaded version of the application is running faster than the version with two threads. Why would the reason be? when i look at the performance monitor, both cpu s are very spikey ? is this due to context switching? what are the best practices to jack the CPU and fully utilize it? I hope this is not ambiguous.

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  • xml vs java LinearLayout fills

    - by user293443
    the xml version below properly handles height and width and the java doesn't what is the java missing? xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="fill_parent" android:layout_width="fill_parent" android:orientation="horizontal"> <include android:id="@+id/cell1" layout="@layout/grid_text_view" /> <include android:id="@+id/cell2" layout="@layout/grid_text_view" /> </LinearLayout> java LinearLayout ll = new LinearLayout(this); ll.setOrientation(LinearLayout.HORIZONTAL); ll.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT)); ll.addView((TextView)this.getLayoutInflater().inflate(R.layout.grid_text_view, null)); ll.addView((TextView)this.getLayoutInflater().inflate(R.layout.grid_text_view, null)); setContentView(ll); grid_text_view <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="fill_parent" android:layout_width="0dip" android:text="1" android:textSize="20sp" android:gravity="center" android:layout_weight="1" /> I've tried a ll.invalidate() and it didn't work either? :( screenshots at http://www.flickr.com/photos/48409507@N06/sets/72157623618407586/

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  • Is VS 2010 SharePoint functionality good enough to replace WSP Builder?

    - by JL
    I have been using WSP builder up until now with VS 2008. I recently upgraded my IDE to VS 2010, and have heard that VS 2010 now includes functionality to work with MOSS directly. If you guys have had any experience with this new MOSS functionality and have come from a WSP builder background I would like to hear what you think. Just to add more focus to my question, I am not interested in ease of deployment at this stage, only the ability to wrap up a WSP package, so I can ship this off to production machines. So can VS 2010 out of the box create WSP packages from class library projects, like WSP Builder does?

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  • Core Data Inferred Migration – Automatic "lightweight" vs Manual

    - by ohhorob
    I've updated the model of an existing iPhone app in some simple ways (remove attribute, add attribute, remove index), and can use automatic lightweight migration to migrate the persistent store. Due to the typical size of the data set, the processing time is not insignificant, and warrants feedback for the user. NSMigrationManager provides a simple but useful migrationProgress value that sends KVO notifications as the migration is performed. That forms the basis of providing feedback, however attempting to use an inferred model ([NSMappingModel inferredMappingModelForSourceModel:destinationModel:error:]) results in drastically different timing for the exact same dataset. Profile results on and original iPhone (2G) Automatic inferred lightweight migration PROFILE: CacheManager -migrateStore PROFILE: 0.6130 (+0.6130) models loaded PROFILE: 1.1759 (+0.5629) delegate -CacheManagerWillMigrate: PROFILE: 1.2516 (+0.0757) persistent store coordinator loaded PROFILE: 5.1436 (+3.8920) automatic lightweight migration completed PROFILE: 5.5435 (+0.3999) delegate -CacheManagerDidFinishMigration:withError: Manual inferred migration PROFILE: CacheManager -migrateStore PROFILE: 0.6660 (+0.6660) models loaded PROFILE: 1.1471 (+0.4811) inferred mapping model generated PROFILE: 1.4046 (+0.2574) delegate -CacheManagerWillMigrate: PROFILE: 1.5058 (+0.1013) persistent store coordinator loaded PROFILE: 22.6952 (+21.1894) manual migration completed PROFILE: 23.1478 (+0.4525) delegate -CacheManagerDidFinishMigration:withError: So, with an inferred model, the manual migration takes over 5 times longer than automatic! It's a big inconsistency, and the lightweight option that NSPersistentStoreCoordinator -addPersistentStoreWithType:configuration:URL:options:error: provides absolutely no indication of progress while processing. Can anybody provide a supported way to get the migrationProgress values during automatic migration, OR a way to configure an inferred mapping model to be as fast during manual processing as automatic?

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  • Grails: Services VS Groovy classes

    - by Olexandr
    Documentation says: The Grails team discourages the embedding of core application logic inside controllers, as it does not promote re-use and a clean separation of concerns. I have one API controller and a few Groovy classes in src/groovy folder. Those classes just implements my application logic so actions in API controller works in this way: //index page def index = { render new IndexApi().index(params) as JSON } I'm curious - is there any reason to move my application logic from plain groovy classes into services ?

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  • subreport with image not display data in crystal report asp .net vs 2005

    - by user361014
    I currently have a crystal report that generating in Visual Studio 2005 which has a sub-report. I've linked the sub-report to dataset and dataset has one table call image and it contain column system.byte[]. main report link to another dataset . main report has parameters and sub report has only image field. but when run main report display data but sub report don't display. no error message. sub report dataset not pass data to report. anyone have any idea what might be causing the sub-reports to not work??

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  • Generics vs inheritance (whenh no collection classes are involved)

    - by Ram
    This is an extension of this questionand probably might even be a duplicate of some other question(If so, please forgive me). I see from MSDN that generics are usually used with collections The most common use for generic classes is with collections like linked lists, hash tables, stacks, queues, trees and so on where operations such as adding and removing items from the collection are performed in much the same way regardless of the type of data being stored. The examples I have seen also validate the above statement. Can someone give a valid use of generics in a real-life scenario which does not involve any collections ? Pedantically, I was thinking about making an example which does not involve collections public class Animal<T> { public void Speak() { Console.WriteLine("I am an Animal and my type is " + typeof(T).ToString()); } public void Eat() { //Eat food } } public class Dog { public void WhoAmI() { Console.WriteLine(this.GetType().ToString()); } } and "An Animal of type Dog" will be Animal<Dog> magic = new Animal<Dog>(); It is entirely possible to have Dog getting inherited from Animal (Assuming a non-generic version of Animal)Dog:Animal Therefore Dog is an Animal Another example I was thinking was a BankAccount. It can be BankAccount<Checking>,BankAccount<Savings>. This can very well be Checking:BankAccount and Savings:BankAccount. Are there any best practices to determine if we should go with generics or with inheritance ?

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  • SQL (MySQL) vs NoSQL (CouchDB)

    - by christopher-mccann
    I am in the middle of designing a highly-scalable application which must store a lot of data. Just for example it will store lots about users and then things like a lot of their messages, comments etc. I have always used MySQL before but now I am minded to try something new like couchdb or similar which is not SQL. Does anyone have any thoughts or guidance on this?

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  • Assembly Jump conditionals -- jae vs. jbe

    - by Raven Dreamer
    Hi, all! I'm working on an assembly program (intel 8086). I'm trying to determine whether an input character (stored in dl) is within a certain range of hex values. cmp dl, 2Eh ;checks for periods je print ;jumps to print a "." input cmp dl, 7Ah ;checks for outside of wanted range jae input ; returns to top Please confirm that this is a correct interpretation of my code: step 1: if dl = 2E, goto print Step 2: if dl = 7A is false, goto input [if dl < 7A, goto input]

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  • HtmlAgilityPack - Vs 2010 - c# ASP - File Not found

    - by Janosch Geigowskoskilu
    First, I've already searched the web & StackOverflow for hours, and i did find a lot about troubleshooting HtmlAgilityPack and tried most of these but nothing worked. The Situation: I'm developing a C# ASP .NET WebPart in SharePoint Foundation. Everything works fine, now I want to Parse a HTML Page to get all ImagePaths and save the Images on HD/Temp. To do that I was downloading HtmlAgilityPack, current version, add reference to Project, everything looks OK, IntelliSense works fine. The Exception: But when I want to run the section where HtmlAgilityPack should be used my Browser shows me a FileNotFoundException - The File or Assembly could not be found. What I tried: After first searches i tried to include v1.4.0 of HtmlAgilityPack cause I read that the current version in some case is not really stable. This works fine to until the point I want to use HtmlAgilityPack, the same Exception. I also tried moving the HtmlAgilityPack direct to the Solution directory, nothing changed. I tried to insert HtmlAgilityPack via using and I tried direct call e.g. HtmlAgilityPack.HtmlDocument. Conclusion : When I compile no error occurs, the reference is set correct. When I trace the HtmlAgilityPack.dll with ProcMon the Path is shown correct, but sometimes the Result is 'File Locked with only Readers' but I don't know enough about ProcMon to Know what this means or if this is critical. It couldn't have something to do with File Permissions because if I check the DLL the permissions are all given.

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  • best practice to obtain time zone for iPhone vs iPod Touch

    - by johnbdh
    I am creating an app that requires the users current time zone. If the device being used is an iPhone and the user has their Time Zone set to automatically change, I think I can be fairly confident that localTimeZone or systemTimezone will give me the correct time zone for the user's location. If on the other hand the device is an iPod Touch, the time zone returned by localTimeZone and systemTimeZone appears to always be whatever time zone is set in the Date & Time settings, regardless of the user's actual location. I tried using location services but, while the lat/long is being provided properly, the time zone offset in the timesStamp I am getting is always the same as whatever the user has set for their time zone setting. Any suggestions? John

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  • Silverlight vs ASP.NET for Business?

    - by Sahat
    Which of these two technologies has bigger demand today? I have plenty of free time this summer so I was thinking of learning either ASP.NET or Silverlight 4, and get an internship this coming Fall. If you've read my other question here on SO "Financial Market Developer Dilemma" then you already know that I am planning to work in the financial industry a few years from now. So my questions are: Which technology would benefit me more in the long term: Silverlight or ASP.NET? Which one pays more $$$? Which one has higher demand? What is the learning curve like for ASP.NET and Silverlight? Thanks in advance!

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  • Entity Framework vs LINQ to SQL

    - by Chris Roberts
    Now that .NET v3.5 SP1 has been released (along with VS2008 SP1), we now have access to the .NET entity framework. My question is this. When trying to decide between using the Entity Framework and LINQ to SQL as an ORM, what's the difference? The way I understand it, the Entity Framework (when used with LINQ to Entities) is a 'big brother' to LINQ to SQL? If this is the case - what advantages does it have? What can it do that LINQ to SQL can't do on its own?

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  • Char* vs std::string

    - by Lockyer
    Is there any advantage to using char*'s instead of std::string? I know char*'s are usually defined on the stack, so we know exactly how much memory we'll use, is this actually a good argument for their use? Or is std::string better in every way?

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