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• dtd vs xsd, which one to choose?

  - by noname

  i want to use one of these to describe my xml document. i've read that xsd is better than the older dtd since it supports namespaces and data types. does this mean that i should only use xsd for all future needs and totally ignore dtd and don´t even have to bother learning its structure?

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• Singleton design pattern vs Singleton beans in Spring container

  - by Peeyush

  As we all know we have beans as singleton by default in Spring container and if we have a web application based on Spring framework then in that case do we really need to implement Singleton design pattern to hold global data rather than just creating a bean through spring. Please bear with me if I'm not able to explain what I actually meant to ask.

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• Multi-statement Table Valued Function vs Inline Table Valued Function

  - by AndyC

  ie: CREATE FUNCTION MyNS.GetUnshippedOrders() RETURNS TABLE AS RETURN SELECT a.SaleId, a.CustomerID, b.Qty FROM Sales.Sales a INNER JOIN Sales.SaleDetail b ON a.SaleId = b.SaleId INNER JOIN Production.Product c ON b.ProductID = c.ProductID WHERE a.ShipDate IS NULL GO versus: CREATE FUNCTION MyNS.GetLastShipped(@CustomerID INT) RETURNS @CustomerOrder TABLE (SaleOrderID INT NOT NULL, CustomerID INT NOT NULL, OrderDate DATETIME NOT NULL, OrderQty INT NOT NULL) AS BEGIN DECLARE @MaxDate DATETIME SELECT @MaxDate = MAX(OrderDate) FROM Sales.SalesOrderHeader WHERE CustomerID = @CustomerID INSERT @CustomerOrder SELECT a.SalesOrderID, a.CustomerID, a.OrderDate, b.OrderQty FROM Sales.SalesOrderHeader a INNER JOIN Sales.SalesOrderHeader b ON a.SalesOrderID = b.SalesOrderID INNER JOIN Production.Product c ON b.ProductID = c.ProductID WHERE a.OrderDate = @MaxDate AND a.CustomerID = @CustomerID RETURN END GO Is there an advantage to using one over the other? Is there certain scenarios when one is better than the other or are the differences purely syntactical? I realise the 2 example queries are doing different things but is there a reason I would write them in that way? Reading about them and the advantages/differences haven't really been explained. Thanks

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• iterator vs reverse_iterator

  - by Miguel Angel

  Hi, I'm using std::map to store a lot of elements (pairs of elements) and I have a "little" doubt, what is more efficient to iterate all elements over my std::map, iterator or reverse_iterator? Thank's. Salu2.

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• Proxy problems when adding Service Reference in VS 2010

  - by DanyW

  Hi everyone, I was able to add a Service Reference in VS2008 with no problems at all. However, on the same machine within the same network, I couldn't do that in VS2010. It got a (407) response, Proxy Authentication Required. Has anyone else encountered this problem before? Are there new settings in VS2010 that need tweaking? Thanks, D.

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• boost serialization vs google protocol buffers?

  - by 0xC0DEFACE

  Does anyone with experience with these libraries have any comment on which one they preferred? Were there any performance differences or difficulties in using?

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• IE8 CSS and html vs IE7

  - by 08Hawkeye

  Pardon any brashness here, I'm about at my wits end looking for answers. I am looking for a list (if one exists) or some resource guide of specific html and css tags that have changed from IE7 to IE8. Specifically, I want to see something like "this code works in IE7 but not IE8... here is the broken tag's equivalent to make IE8 work." I do NOT [begin frustration rant] want to hear anything about the meta x-ua-compatibility work around to put in my header. We are FIXING our app for IE8, not putting on a band-aid. Thanks in advance! //sw

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• MySQL performance - 100Mb ethernet vs 1Gb ethernet

  - by Rob Penridge

  Hi All I've just started a new job and noticed that the analysts computers are connected to the network at 100Mbps. The ODBC queries we run against the MySQL server can easily return 500MB+ and it seems at times when the servers are under high load the DBAs kill low priority jobs as they are taking too long to run. My question is this... How much of this server time is spent executing the request, and how much time is spent returning the data to the client? Could the query speeds be improved by upgrading the network connections to 1Gbps? (Updated for the why): The database in question was built to accomodate reporting needs and contains massive amounts of data. We usually work with subsets of this data at a granular level in external applications such as SAS or Excel, hence the reason for the large amounts of data being transmitted. The queries are not poorly structured - they are very simple and the appropriate joins/indexes etc are being used. I've removed 'query' from the Title of the post as I realised this question is more to do with general MySQL performance rather than query related performance. I was kind of hoping that someone with a Gigabit connection may be able to actually quantify some results for me here by running a query that returns a decent amount of data, then they could limit their connection speed to 100Mb and rerun the same query. Hopefully this could be done in an environment where loads are reasonably stable so as not to skew the results. If ethernet speed can improve the situation I wanted some quantifiable results to help argue my case for upgrading the network connections. Thanks Rob

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• Application threads vs Service threads

  - by zerayaqob

  What are the advantages/disadvantages in placing a lengthy network access code in a thread in an activity or a thread in a service? How would it affect the application? I am writing a streaming audio player and from what I've read so far putting the code in a service will still end up blocking the application so a new thread is needed, does anyone know if it makes more sense to put this piece of code in a service. Thanks

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• Servlets vs MVC frameworks

  - by Jegan

  I very often come across this question of why we have got lots of web frameworks addressing the same or similar drawbacks. When looking deeply, I also have given thought on why JSP / Servlets is not being used after the other web frameworks (like Struts, Spring MVC etc) have shown their existence? Is it because, the latest web frameworks does most of the things on its own? provides extensive features that is not available with Servlet / JSP? or the Servlet / JSP is impotent to deliver what latest framework does? Any help in the form of responses or resources is greatly appreciated.

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• iPhone Development - CLLocationManager vs. MapKit

  - by Mustafa

  If i want to show userLocation on the map, and at the same time record the user's location, is it a good idea to add an observer to userLocation.location and record the locations, OR should i still use CLLocationManager for recording user location and use mapView.showUserLocation to show the user's current location (blue indicator)? I want to show the default blue indicator supported by the MapKit API. Also, here's a rough sample code: - (void)viewDidLoad { ... locationManager = [[CLLocationManager alloc] init]; locationManager.desiredAccuracy = kCLLocationAccuracyBest; locationManager.distanceFilter = DISTANCE_FILTER_VALUE; locationManager.delegate = self; [locationManager startUpdatingLocation]; myMapView.showUserLocation = YES; [myMapView addObserver:self forKeyPath:@"userLocation.location" options:0 context:nil]; ... } - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { // Record the location information // ... } - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { NSLog(@"%s begins.", __FUNCTION__); // Make sure that the location returned has the desired accuracy if (newLocation.horizontalAccuracy <= manager.desiredAccuracy) return; // Record the location information // ... } Under the hood, i think MKMapView also uses CLLocationManager to get user's current location? So, will this create any problems because i believe both CLLocationManager and MapView will try to use same location services? Will there be any conflicts and lack of accurate/required or current data?

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• Blog - BlogPost - BlogPostComment vs Blog - Post - Comment

  - by Anton Gogolev

  Don't really know how to formulate the title, but it should be pretty obvious from the example. More specifically, what rules do you use for naming "dependent" classes. For example, Blog is a pretty descriptive name itself, but how do I deal with posts? BlogPost or Post? Clearly, first name clearly expresses that it's a "subordinate" class, but this can quickly get out of hand with BlogPostComment, BlogPostCommentAttachment, etc. Post, on the other hand, looks like an entity completely unrelated to Blog and is easier on the eye. What are your rules/best practices?

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• WCF Vs Web Services

  - by Ben

  Hi, I am about to re-release my website that i have transformed into a SilverLight Site, and was wondering if it is worth while updating the web service that it hosts into a WCF Service. The Service doesn't do too much at the moment, but i will be growing it fairly substantially. I have read a few articles on the differences between asmx web services and WCF Services and can't really see the benefits of WCF, but i am probably very wrong. Could anyone advise of the advantages of WCF and if is worth while me making the move (on the basis that you know it's a small service at the moment, but will be growing). Thanks

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• Indexing vs. no indexing when inserting records

  - by jbu

  I have a few questions about whether or not it would be best to not use indexing. BACKGROUND: My records have a timestamp attribute, and the records will be inserted in order of their timestamps (i.e., inserted chronologically). QUESTIONS: If I DON'T use indexing is it typical for the database to insert the records in the order that they were inserted? If answer to #1 is yes, when I do a "SELECT .. WHERE timestamp X" type query will the database be efficient at it, or will it have to go through every single record since it isn't indexed? I would assume if there were no index, the database would not "know" that the records were inserted in sorted order and could not, therefore, make use of sorted property of the database. I assume a clustered index would be best for these types of records & their inserts. Please let me know what you guys think. Thanks, jbu

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• WPF vs XNA to render thousands of sprites

  - by Aurélien Ribon

  Hello, I need to render thousand of ellipses linked each others with lines. What would be the best way (in terms of performances) to render it inside a WPF application. Is WPF Canvas painting a lot worse than XNA painting ? Thanks, Aurélien

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• Optimize css vs Google page speed is messing with me

  - by The Disintegrator

  I'm using google page speed and it's telling me my css is inefficient... Very inefficient rules (good to fix on any page): * table.fancy thead td Tag key with 2 descendant selectors and Class overly qualified with tag * table.fancy tfoot td Tag key with 2 descendant selectors and Class overly qualified with tag The css rules are table.fancy {border: 1px solid white; padding:5px} table.fancy td {background:#656165} table.fancy thead td, table.fancy tfoot td {background:#767276} I want the header and footer in a different background color than the body of the table (a data table) On what grounds this is inefficient? How to make it more efficient? I will not add a class to the thead and tfoot for googles's sake.

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• FileSystemWatcher vs Polling to watch for changes

  - by Jon Tackabury

  I need to setup an application that watches for files being created in a folder (locally or on a network drive) and I was wondering if anyone has any thoughts on whether the FileSystemWatcher or polling on a timer would be the best option. I have used both methods in the past, but not extensively. Have you run into any issues (performance, reliability... etc) with either method? I know there isn't a "right way" to do this, I'm just looking opinions.

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• UIView animation VS core animation

  - by Tom Irving

  I'm trying to animate a view sliding into view and bouncing once it hits the side of the screen. A basic example of the slide I'm doing is as follows: // The view is added with a rect making it off screen. [UIView beginAnimations:nil context:NULL]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationDuration:0.07]; [UIView setAnimationCurve:UIViewAnimationCurveLinear]; [UIView setAnimationDelegate:self]; [UIView setAnimationDidStopSelector:@selector(animationDidStop:finished:context:)]; [theView setFrame:CGRectMake(-5, 0, theView.frame.size.width, theView.frame.size.height)]; [UIView commitAnimations]; More animations are then called in the didStopSelector to make the bounce effect. The problem is when more than one view is being animated, the bounce becomes jerky and, well, doesn't bounce anymore. Before I start reading up on how to do this in Core Animation, (I understand it's a little more difficult) I'd like to know if there is actually an advantage using Core Animation rather than UIView animations. If not, is there something I can do to improve performance?

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• Symbian bluetooth vs. Windows Mobile bluetooth

  - by qwerty

  Hello, I wanna know what are the differences between Symbian OS bluetooth and Windows Mobile bluetoo? Can you explain/describe me? I did not find something clear in this case.. i wanna compare them. Thanks!

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• MySQL query performance - 100Mb ethernet vs 1Gb ethernet

  - by Rob Penridge

  Hi All I've just started a new job and noticed that the analysts computers are connected to the network at 100Mbps. The queries we run against the MySQL server can easily be 500MB+ and it seems at times when the servers are under high load the DBAs kill low priority jobs as they are taking too long to run. My question is this... How much of this server time is spent executing the request, and how much time is spent returning the data to the client? Could the query speeds be improved by upgrading the network connections to 1Gbps? Thanks Rob

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• Static functions vs const functions

  - by baash05

  I'm looking at a member function int funct(int x) const; And I'm wondering if static int funct(int x); would be better. If a member function doesn't use any of the member variables should it be static. Are there any things that would discourage this?

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• Java: notify() vs. notifyAll() all over again

  - by Sergey Mikhanov

  If one google for "difference between notify() and notifyAll()" then a lot of explanations will pop up (leaving apart the javadoc paragraphs). It all boils down to the number of waiting threads being waken up: one in notify() and all in notifyAll(). However (if I do understand the difference between these methods right), only one thread is always selected for further monitor acquisition; in the first case the one selected by the VM, in the second case the one selected by the system thread scheduler. The exact selection procedures for both of them (in general case) are not known to the programmer. What's is the useful difference between notify() and notifyAll() then? Am I missing something?

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• AlertDialog.Builder vs class to extend AlertDialog - Application size

  - by wuntee

  I am trying to figure out what is the best way to go about creating dialogs. I can either create my own Dialog class (which, to me, is more clean and organized), or I can use AlertDialog.Builder (which would be done inline, and funky looking)... What are the positivies and negatives of either implementation? The only thing I can think of is application size...

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• DC: Mac Developer vs iPhone Developer

  - by Khou

  http://developer.apple.com/programs/ so whats the difference between Mac Developer and iPhone Developer membership? If you signup to Mac Developer you can download the iPhone SDK anyways? so why would you sign to iphone developer?

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• Google index vs asp.net url routing

  - by vani

  I've made the change from querystring asp.net webforms application to an url routing one. Now I'm trying to let google know that there's a new set of urls to be aware of. The G has indexed 133 out of 179 new urls sent in sitemap.xml, but the site:mistral.hr command returns the old querystring version of the links. This could partly be so because I left the functionality of the old querystring version of the site(for backwards compatibility), and haven't done any 301 redirects(nor do I know how to achieve them in my shared hosting account). The old querystring and the new url routing both point to the same Default.aspx page.

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