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• What's the best free and opensource PHP ecommerce solution? (and why?)

  - by Andrea Ambu

  I'd like to avoid coding one from scratch, so I'd like to see what the open-source community can offer :-) Required features: Easy way to insert items with photo and description Templates easy-to-create Multi language (at least Italian and English) Shopping cart User managment PayPal support (not required but really appreciated :D) I'm going on PHP and MySQL because of the hosting service I can't change, so please don't talk to me about alternatives :P I'd like to know what's the one you like the most and why should it be better than the others UPDATE: I need also multi language, Italian and English are a must.

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• Why make short and long-lived objects a difference in garbage collection?

  - by DR

  I've often read that in the Sun JVM short-lived objects ("relatively new objects") can be garbage collected more efficiently than long-lived objects ("relatively old objects") Why is that so? Is that specific to the Sun JVM or does this result from a general garbage collection principle?

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• Why do we need mocking frameworks like Easymock , JMock or Mockito?

  - by Praneeth

  Hi, We use hand written stubs in our unit tests and I'm exploring the need for a Mock framework like EasyMock or Mockito in our project. I do not find a compelling reason for switching to Mocking frameworks from hand written stubs. Can anyone please answer why one would opt for mocking frameworks when they are already doing unit tests using hand written mocks/stubs. Thanks

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• mixing OpenGL and Interface Builder/ UI Controls - bad idea? Why? (iPhone)

  - by Adam

  I've heard that OpenGL ES and standard iPhone UI controls don't play well together, but I'm wondering if anyone knows why, and what the effects are? I'm writing an OpenGL based game, and the view is loaded from a nib file with ui controls, and it seems to work ok, but the game is really simple at this point... does using ui controls cause some kind of performance hit?

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• Why can't I bind visible of a control without runat=server?

  - by Matthew Jones

  In other words, why can't I do this: <a id="projectsButton" visible=<%= someFunctionWhichEvalsToFalse() ? false : true %>> </a> It seems to do nothing. I checked this by switching the false and true. What can I do about this?

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• JQUERY fadeIn - Why is it flashing the entire UL, and not the LI that is being appened?

  - by nobosh

  Given the following: $("#taglist").append('<li><a href="">' + v + '</a></li>').hide().fadeIn(); Why does it fadeIn the entire taglist LI list, and not juse the new item that was appended which is what I want to happen? Thanks

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• Why does Joda time change the PM in my input string to AM?

  - by Tree

  My input string is a PM time: log(start); // Sunday, January 09, 2011 6:30:00 PM I'm using Joda Time's pattern syntax as follows to parse the DateTime: DateTimeFormatter parser1 = DateTimeFormat.forPattern("EEEE, MMMM dd, yyyy H:mm:ss aa"); DateTime startTime = parser1.parseDateTime(start); So, why is my output string AM? log(parser1.print(startTime)); // Sunday, January 09, 2011 6:30:00 AM

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• WPF: Why doesn't the selection I make in a combo box, show up?

  - by Rod

  I'm working on a prototype with Expression Blend 3. I've put a combobox onto the form, and then added ComboBoxItems through the Blend UI. When I test it, and select any item it doesn't show up in the text of the combobox. Why is that?

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• Why "Finalize method should not reference any other objects" ?

  - by mishal153

  I have been pondering why it is recommended that we should not release managed resources inside finalize. If you see the code example at http://msdn.microsoft.com/en-us/library/system.gc.suppressfinalize.aspx , and search for string "Dispose(bool disposing) executes in two distinct scenarios" and read that comment, you will understand what I mean. Only possibility I can think of is that it probably has something to do with the fact that it is not possible to predict when finalizer will get called. Does anyone know the right answer ? thanks, mishal

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• SQL Server 2000: Why is this query w/ variables so slow vs w/o variables?

  - by William DiStefano

  I can't figure out why this query would be so slow with variables versus without them. I read some where that I need to enable "Dynamic Parameters" but I cannot find where to do this. DECLARE @BeginDate AS DATETIME ,@EndDate AS DATETIME SELECT @BeginDate = '2010-05-20' ,@EndDate = '2010-05-25' -- Fix date range to include time values SET @BeginDate = CONVERT(VARCHAR(10), ISNULL(@BeginDate, '01/01/1990'), 101) + ' 00:00' SET @EndDate = CONVERT(VARCHAR(10), ISNULL(@EndDate, '12/31/2099'), 101) + ' 23:59' SELECT * FROM claim c WHERE (c.Received_Date BETWEEN @BeginDate AND @EndDate) --this is much slower --(c.Received_Date BETWEEN '2010-05-20' AND '2010-05-25') --this is much faster

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• C: Why some string.h algorithms work slower than simple hand-made ones?

  - by MInner

  For example, strlen() takes about 3*O(n). Why 3? I've wrote a really simple strlen-like function - it works much faster. int string_len(char s[],int &l) { for(l=0;s[l];l++); return l; } Well, some of my friends says, nearly all of string.h algorithms are slower than they should be.

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• Why can't I create a Date from a string including milliseconds?

  - by KooiInc

  In javascript you can create a Date object from a string, like var mydate = new Date('2008/05/10 12:08:20'); console.log(mydate); //=> Sat May 10 2008 12:08:20 GMT+0200 Now try this using milliseconds in the string var mydate = new Date('2008/05/10 12:08:20:551'); // or '2008/05/10 12:08:20.551' console.log(mydate); //=> NaN Just out of curiosity: why is this?

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• why null pointer exception is not declared as checked exception?

  - by giri

  Hi This was the question asked in interview, null pointer exception is very common why it is not declared as checked exception.I googled but did not get proper answer. Thanks

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• Why I get errors when I try to out a compiler defined macro using a pragma message?

  - by bogdan

  I would like to know why the Visual C++ compiler gets me an warning/error if I use the following code: #pragma message( "You have " _MSC_FULL_VER ) Here is what I get: error C2220: warning treated as error - no 'object' file generated warning C4081: expected ':'; found ')' The problem reproduces for _MSC_FULL_VER or _MSV_VER but not if I try to use others like __FILE__ or __DATE__. These macros are defined, they are documented on msdn

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• Why does my entire page reload in Chrome and Firefox when using asynchronous UpdatePanel postbacks?

  - by Alex

  Being a bit perplexed about this issue by now, I hope some of you gurus can shed some light on my problem... I've developed a AJAX-enhanced website, which has been running fine in IE, Chrome and Firefox for a year or so. I use a Timer-control to check for incoming messages every 30 seconds, and this updates an UpdatePanel showing potential new messages. Now several one of my Firefox users complain about the page refreshing every 30 seconds! I my self cannot reproduce this behaviour, but given the "30 seconds"-description, I cursed my Timer-solution as the culprit. But now, I'm experiencing this error myself, not in Firefox though, but in Google Chrome! (And only on one of my two computers!) Every 30 seconds the page reloads! But I found that it's not only related to the Timer, because all other asynchronous postbacks to the server within UpdatePanels reloads the entire page as well. This error has never been experienced in Internet Explorer (to my knowledge). As I said, this it not only related to the Timer postback, but if it's of interest to anybody the code is like this: <asp:Timer runat="server" ID="MailCheckTimer" Interval="30000" OnTick="MailChecker_Tick"></asp:Timer> <asp:UpdatePanel runat="server" ID="MailCheckerUpdatePanel" UpdateMode="Conditional"> <ContentTemplate> <div class="newmail_box" runat="server" id="newmail_box"> <!-- Content stripped for this example --> </div> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="MailCheckTimer" /> </Triggers> </asp:UpdatePanel> In other places of the website I call the client side __doPostBack function directly from JavaScript in relation to an UpdatePanel. Normal behaviour for this call is to updated the referenced UpdatePanel with some content, but now in Chrome this refreshes the entire page! (but again not consistently, and never in IE) Even the most fundamental UpdatePanel operations like refreshing the content after a button (inside the panel) is clicked, forces the page to reload completely: <asp:Button ID="btnSearch" runat="server" Text="Search" OnClick="btnSearch_Click"></asp:Button> And just to torment me further, I only experience this on my public website, and not in my local development environment, making it a tedious affair for me to find the actual cause! :( Any ideas on why this happens? Why so inconsistently? Has it to do with my UpdatePanel-design? Or does some security setting in Firefox/Chrome that prevent some asynchronous UpdatePanel callbacks? Any help or idea is highly appreciated!

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• Why does the definition of MyAnnotation need Documented, Inherited, Retention & RetentionPolicy?

  - by cafe

  What is the purpose of these java.lang.annotation imports in this code? Why are they needed to define MyAnnotation? import java.lang.annotation.Documented; import java.lang.annotation.Inherited; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; @Documented @Retention(RetentionPolicy.RUNTIME) @Inherited public @interface MyAnnotation { String value() default ""; }

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• Prism's ItemsControl seems to have a xaml parse error. Why?

  - by user158103

  I am at a loss as to why my Shell.xaml's ItemsControl is causing a parse error. I know the syntax is correct because I copied the Silvelright project files from a working project. Right now my only guess is that ItemsControl is dependent on something else. Here is the relevant xaml line for ItemsControl. <ItemsControl x:Name="Region" VerticalAlignment="Center" HorizontalAlignment="Center" Regions:RegionManager.RegionName="Region"/>

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• Why second user login redirects me to /accounts/profile/ url?

  - by drupality

  I am using Django built in view for user login: url(r'^user/login/$', 'django.contrib.auth.views.login', {'template_name': 'users/templates/login.html'}, name='user-login'), After login when I goto user/login again I can login second time. I submit the form and getting: The current URL, accounts/profile/, didn't match any of these. I haven't declare this url in urls.py. What I am doing wrong? Why framework want to redirect to this url?

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• Why do some languages not use semicolons and braces?

  - by Incognito

  It is interesting that some languages do not use semicolons and braces, even though their predecessors had them. Personally, it makes me nervous to write code in Python because of this. Semicolons are also missing from Google's GO language, although the lexer uses a rule to insert semicolons automatically as it scans. Why do some languages not use semicolons and braces?

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• If Visual Studio 2010 based on WPF, why I cannot open it with reflector?

  - by Mendy

  If Visual Studio 2010 based on WPF, why I cannot open it with reflector? In other words, devenv.exe seems to be native assembly, so where is the WPF UI code?

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• Why does an empty database take megabytes of space?

  - by Joonas Pulakka

  When experimenting with (embedded) Apache Derby DB, I noticed that a fresh database, with no tables in it, takes about 1.7 MB of disk space. It's quite a bit more than my common wisdom would expect. Why is that? Are there significant differences in this between various database engines?

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• Why are months off by one with Java SimpleDateFormat ?

  - by Natim

  Hello, I am using SimpleDateFormat to display a Calendar like this : public String getDate() { String DATE_FORMAT = "EEEE, dd/MM/yyyy HH:mm:ss"; SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT); System.err.println(date.getTime().getMonth()); return sdf.format(date.getTime()); } The shell returns 6 and the display : mardi, 06/07/2010 12:44:52 It can't be possible ? Why ? Thanks

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• Why does the compiler allow a function to return a value that is stored as a reference

  - by kern

  Can anybody explain why this code does not generate a compiler error? class Foo { public: int _x; }; Foo getFoo() { Foo myfoo; myfoo._x = 10; return myfoo; } int _tmain() { // should this line of code not be a compiler error? Foo& badfoo = getFoo(); return 0; }

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• What is a magic number, and why is it bad?

  - by Adam Davis

  What is a magic number? Why should it be avoided? Are there cases where it's appropriate?

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• Why is graphviz drawing C to the right of B?

  - by dmd

  Why is graphviz drawing C to the right of B? I want it to look like A B E C instead. digraph { compound=true subgraph cluster_1 { a -> b } b -> c {rank=same b -> e } }

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