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• MySql database design for a quiz

  - by Mark

  I'm making an online quiz with php and mysql and need a bit of help deciding how to design the database for optimal insert of questions/answers and to select questions for the quiz. The table will hold 80 questions each with 4 possible options plus the correct answer. When retrieving the questions and options from the database I will randomly select 25 questions and their options. Is it better to make a single column for all questions, options, and correct answers? For example: ID | Q | OPT1 | OPT2 | OPT3 | OPT4 | ANS Or would it be better to make a column for each individual question, option, and correct answer? For example: Q1 | Q1_OPT1 | Q1_OPT2 | Q1_OPT3 | Q1_OPT5 | Q1_ANS | Q2 | Q2_OPT1 | Q2_OPT2...

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• How can I clone a .NET solution?

  - by tobinharris

  Starting new .NET projects always involves a bit of work. You have to create the solution, add projects for different tiers (Domain, DAL, Web, Test), set up references, solution structure, copy javascript files, css templates and master pages etc etc. What I'd like is an easy way of cloning any given solution. If you use copy/paste, the problem is that you need to then go through renaming namespaces, assembly names, solution names, GUIDs etc. Is there a way of automating this? Something like this would be great: solutionclone.exe --solution=c:\code\abc\template.sln --to=c:\code\xyz --newname=MySolution I'm aware that Visual Studio has project templates, but I've not seen solution templates. Ideas welcome, thanks in advance folks!

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• Looking for Haskell `group` alternative in F#

  - by Heather

  Haskell group descripted there: http://www.haskell.org/ghc/docs/latest/html/libraries/base/Data-List.html#v:group example : group "Mississippi" = ["M","i","ss","i","ss","i","pp","i"] Is there simple F# way of doing it? I can implement something alike let rec sameCounter (data : list<float>) el same (ss : list<float * int>) = if data.Length > (el + 1) then if data.[el] = data.[el + 1] then sameCounter data (el + 1) <| same + 1 <| ss else if same > 0 then sameCounter data (el + 1) <| 0 <| (data.[el], same) :: ss else sameCounter data (el + 1) <| 0 <| ss else ss let group d = sameCounter d 0 0 [] but it's a bit ugly way I think, is there better variant?

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• Functional equivalent of if (p(f(a), f(b)) a else b

  - by oxbow_lakes

  I'm guessing that there must be a better functional way of expressing the following: def foo(i: Any) : Int if (foo(a) < foo(b)) a else b So in this example f == foo and p == _ < _. There's bound to be some masterful cleverness in scalaz for this! I can see that using BooleanW I can write: p(f(a), f(b)).option(a).getOrElse(b) But I was sure that I would be able to write some code which only referred to a and b once. If this exists it must be on some combination of Function1W and something else but scalaz is a bit of a mystery to me! EDIT: I guess what I'm asking here is not "how do I write this?" but "What is the correct name and signature for such a function and does it have anything to do with FP stuff I do not yet understand like Kleisli, Comonad etc?"

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• How to place a symbol (path) relative to the far end of svg text?

  - by dugeen

  I'm working on a program which generates SVG maps. Some of the map items have captions which need a symbol after them (like a plane symbol for an airport caption). If I have a text element thus <text x="30" y="30">Pericles</text> I can place another bit of text at the next character position by saying <text x="30" y="30">Pericles <tspan>!</tspan></text> but I'd like to draw my own symbol at that position with a <path> element. What I'm doing at the moment is having the generating program guess the extent of the text from tables of font metrics etc, but this isn't accurate enough to place the symbol consistently. Is there any way round this - like specifying a <marker> to be used when drawing the text, and using a tspan with an invisible dash in it or something to get the marker placed?

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• Is object clearing/array deallocation really necessary in VB6/VBA (Pros/Cons?)

  - by Oorang

  Hello, A lot of what I have learned about VB I learned from using Static Code Analysis (Particularly Aivosto's Project Analyzer). And one one of things it checks for is whether or not you cleared all objects and arrays. I used to just do this blindly because PA said so. But now that I know a little bit more about the way VB releases resources, it seems to me that these things should be happening automatically. Is this a legacy feature from pre VB6, or is there a reason why you should explicitly set objects back to nothing and use Erase on arrays?

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• Nested BooleanQuery?

  - by KailZhang

  I'm using a BooleanQuery to combine several queries. I find that if I add a BooleanQuery to the BooleanQuery, then no result is returned. The added BooleanQuery is a MUST_NOT one, like -city_id:100. But as lucene's spec says, BooleanQuery could be nested, which I think means it's okay to add such BooleanQuery. Now I have to get all clauses from the BooleanQuery to be added, and then add them to the container BooleanQuery one by one. I'm a bit confused. Anybody could help? Thank you very much!

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• How can I use Amazon's API in PHP to search for books?

  - by TerranRich

  I'm working on a Facebook app for book sharing, reviewing, and recommendations. I've scoured the web, searched Google using every search phrase I could think of, but I could not find any tutorials on how to access the Amazon.com API for book information. I signed up for an AWS account, but even the tutorials on their website didn't help me one bit. They're all geared toward using cloud computing for file storage and processing, but that's not what I want. I just want to access their API to search info on books. Kind of like how http://openlibrary.org/ does it, where it's a simple URL call to get information on a book (but their databases aren't nearly as populated as Amazon's). Why is it so hard to find the information I need on Amazon's AWS site? If anybody could help, I would greatly appreciate it.

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• How do I go about getting the Ajax Queue plugin working in jQuery 1.3?

  - by jonyamo

  I have an app that sends multiple Ajax requests simultaneously. I was originally running into race conditions until I discovered the jQuery Ajax Queue plugin, which works great with jQuery 1.2, but fails with jQuery 1.3. There are actually two different versions of the plugin; I am currently using this one which is the same as the first but just adds a bit more functionality. Anyway, I am using Firebug on Firefox 3.0.10 and when I run my code I don't receive any explicit errors, the call is just never returned. I could obviously continue using v1.2 but would really like to learn why this plugin fails with the latest release and what I can do to get it working. Thanks in advance.

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• Customizing Document library web part

  - by Sushant

  Hi, I am developing a website in Sharepoint 2007. I came across a bit tricky problem. I have a document library web part in a web part page. I am using the summary toolbar view. I dont want users to add new documents on first screeen where it shows folders. I want them to open the folders and add documents there. I cannot do a No toolbar view because it will remove the link from every subsequent page. Has anyone implemented something like this. Please help.

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• [perl] where can i find an array of the Unicode code points for a particular block?

  - by gitparade

  At the moment, I'm writing these arrays by hand. For example, the Miscellaneous Mathematical Symbols-A block has an entry in hash like this: my %symbols = ( ... miscellaneous_mathematical_symbols_a => [(0x27C0..0x27CA), 0x27CC, (0x27D0..0x27EF)], ... ) The simpler, 'continuous' array miscellaneous_mathematical_symbols_a => [0x27C0..0x27EF] doesn't work because Unicode blocks have holes in them. For example, there's nothing at 0x27CB. Take a look at the code chart [PDF]. Writing these arrays by hand is tedious, error-prone and a bit fun. And I get the feeling that someone has already tackled this in Perl!

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• Clear All Event subscriptions (Clone linked)

  - by mattias

  I just implemented Clone from ICloneable and realized that the event subscriptions from my source instance also followed. Is there a good way to clear all those? Currently I am using a couple of these loops for every event I have to clear everything. foreach (var eventhandler in OnIdChanged.GetInvocationList()) { OnIdChanged -= (ItemEventHandler) eventhandler; } foreach (var eventhandler in OnNameChanged.GetInvocationList()) { ... This works fine but clutters the code a bit. Mostly worried to get event dangling.

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• Custom Header Menu in Android App (How To)

  - by masterkrang

  I'm trying to implement a custom header menu in my Android application and I'm wondering what the standard or best practice for creating a header menu. I'm thinking something like the facebook app that displays a log and has some action items like triggering a search and possibly return back to the main activity. Tab Layout doesn't seem to be what I'm looking for. I found a tutorial here that might be close to what I'm looking for but not sure. It seems a bit redundant to instantiate a menu in every Activity. Seems like there would be a way to decouple the Activity from the menu, or at least more loosely couple it. Perhaps I need to implement something with Fragments but I'm sort of new, so I'm not sure yet. Looking forward to your suggestions or hearing how you've implemented something like this. Thanks!

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• What's the difference between FireBug's conole.log() and console.debug() ?

  - by 6bytes

  A very simple code to illustrate the difference. var x = [0, 3, 1, 2]; console.debug('debug', x); console.log('log', x); // above display the same result x.splice(1, 2); // below display kind of a different result console.debug('debug', x); console.log('log', x); The javascript value is exactly the same but console.log() displays it a bit differently than before applying splice() method. Because of this I lost quite a few hours as I thought splice is acting funny making my array multidimensional or something. I just want to know why does this work like that. Does anyone know? :)

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• Why only random-access-iterator implements operator+ in C++?

  - by xopht

  I'd like get far next value for STL list iterator but it doesn't implement operator+, vector has it though. Why and how can I get the value where I want? I think I can do that if I call operator++ several times, but isn't that a little bit dirty? What I want to do is the following: list<int> l; ...omitted... list<int>::iterator itr = l.begin() + 3; // but, list iterator does not have // operator+ What is the best solution for what I want?

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• How to encode(represent) an ornament?

  - by Daniyar

  I would like to find a numeric representation of kazakh national ornaments for generating new ones. The ornaments essentially consist of combinations of relatively basic ornaments. Usually the ornaments are symmetrical. Here are few examples of basic elements: (The images are a bit distorted) And this is an example of a more complex ornament: How could I encode an ornament's representation in as few numbers as possible? So that I could write a program that would generate an ornament, given some sequence of numbers Any ideas are appreciated. As I write this, I have thought that generating images of snowlfakes may be somewhat relevant, although it's possibly just a fractal.

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• Catching / Redirecting 404's (ASP.NET)

  - by maxp

  Ive noticed that when I request a page in ASP.NET (webforms) that does not exist, the 'StaticFile' handler deals with the error notification. Id like to be a bit more helpful in these situations. What is the correct way for me to intercept this 404, and as a result, run some code to redirect the user? Two ways Ive thought of doing which I currently don't really like are: 1 - Create a module that basically does a if (!file.exists($url){redirect to $correctedurl}) 2 - Modify the error.aspx.cs(or the default error page) to do something similar (yuck!)

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• Data Structure Brushup (Java)

  - by Daddy Warbox

  This should be easy for many of you, but for me it's just another bit of rust needing to be chipped away as I get back into basic Java coding. Using bloody associative arrays for so long in other languages have turned me nice and spoiled. :P My problem is simple: I'm storing a set of objects, each containing a string and a number, in a list. I would like each object inserted into this list to be sorted alphabetically by its string. I would also like to be able to retrieve objects from the list by their string as well. I would like to do this as formally and/or efficiently as possible. Is there something already available in the Java standard libraries for this?

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• Creating an array from a MySQL table

  - by Rob

  I'm trying to create an array to use for a curl_multi_exec, but I can't seem to create the array properly. Here is my code: $SQL = mysql_query("SELECT url FROM urls") or die(mysql_error()); //Query the shell table while($resultSet = mysql_fetch_array($SQL)){ $urls[]=$resultSet; } echo $urls; //Test that the array works But when I run this script, all it does is echo "Array" I have no idea what I'm doing wrong, I've checked around google a bit, but can't figure it out. Any insight would be appreciated.

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• Which of these Array Initializations is better in Ruby?

  - by Bragaadeesh

  Hi, Which of these two forms of Array Initialization is better in Ruby? Method 1: DAYS_IN_A_WEEK = (0..6).to_a HOURS_IN_A_DAY = (0..23).to_a @data = Array.new(DAYS_IN_A_WEEK.size).map!{ Array.new(HOURS_IN_A_DAY.size) } DAYS_IN_A_WEEK.each do |day| HOURS_IN_A_DAY.each do |hour| @data[day][hour] = 'something' end end Method 2: DAYS_IN_A_WEEK = (0..6).to_a HOURS_IN_A_DAY = (0..23).to_a @data = {} DAYS_IN_A_WEEK.each do |day| HOURS_IN_A_DAY.each do |hour| @data[day] ||= {} @data[day][hour] = 'something' end end The difference between the first method and the second method is that the second one does not allocate memory initially. I feel the second one is a bit inferior when it comes to performance due to the numerous amount of Array copies that has to happen. However, it is not straight forward in Ruby to find what is happening. So, if someone can explain me which is better, it would be really great! Thanks

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• How does windows resolves short names (8.3) into full names

  - by i3anshee

  I have a PC running 64 bit Windows Server 2003. There is a java application which uses cmd file as a launcher. The launcher does this SET JAVA_HOME= C:\Progra~1\Java "%JAVA_HOME%\bin\java" [java program execution line] Java is installed in C:\Program Files\Java. Since it is a x64 windows it also has C:\Program Files (x86)\ folder. Now the actual problem is that from time to time this application fails to start because it fails to find java. So the question is what windows does to resolve such ambiguity? Based on what it makes decisions about which folder to choose?

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• Physical storage of data in Access 2007

  - by ste

  I've been trying to estimate the size of an Access table with a certain number of records. It has 4 Longs (4 bytes each), and a Currency (8 bytes). In theory: 1 Record = 24 bytes, 500,000 = ~11.5MB However, the accdb file (even after compacting) increases by almost 30MB (~61 bytes per record). A few extra bytes for padding wouldn't be so bad, but 2.5X seems a bit excessive - even for Microsoft bloat. What's with the discrepancy? The four longs are compound keys, would that matter?

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• centering image vertically in all resolutions

  - by gnomixa

  I need to be able to center the image vertically for all the common resolutions. A lot of ppl here on SO have already asked this question before, and 90% of then give this tutorial http://www.jakpsatweb.cz/css/css-vertical-center-solution.html as an answer. However, when viewed at my 1280 by 1024 res monitor in FF, it's not centered. And worse yet, it breaks horribly in IE7. So, it's definitely NOT the answer. Am I chasing the impossible dream? The solution has to work for FF and IE 6/7 the solution can be anything that would work, though being a bit of a purist, I would prefer a div over table:)

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• Singleton design potential leak

  - by iBrad Apps

  I have downloaded a library off of github and have noticed that in the main singleton of the library there is a possible leak in this bit of code: +(DDGameKitHelper*) sharedGameKitHelper { @synchronized(self) { if (instanceOfGameKitHelper == nil) { [[DDGameKitHelper alloc] init]; } return instanceOfGameKitHelper; } return nil; } Now obviously there is no release or autorelease anywhere so I must do it but how and in what way properly? I have looked at various Singleton design patterns on the Internet and they just assign, in this case, instanceOfGameKitHelper to the alloc and init line. Anyway how would I properly fix this? Thanks!

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• SP: Random Records, Fave Record, Plus Known Record, NO repetition.

  - by Munklefish

  Hi, Thanks to help from a lot of you guys ive been given the following code which works great. However ive realised ive missed an important bit of info out of the question and so have reposted here (with updated code) to clarify. The following code gets 5 random records from a table plus a further single record based on the users favourite as identified in a second table: CREATE PROCEDURE web.getRandomCharities ( @tmp_ID bigint --members ID ) AS BEGIN WITH q AS ( SELECT TOP 5 * FROM TBL_CHARITIES WHERE cha_Active = 'TRUE' AND cha_Key != '1' ORDER BY NEWID() ) SELECT * FROM q UNION ALL SELECT TOP 1 * FROM ( SELECT * FROM TBL_CHARITIES WHERE TBL_CHARITIES.cha_Key IN ( SELECT members_Favourite FROM TBL_MEMBERS WHERE members_Id = @tmp_ID ) EXCEPT SELECT * FROM q ) tc END However, i realised i also need to include the record where "cha_Key == '1'" if it isnt the same as the record returned in the second SELECT statement in the code shown above. HOpe that makes sense? THANKS!!!

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