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• MySQL table organization and optimization (Rails)

  - by aguynamedloren

  I've been learning Ruby on Rails over the past few months with no prior programming experience. Lately, I've been thinking about database optimization and table organization. I know there are great books on the subject, but I typically learn by example / as I go. Here's a hypothetical situation: Let's say I am building a social network for a niche community with 250,000 members (users). The users have the ability to attend events. Let's say there are 50,000 past/present/future events. Much like Facebook events, a user can attend any number of events and an event can have any number of attendees. In the database, there would be a table for users and a table for events. Somehow I would have to create an association between the users and events. I could create an "events" column in the users table such that each user row would contain a hash of event IDs, or I could create an "attendees" column in the events table such that each event row would contain a hash of user IDs. Neither of these solutions seem ideal, however. On a users profile page, I want to display the list of events they are associated with, which would require scanning the 50,000 event rows for the user ID of said user if I include an "attendees" column in the events table. Likewise, on an event page, I want to display a list of attendees for the event, which would require scanning the 250,000 user rows for the event ID of said event if I include an "events" column in the users table. Option 3 would be to create a third table that contains the attendee information for each and every event - but I don't see how this would solve any problems. Are these non-issues? Rails makes accessing all of this information easy, but I guess I'm worried about scale. It is entirely possible that I am under-estimating the speed and processing power of modern databases / servers / etc. How long would it take to scan 250,000 user rows for specific event IDs - 10ms? 100ms? 1,000ms? I guess that's not that bad. Am I just over-thinking this?

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• Holiday Book Recommendation

  - by dalton

  I'm after a book to read whilst on holiday. Some criteria: The book has to be relatively short. < 500 pages. I'd prefer a book that changes your thinking, rather than reams of syntax to look at. So the last two years here have been my books: Last year, The Craftsman by Richard Sennet (Changed how I viewed career development, quality) Year before, Zen and The art of motorcycle maintenance (Makes you think about quality, maintenance)

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• JBoss Seam - order event listeners

  - by Walter White

  Hi all, I would like to order my event listeners. Is it possible to do this in JBoss Seam 2.x? I am thinking as a workaround, which is quite simple, I will just daisy chain my events: fire event A. do something on event A. a. fire event B do something on event B. Any comments with this design? Is this a good / bad practice? Thanks, Walter

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• Java 2D turn-based game programming: handle 2 mouse clicks per player

  - by Humberto Pinheiro

  So suppose I'm developing a chess-like program using Java's Swing. I added a MouseListener to handle user input. To make a move the user must click a valid piece and then click a valid place. What's the best way to track the 2 mouse clicks in a turn? I'm thinking in use some kind of variable to record if is the turn's first click or second.

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• Determine 32/64 bit architecture in assembly

  - by dboarman-FissureStudios

  I was reading over this question and wondered if the accepted answer might also be a way to determine the architecture. For instance, in asm could I push a WORD onto the stack and then check SP. Compare the new SP to the old SP: Diff of 4 means 32 bit Diff of 8 means 64 bit Am I correct in this thinking?

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• Good use of recursion in chess programming?

  - by JDelage

  Hi, As part of a homework assignment, I have to program a simple chess game in Java. I was thinking of taking the opportunity to experiment with recursion, and I was wondering if there's an obvious candidate in chess for recursive code? Thank you, JDelage

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• Q&A database map like stackoverflow - seperate table for questions titles

  - by Qiao

  I am planning to make Q&A system (quite specific, has nothing to do with IT) I was looking for Stackoverflow database map: http://meta.stackoverflow.com/questions/2677/anatomy-of-a-data-dump/2678#2678 And I am thinking is not it is better practice to make separate table for questions titles. With "firstPostId". Instead of |- PostTypeId | - 1: Question | - 2: Answer So I want to know, why stackoverflow did not use separate table for questions title. Is it "Do not optimize yet" or does it have any logic behind it?

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• Parse tree and grammars information

  - by fuzzylogikk

  Do anyone know where to find good online resources with examples how to make grammars and parsetrees? Preferebly introductary materials. Info that is n00b friendly, haven't found anything good with google myself. edit: I'm thinking about theory, not a specific parser software.

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• Tablet pc handwriting recognition: can one program with it?

  - by Tunji Gbadamosi

  I'm thinking that it may be useful to be able to use handwriting recognition to write code. I can't seem to find evidence of people doing this. So, my questions are: is it possible, has someone done it, if so, what did they think?

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• How do bind a List<object> to a DataGrid in Silverlight?

  - by Ben McCormack

  I'm trying to create a simple Silverlight application that involves parsing a CSV file and displaying the results in a DataGrid. I've configured my application to parse the CSV file to return a List<CSVTransaction> that contains properties with names: Date, Payee, Category, Memo, Inflow, Outflow. The user clicks a button to select a file to parse, at which point I want the DataGrid object to be populated. I'm thinking I want to use data binding, but I can't seem to figure out how to get the data to show up in the grid. My XAML for the DataGrid looks like this: <data:DataGrid IsEnabled="False" x:Name="TransactionsPreview"> <data:DataGrid.Columns> <data:DataGridTextColumn Header="Date" Binding="{Binding Date}" /> <data:DataGridTextColumn Header="Payee" Binding="{Binding Payee}"/> <data:DataGridTextColumn Header="Category" Binding="{Binding Category}"/> <data:DataGridTextColumn Header="Memo" Binding="{Binding Memo}"/> <data:DataGridTextColumn Header="Inflow" Binding="{Binding Inflow}"/> <data:DataGridTextColumn Header="Outflow" Binding="{Binding Outflow}"/> </data:DataGrid.Columns> </data:DataGrid> The code-behind for the xaml.cs file looks like this: private void OpenCsvFile_Click(object sender, RoutedEventArgs e) { try { CsvTransObject csvTO = new CsvTransObject.ParseCSV(); //This returns a List<CsvTransaction> and passes it //to a method which is supposed to set the DataContext //for the DataGrid to be equal to the list. BindCsvTransactions(csvTO.CsvTransactions); TransactionsPreview.IsEnabled = true; MessageBox.Show("The CSV file has a valid header and has been loaded successfully."); } catch (Exception ex) { MessageBox.Show(ex.Message); } } private void BindCsvTransactions(List<CsvTransaction> listYct) { TransactionsPreview.DataContext = listYct; } My thinking is to bind the CsvTransaction properties to each DataGridTextColumn in the XAML and then set the DataContext for the DataGrid to the List<CsvTransaction at run-time, but this isn't working. Any ideas about how I might approach this (or do it better)?

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• lambdas and attributes in c#

  - by Berryl

  Can you use a lambda expressions as an argument to an attribute? The motivation I am thinking of would be to eliminate reliance on magic strings Cheers, Berryl

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• Replace all & that are not a HTML entity using C#

  - by Eddie

  Basically a dup of this question using php, but I need it for C#. I need to be able to replace any & that is not currently not any HTML entity (e.g. &amp;) before outputting to screen. I was thinking a regex, but I'm not sure if .Net has something built in that will do this.

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• Algorithm for a dice problem

  - by vivekeviv

  I was thinking what should be the best algorithm for finding all the solutions of this puzzle. http://1cup1coffee.com/puzzle/endice/ Could backtracking be the an approach for solving this or can you suggest any other approach? Thanks

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• Passing Validation exceptions via WCF REST

  - by Coppermill

  I am using WCF and REST, and I have complex types, which are working fine. Now I need to check for validation, I am thinking of using DataAnnotations e.g. public class Customer { [Required] public string FirstName {get;set;} } Now where the issue is how do I pass this validation down to the REST service? ALso I need to validate the object when it comes back, and throw an exception, if I am to throw an exception then what is the best way of doing this using REST?

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• 256 colors, foreground and background

  - by push.cx

  This is a tale of two scripts and is related to a previous question. The two scripts are at http://gist.github.com/50692. The ansi.rb script displays all 256 colors on all 256 background colors. The ncurses.rb script displays all 256 foreground colors but the background displays the basic 16 and then seems to cycle through various attributes like blinking and reverse video. So what gives? Is this the bug in ncurses that it uses a signed integer for color pairs? (ie 'tput colors' says 256 but 'tput pairs' says 32767 instead 65536) It seems like if that were the case the first half of the colors pairs would display properly but the second half would repeat or get into the attributes as the int wraps.

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• Sorting a text file by date - Date looks like DD/MM/YYYY

  - by John N

  I am trying to sort the dates from the earliest to the latest. I was thinking about using the bufferedreader and do a try searching the first 2 characters of the string and then the 4th and 5th characters and finally the 7th and 8th characters, ignoring the slashes. The following is an example of the text file I have: 04/24/2010 - 2000.0 (Deposit) 09/05/2010 - 20.0 (Fees) 02/30/2007 - 600.0 (Deposit) 06/15/2009 - 200.0 (Fees) 08/23/2010 - 300.0 (Deposit) 06/05/2006 - 500.0 (Fees)

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• HTML Markup To Use For Video Transcripts

  - by phirschybar

  Any idea what the proper containing markup would be to indicate a transcript for a video? Thinking accessibility for folks with disabilities but also perhaps search engine recognition of the association between the text and the video.

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• W2k8 RC1: Windows Media Servers (WMS) as proxy

  - by da_didi

  I will have one streaming-server (W2k8, unknown streaming protocol [rtsp, mss, http]) and half dozen streaming-servers as proxies to save bandwidth. I have read the documentation and installed the modules, but I am unsure how I have to configure the proxy's according to http://technet.microsoft.com/de-de/library/ee126142(en-us,WS.10).aspx - as a proxy or reverse proxy and how I minimize the bandwidth needs between origin server and proxy's. What is the best way to realize my setup? Any short how-tos? How can I announce all players to use the proxy? Route all rtsp/mms/http-requests through my proxy? Announce the proxy with DHCP-releases? Thanks!

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• Cleaning all inline events from HTML tags

  - by Itay Moav

  For HTML input, I want to neutralize all HTML elements that have inline js (onclick="..", onmouseout=".." etc). I am thinking, isn't it enough to encode the following chars? =,(,) So onclick="location.href='ggg.com'" will become onclick%3D"location.href%3D'ggg.com'" What am I missing here? Edit: I do need to accept active HTML (I can't escape it all or entities is it).

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• MySQL function: Rotate old entries to archive table

  - by confiq

  Hi, I'm looking for the function that will take rows older then X days and put it in archive table... Was thinking to make function so it will be easer to execute... something like CREATE TABLE archive_NUMBER_OF_WEEK (...); INSERT INTO archive_NUMBER_OF_WEEK SELECT * FROM content WHERE DATE < X days; DELETE * FROM content WHERE DATE < X days RENAME TABLE content TO content_backup, content_temp TO content; Will post when I finish it :)

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• Where are Riak Post-Commit Hooks run?

  - by pixelcort

  I'm trying to evaluate using Riak's Post-Commit Hooks to build a distributed, incremental MapReduce-based index, but was wondering which Riak nodes the Post-Commit Hooks actually run on. Are they run on the nodes the client used to put the commits, or on the primary nodes where the data is persisted? If it's the latter, I'm thinking I can from there efficiently do a map or reduce and put additional records from the output.

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• Are there any "undocumented features" in Silverlight?

  - by Sorskoot

  I was wondering if there are any features in Silverlight 2 or 3 that aren't documented or are hidden very deep in the framework? Stuff that can be very helpful in some cases, but can be a pain to find. Are there any "hidden" gems? I'm thinking about stuff you normaly don't find in tutorials and in demos. For example, finding information about the operating system the Silverlight Application is running on thru the System.OperatingSystem class.

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• Mono ASP.NET COM Reference

  - by Benny

  I am sure this is a very dumb question to be asking for such a platform as Mono, but I am really stuck with .NET on one of my only remaining projects on MS platforms and would like to move away from it. The only problem is that the web site is dependent on a COM library that is simply a socket wrapper enforcing a messaging protocol. I could reverse the code (I actually made a 10k line attempt) but there's nothing better than the original if it works. Is there any way to reference a tlb export on Mono? Any advice would be greatly appreciated. Thanks in advance!

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• how to get LIKE clause to work in asp.net and mssql

  - by anoob836

  Hi, I am doing a really simple query in asp.net but after I inserted the LIKE clause it stops working. Example: String sql = " SELECT * FROM Products WHERE ID = @MYID AND Name LIKE '%@MYNAME%' "; SqlCommand command = new SqlCommand(sql, cn); If I removed the LIKE it works. Hence I am thinking its to do with the '' quotes? Thanks

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• jQuery methodology?

  - by leeand00

  It seems to me that jQuery doesn't seem to be written as an OOP framework, it seems too short, and not verbose enough for that. Am I right in thinking this and if it isn't written as OOP, then what methodology are they using?

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