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• Are Multi-column Primary Keys in MySQL a optimisation problem?

  - by David

  Been looking into using multi-column primary keys and as performance is extremely important with the size of traffic and database I need to know if there is anything to consider before I start throwing out the unique ID method on many of my tables and start using mulit column primary keys. So, what are the performance/optimisation pros/cons to…

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• Writing a VM - well formed bytecode?

  - by David Titarenco

  Hi, I'm writing a virtual machine in C just for fun. Lame, I know, but luckily I'm on SO so hopefully no one will make fun :) I wrote a really quick'n'dirty VM that reads lines of (my own) ASM and does stuff. Right now, I only have 3 instructions: add, jmp, end. All is well and it's actually pretty cool being able to feed lines (doing it…

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• Creating A Single Threaded Server with AnyEvent (Perl)

  - by David Williams

  I'm working on creating a local service to listen on localhost and provide a basic call and response type interface. What I'd like to start with is a baby server that you can connect to over telnet and echoes what it receives. I've heard AnyEvent is great for this, but the documentation for AnyEvent::Socket does not give a very good…

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• How can I differentiate a manual scroll (via mousewheel/scrollbar) from a Javascript/jQuery scroll?

  - by David Murdoch

  UPDATE: Here is a jsbin example demonstrating the problem. Basically, I have the following javascript which scrolls the window to an anchor on the page: // get anchors with href's that start with "#" $("a[href^=#]").live("click", function(){ var target = $($(this).attr("href")); // if the target exists: scroll to it...…

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• Hide Column based up Paramater Selected SSRS

  - by David A

  I would like to set the visiblity of columns based upon the value selected in a paramater. The problem is I do not want a specific paramater to do this (i.e Hide column X True/False) My report has several diffrent "departments" who are only intrested in certain columns. What would be the syntax for example to hide the "Sales"…

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• Entity Framework 4 and SQL Compact 4: How to generate database?

  - by David Veeneman

  I am developing an app with Entity Framework 4 and SQL Compact 4, using a Model First approach. I have created my EDM, and now I want to generate a SQL Compact 4.0 database to act as a data store for the model. I bring up the Generate Database Wizard and click the New Connection button to create a connection for the generated…

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• php curly braces into array

  - by David

  Hi, I would like to check a opened .txt file for braces that open and close like below: file { nextopen { //content } } no this is not my own language or anything, but I want to get say the nextopen function and all the contents inside the brackets, and all the stuff from inside the file function and add it to an array…

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• Is there a Firebug console -vsdoc.js?

  - by David Murdoch

  If not, does anyone care to write one? I would do it myself...but I don't have time right now...maybe next week (unless someone beats me to it). If you are bored and want to compile the vsdoc: Here is the Firebug API. Here is a blog post about the format for VS doc comments for intellisense. Here is an example vsdoc…

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• Turning on multiple result sets in an ODBC connection to SQL Server

  - by David Griffiths

  I have an application that originally needed to connect to Sybase (via ODBC), but I've needed to add the ability to connect to SQL Server as well. As ODBC should be able to handle both, I thought I was in a good position. Unfort, SQL Server will not let me, by default, nest ODBC commands and ODBCDataReaders - it…

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• Architecture for database analytics

  - by David Cournapeau

  Hi, We have an architecture where we provide each customer Business Intelligence-like services for their website (internet merchant). Now, I need to analyze those data internally (for algorithmic improvement, performance tracking, etc...) and those are potentially quite heavy: we have up to millions of rows /…

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• Update Azure Service Configuration File using Powershell

  - by David Osborn

  I'm trying to write a powershell script that updats each of the DiagnosticsConnectionString and DataConnectionString values below, but I can't seem to find each individual Role node using $serviceconfig.ServiceConfiguration.SelectSingleNode("Role[@name='MyService_WorkerRole']") doing echo…

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• regular expression to match any string but at least 3 characters

  - by David

  sorry am not a regex expert. but my request is simple, i need to match any string that has at least 3 or more characters that are matching So for instance, we have the string "hello world" and matching it with the following: "he" => false // only 2 characters "hel" => true // 3…

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• Convert Google Analytics cookies to Local/Session Storage

  - by David Murdoch

  Google Analytics sets 4 cookies that will be sent with all requests to that domain (and ofset its subdomains). From what I can tell no server actually uses them directly; they're only sent with __utm.gif as a query param. Now, obviously Google Analytics reads, writes and acts on their…

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• Lightweight CMS in PHP

  - by David

  Hi, I am building a site which will require some very limited content management for a client. There are only a few areas of the site which will require the client to be able to update the content themselves. Would it be better to create a very simple custom admin page for the client…

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• Serialization of non-required fields in protobuf-net

  - by David Hedlund

  I have a working java client that is communicating with Google, through ProtoBuf serialized messages. I am currently trying to translate that client into C#. I have a .proto file where the parameter appId is an optional string. Its default value in the C# representation as generated…

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• Wallet Underflow? [closed]

  - by David T. McKee

  I am a software engineer who would love to "disconnect" from the "company store" so-to-speak. This concept of Stack-Overflow is great...so, because I know that software engineers need coffee and food, how do you monetize this? Just wondering.

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• Downloaded chm is blocked, is there a solution?

  - by David Rutten

  CHM files that are downloaded are often tagged as potentially malicious by Windows, which effectively blocks all the html pages inside of it. There's an easy fix (just unblock the file after you download it), but I was wondering if there's a better way to provide unblocked chm files.…

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• Possible to capture all events in a web browser?

  - by David

  I am working on a pet project and am at the research stage. Quick summary I am trying to intercept all form submits, onclick, and every single keydown. My library of choice is either jquery, or jquery + prototypejs. I figure I can batch up the events into a queue/stack and send…

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• Is there a good argument for software patents?

  - by David Nehme

  Now that it looks like software patents are going to be severely limited, does anyone have a good argument for keeping them. It seems like copyright law serves software fine and patents just add overhead to what should be an almost frictionless process. Are there any examples of…

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• Ruby: Why is Array.sort slow for large objects?

  - by David Waller

  A colleague needed to sort an array of ActiveRecord objects in a Rails app. He tried the obvious Array.sort! but it seemed surprisingly slow, taking 32s for an array of 3700 objects. So just in case it was these big fat objects slowing things down, he reimplemented the sort by…

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• ASP.NET MVC : Good Replacement for User Control?

  - by David Lively

  I found user controls to be incredibly useful when working with ASP.NET webforms. By encapsulating the code required for displaying a control with the markup, creation of reusable components was very straightforward and very, very useful. While MVC provides convenient…

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• Logic for family tree program

  - by david robers

  Hi All, I am creating a family tree program in Java, or at least trying to. I have developed several classes: Person - getters and setter for name gender age etc FamilyMember - extends Person getters and setters for setting arents and children Family - which…

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• Module Adminhtml blocks not loading

  - by David Tay

  I was working on a Magento module and it was working fine. At some point, I was trying to enable WYSIWYG in an edit form 'content' field and suddenly, my adminhtml grid and edit blocks stopped being generated. On my system are TinyMCE and Fontis FCKEditor…

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• Clickonce redirect

  - by David Hagan

  Is it possible to deploy an application (using an existing clickonce deployment URL, such that users update to that version) which changes the deployment URL of the deployed application? The scenario is that I have a deployed client (A), which is stable…

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• [iText] Inserting Image onCloseDocument

  - by David

  I'm trying to insert an image in the footer of my document using iText's onCloseDocument event. I have the following code: public void onCloseDocument(PdfWriter writer, Document document) { PdfContentByte pdfByte = writer.getDirectContent(); …

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