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Articles indexed Tuesday April 13 2010

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  • SO what RDF database do i use for product attribute situation initially i thought about using EAV?

    - by keisimone
    Hi, i have a similar issue as espoused in http://stackoverflow.com/questions/695752/product-table-many-kinds-of-product-each-product-has-many-parameters i am convinced to use RDF now. only because of one of the comments made by Bill Karwin in the answer to the above issue but i already have a database in mysql and the code is in php. 1) So what RDF database should I use? 2) do i combine the approach? meaning i have a class table inheritance in the mysql database and just the weird product attributes in the RDF? I dont think i should move everything to a RDF database since it is only just products and the wide array of possible attributes and value that is giving me the problem. 3) what php resources, articles should i look at that will help me better in the creation of this? 4) more articles or resources that helps me to better understand RDF in the context of the above challenge of building something that will better hold all sorts of products' attributes and values will be greatly appreciated. i tend to work better when i have a conceptual understanding of what is going on. Do bear in mind i am a complete novice to this and my knowledge of programming and database is average at best.

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  • Step-by-step execution for Intel AT&T assembler?

    - by Søren Haagerup
    Hello everyone, I'm writing a compiler that converts source code (written in a small imperative programming language) to Intel AT&T 32-bit assembler. I tend to spend a lot of time debugging, because of nasty offset-mistakes etc. in the generated code, and I would like to know if anyone knows of a tool to "walk through" the generated assembler code step-by-step, visualizing what's on the stack etc. I use Ubuntu Linux as my development platform, and I'm comfortable with the terminal -- a GUI-program would be nice though. Does it exist? Or is there a good reason it doesn't (maybe the problem isn't so straightforward..?) If you have good ideas for approaching debugging tasks in assembly code, I'll be glad to hear from you!

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  • .NET developer has a few hours to cram for a Java proficiency test. What to do?

    - by Paul Sasik
    I have an interview tomorrow morning and just found out that I will also be taking an hour-long Java proficiency test! I am a certified C# .NET developer but have barely touched Java since college. (Yes, I am thinking about switching from .NET development to Java!) I'm not going to be able to effectively cram the whole of the Java library by tomorrow morning. What are some key ideas that I should study that might actually make a difference in such a short time frame? (The examiners will be taking into account that I have had little exposure to Java.) Thanks! Edit NOTE: I think that the exam is going to be written, so no specific IDE.

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  • Creating excel template 2003 in C# on a machine with both 2003 and 2007 installed.

    - by Ragha J
    I have both 2003 and 2007 Excel versions installed on my machine. The current source code uses Office11 (2003) interop assembly Microsoft.Office.Interop.Excel.dll to create the Excel template. When I create the template and open in Excel 2007, it opens perfectly. The same template when I open in 2003 I get the message "File format is not valid". _excel = new Excel.Application(); _workbooks = _excel.Workbooks; _excel.Visible = false; _excel.DisplayAlerts = false; // create and add a workbook with 1 worksheet named "Sheet1" _workbook = _workbooks.Add(Excel.XlWBATemplate.xlWBATWorksheet); _sheet = (Excel.Worksheet)_workbook.ActiveSheet;

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  • Character Encoding, UTF or ANSI?

    - by Paulocoghi
    I'm using Eclipse in Ubuntu to edit PHP files. But, unfortunately, some of these PHP files were created in Notepad++ in Windows XP, with ANSI encoding defined. Also, these files generates HTML codes with charset=ISO-8859-1. When I configured Eclipse to ISO-8859-1, many special characters were lost and changed to '???', and when I try to save a file with ISO enconding, Eclipse displays an error that was not possible to save the file because some characters aren't compatible with the charset. How can I save these files without changing the encoding, or how can I change the encoding without lose characters.

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  • Licensing WPF application

    - by Macros
    Does anyone have any guidance on the best way to manage licensing for a WPF application? I would like to have different levels of licensing (Free, Trial and Professional). The app itself will probably be distributed with a WiX installer (if that makes any difference)

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  • Twitter Makes a Move to Marketing

    After much speculation about ads, licensing deals and souped-up enterprise versions, Twitter debuts its promoted tweets platform, giving businesses&#146; tweets a prominent position on the site.

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  • Twitter Makes a Move to Marketing

    After much speculation about ads, licensing deals and souped-up enterprise versions, Twitter debuts its promoted tweets platform, giving businesses&#146; tweets a prominent position on the site.

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  • Opinion: IT Strangled by Overspecialization

    What happened to the old "sysadmin" of just a few years ago? We've split what used to be the sysadmin into application teams, server teams, storage teams, and network teams. Now look at what we've done -- knowledge is so decentralized we must invent new roles to act as liaisons between all the IT groups.

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  • Ubuntu's New Web Office Integration

    <b>LinuxUK:</b> "Take for instance a low powered, possibly mobile/embedded system with limited processing power and memory. A cloud based service for these devices could allow resource intensive tasks to be offloaded to an online server somewhere, greatly improving the UX"

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  • How to determine source of file corruption for downloaded images?

    - by sunpech
    I've been downloading Visual Studio 2010 off of the Dreamspark.com website using Akamai Downloader. The .img file is 2.2 GB in size. I've downloaded it twice so far, and when I try to mount it using Gizmo, it complains that "the disk structure is corrupted and unreadable". The drive does mount, but it is unreadable. Is there a way to determine where the source of the data corruption is coming from? Is it my computer as it's receiving it? The hosting server(s)? My ISP? My router? My ethernet cable? It's a hefty download to do again and again from home, only to find out once it's fully downloaded that it's unreadable. I think I can almost rule out my PC, router, and ethernet cable, as I've been able to download various other files without corruption. Note: There is no checksum to verify against

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  • Amazon CloudFront and EC2: Global Load Balancing

    - by Matt Rogish
    We have an app that is going to store and serve up a decent amount of data in S3 to a global audience where latency should be minimized. So, we've been doing tests with Amazon CloudFront and have seen favorable results. However, we need a thin middleware layer (to do security etc.) and we'd like to put that in EC2. Due to security restrictions, this middleware layer will do the file streaming from S3/CloudFront: S3/CloudFront - EC2 - Clients We can geographically distribute the EC2 nodes (US East/West, and Ireland) but the problem is that a client in the EU would hit our US server and be fed data from there, thus rendering much of the performance benefit of CloudFront moot. I've been digging through the EC2 docs but I can't find a built-in way to get a geographically distributed version of EC2 a la CloudFront. Elastic Load Balancing sounds like the way to go, but I can't seem to find a way with that to direct based on routing... Preferably, we'd like to keep the amount of stuff outside of EC2/S3/etc. to a minimum (for obvious reasons). Any ideas how to do that within the EC2/S3 framework? DNS/routing tricks? Thanks!

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  • Destination host unreachable - Windows Server 2008

    - by Doug
    Hi There, I'm working with a windows 2008 domain controller, which I'm having issues connecting to internet resources. A small bit of background, this is a 2008 domain controller that has been added into an existing Win 2k domain, with a goal of replacing the older computers. Both of the older controllers can still access internet resources, and so can all the clients. When I ping Google.ca from the new server, it does resolve to an ip address, but then says "Reply from 192.168.123.20: Destination host unreachable." I'm really at a lost now, I've checked and rechecked my ip configuration, the default gateway is my router, the primary DNS server is the my DC, and the secondary DNS is also my router. The DNS server on the domain has a forwarder added for the router as well. Everything on my local network works just fine, all my internal resources can be resolved. For the time being, I've stopped the Firewall service. I'm not 100% used to Server 2008 yet, but it might be a case of just missing something simple. Thanks for your time.

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  • How to create a custom "render :my_format => argument" in rails 2.3(.5)?

    - by Rafael
    Hey! I would like to create a custom render as specified in title. For instance, I have my controller: class MyController < ApplicationController def index respond_to do |format| format.html # index.html.erb format.xml { render :xml => @objs } end end end , but I would like something like this: class MyController < ApplicationController def index respond_to do |format| format.html # index.html.erb format.xml { render :xml => @objs } format.my_format { render :my_format => @objs } end end end Is it possible? What are the steps I need to make it work? Thanks in advance!

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  • Showing all a Gem's build flags

    - by Rob
    This is more a curiosity than necessity question. I've just installed nokogiri again with RubyGems and it is saying "WARNING: Nokogiri was built against LibXML version 2.7.5, but has dynamically loaded 2.7.6" This is easy enough to fix, but it lead to a more general question: how do I see all the configuration options for a rubygem before installing it? I found the easiest way I know how is to visit the gem folder an run "ruby nokogiri-0.0.0/ext/nokogiri/extconf.rb -h" and that shows me it, but there has to be an easier way, right? I was expecting some kind of "sudo gem install nokogiri -- --help" command that would show the build flags. I've searched around a bit but didn't see anything, anybody know how to do this before I go digging into RG's source :)?

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  • How good idea is it to use code contracts in Visual Studio 2010 Professional (ie. no static checking

    - by Lasse V. Karlsen
    I create class libraries, some which are used by others around the world, and now that I'm starting to use Visual Studio 2010 I'm wondering how good idea it is for me to switch to using code contracts, instead of regular old-style if-statements. ie. instead of this: if (String.IsNullOrWhiteSpace(fileName)) throw new ArgumentNullException("fileName"); (yes, I know, if it is whitespace, it isn't strictly null) use this: Contract.Requires(!String.IsNullOrWhiteSpace(fileName)); The reason I'm asking is that I know that the static checker is not available to me, so I'm a bit nervous about some assumptions that I make, that the compiler cannot verify. This might lead to the class library not compiling for someone that downloads it, when they have the static checker. This, coupled with the fact that I cannot even reproduce the problem, would make it tiresome to fix, and I would gather that it doesn't speak volumes to the quality of my class library if it seemingly doesn't even compile out of the box. So I have a few questions: Is the static checker on by default if you have access to it? Or is there a setting I need to switch on in the class library (and since I don't have the static checker, I won't) Are my fears unwarranted? Is the above scenario a real problem? Any advice would be welcome.

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