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  • MySQL: LIMIT then RAND rather than RAND then LIMIT

    - by Larry
    I'm using full text search to pull rows. I order the rows based on score (ORDER BY SCORE) , then of the top 20 rows (LIMIT 20), I want to rand (RAND) the result set. So for any specific search term, I want to randomly show 5 of the top 20 results. My workaround is code based- where I put the top 20 into an array then randomly select 5. Is there sql way to do this?

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  • Recommend a Semantic Web book?

    - by Logomachist
    I've looked around but most books seem to fall into one of two categories: Either the book talks about SW technologies but doesn't teach you how to use them Or the book is geared for very complex data modeling and ontology creation. Worse, many of those books are outdated. I'm looking for an up-to-date book that teaches technologies like RDF, SPARQL, RDFS, and GDDRL- and frameworks to make use of them. Any recommendations?

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  • Extended Django base-class with multiple instances

    - by Gijs
    I'm modeling a simple movie database using Django. models.py defines a base model Person. I extend Person into Actor and Director, which works as I imagined. Persons must be unique. When (in the Admin) I create an instance of Actor, and this person is also a Director, it won't save because of the unique = True. Any ideas how to solve this problem? (generic foreign keys?) Thx

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  • LIMIT then RAND rather than RAND then LIMIT

    - by Larry
    I'm using full text search to pull rows. I order the rows based on score (ORDER BY SCORE) , then of the top 20 rows (LIMIT 20), I want to rand (RAND) the result set. So for any specific search term, I want to randomly show 5 of the top 20 results. My workaround is code based- where I put the top 20 into an array then randomly select 5. Is there sql way to do this?

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  • A taxonomy of web frameworks?

    - by Rob
    There seem to be several different categories of web frameworks, e.g. MVC, component based, event-driven, action-based, etc. I can't find a comprehensive list of categories and definitions anywhere. (I dare not ask for examples as well.) Is there a general taxonomy of web application frameworks somewhere, or is this too fuzzy a question to allow for definitive answers?

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  • Programmatically convert a video to FLV

    - by Raibaz
    i am currently working on a web application that needs to accept video uploaded by users in any format (.avi, .mov, etc.) and convert them to flv for playing in a flash-based player. Since the site is OpenCms-based, the best solution would be a ready-made plugin for OpenCms that allowed to upload and play videos doing the transcode operation in background, but just a set of Java classes to do the transcode would be great and then i could make the uploading form and playback part on my own.

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  • jQuery find file extension (from string)

    - by SoulieBaby
    Hi all, I was wondering if it was possible for jQuery to find a file extension based on a returned string? A filename (string) will be passed to a function (openFile) and I wanted that function to do different things based on what file has been passed through, it could be image files or pdf files. function openFile(file) { //if .jpg/.gif/.png do something //if .zip/.rar do something else //if .pdf do something else }; I've been looking for something that will find the file's extension but I can't seem to find anything.

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  • C++ OpenSource project for beginner programmer?

    - by VeminZ
    I`m a beginner C++ programmer. And I want to pursue my career in system- and driver-programming. Can you suggest me an opensource projects to I improve my skills in low-level development? I am looking for a project with the following characteristic: - on C\C++ language based - a small project with a small amount of code, yet - UNIX-based systems designed Do you know that something like this?

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  • Autoloading Development or Production configs (best practices)

    - by Xeoncross
    When programming sites you usually have one set of config files for the development environment and another set for the production server (or one file with both settings). I am assuming all projects should be handled by version control like git or svn. Manual file transfers (like FTP) is wrong on so many levels. How you enable/disable the correct settings (so that your system knows which ones to use) is a problem for me. Each system I work on just kind of jimmy-rigs a solution. Below are the 3 methods I know of and I am hoping that someone can submit a more elegant solutions. 1) File Based The system loads a folder structure based on the URL requested. /site.com /site.fakeTLD /lib index.php For example, if the url is http://site.com then the system loads the production config files located in the site.com folder. However, if I'm working on the site locally I visit http://site.fakeTLD to work on the local copy of the site. To setup this I edit my hosts file and add site.fakeTLD to point to my own computer (127.0.0.1/localhost) and then create a vhost in apache. So now I can work on the codebase locally and then push to the server without any trouble. The problem is that this is susceptible to a "host" injection attack. So someone loading site.com could set the host to site.fakeTLD and then the system would load my development config files instead of production. 2) Config Based The config files contain on section for development - and one for production. The problem is that each time you go to push your changes to the repo you have to edit the file to specify which set of config options should be used. $use = 'production'; //'development'; This leaves the repo open to human error should one of the developers forget to enable the right setting. 3) File System Check Based All the development machines have an extra empty file called "development.txt" or something. Each time the system loads it checks for this file - if found then it knows it is in development mode - if missing then it knows it is in production mode. Since the file is NEVER ADDED to the repo then it will never be pushed (and checked out) on the production machine. However, this just doesn't feel right and causes a slight slow down since all filesystem checks are slow. Is there anyway that the server can auto-detect wither to use the development or production configs?

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  • Sparxsystems Enterprise Architect and issuses/tasks tracking system?

    - by peperg
    We (developement team 4 upto 7 people) use Sparxsystems EA for requirement analysis, modeling etc. Do you know any well-working methods to use EA and some task/issue tracking system like Redmine/Mantis/Trac ? The problem is not to duplicate functionality (there are issues/tasks/changes in Redmine and EA) but to have some user friendly interface (preffered web) to manage tasks and issues. By user-friendly I mean "my tasks" page add effort / time tracking easy "add issue" by everyone (simple bug tracking system) mail notifications

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  • Most mature ASP.NET MVC Blog Engine?

    - by Tony_Henrich
    What's the best ASP.NET MVC based blog engine out there which is ready to deploy? I am guessing there are no MVC blog engines which are comparable with WebForms based blog engines like dasBlog, BlogEngine and subText? I think Oxite is a dead end and Orchid is more like a CMS. Looking for an engine which can do these: - RSS feeds support - anti comment spam functionality like support for Akismet - comment post approval support - Some kind of theming is possible

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  • maven conditional dependencies

    - by Joshua
    We would like to bundle library dependencies from (Alfresco or Jackrabbit or ...) based on the customer choice. The number of dependencies actually varies based on the chosen vendor. How do we provide hooks at the maven level, so that the final product just includes the dependent jars as per customer selection.

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  • Caveats of select/poll vs. epoll reactors in Twisted

    - by David
    Everything I've read and experienced ( Tornado based apps ) leads me to believe that ePoll is a natural replacement for Select and Poll based networking, especially with Twisted. Which makes me paranoid, its pretty rare for a better technique or methodology not to come with a price. Reading a couple dozen comparisons between epoll and alternatives shows that epoll is clearly the champion for speed and scalability, specifically that it scales in a linear fashion which is fantastic. That said, what about processor and memory utilization, is epoll still the champ?

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  • MySQL table partitioning qn:

    - by JVXR
    I have a table (innodb) that will have billions of records eventually. Every 2nd week I expect ~ 500K records to get dropped into the table. I would want to partition this table based on the date on which the data is imported - luckily this is a field in the table that is of the format yyyy-mm-dd - Is it possible to partition it based on this date column ? I tried looking at the 18th chapter of mysql docs but couldn't figure out if this is possible. -tia

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  • A good resource for an overview of web technologies

    - by Vijay
    Hello Every one, I have been working on microsoft based web technologies (.net, sql server, iis) for about an year and would like to know the opensource alternatives for the above. I have heard of LAMP, Java based technologies, ruby on rails etc. Can you please point me to a place where I can find more information about these and how they match up against each other. Basically I am looking for an overview of the popular web technologies in today's world. Thanks a lot. Vijay

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  • Selecting element by data attribute

    - by zizo
    Is there an easy and straight-forward method to select elements based on their data attribute? For example, select all anchors that has data attribute named customerID which has value of 22. I am kind of hesitant to use rel or other attributes to store such information, but I find it much harder to select an element based on what data is stored in it. Thanks!

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  • object array mobile development

    - by mixm
    Im currently creating a tile-based game for android. Using java via dalvik JVM. im fretting over a decision to represent objects in a particular map. should i use an id based map (2 dimensional integer array) and place game logic in a separate function in the game engine, or create an object array (2 dimensional array of game objects) and store game logic within the class methods. i am thinking about the cost of object creation and garbage collection vs extensibility.

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  • Good Domain Driven Design samples

    - by jlembke
    I'm learning about DDD and enjoying every minute of it. However, there are some practical issues that are confusing to me that I think seeing some good samples might clear up. So being at peace with those issues, does anyone know of some good working code samples that do a good job of modeling basic DDD concepts? Particularly interested in An illustrative Domain Model Repositories Use of Domain/Application Services Value Objects Aggregate Roots I know I'm probably asking for too much, but anything close will help.

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  • Is there a Markdown editor for Dojo

    - by Emilien
    Is there a good Markdown editor for Dojo? I have seen Control.TextArea (based on Prototype) and Stack Overflow's reverse-engineered version of WMD (seems to rely on jQuery) but I'd rather use a Dojo-based tool, as my site already uses this framework. Does such a tool exist? Googling for dojo markdown editor doesn't seem to return any useful results, apart from a Google Summer of Code 2008 student blogging that he's working on it...

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