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• EAV - is it really bad in all scenarios?

  - by Giedrius

  I'm thinking to use EAV for some of the stuff in one of the projects, but all questions about it in stackoverflow end up to answers calling EAV an anti pattern. But I'm wondering, if is it that wrong in all cases? Let's say shop product entity, it has common features, like name, description, image, price, etc., that take part in logic many places and has (semi)unique features, like watch and beach ball would be described by completely different aspects. So I think EAV would fit for storing those (semi)unique features? All this is assuming, that for showing product list, it is enough info in product table (that means no EAV is involved) and just when showing one product/comparing up to 5 products/etc. data saved using EAV is used. I've seen such approach in Magento commerce and it is quite popular, so may be there are cases, when EAV is reasonable?

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• Does it make sense to write build scripts in C++?

  - by Klaim

  I'm using CMake to generate my projects IDE/makefiles, but I still need to call custom "scripts" to manipulate my compiled files or even generate code. In previous projects I've been using Python and it was OK, but now I'm having serious trouble managing a lot of dependencies in two very big projects I'm working on so I want to minimize the dependencies everywhere. Someone suggested to me to use C++ to write my build scripts instead of adding a language dependency just for that. The projects themeselves already use C++ so there are several advantages that I can see: to build the whole project, only a C++ compiler and CMake would be necessary, nothing else (all the other dependencies are C or C++); C++ type safety (when using modern C++) makes everything easier to get "correct"; it's also the language I know the better so I'm more at ease with it even if I'm able to write some good Python code; potential gain in execution speed (but i don't think it will really be perceptible); However, I think there might be some drawbacks and I'm not sure of the real impact as I didn't try yet: might be longer to write the code (that said I'm not sure because I'm efficient enough in C++ to write something that work quickly, so maybe for this system it wouldn't be so long to write) (compilation time shouldn't be a problem for this case); I must assume that all the text files I'll read as input are in UTF-8, I'm not sure it can be easilly checked at runtime in C++ and the language will not check it for you; libraries in C++ are harder to manage than in scripting languages; I lack experience and forsight so maybe I'm missing advantages and drawbacks. So the question is: does it make sense to use C++ for this? do you have experiences to report and do you see advantages and disadvantages that might be important?

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• Retrieve data from an ASP.Net application using Ado.Net 2.0 disconnected model

  - by nikolaosk

  This is the second post in a series of posts regarding to ADO.Net 2.0. Have a look at the first post if you like. In this post I am going to investigate the "Disconnected" model. When I say "Disconnected" I mean Datasets . Datasets are in memory representations of tables in a particular database. A Dataset contains a Table collection and each Table collection contains a Row collection and each Row collection contains a Columns collection. So initially you connect to the database, get the data to...(read more)

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• not being able to access any sudo function on my pc

  - by explorex

  Hi, I am not being to access any functions in my desktop and I don't have an OS besides Ubuntu 10.04 Lucid Linux and I am new to ubuntu. I think I rebooted my computer thinking that Google Chrome crashed. I opened Google Chrome but it showed opening message but never opened so I restarted my computer. and when my system was loading ('i was playing with keyboard dont know what I typed') and when by ubutnu loaded, I was unable to access anything some of characteristics are listed below I cannot hear any sound I cannot access wired ethernet connection on the right corner where I usually enable to access interne and I have no internet. There is no local apache server either. when ever I try to start apacer I get setuid must be root or something. When I type sudo then I get message setuid must be root. I cannot access orther external storage devices like pendrive and portable hard drive and cannot mount my other drives with FAT32 filesystem. When I try to start my apache webserver with out typing sudo then I get message cannnot open socket or something like it. EDIT:: i remember also doing command chown -R www-data / earlier and got error message EDIT:: and i cannot shutdown my computer, it only logs off

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• Construct sentences from tabular data

  - by Sumeet

  I have a huge set of html files an have to retrieve the meaningful information from them. Most of the task is accomplished, now the problem is with HTML tables. I have some literature on how to extract meaningful tables from html, but my problem is with creating meaningful sentences from tabular data (or attribute value pairs extracted from a table). Are there any NLP/Machine learning techniques to do this? Here is what I expect. Suppose below is a sample table: col_Name: Sumeet col_year: 2011 col_winner: quiz Can this be made to something meaningful like "Sumeet won quiz in 2011"?

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• Retrieve data from an ASP.Net application using ADO.Net 2.0 connected model

  - by nikolaosk

  I have been teaching Entity Framework,LINQ to SQL,LINQ to objects,LINQ to XML for some time now. I am huge fan of LINQ to Entities and I am using Entity Framework as my main data access technology. Entity framework is in the second version right now and I can accomplish most of the things I need. I am sure the guys in the ADO.Net team will implement many more features in the future. I am a strong believer that you cannot really understand the benefits of LINQ to SQL or LINQ to Entities unless you...(read more)

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• CMS and Databases vs. DIY

  - by hozza

  I have been programming for many years now, primarily in PHP and the like and would consider myself an intermediate programmer. Some of my online projects have now gone global and very widely used, i am now in deep thought about scalability etc. All of my systems so far are written in PHP, no known database structure such as MySQL etc. Instead our databases use an 'operating system style' method of storing information, files and folders if you will. We also do not use any outside/third-party software or CMS, so far this has work out extremely well. Most people, when they hear about the way we do things, criticize and say that is an idiotic idea but normally after seeing our systems in more dept are converted to our way of doing things. Is it really that bad to not use a standard databasing systems and only using the one (slightly heavier than others) language of PHP? How well on the face of it will this kind of setup scale? N.B. Our systems include things such as account and user management, documentation development and task/project managing.

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• Countour Mapping API

  - by Crash

  I have done some searching on Google, but haven't come up with much as of yet. I am wanting to take a set of point data, which I had previously been using to create weighted points for a heat map through the Google API, and turn them into a contour map to overlay on the Google Maps API. I haven't seen anything in Google's code that would let me do this. Does anyone know of a good API to create such an overlay? Or is there possibly something I have overlooked that Google offers?

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• Entity communication: Message queue vs Publish/Subscribe vs Signal/Slots

  - by deft_code

  How do game engine entities communicate? Two use cases: How would entity_A send a take-damage message to entity_B? How would entity_A query entity_B's HP? Here's what I've encountered so far: Message queue entity_A creates a take-damage message and posts it to entity_B's message queue. entity_A creates a query-hp message and posts it to entity_B. entity_B in return creates an response-hp message and posts it to entity_A. Publish/Subscribe entity_B subscribes to take-damage messages (possibly with some preemptive filtering so only relevant message are delivered). entity_A produces take-damage message that references entity_B. entity_A subscribes to update-hp messages (possibly filtered). Every frame entity_B broadcasts update-hp messages. Signal/Slots ??? entity_A connects an update-hp slot to entity_B's update-hp signal. Something better? Do I have a correct understanding of how these communication schemes would tie into a game engine's entity system? How do entities in commercial game engines communicate?

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• Several classes need to access the same data, where should the data be declared?

  - by Juicy

  I have a basic 2D tower defense game in C++. Each map is a separate class which inherits from GameState. The map delegates the logic and drawing code to each object in the game and sets data such as the map path. In pseudo-code the logic section might look something like this: update(): for each creep in creeps: creep.update() for each tower in towers: tower.update() for each missile in missiles: missile.update() The objects (creeps, towers and missiles) are stored in vector-of-pointers. The towers must have access to the vector-of-creeps and the vector-of-missiles to create new missiles and identify targets. The question is: where do I declare the vectors? Should they be members of the Map class, and passed as arguments to the tower.update() function? Or declared globally? Or are there other solutions I'm missing entirely?

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• Programming a trading strategy

  - by Rob

  Excuse me if I'm not descriptive enough, as I do not have much of a background when it comes to these things: How would I go about coding a primitive trading strategy and link it to some sort of artificial trading environment? Where do I start, and what are some other essential questions I should be asking? I am interested more in doing this because it interests me than making returns. Ideally it utilizes random/historical market data and doesn't actually execute any real trades. My background: I'm almost done my undergrad degree in computer science, and have had intro finance and economic courses. Familiar mostly with C and Java.

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• Getting data from csv file and returning objects in collections

  - by Jacob

  I have very simple class of person as below: public class Person { int ID; Gender gender; Date dateOfBirth; public Person(final int iD, final Gender gender,final Date dateOfBirth) { ID = iD; this.gender = gender; this.dateOfBirth = dateOfBirth; } } Gender is enum : public enum Gender { Male, Female } In CSV file i will have data, for example: 1;Male;23-02-2001 2;Female;11-06-1989 3;Male;02-12-1999 Is in java any simple way to get all persons from csv file and return it as ArrayList<Person> persons ?

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• Personalized URL with pre-populated data

  - by AttackingHobo

  I think I am going to use Google spreadsheets and an embedded form. I see that it is possible to pre-populate the fields with URL parameters. So I think I just need a way to redirect with the correct data from a database when a user goes to their Personalized URL. I have no idea how to do the second part. Or if it is even the best way to do it. How do I set up Personalized URLS? How do I redirect from those URLS to the spreadsheets? Is this even the best method for pre-filled forms?

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• Oracle Master Data Management at OOW 2012: A Look Back

  - by Mala Narasimharajan

  Oracle Master Data Management had a great showing at OOW 2012 ! Special thanks to our customers and partners for presenting with us, sharing their use cases and successes as well as co-sponsoring events.  Almost every session at the show featured a customer and the tremendous success or transformation Oracle MDM resulted in at their organization.  At the DemoGrounds, Oracle MDM saw tremendous interest with many individuals enquiring to see demos, and have their technical questions answered.  The demos provided a perfect opportunity to showcase technical enhancements as well as what features are on the horizon.The MDM customer appreciation dinner event was a smashing success as cusotmers and partners enjoyed a spectacular water view, fine dining and cocktails and one of San Francisco's finest restaurants - The Water Bar.  In a short while the planning for next year's OpenWorld will be under full swing and we can't wait to get started.  See you at OOW 2013!!    

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• Interviews that include Algorithms and Data Structures

  - by EricFromSouthPark

  I want to start looking for jobs in great companies and I have four years of enterprise corporations development, three years with C#.NET and alomst one year with Ruby On Rails, JS, etc... But when I look up interview questions from Google, Amazon, Fog Creek, DropBox, etc... they are really targeted at students that are coming fresh out of college and still remember what was Dynamic Programming and Dijkstra algorithms ... but I don't! :( It has been a while for me ... If a I need a sort algorithm I would either Google it or there already is a library and method that does it for me. So what should I do? Do they realize that this guy is not coming from college and will ask more general questions about software architecture or nop! I should go back find my old Data structures book from the storage and read them? In that case wht books and language do you recommend to hone my skills?

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• Hitachi Data Systems definition of cloud

  - by llaszews

  1. Ability to rapidly provision and de-provision a service. (aka: provisioning) 2. A consumption model where users pay for what they use. (aka: chargeback and showback) 3. The agility to flexibly scale - 'flex up' or 'flex down' - the services without extensive pre-planning. (aka: elasticity) 4. Secure, direct connection to the cloud without having to recode applications (aka: internet-based) 5. Multi-tenancy capabilitites that segregate and protect the data. (as it says multi-tenancy) Happen to be I have been talking about 4 of the 5. Did not mention connection to internet as assumed this.

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• Mahout - Clustering - "naming" the cluster elements

  - by Mark Bramnik

  I'm doing some research and I'm playing with Apache Mahout 0.6 My purpose is to build a system which will name different categories of documents based on user input. The documents are not known in advance and I don't know also which categories do I have while collecting these documents. But I do know, that all the documents in the model should belong to one of the predefined categories. For example: Lets say I've collected a N documents, that belong to 3 different groups : Politics Madonna (pop-star) Science fiction I don't know what document belongs to what category, but I know that each one of my N documents belongs to one of those categories (e.g. there are no documents about, say basketball among these N docs) So, I came up with the following idea: Apply mahout clustering (for example k-mean with k=3 on these documents) This should divide the N documents to 3 groups. This should be kind of my model to learn with. I still don't know which document really belongs to which group, but at least the documents are clustered now by group Ask the user to find any document in the web that should be about 'Madonna' (I can't show to the user none of my N documents, its a restriction). Then I want to measure 'similarity' of this document and each one of 3 groups. I expect to see that the measurement for similarity between user_doc and documents in Madonna group in the model will be higher than the similarity between the user_doc and documents about politics. I've managed to produce the cluster of documents using 'Mahout in Action' book. But I don't understand how should I use Mahout to measure similarity between the 'ready' cluster group of document and one given document. I thought about rerunning the cluster with k=3 for N+1 documents with the same centroids (in terms of k-mean clustering) and see whether where the new document falls, but maybe there is any other way to do that? Is it possible to do with Mahout or my idea is conceptually wrong? (example in terms of Mahout API would be really good) Thanks a lot and sorry for a long question (couldn't describe it better) Any help is highly appreciated P.S. This is not a home-work project :)

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• C# and SQL data layer code generator

  I've created a simple yet efficient tool to help generate stored procedures and a C# data access layer from a table.  Instead of using an ORM, this uses standard ADO .NET (SqlConnection, SqlDataReader, etc).  Check it out at www.asteio.com.  It's saved me a ton of time and I'm hoping it does the same for you....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• 3D Box Collision Data Import

  - by cboe

  I'm trying to implement a collision system using oriented bounding boxes, using a center for the box, it's extents as a 3D Vector and a rotation matrix, which is all stuff I picked up online and seem to be somewhat the standard. Detecting the center is no problem so I'm gonna leave these out here. My problem however is importing the data from a 3D file. Say I've placed a box with 2 units length on each side aligned to the world axis. The logic results here are extents of 1,1,1 and I use an identity matrix for rotation - easy. However I'm stuck when I rotate the box in the 3D program, say 30 degrees each axis. How would I parse the box? I only have these 8 vertices as information, and I guess what I would need to do is to find out the rotation of said box, apply it to the vertices so they are aligned to world axes and then calculate the extents out of that. How do I get the rotation of the box when I only have the vertex information of the box available?

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• SSRS Reports as a Data Source in Excel 2013

  DBAs are expected to know how to administer the technologies that are available with and peripheral to SQL Server. To properly administer them, it certainly helps to understand the technology from the point of view of the user. By using an existing SSRS report as a data feed for Excel, Rodney Landrum explains how these users can now take advantage of development efforts in new ways. The seven tools in the SQL DBA Bundle support your core SQL Server database administration tasks.Make backups a breeze! Enjoy trouble-free troubleshooting! Make the most of monitoring! Download a free trial now.

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• Design Pattern for Data Validation

  - by melodui

  What would be the best design pattern for this problem: I have an Object A. Object A can either be registered or deleted from the database depending on the user request. Data validation is performed before registration or deletion of the object. There are a set of rules to be checked before the object can be registered and another set of rules for deletion. Some of these rules are common for both operations. So far, I think the Chain of Responsibility design pattern fits the most but I'm having trouble implementing it.

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• How does Google store search trends in backend?

  - by Achshar

  Google trends shows what query has been searched how many times and some other properties of the said query. But how is this data stored in a database? Storing a new row for every search does not seem right. They also tell the query on a time graph, so they must have some way to look for individual searches made by users, but the number of queries they get every day, it does not feel right that they would store every search in a database row along with a time-stamp. This does not apply to just Google trends or Google in general but any other big site that gets awful number of queries and then has tools to see them in depth. I am not an expert on this but I am interested to know some high level structure of how things work behind the scenes.

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• Using "MTNL 3G Jadoo" data card on Ubuntu

  - by amolbk

  I am trying to use "MTNL 3G Jadoo" data card (Teracom LW272) with Ubuntu 12.04. On connecting, it gets mounted as a drive containing the client installation .deb file. I opened the .deb file in Ubuntu Software Center and installed it. I searched for "MTNL" in Ubuntu search and found "MTNL 3G Modem" application. But it won't run. I found it is installed in /opt/MTNL-3GModem. I tried running it from the terminal as: sudo /opt/MTNL-3GModem/ModemClient, but no luck. Any idea how to get it working?

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• Settlers-like terrain representation

  - by Olle

  Remember this beauty? I'm playing it now on my old Amiga 1200. My question is: How do you think they represented the terrain, data structure wise? Obviously it's some kind of points, with a height. Or hexagons. And how did they decide which dots were buildable? EDIT: I could rephrase the question to say "how do I achieve this kind of terrain", but I would still only be interested in how to do it on a machine with 1 MB of RAM and a 7 Mhz processor, because this is the machine i currently developing games for. If that seems like a vague or meaningless question to you, that's alright, but I'm still curious if someone has any knowledge about this.

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• Will there be data loss for upgrade?

  - by Tim

  I am planning to upgrade from 8.10 to 10.04. But I am wondering if there will be data loss during the upgrade? For example: Will the application that I have installed on 8.10 still be there after upgrade? Will the settings of the applications such as the bookmarks for Firefox and for Google Chrome be preserved? Will all the personal files under my home directory be preserved? Any other things I need to know for the upgrade? Thanks and regards!

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