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• Entity Framework 4.0: My Favorite Books

  - by nannette

  I'm in the process of reading several Entity Framework 4.0 books. I'm going to recommend two such books: 1) Programming Entity Framework: Building Data Centric Apps with the ADO.NET Entity Framework by Julia Lerman 2) Entity Framework 4.0 Recipes: A Problem-Solution Approach by Larry Tenny and Zeeshan Hirani Visit these Entity Framework 4.0 Quick Start videos by Julia Lerman. The book links include numerous detailed reviews. If you can only afford one of the books, I'd recommend Julia's book as the...(read more)

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• Web Site Search Engines - Sending Your Site to Search Engine Sites

  Search engines are number one cost effective approach to market your business and web site. Studies indicate that vast majority viewers find web sites via leading search engines and directories. Quality listing on leading search engine or directory may drive targeted traffic to your website and improve your business in a short period of time.

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• Visual WebGui's XAML based programming for web developers

  - by Webgui

  While ASP.NET provides an event base approach it is completely dismissed when working with AJAX and the richness of the server is lost and replaced with JavaScript programming and couple with a very high security risk. Visual WebGui reinstates the power of the server to AJAX development and provides a statefull yet scalable, server centric architecture that provides the benefits and user productivity of AJAX with the security and developer productivity we had before AJAX stormed into our lives. "When I first came up with the concept of Visual WebGui , I was frustrated by the fragile and complex nature of developing web applications. The contrast in productivity between working in a fully OOP compiled environment vs. scripting even today, with JQuery, Dojo and such, is still huge. Even today the greatest sponsor of JavaScript programming, Google, is offering a framework to avoid JavaScript using Java that compiles to JavaScript (GWT). So I decided to find a way to abstract the complexity or rather delegate the complex job to enable developers to concentrate on the “What” instead of the “How” and embraced the Form based approach," said Guy Peled the inventor of Visual WebGui. Although traditional OOP development still rules the enterprise, the differences between web sites and web applications have blurred and so did the differences between classic developers and web developers. As a result, we now see declarative languages in desktop / backend development environments (WPF / WF) and we see OOP, gaining more and more power in web development (ASP.NET MVC / ASP.NET DOM). However, what has not changed is enterprise need for security, development ROI, reach, highly responsive and interactive UIs and scalability. The advantages that declarative languages and 'on demand' compilation provide over classic development are mostly the flexibility and a more readable initialize component it offers which is what Gizmox is aspiring to do by replacing the designer initialize component with XAML code. The code in this new project template will be compiled on demand using the build provider mechanism ASP.NET has. This means that the performance hit is only on the first request and after that the performance is the same as a prebuilt solution. This will allow the flexibility of a dynamically updated sites and the power of fully blown enterprise applications over web. You can also use prebuilt features available in ASP.NET to enjoy both worlds in production. VWG XAML implementation (VWG Sites) will be the first truly compliable XAML implementation as Microsoft implemented Silverlight and WPF as a runtime markup interpretation opposed to the ASP.NET markup implementation which is compiled to CLR code once. We have chosen to implement the VWG Sites parser as a different way to create CLR code that provides greater performance over the reflection alternative. VWG Sites will also be the first server side XAML UI engine which, while giving the power of XAML, it will not require any plug-ins or installations on the client side. Short demo video of VWG Sites markup. There is also a live sample available here.

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• Walmart's Mobile Self-Checkout

  - by David Dorf

  Reuters recently reported that Walmart was testing an iPhone-based self-checkout at a store near its headquarters.  Consumers scan items as they're placed in the physical basket, then the virtual basket is transferred to an existing self-checkout station where payment is tendered.  A very solid solution, but not exactly original. Before we go further, let's look at the possible cost savings for Walmart.  According to the article: Pushing more shoppers to scan their own items and make payments without the help of a cashier could save Wal-Mart millions of dollars, Chief Financial Officer Charles Holley said on March 7. The company spends about $12 million in cashier wages every second at its Walmart U.S. stores. Um, yeah. Using back-of-the-napkin math, I calculated Walmart's cashiers are making $157k per hour.  A more accurate statement would be saving $12M per year for each second saved on the average transaction time.  So if this self-checkout approach saves 2 seconds per transaction on average, Walmart would save $24M per year on labor.  Maybe.  Sometimes that savings will be used to do other tasks in the store, so it may not directly translate to less employees. When I saw this approach demonstrated in Sweden, there were a few differences, which may or may not be in Walmart's plans.  First, the consumers were identified based on their loyalty card.  In order to offset the inevitable shrink, retailers need to save on labor but also increase basket size, typically via in-aisle promotions.  As they scan items, retailers should target promos, and that's easier to do if you know some shopping history.  Last I checked, Walmart had no loyalty program. Second, at the self-checkout station consumers were randomly selected for an audit in which they must re-scan all the items just like you do at a typical self-checkout.  If you were found to be stealing, your ability to use the system can be revoked.  That's a tough one in the US, especially when the system goes wrong, either by mistake or by lying.  At least in my view, the Swedes are bit more trustworthy than the people of Walmart. So while I think the idea of mobile self-checkout has merit, perhaps its not right for Walmart.

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• Webcast Q&A: ING on How to Scale Role Management and Compliance

  - by Tanu Sood

  Thanks to all who attended the live webcast we hosted on ING: Scaling Role Management and Access Certifications to Thousands of Applications on Wed, April 11th. Those of you who couldn’t join us, the webcast replay is now available. Many thanks to our guest speaker, Mark Robison, Enterprise Architect at ING for walking us through ING’s drivers and rationale for the platform approach, the phased implementation strategy, results & metrics, roadmap and recommendations. We greatly appreciate the insight he shared with us all on the deployment synergies between Oracle Identity Manager (OIM) and Oracle Identity Analytics (OIA) to enforce streamlined user and role management and scalable compliance. Mark was also kind enough to walk us through specific solutions features that helped ING manage the problem of role explosion and implement closed loop remediation. Our host speaker, Neil Gandhi, Principal Product Manager, Oracle rounded off the presentation by discussing common use cases and deployment scenarios we see organizations implement to automate user/identity administration and enforce closed-loop scalable compliance. Neil also called out the specific features in Oracle Identity Analytics 11gR1 that cater to expediting and streamlining compliance processes such as access certifications. While we tackled a few questions during the webcast, we have captured the responses to those that we weren’t able to get to here; our sincere thanks to Mark Robison for taking the time to respond to questions specific to ING’s implementation and strategy. Q. Did you include business friendly entitlment descriptions, or is the business seeing application descriptors A. We include very business friendly descriptions.  The OIA tool has the facility to allow this. Q. When doing attestation on job change, who is in the workflow to review and confirm that the employee should continue to have access? Is that a best practice?   A. The new and old manager  are in the workflow.  The tool can check for any Separation of Duties (SOD) violations with both having similiar accesses.  It may not be a best practice, but it is a reality of doing your old and new job for a transition period on a transfer. Q. What versions of OIM and OIA are being used at ING?   A. OIM 11gR1 and OIA 11gR1; the very latest versions available. Q. Are you using an entitlements / role catalog?   A. Yes. We use both roles and entitlements. Q. What specific unexpected benefits did the Identity Warehouse provide ING?   A. The most unanticipated was to help Legal Hold identify user ID's in the various applications.   Other benefits included providing a one stop shop for all aggregated ID information. Q. How fine grained are your application and entitlements? Did OIA, OIM support that level of granularity?   A. We have some very fine grained entitlements, but we role this up into approved Roles to allow for easier management.   For managing very fine grained entitlements, Oracle offers the Oracle Entitlement Server.  We currently do not own this software but are considering it. Q. Do you allow any individual access or is everything truly role based?   A. We are a hybrid environment with roles and individual positive and negative entitlements Q. Did you use an Agile methodology like scrum to deliver functionality during your project? A. We started with waterfall, but used an agile approach to provide benefits after the initial implementation Q. How did you handle rolling out the standard ID format to existing users? A. We just used the standard IDs for new users.  We have not taken on a project to address the existing nonstandard IDs. Q. To avoid role explosion, how do you deal with apps that require more than a couple of entitlement TYPES? For example, an app may have different levels of access and it may need to know the user's country/state to associate them with particular customers.   A. We focus on the functional user and craft the role around their daily job requirements.  The role captures the required application entitlements.  To keep role explosion down, we use role mining in OIA and also meet and interview the business.  It is an iterative process to get role consensus. Q. Great presentation! How many rounds of Certifications has ING performed so far?  A. Around 7 quarters and constant certifications on transfer. Q. Did you have executive support from the top down   A. Yes  The executive support was key to our success. Q. For your cloud instance are you using OIA or OIM as SaaS?  A. No.  We are just provisioning and deprovisioning to various Cloud providers.  (Service Now is an example) Q. How do you ensure a role owner does not get more priviliges as are intended and thus violates another role, e,g, a DBA Roles should not get tor rigt to run somethings as root, as this would affect the root role? A. We have SOD  checks.  Also all Roles are initially approved by external audit and the role owners have to certify the roles and any changes Q. What is your ratio of employees to roles?   A. We are still in process going through our various lines of business, so I do not have a final ratio.  From what we have seen, the ratio varies greatly depending on the Line of Business and the diversity of Job Functions.  For standardized lines of business such as call centers, the ratio is very good where we can have a single role that covers many employees.  For specialized lines of business like treasury, it can be one or two people per role. Q. Is ING using Oracle On Demand service ?   A. No Q. Do you have to implement or migrate to OIM in order to get the Identity Warehouse, or can OIA provide the identity warehouse as well if you haven't reached OIM yet? A. No, OIM deployment is not required to implement OIA’s Identity Warehouse but as you heard during the webcast, there are tremendous deployment synergies in deploying both OIA and OIM together. Q. When is the Security Governor product coming out? A. Oracle Security Governor for Healthcare is available today. Hope you enjoyed the webcast and we look forward to having you join us for the next webcast in the Customers Talk: Identity as a Platform webcast series: Toyota: Putting Customers First – Identity Platform as a Business Enabler Wednesday, May 16th at 10 am PST/ 1 pm EST Register Today You can also register for a live event at a city near you where Aberdeen’s Derek Brink will discuss the survey results from the recently published report “Analyzing Platform vs. Point Solution Approach in Identity”. And, you can do a quick (& free)  online assessment of your identity programs by benchmarking it against the 160 organizations surveyed  in the Aberdeen report, compliments of Oracle. Here’s the slide deck from our ING webcast: ING webcast platform View more presentations from OracleIDM

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• How to export 3D models that consist of several parts (eg. turret on a tank)?

  - by Will

  What are the standard alternatives for the mechanics of attaching turrets and such to 3D models for use in-game? I don't mean the logic, but rather the graphics aspects. My naive approach is to extend the MD2-like format that I'm using (blender-exported using a script) to include a new set of properties for a mesh that: is anchored in another 'parent' mesh. The anchor is a point and normal in the parent mesh and a point and normal in the child mesh; these will always be colinear, giving the child rotation but not translation relative to the parent point. has a normal that is aligned with a 'target'. Classically this target is the enemy that is being engaged, but it might be some other vector e.g. 'the wind' (for sails and flags (and smoke, which is a particle system but the same principle applies)) or 'upwards' (e.g. so bodies of riders bend properly when riding a horse up an incline etc). that the anchor and target alignments have maximum and minimum and a speed coeff. there is game logic for multiple turrets and on a model and deciding which engages which enemy. 'primary' and 'secondary' or 'target0' ... 'targetN' or some such annotation will be there. So to illustrate, a classic tank would be made from three meshes; a main body mesh, a turret mesh that is anchored to the top of the main body so it can spin only horizontally and a barrel mesh that is anchored to the front of the turret and can only move vertically within some bounds. And there might be a forth flag mesh on top of the turret that is aligned with 'wind' where wind is a function the engine solves that merges environment's wind angle with angle the vehicle is travelling in an velocity, or something fancy. This gives each mesh one degree of freedom relative to its parent. Things with multiple degrees of freedom can be modelled by zero-vertex connecting meshes perhaps? This is where I think the approach I outlined begins to feel inelegant, yet perhaps its still a workable system? This is why I want to know how it is done in professional games ;) Are there better approaches? Are there formats that already include this information? Is this routine?

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• How to suggest using an ORM instead of stored procedures?

  - by Wayne M

  I work at a company that only uses stored procedures for all data access, which makes it very annoying to keep our local databases in sync as every commit we have to run new procs. I have used some basic ORMs in the past and I find the experience much better and cleaner. I'd like to suggest to the development manager and rest of the team that we look into using an ORM Of some kind for future development (the rest of the team are only familiar with stored procedures and have never used anything else). The current architecture is .NET 3.5 written like .NET 1.1, with "god classes" that use a strange implementation of ActiveRecord and return untyped DataSets which are looped over in code-behind files - the classes work something like this: class Foo { public bool LoadFoo() { bool blnResult = false; if (this.FooID == 0) { throw new Exception("FooID must be set before calling this method."); } DataSet ds = // ... call to Sproc if (ds.Tables[0].Rows.Count > 0) { foo.FooName = ds.Tables[0].Rows[0]["FooName"].ToString(); // other properties set blnResult = true; } return blnResult; } } // Consumer Foo foo = new Foo(); foo.FooID = 1234; foo.LoadFoo(); // do stuff with foo... There is pretty much no application of any design patterns. There are no tests whatsoever (nobody else knows how to write unit tests, and testing is done through manually loading up the website and poking around). Looking through our database we have: 199 tables, 13 views, a whopping 926 stored procedures and 93 functions. About 30 or so tables are used for batch jobs or external things, the remainder are used in our core application. Is it even worth pursuing a different approach in this scenario? I'm talking about moving forward only since we aren't allowed to refactor the existing code since "it works" so we cannot change the existing classes to use an ORM, but I don't know how often we add brand new modules instead of adding to/fixing current modules so I'm not sure if an ORM is the right approach (too much invested in stored procedures and DataSets). If it is the right choice, how should I present the case for using one? Off the top of my head the only benefits I can think of is having cleaner code (although it might not be, since the current architecture isn't built with ORMs in mind so we would basically be jury-rigging ORMs on to future modules but the old ones would still be using the DataSets) and less hassle to have to remember what procedure scripts have been run and which need to be run, etc. but that's it, and I don't know how compelling an argument that would be. Maintainability is another concern but one that nobody except me seems to be concerned about.

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• Linkedin recommendations, useful? [closed]

  - by scottyab

  Linkedin has been around a few years now and while not everyone is keen on it. Chatting to a few people they viewed Linkedin recommendations as mutual back starching where poor candidates can recommend each other and and provide little value. I take a honest approach when recommending colleagues, trying to note specifics that person has performed well at and don't recommend colleagues on linkedin who wouldn't recommend in real life. What regard do people hold the Linkedin recommendations? would it effect your hiring decision?

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• Developing a Streaming Pipeline Component for BizTalk Server

  - by Rajesh Charagandla

  This paper shows how to address issues with high memory consumption and latency by taking a streaming approach to pipeline component development. Download Link: http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=bb88dafd-9bba-4d6b-b276-cd7e205f8896

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• Is the STL efficient enough for mobile devices?

  - by mx2

  When it comes to mobile game development on iOS and Android NDK, some developers write their own C++ containers, while others claim that STL is more than adequate for mobile game development (For example, the author of iPhone 3D Programming uses STL rather than Objective-C in his examples. His defense is that STL is no slower than Objective-C). Then there are also mobile developers who abandon C++ entirely and develop games entirely (or mostly) in the C language (C89/C90). What are the benefits and drawbacks of each approach?

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• Creating an interactive grid for a puzzle game

  - by Noupoi

  I am trying to make a slitherlink game, and am not too sure how to approach creating the game, more specifically the grid structure on which the puzzle will be played on. This is what a empty and completed slitherlink grid would look like: The numbers in the squares are sort of clues and the areas between the dots need to be clickable: I would like to create the game in VB .NET. What data structures should I try to use, and would it be beneficial using any frameworks such as XNA?

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• APress Deal of the Day - 19/June/2011

  - by TATWORTH

  Today's $10 Apress Deal of the Day from Apress at http://www.apress.com/ is Visual C# 2010 Recipes - A Problem-Solution Approach "When you are facing a Visual C# 2010 problem, this book likely contains a recipe providing the solution—or at least points you in the right direction. Even if you are simply looking to broaden your knowledge of the .NET Framework class library, Visual C# 2010 Recipes is the perfect resource to assist you."

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• How to implement explosion in OpenGL?

  - by Chan

  I'm relatively new to OpenGL and I'm clueless how to implement explosion. So could anyone give me some ideas how to start? Suppose the explosion occurs at location $(x, y, z)$, then I'm thinking of randomly generate a collection of vectors with $(x, y, z)$ as origin, then draw some particle (glutSolidCube) which move along this vector for some period of time, says after 1000 updates, it disappear. Is this approach feasible? A minimal example would be greatly appreciated.

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• Creating advanced website by redirecting and replacing content from Google Sites

  - by David

  I would like to create a corporate website with members area. Importantly, I want many novice webadmins to be able to modify static content themselves. Therefore, I got the idea to create the site using Google Sites and insert elements with width and height in places where I want dynamic content. The website would be read using PHP on a different server and the marker elements would be replaced with dynamic content created by PHP. What would be the drawbacks of this approach?

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• How to do directional per fragment lighting in world space?

  - by user

  I am attempting to create a GLSL shader for simple, per-fragment directional light. So far, after following many tutorials, I have continually ran into the issue: my light is specified in world coordinates, however, the shader treats the light's position as being in eye space, thus, the light direction changes when I move the camera. My question is, how to I transform a directional light position such as (50, 50, 50, 0) into eye space, or, would doing things this way be the incorrect approach to the problem?

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• What should come first: testing or code review?

  - by Silver Light

  Hello! I'm quite new to programming design patterns and life cycles and I was wondering, what should come first, code review or testing, regarding that those are done by separate people? From the one side, why bother reviewing code if nobody checked if it even works? From the other, some errors can be found early, if you do the review before testing. Which approach is recommended and why? Thank you!

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• Script to create or drop all primary keys now on TechNet Wiki.

  - by John Paul Cook

  I posted my script to create or drop all primary keys on the TechNet Wiki. You can find it at http://social.technet.microsoft.com/wiki/contents/articles/script-to-create-or-drop-all-primary-keys.aspx . I first published the script here in 2009 and I've always wanted a way for the community to enhance it or correct it. The TechNet Wiki makes that possible. Visit the Wiki and see if you like this approach to publishing scripts....(read more)

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• C# Dev - I've tried Lisps, but I don't get it.

  - by Jonathan Mitchem

  After a few months of learning about and playing with lisps, both CL and a bit of Clojure, I'm still not seeing a compelling reason to write anything in it instead of C#. I would really like some compelling reasons, or for someone to point out that I'm missing something really big. The strengths of a Lisp (per my research): Compact, expressive notation - More so than C#, yes... but I seem to be able to express those ideas in C# too. Implicit support for functional programming - C# with LINQ extension methods: mapcar = .Select( lambda ) mapcan = .Select( lambda ).Aggregate( (a,b) = a.Union(b) ) car/first = .First() cdr/rest = .Skip(1) .... etc. Lambda and higher-order function support - C# has this, and the syntax is arguably simpler: "(lambda (x) ( body ))" versus "x = ( body )" "#(" with "%", "%1", "%2" is nice in Clojure Method dispatch separated from the objects - C# has this through extension methods Multimethod dispatch - C# does not have this natively, but I could implement it as a function call in a few hours Code is Data (and Macros) - Maybe I haven't "gotten" macros, but I haven't seen a single example where the idea of a macro couldn't be implemented as a function; it doesn't change the "language", but I'm not sure that's a strength DSLs - Can only do it through function composition... but it works Untyped "exploratory" programming - for structs/classes, C#'s autoproperties and "object" work quite well, and you can easily escalate into stronger typing as you go along Runs on non-Windows hardware - Yeah, so? Outside of college, I've only known one person who doesn't run Windows at home, or at least a VM of Windows on *nix/Mac. (Then again, maybe this is more important than I thought and I've just been brainwashed...) The REPL for bottom-up design - Ok, I admit this is really really nice, and I miss it in C#. Things I'm missing in a Lisp (due to a mix of C#, .NET, Visual Studio, Resharper): Namespaces. Even with static methods, I like to tie them to a "class" to categorize their context (Clojure seems to have this, CL doesn't seem to.) Great compile and design-time support the type system allows me to determine "correctness" of the datastructures I pass around anything misspelled is underlined realtime; I don't have to wait until runtime to know code improvements (such as using an FP approach instead of an imperative one) are autosuggested GUI development tools: WinForms and WPF (I know Clojure has access to the Java GUI libraries, but they're entirely foreign to me.) GUI Debugging tools: breakpoints, step-in, step-over, value inspectors (text, xml, custom), watches, debug-by-thread, conditional breakpoints, call-stack window with the ability to jump to the code at any level in the stack (To be fair, my stint with Emacs+Slime seemed to provide some of this, but I'm partial to the VS GUI-driven approach) I really like the hype surrounding Lisps and I gave it a chance. But is there anything I can do in a Lisp that I can't do as well in C#? It might be a bit more verbose in C#, but I also have autocomplete. What am I missing? Why should I use Clojure/CL?

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• How to Start Using Apps to Enhance Your Web 3.0 Marketing Activities - Web Site Design Services

  Step 1: Brainstorm. We like to take a different approach to apps. Instead of first looking at what?s out there, we brainstorm on what apps we would like to see and what those apps would do. For exam... [Author: Michael Tasner - Web Design and Development - June 06, 2010]

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• 3d point cloud reconstruction using in c++

  - by techie_db

  I've got a project which involves 3D reconstruction if point clouds from a 3D scanner. Being relatively new to the computer vision field I'm in the dark. The objective of the project is to implement this 3D reconstruction in C/C++ without using Matlab so that it can be further integrated with the ROS (for robots). Can anyone guide me with this issue so that I get enough idea regarding how to approach the problem?

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• Behaviour Trees with irregular updates

  - by Robominister

  I'm interested in behaviour trees that aren't iterated every game tick, but every so often. (Edit: the tree could specify how many frames within the main game loop to wait before running its tick function again). Every theoretical implementation I have seen of behaviour trees talks of the tree search being carried out every game update - which seems necessary, because a leaf node (eg a behaviour, like 'return to base') needs to be constantly checked to see if is still running, failed or completed. Can anyone suggest how I might start implementing a tree that isnt run every tick, or point me in the direction of good material specific to this case (I am struggling to find anything)? My thoughts so far: action leaf nodes (when they start) must only push some kind of action object onto a list for an entity, rather than directly calling any code that makes the entity do something. The list of actions for the entity would be run every frame (update any that need to run, pop any that have completed from the list). the return state from a given action must be fed back into the tree, so that when we run the tree iteration again (and reach the same action leaf node - so the tree has so far determined that we ought to still be trying this action) - that the action has completed, or is still running etc. If my actual action code is running from an action list on an entity, then I possibly need to cancel previously running actions in the list - i am thinking that I can just delete the entire stack of queued up actions. I've seen the idea of ActionLists which block lower priority actions when a higher priority one is added, but this seems like very close logic to behaviour trees, and I dont want to be duplicating behaviour. This leaves me with some questions 1) How would I feed the action return state back into the tree? Its obvious I need to store some information relating to 'currently executing actions' on the entity, and check that in the tree tick, but I can't imagine how. 2) Does having a seperate behaviour tree (for deciding behaviour) and action list (for carrying out actual queued up actions) sound like a reasonable approach? 3) Is the approach of updating a behaviour tree irregularly actually used by anyone? It seems like a nice idea for budgeting ai search time when you have a lot of ai entities to process. (Edit) - I am also thinking about storing a single instance of a given behaviour tree in memory, and providing it by reference to any entity that uses it. So any information about what action was last selected for execution on an entity must be stored in a data context relative to the entity (which the tree can check). (I am probably answering my own questions as i go!) I hope I have expressed my questions adequately! Thanks in advance for any help :)

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• Design pattern to handle queries using multiple models

  - by coderkane

  I am presented with a dilemma while trying to re-designing the class structure for my PHP/MySQL application to make it more elegant and conform it to the SOLID principle. The problem goes like this: Let as assume, there is an abstract class called person which has certain properties to define a generic person, such as name, age, date of birth etc. There are two classes, student, and teacher, that implements this abstract class. They add their own unique properties to it. I have designed all the three classes to include all the operational logic (details of which are not relevant in context of the question). Now, I need to create views/reports/data grids which contain details from multiple classes, for example, say, a list of all students doing projects in Chemistry mentored by a teacher whose name is the parameter to the query. This is just one example of a view, there are many different views in the application, which uses data from 3-4 tables, and each of them have multiple input parameters to generate them. Considering this particular example, I have written the relevant query using JOIN and the results are as expected and proper, now here is the dilemma: Keeping in mind the single responsibility principle, where should I keep this query? It does not belong to either Student class, or Teacher class or any other classes currently present. a) Should I create a new class, say dataView class, and design it as a MVC pattern and keep the query there? What about the other views? how do they fit in this architecture? b) Should I not keep the query in code at all, and make it DB View ? c) Am I completely wrong in the approach? If so what is the right approach? My considerations are as follows: a) should be easy to add new views later on if requirement comes, without having to copy-paste-modify code b) would like to make it as loosely coupled as possible so that if minor db structure changes happen, it does not break I did google searches on report design and OOP report generators, but all the result seem to focus on the visual design of the report rather than fetching the data. I have already taken care of the visual aspect of the report using MVC with html templates. I am sure this is a very fundamental problem with known solution, but I am somehow not able to find it (maybe searching with wrong keyword). Edit1: Modified the title to make it more relevant Edit2: The accepted answer got me thinking in the right direction and identify my design flaws, which eventually led me to find this question and the solution in Stack Overflow which gave me the detailed answer to clear the confusion.

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• Headaches using distributed version control for traditional teams?

  - by J Cooper

  Though I use and like DVCS for my personal projects, and can totally see how it makes managing contributions to your project from others easier (e.g. your typical Github scenario), it seems like for a "traditional" team there could be some problems over the centralized approach employed by solutions like TFS, Perforce, etc. (By "traditional" I mean a team of developers in an office working on one project that no one person "owns", with potentially everyone touching the same code.) A couple of these problems I've foreseen on my own, but please chime in with other considerations. In a traditional system, when you try to check your change in to the server, if someone else has previously checked in a conflicting change then you are forced to merge before you can check yours in. In the DVCS model, each developer checks in their changes locally and at some point pushes to some other repo. That repo then has a branch of that file that 2 people changed. It seems that now someone must be put in charge of dealing with that situation. A designated person on the team might not have sufficient knowledge of the entire codebase to be able to handle merging all conflicts. So now an extra step has been added where someone has to approach one of those developers, tell him to pull and do the merge and then push again (or you have to build an infrastructure that automates that task). Furthermore, since DVCS tends to make working locally so convenient, it is probable that developers could accumulate a few changes in their local repos before pushing, making such conflicts more common and more complicated. Obviously if everyone on the team only works on different areas of the code, this isn't an issue. But I'm curious about the case where everyone is working on the same code. It seems like the centralized model forces conflicts to be dealt with quickly and frequently, minimizing the need to do large, painful merges or have anyone "police" the main repo. So for those of you who do use a DVCS with your team in your office, how do you handle such cases? Do you find your daily (or more likely, weekly) workflow affected negatively? Are there any other considerations I should be aware of before recommending a DVCS at my workplace?

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• A new Excel 2010 book for Data Analysis

  - by Marco Russo (SQLBI)

  Microsoft Press just announced the printing of Microsoft Excel 2010: Data Analysis and Business Modeling , which is the third edition of the book written by Wayne L. Winston covering many data analysis and modeling techniques using a very clear problem-solution approach, including a good statistical explanation whenever it is necessary. I suggest this book as a good complement to our Microsoft PowerPivot for Excel 2010: Give Your Data Meaning !...(read more)

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• How to implement explosion in OpenGL with a particle effect?

  - by Chan

  I'm relatively new to OpenGL and I'm clueless how to implement explosion. So could anyone give me some ideas how to start? Suppose the explosion occurs at location $(x, y, z)$, then I'm thinking of randomly generate a collection of vectors with $(x, y, z)$ as origin, then draw some particle (glutSolidCube) which move along this vector for some period of time, says after 1000 updates, it disappear. Is this approach feasible? A minimal example would be greatly appreciated.

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