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  • Emoti-phrases

    - by Tony Davis
    Surely the next radical step in the development of User-interface design is for applications to react appropriately to the rising tide of bewilderment, frustration or antipathy of the users. When an application understands that rapport is lost, it should respond accordingly. When we, for example, become confused by an unforgiving interface, shouldn't there be a way of signalling our bewilderment and having the application respond appropriately? There is surprisingly little in the current interface standards that would help. If we're getting frustrated with an unresponsive application, perhaps we could let it know of our increasing irritation by means of an "I'm getting angry and exasperated" slider. Although, by 'responding appropriately', I don't include playing a "we are experiencing unusually heavy traffic: your application usage is important to us" message, accompanied by calming muzak. When confronted with a tide of wizards, 'are you sure?' messages, or page-after-page of tiresome and barely-relevant options, how one yearns for a handy 'JFDI' (Just Flaming Do It) button. One click and the application miraculously desists with its annoying questions and just gets on with the job, using the defaults, or whatever we selected last time. Much more satisfying, and more direct to most developers and DBAs, however, would be the facility to communicate to the application via a twitter-style input field, or via parameters to command-line applications ("I don't want a wide-ranging debate with you; just open the bl**dy PDF!" or, or "Don't forget which of us has the close button"). Although to avoid too much cultural-dependence, perhaps we should take the lead from emoticons, and use a set of standardized emoti-phrases such as 'sez you', 'huh?', 'Pshaw!', or 'meh', which could be used to vent a range of feelings in any given application, whether it be SQL Server stubbornly refusing to give us the result we are expecting, or when an online-survey is getting too personal. Or a 'Lingua Glaswegia' perhaps: 'Atsabelter' ("very good") 'Atspish' ("must try harder") 'AnThenYerArsFellAff ' ("I don't quite trust these results") 'BileYerHeid' or 'ShutYerGub' ("please stop these inane questions") There would, of course, have to be an ANSI standards body to define the phrases that were acceptable. Presumably, there would be a tussle amongst the different international standards organizations. Meanwhile Oracle, Microsoft and Apple would each release non-standard extensions. Time then, surely, to plant emoti-phrases on the lot of them and develop a user-driven consensus. Send us your suggestions! The best one will win an iPod nano! Cheers! Tony.

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  • Monitora&ccedil;&atilde;o com Oracle Enteprrise Manager

    - by fernando.galdino
    A figura abaixo oferece uma visão geral das possibilidades de monitoramento providas pelo Oracle Enterprise Manager (OEM), que é uma ferramenta que permite gerenciar a infraestrutura de TI da empresa. Um componente importante da solução é chanado OEM Grid Control. Esse componente permite gerenciar, visualizar e monitorar diversos elementos a partir de uma mesma console. E que elementos podem ser monitorados? No conceito utilizado pelo OEM, os elementos que podem ser monitorados são chamados de Targets, e esses targets envolvem a monitoração de hosts (Windows, Linux, Solaris), Banco de Dados, Middleware, Aplicações Web, Serviços que podem ser customizados pelo administrador, Sistemas e Grupos de targets, além dos aplicativos Oracle. Cada elemento monitorado é ativado através de packs de gerenciamento. Ou seja, há uma série de packs que podem ser adquiridas conforme a necessidade, para permitir a monitoração a partir do próprio OEM Grid Control. Existem packs de monitoramento especiais para banco de dados Oracle, packs de monitoramento para Tomcat, Jboss, WebLogic, SOA Suite, Identity Management. A lista é bem extensa e darei mais detalhes em um novo post. Mas caso queira visitar, veja: http://download.oracle.com/docs/cd/B16240_01/doc/nav/overview.htm Além das packs de monitoramento, existem também plugins e conectores. Os plugins permitem o gerenciamento de elementos adicionais, tais como dispositivos de rede, servidores, banco de dados de terceiros (DB2, SQL Server), Vmware, etc. Já os conectores permitem a integração com outros softwares, tais como gerenciadores de requisições de helpdesk, de modo a integrar os alertas gerados pela ferramenta e gerar tickets em ferramentas como CA Service Desk, BMC Remedy e outros. A extensão de funcionalidades é realmente bem vasta. Num próximo post irei comentar sobre o Ops Center, um novo componente que surgiu após a aquisição da Sun. Além do Grid Control e do Ops Center, há outros componentes bem interessantes. A figura abaixo ilustra diversas camadas onde o ferramental Oracle pode ser usado para monitoração. Há uma pack que permite gerenciar os níveis de serviços em todas as camadas ilustradas. Dada uma requisição, pode-se decompor os dados de SLA em cada camada. E há também o Real User Monitoring, que trata de medir a experiência com o usuário. Falarei disso num novo post, mas basicamente a ferramenta permite acompanhar todo o tráfego de rede gerado dos usuários finais até os servidores web, e com isso rastrear como cada usuário usa a aplicação, quanto tempo ele navega pelo site, se ele enfrentou algum tipo de problema, se houve algum pedido não finalizado devido a algum problema na infraestrutura. É uma ferramenta bem interessante, falarei um pouco mais dela depois. E claro, há também componentes para a realização de testes funcionais e de carga. Em breve, aqui no blog :)

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  • Three Ways to Get Started with MySQL Training

    - by Antoinette O'Sullivan
    Here is your chance to learn how this powerful relational database management system can make your life easier and more fun! This class covers all the basics and will get you on your way, with a solid foundation. This instructor led, hands-on class covers the fundamentals of SQL and relational databases, using MySQL[tm] as a teaching tool. You can take this 4 day instructor-led class in any of the following three ways: Training-On-Demand: See what Ben Krug, MySQL Support Engineer has to say about his experience taking the MySQL for Beginners TOD. With this streaming video delivery, you get started on taking the MySQL for Beginners course within 24 hrs of purchase, and follow the course at your own pace. Live-Virtual-Class: Take this class from your own desk - no travel required. There is a wide range of events on the schedule with delivery in English and German. In-Class: Travel to an education center to follow this class. Below is a sample of event on the schedule:  Location  Date  Delivery Language  Mechelen, Belgium  14 January 2013  English  London, England  3 December 2012  English  Hamburg, Germany  3 December 2012  German  Budapest, Hungary  5 February 2013  Hungarian  Riga, Latvia 18 February 2013   Latvian Amsterdam, Netherlands  10 December 2012  Dutch  Nieuwegein, Netherlands  18 February 2013  Dutch  Warsaw, Poland  26 November 2012   Polish  Lisbon, Portugal 25 March 2013  European Portugese   Porto, Portugal  25 March 2013  European Portugese  Barcelona, Spain 11 February 2013   Spanish  Madrid, Spain 8 January 2013   Spanish Nairobi, Kenya  14 January 2013   English  Cape Town, South Africa  22 July 2013  English  Pretoria, South Africa 22 April 2013  English Ottawa, Canada 17 December 2012  English  Toronto, Canada 17 December 2012   English  Montreal, Canada  17 December 2012 English  For more information on the Authentic MySQL Curriculum or to register your interest in an additional event, go to http://oracle.com/education/mysql. Note, many organizations deploy both Oracle Database and MySQL side by side to serve different needs, and as a database professional you can find training courses on both topics at Oracle University! Check out the upcoming Oracle Database training courses and MySQL training courses. Even if you're only managing Oracle Databases at this point of time, getting familiar with MySQL will broaden your career path with growing job demand.

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  • Technology Selection for a dynamic product

    - by Kuntal Shah
    We are building a product for Procurement Domain in JAVA. Following are the main technical requirements. Platform Independent Database Independent Browser Independent In functional requirements the product is very dynamic in nature. The main reason being the procurement process around the world is different from client to client. Briefly we need to have a dynamic workflow engine and a dynamic template engine. The workflow engine by which we can define any kind of workflows and the template engine allows us to define any kind of data structures and based on definition it can get the user input through workflow. We have been developing this product for almost 2 years. It has been a long time till we can get down with the dynamics of requirements. Till now we have developed a basic workflow and template engine and which is in use at one of the client. We have been using following technologies. GWT-Ext (Front End Framework) Hibernate (Database Layer) In between we have faced some issues with GWT-Ext (mainly browser compatibility) and database optimization due to sub classing in hibernate. For resolving GWT-Ext issue, which a dying community so we decided to move to SmartGWT. In SmartGWT we faced issues related to loading and now we are able to finalize that GWT 2.3 will be the way to go as the library is rich and performance is upto the mark. We are able to almost finalize GWT-Spring based front and middle layer. In hibernate, we found main issues with sub-classing due to that it was throwing astronomical queries and sometimes it would stop firing any queries for 5-10 seconds or may be around 30 seconds and then resume again. Few days back I came to one article related to ORM. I am a traditional .Net SQL developer and I have always worked with relational database. Reading through this article, I also found it relating to the issues I face. I am still not completely convinced of using hibernate and this article just supported my opinion. Following are the questions for which I am looking for an answer. Should we be going with Hibernate in case of dynamic database requirements and the load of the data will be heavy in future? How can we partition the data, how we can efficiently join the data, how we can optimize the queries? If the answer is no then how do we achieve database independence? Is our choice related to GWT and Spring proper or do we need to change that too? Should we use any other key value pair database if the data is dynamic in nature and it is very difficult to make it relational?

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  • Fair Comments

    - by Tony Davis
    To what extent is good code self-documenting? In one of the most entertaining sessions I saw at the recent PASS summit, Jeremiah Peschka (blog | twitter) got a laugh out of a sleepy post-lunch audience with the following remark: "Some developers say good code is self-documenting; I say, get off my team" I silently applauded the sentiment. It's not that all comments are useful, but that I mistrust the basic premise that "my code is so clearly written, it doesn't need any comments". I've read many pieces describing the road to self-documenting code, and my problem with most of them is that they feed the myth that comments in code are a sign of weakness. They aren't; in fact, used correctly I'd say they are essential. Regardless of how far intelligent naming can get you in describing what the code does, or how well any accompanying unit tests can explain to your fellow developers why it works that way, it's no excuse not to document fully the public interfaces to your code. Maybe I just mixed with the wrong crowd while learning my favorite language, but when I open a stored procedure I lose the will even to read it unless I see a big Phil Factor- or Jeff Moden-style header summarizing in plain English what the code does, how it fits in to the broader application, and a usage example. This public interface describes the high-level process and should explain the role of the code, clearly, for fellow developers, language non-experts, and even any non-technical stake holders in the project. When you step into the body of the code, the low-level details, then I agree that the rules are somewhat different; especially when code is subject to frequent refactoring that can quickly render comments redundant or misleading. At their worst, here, inline comments are sticking plaster to cover up the scars caused by poor naming conventions, failure in clarity when mapping a complex domain into code, or just by not entirely understanding the problem (/ this is the clever part). If you design and refactor your code carefully so that it is as simple as possible, your functions do one thing only, you avoid having two completely different algorithms in the same piece of code, and your functions, classes and variables are intelligently named, then, yes, the need for inline comments should be minimal. And yet, even given this, I'd still argue that many languages (T-SQL certainly being one) just don't lend themselves to readability when performing even moderately-complex tasks. If the algorithm is complex, I still like to see the occasional helpful comment. Please, therefore, be as liberal as you see fit in the detail of the comments you apply to this editorial, for like code it is bound to increase its' clarity and usefulness. Cheers, Tony.

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  • NoSQL is not about object databases

    - by Bertrand Le Roy
    NoSQL as a movement is an interesting beast. I kinda like that it’s negatively defined (I happen to belong myself to at least one other such a-community). It’s not in its roots about proposing one specific new silver bullet to kill an old problem. it’s about challenging the consensus. Actually, blindly and systematically replacing relational databases with object databases would just replace one set of issues with another. No, the point is to recognize that relational databases are not a universal answer -although they have been used as one for so long- and recognize instead that there’s a whole spectrum of data storage solutions out there. Why is it so hard to recognize, by the way? You are already using some of those other data storage solutions every day. Let me cite a few: The file system Active Directory XML / JSON documents The Web e-mail Logs Excel files EXIF blobs in your photos Relational databases And yes, object databases It’s just a fact of modern life. Notice by the way that most of the data that you use every day is unstructured and thus mostly unsuitable for relational storage. It really is more a matter of recognizing it: you are already doing NoSQL. So what happens when for any reason you need to simultaneously query two or more of these heterogeneous data stores? Well, you build an index of sorts combining them, and that’s what you query instead. Of course, there’s not much distance to travel from that to realizing that querying is better done when completely separated from storage. So why am I writing about this today? Well, that’s something I’ve been giving lots of thought, on and off, over the last ten years. When I built my first CMS all that time ago, one of the main problems my customers were facing was to manage and make sense of the mountain of unstructured data that was constituting most of their business. The central entity of that system was the file system because we were dealing with lots of Word documents, PDFs, OCR’d articles, photos and static web pages. We could have stored all that in SQL Server. It would have worked. Ew. I’m so glad we didn’t. Today, I’m working on Orchard (another CMS ;). It’s a pretty young project but already one of the questions we get the most is how to integrate existing data. One of the ideas I’ll be trying hard to sell to the rest of the team in the next few months is to completely split the querying from the storage. Not only does this provide great opportunities for performance optimizations, it gives you homogeneous access to heterogeneous and existing data sources. For free.

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  • mysql completely removing

    - by Dmitry Teplyakov
    I broke my mysql and now I want to completely reinstall it. I tried: $ sudo apt-get install --reinstall mysql-server $ sudo apt-get remove --purge mysql-client mysql-server But always I see popup with proposal to change root password, I change it and got an error that I can change it.. $ sudo apt-get remove --purge mysql-client mysql-server Reading package lists... Done Building dependency tree Reading state information... Done Package mysql-client is not installed, so not removed Package mysql-server is not installed, so not removed The following packages were automatically installed and are no longer required: libmygpo-qt1 libqtscript4-network libqtscript4-gui libtag-extras1 libqtscript4-sql libqtscript4-xml amarok-utils amarok-common libqtscript4-uitools liblastfm0 libloudmouth1-0 libqtscript4-core Use 'apt-get autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 1 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Setting up mysql-server-5.5 (5.5.28-0ubuntu0.12.04.2) ... 121114 19:04:03 [Note] Plugin 'FEDERATED' is disabled. 121114 19:04:03 InnoDB: The InnoDB memory heap is disabled 121114 19:04:03 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121114 19:04:03 InnoDB: Compressed tables use zlib 1.2.3.4 121114 19:04:03 InnoDB: Initializing buffer pool, size = 128.0M 121114 19:04:03 InnoDB: Completed initialization of buffer pool InnoDB: Error: auto-extending data file ./ibdata1 is of a different size InnoDB: 0 pages (rounded down to MB) than specified in the .cnf file: InnoDB: initial 640 pages, max 0 (relevant if non-zero) pages! 121114 19:04:03 InnoDB: Could not open or create data files. 121114 19:04:03 InnoDB: If you tried to add new data files, and it failed here, 121114 19:04:03 InnoDB: you should now edit innodb_data_file_path in my.cnf back 121114 19:04:03 InnoDB: to what it was, and remove the new ibdata files InnoDB created 121114 19:04:03 InnoDB: in this failed attempt. InnoDB only wrote those files full of 121114 19:04:03 InnoDB: zeros, but did not yet use them in any way. But be careful: do not 121114 19:04:03 InnoDB: remove old data files which contain your precious data! 121114 19:04:03 [ERROR] Plugin 'InnoDB' init function returned error. 121114 19:04:03 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 121114 19:04:03 [ERROR] Unknown/unsupported storage engine: InnoDB 121114 19:04:03 [ERROR] Aborting 121114 19:04:03 [Note] /usr/sbin/mysqld: Shutdown complete start: Job failed to start invoke-rc.d: initscript mysql, action "start" failed. dpkg: error processing mysql-server-5.5 (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: mysql-server-5.5 E: Sub-process /usr/bin/dpkg returned an error code (1) It is good for me that I have not any important databases, but..

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  • What micro web-framework has the lowest overhead but includes templating

    - by Simon Martin
    I want to rewrite a simple small (10 page) website and besides a contact form it could be written in pure html. It is currently built with classic asp and Dreamweaver templates. The reason I'm not simply writing 10 html pages is that I want to keep the layout all in 1 place so would need either includes or a masterpage. I don't want to use Dreamweaver templates, or batch processing (like org-mode) because I want to be able to edit using notepad (or Visual Studio) because occasionally I might need to edit a file on the server (Go Daddy's IIS admin interface will let me edit text). I don't want to use ASP.NET MVC or WebForms (which I use in my day job) because I don't need all the overhead they bring with them when essentially I'm serving up 9 static files, 1 contact form and 1 list of clubs (that I aim to use jQuery to filter). The shared hosting package I have on Go Daddy seems to take a long time to spin up when serving aspx files. Currently the clubs page is driven from an MS SQL database that I try to keep up to date by manually checking the dojo locator on the main HQ pages and editing the entries myself, this is again way over the top. I aim to get a text file with the club details (probably in JSON or xml format) and use that as the source for the clubs page. There will need to be a bit of programming for this as the HQ site is unable to provide an extract / feed so something will have to scrape the site periodically to update my clubs persistence file. I'd like that to be automated - but I'm happy to have that triggered on a visit to the clubs page so I don't need to worry about scheduling a job. I would probably have a separate process that updates the persistence that has nothing to do with the rest of the site. Ideally I'd like to use Mercurial (or git) to publish, I know Bitbucket (and github) both serve static page sites so they wouldn't work in this scenario (dynamic pages and a contact form) but that's the model I'd like to use if there is such a thing. My requirements are: Simple templating system, 1 place to define header, footers, menu etc., that can be edited using just notepad. Very minimal / lightweight framework. I don't need a monster for 10 pages Must run either on IIS7 (shared Go Daddy Windows hosting) or other free host

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  • Introducing Glimpse – Firebug for your server

    - by Neil Davidson
    Here at Red Gate, we spend every waking hour trying to wow .NET and SQL developers with great products.  Every so often, though, we find something out in the wild which knocks our socks off by taking “ingeniously simple” to a whole new level.  That’s what a little community led by developers Nik Molnar and Anthony van der Hoorn has done with the open source tool Glimpse. Glimpse describes itself as ‘Firebug for the server.’  You drop the NuGet package into your ASP.NET project, and then — like magic* — your web pages will bare every detail of their execution.  Even by our high standards, it was trivial to get running: if you can use NuGet, you’re already there. You get all that lovely detail without changing any code. Our feelings go beyond respect for the developers who designed and wrote Glimpse; we’re thrilled that Nik and Anthony have come to work for Red Gate full-time. They’re going to stay in control of the project and keep doing open source development work on Glimpse.  In the medium term, we’re hoping to make paid-for products which plug into the free open source framework, especially in areas like performance profiling where we already have some deep technology.  First, though, Glimpse needs to get from beta to a v1. Given the breakneck pace of new development, this should only be a month or so away. Supporting an open source project is a first for Red Gate, so we’re going to be working with Nik and Anthony, with the Glimpse community and even with other vendors to figure out what ‘great’ looks like from the a user perspective.  Only one thing is certain: this technology deserves a wider audience than the 40,000 people who have already downloaded it, so please have a look and tell us what you think. You can hear more about what the Glimpse developers think on the Glimpse blog, and there are plenty more technical facts over at our product manager’s blog. If you have any questions or queries, please tweet with the #glimpse hashtag or contact the Glimpse team directly on [email protected]. [*That’s ”magic” in the Arthur C. Clarke “sufficiently advanced technology” sense, of course] Neil Davidson co-founder and Joint CEO Red Gate Software http://twitter.com/neildavidson    

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  • Certificate Revocation checking affecting system performance [migrated]

    - by Colm Clarke
    I have a .NET 3.5 desktop application that had been showing periodic slow downs in functionality whenever the test machine it was on was out of the office. I managed to replicate the error on a machine in the office without an internet connection, but it was only when i used ANTS performance profiler that i got a clearer picture of what was going on. In ANTS I saw a "Waiting for synchronization" taking up to 16 seconds that corresponded to the delay I could see in the application when NHibernate tried to load the System.Data.SqlServerCE.dll assembly. If I tried the action again immediately it would work with no delay but if I left it for 5 minutes then it would be slow to load again the next time I tried it. From my research so far it appears to be because the SqlServerCE dll is signed and so the system is trying to connect to get the certificate revocation lists and timing out. Disabling the "Automatically detect settings" setting in the Internet Options LAN settings makes the problem go away, as does disabling the "Check for publishers certificate revocation". But the admins where this application will be deployed are not going to be happy with the idea of disabling certificate checking on a per machine or per user basis so I really need to get the application level disabling of the CRL check working. There is the well documented bug in .net 2.0 which describes this behaviour, and offers a possible fix with a config file element. <?xml version="1.0" encoding="utf-8"?> <configuration> <runtime> <generatePublisherEvidence enabled="false"/> </runtime> </configuration> This is NOT working for me however even though I am using .net 3.5. The SQLServerCE dll is being loaded dynamically by NHibernate and I wonder if the fact that it's dynamic could somehow be why the setting isn't working, but I don't know how I could check that. Can anyone offer suggestions as to why the config setting might not work? Or is there another way I could disable the check at the application level, perhaps a CAS policy setting that I can use to set an exception for the application when it's installed? Or is there something I can change in the application to up the trust level or something like that? I have also tried using to no advantage ServicePointManager.CheckCertificateRevocationList = false; http://rusanu.com/2009/07/24/fix-slow-application-startup-due-to-code-sign-validation/ I have also tried those registry settings out and unfortunately they didn't help. The dlls that appear to be the cause of the hold up are native SQL Server CE dlls, and looking at the stack traces in ProcMon mscorwks.dll doesn't appear to be involved even though the checks on crypto and cert registry keys are being done under the .NET application. It's definitely still something to do with publisher certificate checking because unticking "Check for publisher revocation certificate" still works but something odd is going on.

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  • Just another web startup - platform comparison

    - by Holland
    I'm looking to do a web startup which involves something along the lines of an ecommerce site, yet a little more in depth than that. While it's something that I would rather not go into detail with in terms of the initial idea, I can specify (on a basic level) what would be required of the website. If you have any observations or opinions derived from personal experience, which relate to what you see here, I'd appreciate it if you could share these. Paypal's API interaction (definitely). From what I've read about their API, integration with it into their website is VERY expensive, so I'd probably hold off on that until I've (hopefully) generated money and write my own simple credit-card interaction system. SQL Backend (obviously) PostgreSQL seems like a pretty good choice, as from what I've read, it's structure is a bit more "object-oriented" than, say, MySQL. Then again, I've used MySQL before and haven't had much problem with it whatsoever. Would it be worth learning PostgreSQL for this purpose? Java or .Net implementation (Preferably Mono, so I can use .Net while hosting the website using Apache). The reason for this is because, frankly, while I know PHP is a great platform to develop websites with, I hate developing with it. Before someone chimes in and flames me for saying that, note that I have nothing against the language, I just don't like it for my purposes. While Mono may be good to go with, I'm aware that ASP.Net MVC 3 hasn't been released for Mono yet, which may be a pain to work with, without their Razor syntax. Ontop of that, it seems Java is completely FULL of class libraries which deal with web development, that can be downloaded from the web. If anyone has any experience with these, I'd appreciate if that were posted. From what I've read about Spring and Struts2, they seem to be the best out there - especially since they're (AFAIK) MVC. I've considered Python and Django, which do seem REALLY nice, but I don't know much Python, and I'd rather start with something that I already know (language-wise; not framework-wise) than dive into learning a language AND a new framework. I'd REALLY like to be able to host my website via Apache, rather than using Windows Server or anything like that, as, frankly, I hate their setup. I'm not dissing it in any way, shape, or form, I'm just saying I dislike it. <3 terminal config. If there is a good reason to with Windows Server, however, I'd be willing to learn it. C# has a lot of things that Java appears not to have, including Delegates, unsigned types, and LINQ. Is there anything that Java has which can counter these?

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  • Mini Book Review of IronRuby Unleashed by Shay Friedman

    - by Eric Nelson
    When I get some time (and hell starts to look a little chilly) I would love to do a more detailed review. But I wanted to get something “out there” as I really like this book and reviews of it seem a little thin on the ground. In brief: Is it a good book? Yes Would I recommend this book to a .NET developer who was new to Ruby? Yes (This is me by the way) Would I recommend this book to a Ruby developer who was new to .NET ? Yes Would I recommend this book to a developer who sometimes does Ruby and sometimes does .NET? Yes Would I recommend this book to a developer new to .NET and new to Ruby? Yes The above demonstrates how well balanced this book is (IMHO). What I like about it: Its assumes pretty much no knowledge of IronRuby or .NET. All it asks is that you are a developer interested in IronRuby. Yet it manages to cover off the topics in a good degree of detail. If you are a Ruby developer you skip Part 2, if you are a .NET developer you skip some of Part 1 and whizz through the short intros to the individual technologies such as WPF. It is definitely not a “lets makes the manual look pretty” book – this is original content thoughtfully written and presented. It is pretty comprehensive – in 500 pages it packs in  Intro to IronRuby Intro to .NET Intro to Ruby Using IronRuby with Windows Forms, ASP.NET, WPF, Silverlight etc Getting Rails working with IronRuby Unit testing with IronRuby – which I think is an excellent way for a .NET developer to start using IronRuby Embedding IronRuby in a .NET app  - another interesting “first step” for a .NET developer What I didn’t like: Err… nothing yet. Ok, If I am being picky then the start of chapter 2 irked me a little as it went through the history of .NET. “The first version [of the .NET Framework] wasn’t that great”.  Felt pretty good to me compared to Java and C++ development at the time :-) Buy on Amazon UK | Buy on Amazon USA Related Links: Posts from the author Shay Friedman on IronRuby Guest Post: What's IronRuby, and how do I put it on Rails? Guest Post: Using IronRuby and .NET to produce the ‘Hello World of WPF’ Getting PhP and Ruby working on Windows Azure and SQL Azure

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  • Achieving Zero Downtime Deployment

    - by MattW
    I am trying to achieve zero downtime deployments so I can deploy less during off hours and more during "slower" hours - or anytime, in theory. My current setup, somewhat simplified: Web Server A (.NET App) Web Server B (.NET App) Database Server (SQL Server) My current deployment process: "Stop" the sites on both Web Server A and B Upgrade the database schema for the version of the app being deployed Update Web Server A Update Web Server B Bring everything back online Current Problem This leads to a small amount of downtime each month - about 30 mins. I do this during off hours, so it isn't a huge problem - but it is something I'd like to get away from. Also - there is no way to really go 'back'. I don't generally make rollback DB scripts - only upgrade scripts. Leveraging The Load Balancer I'd love to be able to upgrade one Web Server at a time. Take Web Server A out of the load balancer, upgrade it, put it back online, then repeat for Web Server B. The problem is the database. Each version of my software will need to execute against a different version of the database - so I am sort of "stuck". Possible Solution A current solution I am considering is adopting the following rules: Never delete a database table. Never delete a database column. Never rename a database column. Never reorder a column. Every stored procedure must be versioned. Meaning - 'spFindAllThings' will become 'spFindAllThings_2' when it is edited. Then it becomes 'spFindAllThings_3' when edited again. Same rule applies to views. While, this seems a bit extreme - I think it solves the problem. Each version of the application will be hitting the DB in a non breaking way. The code expects certain results from the views/stored procedures - and this keeps that 'contract' valid. The problem is - it just seeps sloppy. I know I can clean up old stored procedures after the app is deployed for awhile, but it just feels dirty. Also - it depends on all of the developers following these rule, which will mostly happen, but I imagine someone will make a mistake. Finally - My Question Is this sloppy or hacky? Is anybody else doing it this way? How are other people solving this problem?

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  • Is the science of Computer Science dead?

    - by Veaviticus
    Question : Is the science and art of CS dead? By that I mean, the real requirements to think, plan and efficiently solve problems seems to be falling away from CS these days. The field seems to be lowering the entry-barrier so more people can 'program' without having to learn how to truly program. Background : I'm a recent graduate with a BS in Computer Science. I'm working a starting position at a decent sized company in the IT department. I mostly do .NET and other Microsoft technologies at my job, but before this I've done Java stuff through internships and the like. I personally am a C++ programmer for my own for-fun projects. In Depth : Through the work I've been doing, it seems to me that the intense disciplines of a real science don't exist in CS anymore. In the past, programmers had to solve problems efficiently in order for systems to be robust and quick. But now, with the prevailing technologies like .NET, Java and scripting languages, it seems like efficiency and robustness have been traded for ease of development. Most of the colleagues that I work with don't even have degrees in Computer Science. Most graduated with Electrical Engineering degrees, a few with Software Engineering, even some who came from tech schools without a 4 year program. Yet they get by just fine without having the technical background of CS, without having studied theories and algorithms, without having any regard for making an elegant solution (they just go for the easiest, cheapest solution). The company pushes us to use Microsoft technologies, which take all the real thought out of the matter and replace it with libraries and tools that can auto-build your project for you half the time. I'm not trying to hate on the languages, I understand that they serve a purpose and do it well, but when your employees don't know how a hash-table works, and use the wrong sorting methods, or run SQL commands that are horribly inefficient (but get the job done in an acceptable time), it feels like more effort is being put into developing technologies that coddle new 'programmers' rather than actually teaching people how to do things right. I am interested in making efficient and, in my opinion, beautiful programs. If there is a better way to do it, I'd rather go back and refactor it than let it slide. But in the corporate world, they push me to complete tasks quickly rather than elegantly. And that really bugs me. Is this what I'm going to be looking forward to the rest of my life? Are there still positions out there for people who love the science and art of CS rather than just the paycheck? And on the same note, here's a good read if you haven't seen it before The Perils Of Java Schools

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  • SBUG Session: The Enterprise Cache

    - by EltonStoneman
    [Source: http://geekswithblogs.net/EltonStoneman] I did a session on "The Enterprise Cache" at the UK SOA/BPM User Group yesterday which generated some useful discussion. The proposal was for a dedicated caching layer which all app servers and service providers can hook into, sharing resources and common data. The architecture might end up like this: I'll update this post with a link to the slide deck once it's available. The next session will have Udi Dahan walking through nServiceBus, register on EventBrite if you want to come along. Synopsis Looked at the benefits and drawbacks of app-centric isolated caches, compared to an enterprise-wide shared cache running on dedicated nodes; Suggested issues and risks around caching including staleness of data, resource usage, performance and testing; Walked through a generic service cache implemented as a WCF behaviour – suitable for IIS- or BizTalk-hosted services - which I'll be releasing on CodePlex shortly; Listed common options for cache providers and their offerings. Discussion Cache usage. Different value propositions for utilising the cache: improved performance, isolation from underlying systems (e.g. service output caching can have a TTL large enough to cover downtime), reduced resource impact – CPU, memory, SQL and cost (e.g. caching results of paid-for services). Dedicated cache nodes. Preferred over in-host caching provided latency is acceptable. Depending on cache provider, can offer easy scalability and global replication so cache clients always use local nodes. Restriction of AppFabric Caching to Windows Server 2008 not viewed as a concern. Security. Limited security model in most cache providers. Options for securing cache content suggested as custom implementations. Obfuscating keys and serialized values may mean additional security is not needed. Depending on security requirements and architecture, can ensure cache servers only accessible to cache clients via IPsec. Staleness. Generally thought to be an overrated problem. Thinking in line with eventual consistency, that serving up stale data may not be a significant issue. Good technical arguments support this, although I suspect business users will be harder to persuade. Providers. Positive feedback for AppFabric Caching – speed, configurability and richness of the distributed model making it a good enterprise choice. .NET port of memcached well thought of for performance but lack of replication makes it less suitable for these shared scenarios. Replicated fork – repcached – untried and less active than memcached. NCache also well thought of, but Express version too limited for enterprise scenarios, and commercial versions look costly compared to AppFabric.

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  • Real-time Big Data Analytics is a reality for StubHub with Oracle Advanced Analytics

    - by Mark Hornick
    What can you use for a comprehensive platform for real-time analytics? How can you process big data volumes for near-real-time recommendations and dramatically reduce fraud? Learn in this video what Stubhub achieved with Oracle R Enterprise from the Oracle Advanced Analytics option to Oracle Database, and read more on their story here. Advanced analytics solutions that impact the bottom line of a business are challenging due to the range of skills and individuals involved in realizing such solutions. While we hear a lot about the role of the data scientist, that role is but one piece of the puzzle. Advanced analytics solutions also have an operationalization aspect that also requires close proximity to where the transactional activity occurs. The data scientist needs access to the right data with which to model the business problem. This involves IT for data collection, management, and administration, as well as ensuring zero downtime (a website needs to be up 24x7). This also involves working with the data scientist to keep predictive models refreshed with the latest scripts. Integrating advanced analytics solutions into enterprise apps involves not just generating predictions, but supporting the whole life-cycle from data collection, to model building, model assessment, and then outcome assessment and feedback to the model building process again. Application and web interface designers need to take into account how end users will see and use the advanced analytics results, e.g., supporting operations staff that need to handle the potentially fraudulent transactions. As just described, advanced analytics projects can be "complicated" from just a human perspective. The extent to which software can simplify the interactions among users and systems will increase the likelihood of project success. The ability to quickly operationalize advanced analytics projects and demonstrate measurable value, means the difference between a successful project and just a nice research report. By standardizing on Oracle Database and SQL invocation of R, along with in-database modeling as found in Oracle Advanced Analytics, expedient model deployment and zero downtime for refreshing models becomes a reality. Meanwhile, data scientists are also able to explore leading edge techniques available in open source. The Oracle solution propels the entire organization forward to realize the value of advanced analytics.

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  • Newbie worried about CASE tool.

    - by Jason Evans
    Hi there. I'm looking for some guidance on CASE tools and whether my concerns are valid. Recently I was in a meeting between my employer and an external software company which have a CASE tool currently in beta. They demonstrated this tool to us, showing how you build a UML model in Enterprise Architect (or something like it) and then, through their tool, that UML model is transformed into a Visual Studio project, with C# files, stored procedures for SQL Server, code for the data layer, WCF stuff, logging code and allsorts. Now, admittedly, I don't see the point in this, as in I'm not convinced it will save that much time (plus it feels like overkill). The tool authors said that a trial of the tool at another company had saved a team there 5 weeks of development time (from 6 weeks down to about 1 week) using this tool. I find the accuracy of that estimate hard to believe. My main concern is whether using this tool is going slow down my productivity. For example - Say I have a UML model which I built a VS solution from. Now, I want to rename a class method to something else; will this mean having to update the UML model first and then rebuilding the code? Is this how case tools normally work? Something I will need to check with the authors is the structure of the generated VS solution. I like the Domain Driven Design way of project structure - Infrstructure, Services, Model, etc. I doubt very much this tool will do that. Also, I've been playing around with Entity Framework Code First and think it's a great way to build the data model. I have nice repositories, unit of work classes and other design patterns that work well with EF. I have data anootations and stuff like that working great. By not having EF (the CASE tool uses it's own data layer code) I'm concerned that this tool's data layer code might not be a nice to integrate in the UoW pattern, repositories, etc. This I will need to verify when I get a closer look at the generated code. What are other people's experiences with CASE tools? Am I being paranoid about nothing? Am I being unfair - are my negativities unfounded? EDIT: I like to use TDD/BDD for building my code, and using a CASE tool looks like it will make this difficult. Again, any feedback on this would be great. Cheers. Jas.

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  • Oracle ODP.NET und Windows PowerShell

    - by cjandaus
    In der Microsoft Welt wohlbekannt, in der Oracle Welt nur ein Schulterzucken hervorrufend - die sogenannten Scripting Guys. Wie der Name bereits vermuten lässt, geht es in deren Hey, Scripting Guy! Blog um Scripting. Und damit natürlich um die Windows PowerShell. Ja, die Zeiten des DOS-Kommandofensters und Batch-Dateien ist vorbei. Die PowerShell ist eine mächtige Scripting-Umgebung unter Windows, die selbst unter Unix/Linux-Administratoren Gefallen finden sollte. Dass man damit wunderbar auch auf Oracle Datenbanken zugreifen kann, haben wir bereits vor Jahren in einer Oracle Workshop Reihe bewiesen. Damals begleitete mich Klaus Rohe von Microsoft, der mit mir dann auch gemeinsam einen Vortrag auf DOAG Konferenz hielt. Unser gemeinsames Ziel war es damals wie heute, die Oracle Anwender von der hervorragenden Integration zwischen Oracle, Windows und .NET zu überzeugen. Was lag näher, als sich dies von beiden Herstellern gemeinsam bestätigen zu lassen? Vor allem die ewigen Zweifler begrüßten dies. Seither war die PowerShell bei mir nicht mehr auf dem Radar und auch Oracle Anwender haben das Thema nicht mehr aufgeworfen. Möglicherweise auch deshalb, weil es zu neu oder zu unbekannt ist? Eher unwahrscheinlich ... Vielleicht liegt es vielmehr daran, dass man einfach mal davon ausgeht, dass PowerShell nur für Microsoft Produkte richtig nutzbar ist? Oder man bekommt erzählt, dass nur die Integration mit der Microsoft-eigenen Datenbank SQL Server möglich ist? Und das ist natürlich nicht richtig - so wie immer (ich denke dabei unter anderem an das Microsoft Active Directory - aber dazu ein andermal mehr). Umso mehr freut es mich, einen brandneuen Blog-Beitrag zu genau diesem Thema zu lesen, auf den mich Alex Keh, (Produkt Manager für Windows und .NET im Oracle Headquarter in San Francisco) aufmerksam gemacht hat. Was die Sache noch besser macht, dieser Beitrag stammt aus der Microsoft Welt und belegt damit zwischen den Zeilen, dass die Oracle Datenbank und unsere .NET Integration via dem Oracle Data Provider for .NET (ODP.NET) auch hier eine bedeutende Rolle spielt. In diesem Sinne: Beide Daumen hoch für die Scripting Guys! Der Beitrag nennt sich Use Oracle ODP.NET and PowerShell to Simplify Data Access und trotz ein paar weniger Ausreißer, ist der Artikel sehr zu empfehlen, um in das Thema einzusteigen. Lassen Sie es mich wissen, wie Sie zu dieser Integration stehen, ob die PowerShell für Sie in der Praxis wichtig ist oder werden könnte, und falls Sie Features vermissen, die Oracle künftig umsetzen sollte. Danke!

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  • links for 2011-03-08

    - by Bob Rhubart
    The Empowered Business "Someone needs to be the enterprise parent that asks the question, “do you really need that?” It may be a shiny new thing, but does it make a difference in the ability to accomplish the strategy and goals?" - Enterprise Architect Todd Biske (tags: enterprisearchitecture) Knowledge Workers in the British Raj "While we’ve used technology to change business, business has also evolved to the point that it’s changing how we think about and use technology." - Peter Evans Greenwood (tags: enterprisearchitecture enterprise2.0) Arun Gupta, Miles to go ...: OTN Developer Day Boston 2011 - Slides & Trip Report Arun Gupta shares slides from his Developer Day presentations. (tags: oracle otn java) Use WLST to Delete All JMS Messages From a Destination (James Bayer's Blog) James Bayer responds to a question. (tags: oracle otn weblogic jms) Triangle Circle Square: Apex in the Amazon Cloud Scott Wesley shares several links to resources covering Oracle Apex on an Amazon EC2 instance. (tags: oracle apex ec2 amazon cloud) William Vambenepe: Reading IBM's proposed standard for Cloud Architecture The always entertaining William Vambenepe gives IBM's proposed Cloud standards the full Ebert. (tags: oracle cloud ibm standards) Government Information Group Cloud Computing Research Study "The twin pressures of reduced budgets and the need for greater efficiency have led the federal government to strongly promote cloud computing as a solution whenever possible." (tags: cloudcomputing cloud) The Ron Batra Blog: Technology Whispers: Top 10 Reasons to go ExaData "Continuing my exploration of ExaData, I thought I'd take a minute to consolidate my thoughts into key reasons for which Oracle ExaData could be a good fit for your needs." - Oracle ACE Director Ron Batra (tags: oracle oracleace exadata) Oracle WebCenter: Composite Applications & Mash-Ups (Oracle Enterprise 2.0 Blog) "The new Business Mash-up editor allows business users to take any Oracle Application or 3rd party application and wire the backend data sources or APIs to a rich set of visualizations and reuse them in mashups." (tags: oracle webcenter enterprise2.0) Antonio Romero: Great Discussion of ETL and ELT Tooling in TDWI Linkedin Group Antonio says: "There’s a great discussion of ETL and ELT tooling going on in the official TDWI Linkedin group, under the heading 'How Sustainable is SQL for ETL?' It delves into a wide range of topics." (tags: oracle linkedin etl elt) YouTube - Bunny Inc. - Episode 1. Mr. CIO meets Mr. Executive Manager Yes, it's a commercial. But it's well done and it's funny. (tags: e20 enterprise2.0 webcenter) Markus Eisele: Both Weblogic and Glassfish are strategic products for Oracle Oracle ACE Director Markus Eisele shares selected quotes pulled from the recent TechCast Live interview with Oracle's Anil Gaur and Adam Leftik (tags: oracle java weblogic glassfish) How to become an Oracle SOA expert? (SOA Partner Community Blog) Jurgan Kress shares info and links for those interested in capitalizing on SOA. (tags: oracle soa)

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  • First Ever MySQL on Windows Online Forum - March 16, 2011

    - by monica.kumar
    72 1024x768 Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Cambria","serif";} Now you might be thinking…what’s an Online Forum? Well, think of it as a virtual conference, where you can attend a series of presentations about a given topic, from the comfort of your own office/home. On Wednesday March 16th, from 9.00 am PT to 12.00, we will be running the first ever MySQL Online Forum, dedicated to MySQL on Windows. Register now to learn how you can reduce your database TCO on Windows by up to 90% while increasing manageability & flexibility!   Oracle’s MySQL Vice President of Engineering Tomas Ulin will kick off a comprehensive agenda of presentations enabling you to better understand:   How you can save up to 90% by using MySQL on WindowsWhy the world’s most popular open source database is extremely popular on Windows, both for enterprise users and for embedding by ISVs How MySQL is a great fit for the Windows environment, and what are the upcoming milestones to make MySQL even better on the Microsoft platform What are the visual tools at your disposal to effectively develop, deploy and manage MySQL applications on Windows How you can deliver highly available business critical Windows based MySQL applications Why Security Solutions Provider SonicWall selected MySQL over Microsoft SQL Server, and how they successfully deliver MySQL based solutions Plus, as we’ll have Live Chat On during the entire forum, you’ll be able to ask questions at any time to MySQL experts online. Register Now!   Whether you’re an ISV or an enterprise user, either already running MySQL on Windows or simply considering it, join us and learn how you can get performance, lower TCO and increased manageability & flexibility with MySQL on Windows!

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  • K2 4.5 Quick Thoughts

    I just finished attending a webcast on K2 4.5 and I thought Id share a few quick thoughts. Power User Story Improved Given it is just a presentation and I havent actually played with it, the story seemed improved and more believable that real world power users would be able to define workflows in SharePoint.  Power users who would be comfortable with Excel functions may be able to do some more worthwhile workflows since there is new support for inline functions and conditions.  The new SilverLight K2 designer seems pretty user friendly, though the dialog windows can really stack up which may get confusing.  I thought the neatest part was that the workflow can be defined just by starting with a SharePoint Lists settings which may be okay for some organizations and simpler workflows that dont need to define the workflow and push it through lots of testing in different environments.  The standalone K2 Studio is back.  In K2 2003 it was required because Visual Studio integration didnt exist.  Its back now for use by power users who need functionality up to the point of code.  Not sure if this Administration/Installation Installation is supposed to be simplified, with unattended install and other details I didnt catch.  Install and configuration has always seemed daunting to me so anything to improve that is good.  Related to that there is a new tool that is meant to help diagnose issues in your installation.  That may include figuring out missing permissions or services that arent running.  Also, now all K2 SharePoint features deployed as solutions. Dynamic SQL Service Broker Create a smart object to go against a table that you created, NOT the SmartBox.  This seems promising and something that maybe should have been there all along. Reference Event Allows you to call functionally that youve referenced, in the sample showing it was calling a web service that was referenced.  It seemed odd because it was really like writing code using dialogs (call constructor, set timeout, call web service method).  Seemed a little odd to me. Help We were reminded that help.k2.com site is newish site that is supposed to be the MSDN of K2 for partners and customers. VS 2010 Support Still no hard date on this, but what we were told is approximately 90 days after VS 2010 is officially released.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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  • How does I/O work for large graph databases?

    - by tjb1982
    I should preface this by saying that I'm mostly a front end web developer, trained as a musician, but over the past few years I've been getting more and more into computer science. So one idea I have as a fun toy project to learn about data structures and C programming was to design and implement my own very simple database that would manage an adjacency list of posts. I don't want SQL (maybe I'll do my own query language? I'm just having fun). It should support ACID. It should be capable of storing 1TB let's say. So with that, I was trying to think of how a database even stores data, without regard to data structures necessarily. I'm working on linux, and I've read that in that world "everything is a file," including hardware (like /dev/*), so I think that that obviously has to apply to a database, too, and it clearly does--whether it's MySQL or PostgreSQL or Neo4j, the database itself is a collection of files you can see in the filesystem. That said, there would come a point in scale where loading the entire database into primary memory just wouldn't work, so it doesn't make sense to design it with that mindset (I assume). However, reading from secondary memory would be much slower and regardless some portion of the database has to be in primary memory in order for you to be able to do anything with it. I read this post: Why use a database instead of just saving your data to disk? And I found it difficult to understand how other databases, like SQLite or Neo4j, read and write from secondary memory and are still very fast (faster, it would seem, than simply writing files to the filesystem as the above question suggests). It seems the key is indexing. But even indexes need to be stored in secondary memory. They are inherently smaller than the database itself, but indexes in a very large database might be prohibitively large, too. So my question is how is I/O generally done with large databases like the one I described above that would be at least 1TB storing a big adjacency list? If indexing is more or less the answer, how exactly does indexing work--what data structures should be involved?

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  • Importing PKCS#12 (.p12) files into Firefox From the Command Line

    - by user11165
    I’ve posted this question up on #Ubuntu and #Firefox Forums, and really could do with some help.. Anyone know where i could look or help with the answer. I’m hoping the power of social media will come through… I have a need to perform the following action: Firefox 3.6.x: Quote: open Edit - Preferences - Advanced - Encryption - View Certificates - Your Certificates - Import However i need the same functionality from the bash command line. So far I’ve established that the following command is supposed to be used: Quote: certutil -A -t “u,u,u” -d /home/df001/.mozilla/firefox/qe5y5lht.tc.default/ -n “mycert” -i client.p12 This executes with no isses, however, doesn’t show up in any Firefox Certificate store. However, I have noted that prior to running this command, i have a cert8.db key3.db and secmod.db file in the above folder. After running the command the certutil seems to have created a cert9.db, key4.db and pkcs12.txt file Listing the contents using the command: Quote: certutil -L -d sql:/home/df001/.mozilla/firefox/qe5y5lht.tc.default/ does seem to confirm my attempts of importing files into a certificate folder of some kind have worked. because i get Quote: Certificate Nickname Trust Attributes SSL,S/MIME,JAR/XPI Thawte SSL CA „ Go Daddy Secure Certification Authority „ Thawte SGC CA „ Entrust Certification Authority - L1C „ My Nero CT,C,c mynero P„ davidfield - Internet Widgits Pty Ltd u,u,u So, having tried this, and heading back over to the www, i cam across this command: Quote: pk12util -d /home/df001/.mozilla/firefox/qe5y5lht.tc.default/ -i client.p12 -n “David Field” -P “cert8.db” this again, appears to be importing something somewhere, however, again, Viewing certs from the Firefox interface doesn’t show the imported Cert. I’m surmising here on reading that the certutil and pk12util are creating a new NSS database, which firefox isn’t reading. So my question is, how can i get the p12 cert from the command line so it displays in the firefox Certificate manager interface? Why have i posted this here? Why not post on the firefox forum? Well i will copy and post the same question there as well, however the ability to use the command line to do this is important, as I have potentially 2000 machines which will need a user cert imported into firefox via a p12 file. I need to do this in the form of a script, i thought the hard part was going to be making the p12 file from the microsoft 2003 CA, turns out thats easy. I can’t just import via the GUI and copy over cert8.db x 2000, i can’t ask users to use the CA webinterface as its for VPN access, the users are off site, and they need the VPN to get to the cert server.. Is there any person out there who can help? By the way, i don't have the tor buttun installed.

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  • Adding Attributes to Generated Classes

    ASP.NET MVC 2 adds support for data annotations, implemented via attributes on your model classes.  Depending on your design, you may be using an OR/M tool like Entity Framework or LINQ-to-SQL to generate your entity classes, and you may further be using these entities directly as your Model.  This is fairly common, and alleviates the need to do mapping between POCO domain objects and such entities (though there are certainly pros and cons to using such entities directly). As an example, the current version of the NerdDinner application (available on CodePlex at nerddinner.codeplex.com) uses Entity Framework for its model.  Thus, there is a NerdDinner.edmx file in the project, and a generated NerdDinner.Models.Dinner class.  Fortunately, these generated classes are marked as partial, so you can extend their behavior via your own partial class in a separate file.  However, if for instance the generated Dinner class has a property Title of type string, you cant then add your own Title of type string for the purpose of adding data annotations to it, like this: public partial class Dinner { [Required] public string Title { get;set; } } This will result in a compilation error, because the generated Dinner class already contains a definition of Title.  How then can we add attributes to this generated code?  Do we need to go into the T4 template and add a special case that says if were generated a Dinner class and it has a Title property, add this attribute?  Ick. MetadataType to the Rescue The MetadataType attribute can be used to define a type which contains attributes (metadata) for a given class.  It is applied to the class you want to add metadata to (Dinner), and it refers to a totally separate class to which youre free to add whatever methods and properties you like.  Using this attribute, our partial Dinner class might look like this: [MetadataType(typeof(Dinner_Validation))] public partial class Dinner {}   public class Dinner_Validation { [Required] public string Title { get; set; } } In this case the Dinner_Validation class is public, but if you were concerned about muddying your API with such classes, it could instead have been created as a private class within Dinner.  Having the validation attributes specified in their own class (with no other responsibilities) complies with the Single Responsibility Principle and makes it easy for you to test that the validation rules you expect are in place via these annotations/attributes. Thanks to Julie Lerman for her help with this.  Right after she showed me how to do this, I realized it was also already being done in the project I was working on. 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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  • Go for the Deep Dive on Oracle Products and Technology

    - by Oracle OpenWorld Blog Team
    by Karen Shamban Oracle University gives you more learning for your conference investment. It’s easier than ever before to get in-depth Oracle product and technology training if you’re attending any of the Oracle conferences this fall, including Oracle OpenWorld, the Oracle Customer Experience Summit @ OpenWorld, the Oracle PartnerNetwork Exchange @ OpenWorld, and MySQL Connect. Why is it easier? Because Oracle University preconference training takes place on Sunday, September 30 from 8:00 a.m. to 3:30 p.m. And you’re going to be in town for the conference anyway, right? The training ends early enough in the afternoon that you’ll still be able to get good seats for conference opening keynotes and get psyched for the welcome reception that follows. Each session will be taught by an expert Oracle University instructor and will be fact-packed with demos and tips to help you do more than ever before with your Oracle product and technology investment. The training sessions being offered include: Applications:·             PeopleSoft Test Framework Script Creation and Optimization·             New Integration Technologies for PeopleTools 8.52·             Oracle Fusion Applications: Security Fundamentals Database and Systems:·             Certification Exam Cram: Oracle Database 11g: New Features for Administrators·             Exadata Database Machine Administration Workshop·             Introduction to Big Data·             Using Oracle Enterprise Manager Cloud Control 12c·             Using Java - for PL/SQL and Database Developers Fusion Middleware:·             Developing Portable Java EE Applications with the Enterprise JavaBeans 3.1 API and Java Persistence API 2.0·             Developing Secure Java Web Services·             How The Latest Java EE and SOA Help in Architecting and Designing Robust Enterprise Applications·             Oracle Business Intelligence 11g: Overview to Analyses and Dashboards·             Oracle Fusion Middleware 11g: Build Applications with ADF I·             Oracle Fusion Middleware 11g Administer Forms Services·             Oracle SOA Suite 11g Administration·             WebLogic Server Administration Essentials Don’t miss this great opportunity to maximize your Oracle OpenWorld experience and investment. Learn more about Oracle University training sessions.

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