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  • Speaker at developer conferences and user group meetings

    Catching up on a couple of sessions I did in the past. This article gives an overview of some of my activities. Mainly at the annual German Visual FoxPro Developer Conference also known as SQL-Server & ASP.NET Conference in Frankfurt. The below listed entries are excerpts from the original Conference Coverage documents you'll find on UniversalThread. German Visual FoxPro Developer Conference 2002 (1 session - Vendor session about Active FoxPro Pages 3.0) German Visual FoxPro Developer Conference 2003 (2.5 sessions - Visual FoxPro running on Linux) German Visual FoxPro Developer Conference 2004 (4 sessions - 2x Active FoxPro Pages, VFP on Linux, and VFP using additional databases) German Visual FoxPro Developer Conference 2005 (4 sessions - RegEx, XML, XSLT, and using free (as in beer) development tools) German Visual FoxPro Developer Conference 2006 (3 sessions - .NET interop via COM, writing own CLR host in VFP, and Active FoxPro Pages) Furthermore, I did a couple of (hopefully) interesting sessions at various user group meetings in Speyer and Stuttgart. A more comprehensive list is available under Presentations (in German language). And last but not least, back in May 2005 Microsoft Germany invited me to host a WebCast for MSDN on how to use 'Visual FoxPro mit Visual Studio 2005'. Unfortunately, I was too unexperienced and too nervous (first time ever), we experienced technical issues with the microphone, and the obviously low quality of recording demanded to replace it by a whole series on Visual FoxPro 9.0. The webcast covered the same topics I already described in other articles here on my blog. Despite the desaster I'd like to thank Ralf Westphal for his kind words afterwards - I really felt bad. Eventually, you might ask yourself why it stopped by the end of 2006... Well, new chapter in my life: Mauritius!

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  • Geeks with Blogs acquired by Watson Technology Group

    - by Tarun Arora
    Just received the following email… It’s now official! Hello bloggers, you are receiving this email to let you know that Geeks with Blogs (http://geekswithblogs.net) has been acquired by my company, Watson Technology Group. Jeff Julian started the site in 2003 and since then him and John Alexander (AJI Software) have done a great job with the community. I am a long time friend of theirs and I was actually one of the first bloggers on the site in 2003. I am excited to take over the reins and I have a lot of plans to improve the blog platform and community. My goal is to make the site the #1 blogging site for all IT professionals. The site currently has over 3,000 bloggers and has received 75,000,000 website visitors over the last 5 years. Some of the planned improvements in the coming months: Overall look and feel upgrades to the site Improve editor for blog postings including support for code formatting and uploading images Mobile support and more responsive design templates Improve community side of the site to drive more traffic between blogs Highlight top articles and bloggers by redesigning the home page ... and lots of other things. One of the delicate balances I want to ensure is that each blogger can maintain their own identity and blog personality but at the same time be part of the community of bloggers. The community helps everyone receive more blog traffic and visibility. The blog templates need to be somewhere between Facebook and Myspace if you know what I mean. Since this website is designed to be a community, I would love to have your feedback and hear your ideas. Please submit idea via UserVoice at http://geekswithblogs.uservoice.com or email [email protected] at anytime. For those who are interested to know more about me, here is a link to my LinkedIn profile and you can follow me on Twitter @mattwatson81. LinkedIn: http://www.linkedin.com/in/mattwatsonkc Thanks, Matt Watson Geeks with Blogs Member of Geeks with Blogs Unsubscribe [email protected] from this list. Our mailing address is: GeeksWithBlogs,LLC 9201 Ward Parkway Suite 302 Kansas City, MO 64114

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  • West Palm Beach Dev Group August 2012 Meeting Recap

    - by Sam Abraham
    As the saying goes, it’s better late than never. Such is the case with my overdue West Palm Beach Dev Group August 2012 meeting report. Our August meeting was full of both knowledge and adventure. It comes as no surprise that the knowledge was brought to us by our favorite DotNetNuke Technical Evangelist, Will Strohl. Will introduced and thoroughly presented the new social features in DNN 6.2. Unfortunately, our meeting date coincided with Hurricane Isaac having just passed us by. Aside from road closures and floods that kept public schools closed for two days, our meeting host, PC Professor, had to close the school the day of our meeting on a short notice due to flooding which we found out about at midnight on the day of the event.  This left us scrambling to find an available alternate meeting location close enough to our original venue. Cancelling the meeting was always an option, but we opted to keep it as the very last resort. Luckily, we were fortunate to find a meeting room at the Hampton Inn only a few minutes away from our original location. Having heard of our challenge, our event sponsor, Applied Innovations, stepped-in and covered the meeting room cost in addition to the food and beverages. We would like to thank our volunteers and sponsors who made that event a success: Jess Coburn, CEO and Cara Pluff, Director of Sales at Applied Innovations, Dave Noderer for suggesting the alternate venue and Venkat Subramanian for his hard work keeping our members informed of the venue change and for being our event photographer.   We look forward to seeing you at our upcoming meetings: -September 25th, 2012 with Jonas Stawski, Microsoft MVP -October 23rd, 2012 with our Microsoft Developer Evangelist, Joe “DevFish” Healy -Ending an exciting year will be our November 27th meeting with Dycom Industries’ Senior Software Developer, Tom Huynh.   All the best, --Sam

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  • Frederick .NET User Group June 2010 Meeting

    - by John Blumenauer
    FredNUG is pleased to announce our June speaker will be Pete Brown.  Pete was one FredNUG’s first speakers when the group started and we’re very happy to have him visiting us again to present on Silverlight!  On June 15th @ 6:30 PM, we’ll start with a Visual Studio 2010 Launch with pizza, swag and a presentation about what makes Visual Studio 2010 great.  Then, starting at 7 PM, Pete Brown will present “What’s New in Silverlight 4.”  It looks like a evening filled with newness!   The scheduled agenda is:   6:30 PM - 7:15 PM – Visual Studio 2010 Launch Event plus Pizza/Social Networking/Announcements 7:15 PM - 8:30 PM - Main Topic: What’s New in Silverlight 4 with Pete Brown  Main Topic:  What’s New in Silverlight 4? Speaker Bio: Pete Brown is a Senior Program Manager with Microsoft on the developer community team led by Scott Hanselman, as well as a former Microsoft Silverlight MVP, INETA speaker, and RIA Architect for Applied Information Sciences, where he worked for over 13 years. Pete's focus at Microsoft is the community around client application development (WPF, Silverlight, Windows Phone, Surface, Windows Forms, C++, Native Windows API and more). From his first sprite graphics and custom character sets on the Commodore 64 to 3d modeling and design through to Silverlight, Surface, XNA, and WPF, Pete has always had a deep interest in programming, design, and user experience. His involvement in Silverlight goes back to the Silverlight 1.1 alpha application that he co-wrote and put into production in July 2007. Pete has been programming for fun since 1984, and professionally since 1992. In his spare time, Pete enjoys programming, blogging, designing and building his own woodworking projects and raising his two children with his wife in the suburbs of Maryland. Pete's site and blog is at 10rem.net, and you can follow him on Twitter at http://twitter.com/pete_brown Twitter: http://twitter.com/pete_brown Facebook: http://www.facebook.com/pmbrown Pete is a founding member of the CapArea .NET Silverlight SIG. (Visit the CapArea. NET Silverlight SIG here )    8:30 PM - 8:45 PM – RAFFLE! Please join us and get involved in our .NET developers community!

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  • Coherence Special Interest Group: First Meeting in Toronto and Upcoming Events in New York and Calif

    - by [email protected]
    The first meeting of the Toronto Coherence Special Interest Group (TOCSIG). Date: Friday, April 23, 2010 Time: 8:30am-12:00pm Where: Oracle Mississauga Office, Customer Visitation Center, 110 Matheson Blvd. West, Suite 100, Mississauga, ON L5R3P4 Cameron Purdy, Vice President of Development (Oracle), Patrick Peralta, Senior Software Engineer (Oracle), and Noah Arliss, Software Development Manager (Oracle) will be presenting. Further information about this event can be seen here   The New York Coherence SIG is hosting its seventh meeting. Date: Thursday, Apr 15, 2010 Time: 5:30pm-5:45pm ET social and 5:45pm-8:00pm ET presentations Where: Oracle Office, Room 30076, 520 Madison Avenue, 30th Floor, Patrick Peralta, Dr. Gene Gleyzer, and Craig Blitz from Oracle, will be presenting. Further information about this event can be seen here   The Bay Area Coherence SIG is hosting its fifth meeting. Date: Thursday, Apr 29, 2009 Time: 5:30pm-5:45pm PT social and 5:45pm-8:00pm PT presentations Where: Oracle Conference Center, 350 Oracle Parkway, Room 203, Redwood Shores, CA Tom Lubinski from SL Corp., Randy Stafford from the Oracle A-team, and Taylor Gautier from Grid Dynamics will be presenting Further information about this event can be seen here   Great news, aren't they? 

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  • New York Coherence Special Interest Group, Jan 13 2011

    - by ruma.sanyal
    Please join us for our next exciting event. We are pleased to announce that Aleksander Seovic, Craig Blitz and Madhav Sathe will be presenting to our group. Presentation details are provided below. Time: 3:00pm - 6:00pm ET Where: Oracle Office, Room 30076, 520 Madison Avenue, 30th Floor, NY We will be providing snacks and beverages. Register! - Registration is required for building security. Presentations:? Getting the Most out of your Coherence Cluster with Oracle Enterprise Manager - Madhav Sathe, Principal Product Manager (Oracle) How To Build a Coherence Practice - Craig Blitz, Senior Principal Product Manager (Oracle) Congratulations on your decision to buy Oracle Coherence. We believe you have chosen an excellent product. Now the hard work begins. To help you get the most out of Coherence from both a project and enterprise perspective, this talk will introduce you to resources available from Oracle and through the Coherence ecosystem. The talk will also discuss best organizational practices you can implement to ensure success with Coherence. The speaker will use his significant experience with customers' Coherence deployment to show what works and what doesn't in practice. Coherence in the Cloud - Aleksandar Seovic, Founder and Managing Director (S4HC) Amazon Web Services cloud provides great and affordable foundation for the next generation of scalable web applications. Application servers, load balancers, and scalable storage can be provisioned in a matter of minutes and used for pennies an hour. However, AWS cloud also brings a set of new architectural challenges, such as transient file systems and dynamically assigned IP addresses. In this session we will look at a real-world example of how Coherence can be used to address some of these challenges and show why the combination of AWS cloud and Coherence has a great synergy.

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  • Kent .Net/SqlServer User Group – Upcoming events

    - by Dave Ballantyne
    At the Kent user group we have two upcoming events.  Both are to be held at F-Keys Training suite http://f-keys.co.uk/ in Rochester, Kent. If you haven’t attended before please note the location here. 14-June Is your code S.O.L.I.D ? Nathan Gloyn Everybody keeps on about SOLID principles but what are they? and why should you care? This session is an introduction to SOLID and I'll aim to walk through each principle telling you about that principle and then show how a code base can be refactored using the principles to make your life easier, Come the end of the session you should have a basic understanding of the principle, why to use it and how using it can improve your code. Building composite applications with OpenRasta 3 Sebastien Lambla A wave of change is coming to Web development on .NET. Packaging technologies are bringing dependency management to .NET for the first time, streamlining development workflow and creating new possibilities for deployment and administration. The sky's the limit, and in this session we'll explore how open frameworks can help us leverage composition for the web. Register here for this event http://www.eventbrite.com/event/1643797643 05-July Tony Rogerson Achieving a throughput of 1.5Terabytes or over 92,000 8Kbyte of 100% random reads per second on kit costing less that 2.5K, and of course what to do with it! The session will focus on commodity kit and how it can be used within business to provide massive performance benefits at little cost. End to End Report Creation and Management using SQL Server Reporting Services  Chris Testa-O'NeillThis session will walk through the authoring, management and delivery of reports with a focus on the new features of Reporting Services 2008 R2. At the end of this session you will understand how to create a report in the new report designer. Be aware of the Report management options available and the delivery mechanisms that can be used to deliver reports. Register here for this event http://www.eventbrite.com/event/1643805667 Hope to see you at one or other ( or even both if you are that way inclined).

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  • Oracle Worldwide Product Translation Group and Applications User Experience Working Together

    - by ultan o'broin
    The Applications User Experience (UX) Mobile team has been extending its ethnographic research to even more countries. Recently, the team conducted research in Sweden, and I am pleased to say I made the connection for the UX team with the Oracle's Worldwide Translation Product Group (WPTG) local (that is, in-country) language specialists. It struck me that WPTG's local market knowledge and insight that we heard about at an Oracle Usability Advisory Board meeting in the UK in 2011 would be very valuable to the UX efforts while, at the same time, UX could afford WPTG an opportunity to understand our design and development direction so that linguistic resources (terminology, style guides, translatability guidelines, and so on) for any translation of our mobile solutions could be prepared in advance. Brent White of the Mobile UX team takes notes as ethnography participant Capri Norman uses mobile technology to work in Stockholm. Pic credit: Oracle Applications UX. The UX team acknowledges Capri's kind permission to use this image. I'm told by Brent White of the Mobile UX team that the co-operation was a big success.  A WPTG Swedish language specialist joined a couple of ethnographic sessions, taking great notes and turning them around very fast for the UX team. And of course, a great local insight into Swedish culture and ways of working was provided too, along with some nice socializing!  More research in more countries is planned. Watch out for future blog posts and other communications about this great co-operation worldwide.

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  • handling long running large transactions with perl dbi

    - by 1stdayonthejob
    I've got a large transaction comprising of getting lots of data from database A, do some manipulations with this data, then inserting the manipulated data into database B. I've only got permissions to select in database A but I can create tables and insert/update etc in database B. The manipulation and insertion part is written in perl and already in use for loading data into database B from other data sources, so all that's required is to get the necessary data from database A and using it to initialize the perl classes. How can I go about doing this so I can easily track back and pick up from where the error happened if any error occurs during the manipulation or insertion procedures (database disconnection, problems with class initialization because of invalid values, hard disk failure etc...)? Doing the transaction in one go doesn't seem like a good option because the amount data from database A means it would take at least a day or 2 for data manipulation and insertion into database B. The data from database A can be grouped into around 1000 groups using unique keys, with each key containing 1000s of rows each. One way I thought I could do is to write a script that does commits per group, meaning I've got to track which group has already been inserted into database B. The only way I can think of to track the progress of which groups have been processed or not is either in a log file or in a table in database B. A second way I thought could work is to dump all the necessary fields needed for loading the classes for manipulation and insertion into a flatfile, read the file to initialize the classes and insert into database B. This also means that I got to do some logging, but should narrow it down to the exact row in the flatfile if any error occurs. The script will look something like this: use strict; use warnings; use DBI; #connect to database A my $dbh = DBI->connect('dbi:oracle:my_db', $user, $password, { RaiseError => 1, AutoCommit => 0 }); #statement to get data based on group unique key my $sth = $dbh->prepare($my_sql); my @groups; #I have a list of this already open my $fh, '>>', 'my_logfile' or die "can't open logfile $!"; eval { foreach my $g (@groups){ #subroutine to check if group has already been processed, either from log file or from database table next if is_processed($g); $sth->execute($g); my $data = $sth->fetchall_arrayref; #manipulate $data, then use it to load perl classes for insertion into database B #. #. #. } print $fh "$g\n"; }; if ($@){ $dbh->rollback; die "something wrong...rollback"; } So if any errors do occur, I can just run this script again and it should skip the groups or rows that have been processed and continue. Both these methods is just variations on the same theme, and both require going back to where I've been tracking my progress (in table or file), skip the ones that've been commited to database B and process the remaining data. I'm sure there's a better way of doing this but am struggling to think of other solutions. Is there another way of handling large transactions between databases that require data manipulation between getting data out from one and inserting into another? The process doesn't need to be all in Perl, as long as I can reuse the perl classes for manipulating and inserting the data into the database.

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  • Updating an Entity through a Service

    - by GeorgeK
    I'm separating my software into three main layers (maybe tiers would be a better term): Presentation ('Views') Business logic ('Services' and 'Repositories') Data access ('Entities' (e.g. ActiveRecords)) What do I have now? In Presentation, I use read-only access to Entities, returned from Repositories or Services, to display data. $banks = $banksRegistryService->getBanksRepository()->getBanksByCity( $city ); $banksViewModel = new PaginatedList( $banks ); // some way to display banks; // example, not real code I find this approach quite efficient in terms of performance and code maintanability and still safe as long as all write operations (create, update, delete) are preformed through a Service: namespace Service\BankRegistry; use Service\AbstractDatabaseService; use Service\IBankRegistryService; use Model\BankRegistry\Bank; class Service extends AbstractDatabaseService implements IBankRegistryService { /** * Registers a new Bank * * @param string $name Bank's name * @param string $bik Bank's Identification Code * @param string $correspondent_account Bank's correspondent account * * @return Bank */ public function registerBank( $name, $bik, $correspondent_account ) { $bank = new Bank(); $bank -> setName( $name ) -> setBik( $bik ) -> setCorrespondentAccount( $correspondent_account ); if( null === $this->getBanksRepository()->getDefaultBank() ) $this->setDefaultBank( $bank ); $this->getEntityManager()->persist( $bank ); return $bank; } /** * Makes the $bank system's default bank * * @param Bank $bank * @return IBankRegistryService */ public function setDefaultBank( Bank $bank ) { $default_bank = $this->getBanksRepository()->getDefaultBank(); if( null !== $default_bank ) $default_bank->setDefault( false ); $bank->setDefault( true ); return $this; } } Where am I stuck? I'm struggling about how to update certain fields in Bank Entity. Bad solution #1: Making a series of setters in Service for each setter in Bank; - seems to be quite reduntant, increases Service interface complexity and proportionally decreases it's simplicity - something to avoid if you care about code maitainability. I try to follow KISS and DRY principles. Bad solution #2: Modifying Bank directly through it's native setters; - really bad. If you'll ever need to move modification into the Service, it will be pain. Business logic should remain in Business logic layer. Plus, there are plans on logging all of the actions and maybe even involve user permissions (perhaps, through decorators) in future, so all modifications should be made only through the Service. Possible good solution: Creating an updateBank( Bank $bank, $array_of_fields_to_update) method; - makes the interface as simple as possible, but there is a problem: one should not try to manually set isDefault flag on a Bank, this operation should be performed through setDefaultBank method. It gets even worse when you have relations that you don't want to be directly modified. Of course, you can just limit the fields that can be modified by this method, but how do you tell method's user what they can and cannot modify? Exceptions?

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  • Ninject & Entity Framework =(sometimes) "The ObjectContext instance has been disposed ..."

    - by n26
    I am using Ninject and ADO.Net Entity Framework in my Aps.Net (Mvc) website. I bind the ObjectContext to Ninject using the RequestScope: Bind<Entities>().ToSelf().InRequestScope().WithConstructorArgument("connectionString", _connectionString); In most cases this works perferct. But sometimes I got the following error: The ObjectContext instance has been disposed and can no longer be used for operations that require a connection. This error occurs at different positions while getting, updating, inserting or deleting data. In some cases this error occurs until I reset my webapp and sometimes it disappears after some requests. I am displeased that I have no more details. Because it seems that there is no pattern when and where this error occurs. Because the time and position is allways different :( Some hints or ideas?

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  • Entity Framework 4 POCO entities in separate assembly, Dynamic Data Website?

    - by steve.macdonald
    Basically I want to use a dynamic data website to maintain data in an EF4 model where the entities are in their own assembly. Model and context are in another assembly. I tried this http://stackoverflow.com/questions/2282916/entity-framework-4-self-tracking-entities-asp-net-dynamic-data-error but get an "ambiguous match" error from reflection: System.Reflection.AmbiguousMatchException was unhandled by user code Message=Ambiguous match found. Source=mscorlib StackTrace: at System.RuntimeType.GetPropertyImpl(String name, BindingFlags bindingAttr, Binder binder, Type returnType, Type[] types, ParameterModifier[] modifiers) at System.Type.GetProperty(String name) at System.Web.DynamicData.ModelProviders.EFTableProvider..ctor(EFDataModelProvider dataModel, EntitySet entitySet, EntityType entityType, Type entityClrType, Type parentEntityClrType, Type rootEntityClrType, String name) at System.Web.DynamicData.ModelProviders.EFDataModelProvider.CreateTableProvider(EntitySet entitySet, EntityType entityType) at System.Web.DynamicData.ModelProviders.EFDataModelProvider..ctor(Object contextInstance, Func1 contextFactory) at System.Web.DynamicData.ModelProviders.SchemaCreator.CreateDataModel(Object contextInstance, Func1 contextFactory) at System.Web.DynamicData.MetaModel.RegisterContext(Func`1 contextFactory, ContextConfiguration configuration) at WebApplication1.Global.RegisterRoutes(RouteCollection routes) in C:\dev\Puffin\Puffin.Prototype.Web\Global.asax.cs:line 42 at WebApplication1.Global.Application_Start(Object sender, EventArgs e) in C:\dev\Puffin\Puffin.Prototype.Web\Global.asax.cs:line 78 InnerException:

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  • Entity Framework vs. nHibernate for Performance, Learning Curve overall features

    - by hadi
    I know this has been asked several times and I have read all the posts as well but they all are very old. And considering there have been advancements in versions and releases, I am hoping there might be fresh views. We are building a new application on ASP.NET MVC and need to finalize on an ORM tool. We have never used ORM before and have pretty much boiled down to two - nHibernate & Entity Framework. I really need some advice from someone who has used both these tools and can recommend based on experience. There are three points that I am focusing on to finalize - Performance Learning Curve Overall Capability Your advice will be highly appreciated. Best Regards,

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  • Entity Framework: EntityCommand automatically parsing and determine parameter types?

    - by Torben Rahbek Koch
    Hi everybody, Pretty new to Entity Framework I must admit, but I simply cannot believe that there is no built-in solution for this problem. Let's say I create an EntityCommand: EntityCommand cmd = conn.CreateCommand(); cmd.CommandType = CommandType.Text; cmd.CommandText = commandText; And let's say the the commandText is something like this: SELECT sp.UserName, sp.Rights FROM EntityContext.Users as sp WHERE sp.UserName=@UserName Now it would be really neat if the Parameters collection of cmd could be automatically filled. The framework should obviously know the types etc. but I guess that's simply not how it works beneath. The problem is that the commandText is configurable on run-time, and I must show some GUI that asks for values of the parameters. Any idea on how this could be accomplished? Thanks for any ideas and for listening!

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  • Entity Framework 4 relationship management in POCO Templates - More lazy than FixupCollection?

    - by Joe Wood
    I've been taking a look at EF4 POCO templates in beta 2. The FixupCollection looks fine for maintaining the model correctness after updating the relationship collection property (i.e. product.Orders it would set the order.Product reference ). But what about support for handling the scenario when some of those Order objects are removed from the context? The use-case of maintaining cascading deletes in the in-memory model. The old Typed DataSet model used to do this by performing the query through the container to derive the relationship results. Like the DataSet, this would require a reference to the ObjectContext inside the entity class so that it could query the top-level Order collection. Better support for Separation of Concerns in the ObjectContext would be required. It looks like EF is not suited to this use-case that DataSets did out of the box.... am I right?

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  • Why does a newly created EF-entity throw an ID is null exception when trying to save?

    - by Richard
    I´m trying out entity framework included in VS2010 but ´ve hit a problem with my database/model generated from the graphical interface. When I do: user = dataset.UserSet.CreateObject(); user.Id = Guid.NewGuid(); dataset.UserSet.AddObject(user); dataset.SaveChanges(); {"Cannot insert the value NULL into column 'Id', table 'BarSoc2.dbo.UserSet'; column does not allow nulls. INSERT fails.\r\nThe statement has been terminated."} The table i´m inserting into looks like so: -- Creating table 'UserSet' CREATE TABLE [dbo].[UserSet] ( [Id] uniqueidentifier NOT NULL, [Name] nvarchar(max) NOT NULL, [Username] nvarchar(max) NOT NULL, [Password] nvarchar(max) NOT NULL ); GO -- Creating primary key on [Id] in table 'UserSet' ALTER TABLE [dbo].[UserSet] ADD CONSTRAINT [PK_UserSet] PRIMARY KEY CLUSTERED ([Id] ASC); GO Am I creating the object in the wrong way or doing something else basic wrong?

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  • 3 methods for adding a "Product" through Entity Framework. What's the difference?

    - by Kohan
    Reading this MSDN article titled "Working with ObjectSet (Entity Framework)" It shows two examples on how to add a Product.. one for 3.5 and another for 4.0. http://msdn.microsoft.com/en-us/library/ee473442.aspx Through my lack of knowledge I am possibly completely missing something here, but i never added a Product like this: //In .NET Framework 3.5 SP1, use the following code: (ObjectQuery) using (AdventureWorksEntities context = new AdventureWorksEntities()) { // Add the new object to the context. context.AddObject("Products", newProduct); } //New in .NET Framework 4, use the following code: (ObjectSet) using (AdventureWorksEntities context = new AdventureWorksEntities()) { // Add the new object to the context. context.Products.AddObject(newProduct); } I would not have done it either way and just used: // (My familiar way) using (AdventureWorksEntities context = new AdventureWorksEntities()) { // Add the new object to the context. context.AddToProducts(newProduct); } What's the difference between these three ways? Is "My way" just another way of using an ObjectQuery? Thanks, Kohan

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  • Entity Framework - Why does EF use LEFT OUTER JOIN's in a 1-to-1 join?

    - by Taylor L
    Why does .NET Entity Framework produce SQL that uses a subquery and left outer join on a simple 1-to-1 relationship? I expected to see a simple join on the two tables. I'm using Devart Dotconnect for Oracle. Any ideas? Below is the output I see courtesy of the EFTracingProvider: SELECT 1 AS C1, "Join1".USER_ID1 AS USER_ID, ... FROM "MY$NAMESPACE".MYTABLE1 "Extent1" INNER JOIN (... FROM "MY$NAMESPACE".MYTABLE2 "Extent2" LEFT OUTER JOIN "MY$NAMESPACE".MYTABLE1 "Extent3" ON "Extent2".OTHER_ID = "Extent3".OTHER_ID ) "Join1" ON "Extent1".OTHER_ID = "Join1".OTHER_ID1 WHERE "Extent1".USER_ID = :EntityKeyValue1 -- EntityKeyValue1 (dbtype=String, size=6, direction=Input) = "000000"

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  • Entity Framework - Why does EF use LEFT OUTER JOIN's in a 1-to-1 relationship?

    - by Taylor L
    Why does .NET Entity Framework produce SQL that uses a subquery and left outer join on a simple 1-to-1 relationship? I expected to see a simple join on the two tables. I'm using Devart Dotconnect for Oracle. Any ideas? Below is the output I see courtesy of the EFTracingProvider: SELECT 1 AS C1, "Join1".USER_ID1 AS USER_ID, ... FROM "MY$NAMESPACE".MYTABLE1 "Extent1" INNER JOIN (... FROM "MY$NAMESPACE".MYTABLE2 "Extent2" LEFT OUTER JOIN "MY$NAMESPACE".MYTABLE1 "Extent3" ON "Extent2".OTHER_ID = "Extent3".OTHER_ID ) "Join1" ON "Extent1".OTHER_ID = "Join1".OTHER_ID1 WHERE "Extent1".USER_ID = :EntityKeyValue1 -- EntityKeyValue1 (dbtype=String, size=6, direction=Input) = "000000"

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  • How can i query for null values in entity framework?

    - by AZ
    I want to execute a query like this var result = from entry in table where entry.something == null select entry; and get an IS NULL generated. Edited: After the first two answers i feel the need to clarify that I'm using Entity Framework and not Linq to SQL. The object.Equals() method does not seem to work in EF. Edit no.2: The above query works as intended. It correctly generates IS NULL. My production code however was var value = null; var result = from entry in table where entry.something == value select entry; and the generated SQL was something = @p; @p = NULL. It seems that EF correctly translates the constant expression but if a variable is involved it treats it just like a normal comparison. Makes sense actually. I'll close this question

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  • Get correct output from UTF-8 stored in VarChar using Entity Framework or Linq2SQL?

    - by jasonpenny
    Borland StarTeam seems to store its data as UTF-8 encoded data in VarChar fields. I have an ASP.NET MVC site that returns some custom HTML reports using the StarTeam database, and I would like to find a better solution for getting the correct data, for a rewrite with MVC2. I tried a few things with Encoding GetBytes and GetString, but I couldn't get it to work (we use mostly Delphi at work); then I figured out a T-SQL function to return a NVarChar from UTF-8 stored in a VarChar, and created new SQL views which return the data as NVarChar, but it's slow. The actual problem appears like this: “description†instead of “description”, in both SSMS and in a webpage when using Linq2SQL Is there a way to get the proper data out of these fields using Entity Framework or Linq2SQL?

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  • Query data using LINQ to SQL and Entity Framework with foreign key? (Help me please)

    - by The Wind
    Hello! There is a problem I need help with your query on the data using LINQ to SQL and Entity Framework (I'm using Visual Studio 2010). My picure here: http://img.tamtay.vn/files/photo2/2010/5/28/10/962/4bff3a3b_1093f58f_untitled-1.gif I have three tables: tbl NewsDetails tblNewsCategories tblNewsInCategories (See screen 1 in my picture) Now, I want to retrieve records in the tblNewsDetails table, with condition: CategoryId=1, as the following results: (See screen 2 in my picture) But NewsID and CategoryId in tblNewsInCategories table is two foreign key, I do not see them and I do not know how to use them in your code. My code has errors: (See screen 3 in my picture) Please help me. Thanks! (I am a new member, should not have the right to insert images)

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  • How to organize asp.net mvc project (using entity framework) and a corresponding database project?

    - by Bernie
    I recently switched to vs2010 and am experimenting with asp.net MVC2. I am building a simple website and use the entity framework to design the data model. From the .edmx file, I generate the database tables. After a few iterations, I decided that it would be nice to have version control of the database schema as well, and therefore I added a database project into which I imported the script that is generated from the datamodel. As a result, I have to generate the sql every time that I change the model and redo the import. The database project automatically updates the database. Although the manual steps to generate the sql and the import are annoying, this works pretty well, until I wanted to add the standard tables for user accounts/authorization etc. I can use the framework tools to add the necessary tables, views etc. to the database, but as I do not want to have them in the .edmx model I end up with a third manual step. Is anybody facing similar issues?

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  • Is the first persistance of an Entity Data Model in EF 4.0 slower due to the connection cost ?

    - by Scott Davies
    Hi, I've got a console app written that persists an object graph via Entity Framework 4.0. I loop through this to dump the execution times for each persistance. The first persistance is always the largest. Is this due to EF making the initial connection to the database and/or JIT'ing ? Here's a sample of the output: Persisted graph in **3318** millseconds. Persisted graph in 25 millseconds. Persisted graph in 26 millseconds. Persisted graph in 22 millseconds. Thanks, Scott

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