One problem that I can't seem to resolve with the data context is how to update Entities based on POCO objects that didn't originate out of the DataContext. You’ll be auto redirected in 1 second. bzburns August 13, 2007 # re: LINQ to SQL and attaching Entities The databinding numbers are staggering. Why was Susan treated so unkindly? http://gpscheduler.com/cannot-attach/cannot-attach-an-entity-that-already-exists-deleteonsubmit.html
It is urgent, thanks! Is there a name for the (anti- ) pattern of passing parameters that will only be used several levels deep in the call chain? I resolved this issue by initializing the datacontext object in each iteration. ying515_huang Posts: 13Joined: Mon 21 Feb 2011 03:35 Top by ying515_huang » Tue 22 Feb 2011 05:41 ying515_huang wrote:StanislavK wrote:This is a peculiarity of LinqConnect identity tracking: entities are attached http://stackoverflow.com/questions/2605657/cannot-attach-an-entity-that-already-exists
PostgreSQL Tools PostgreSQL Tools Must-have tools for PostgreSQL database development, management and administration. Why is this C++ code faster than my hand-written assembly for testing the Collatz conjecture? Hope this helps out anyone who stumbles upon this share|improve this answer answered Jun 15 '11 at 19:01 Collin O'Connor 64831627 add a comment| Your Answer draft saved draft discarded I've written it up as a short article at http://tonesdotnetblog.wordpress.com.
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Buy Download Index Manager Index Manager A handy SSMS add-in for analyzing the status of SQL indexes, fixing issues with index fragmentation, and detecting databases that require maintanance. Buy Download Data Compare for Oracle Data Compare for Oracle Tool for safe and efficient comparison and synchronization of Oracle data, convenient data differences management in a well-designed interface. May 08, 2009 12:26 AM|asifchouhan|LINK Go through this link http://west-wind.com/weblog/posts/134095.aspx http://social.msdn.microsoft.com/Forums/en-US/adodotnetentityframework/thread/7f16af28-c479-4a25-9063-0ae09f5fb9eb http://geekswithblogs.net/michelotti/archive/2007/12/30/118076.aspx Regards Asif Please remember to click “Mark as Answer” on the post that helps you. Buy Download SSIS Components for BigCommerce SSIS Components for BigCommerce A set of SSIS Data Flow components for SQL Server Integration Services (SSIS) packages that includes Source component with convenient editor
I agree that it can quickly become cumbersome if you need to reattach more than the main entity and maybe a single child collection. http://forums.asp.net/t/1420514.aspx?Cannot+attach+an+entity+that+already+exists+ Post a reply 18 posts • Page 1 of 2 • 1, 2 Cannot attach an entity with the key that already exists. Buy Download Event Profiler for SQL Server Event Profiler for SQL Server Convenient GUI to SQL Trace for inspecting SQL Server Database Engine instance. Jeremy January 24, 2008 # re: LINQ to SQL and attaching Entities It seems like you're all trying to do LinQ-to-Entities functionality only using LINQ-to-SQL instead.I'd recommend checking out the the
Singular cohomology and birational equivalence What is really curved, spacetime, or simply the coordinate lines? have a peek at these guys It is also possible to tell LINQ to SQL to 'just update all the fields', you do this with the Attach overload that takes a boolean second parameter. When answering a question please: Read the question carefully. Learn more Schema Compare for Oracle Schema Compare for Oracle Tool for safe comparison and synchronization of database schemas, easy analysis of database structure differences and deployment of changes to a
Steve August 13, 2007 # re: LINQ to SQL and attaching Entities That whole 'playback' model seems quirky to me.So, I make an update to an object, let's say from that Consider making a small donation to show your support. We already buy dotConnect for Oracle. check over here Let's work to help developers, not make them feel stupid.
I changed one method signature and broke 25,000 other classes. Kanakala August 06, 2008 # re: LINQ to SQL and attaching Entities hi,I had the same problem in my application. Browse other questions tagged c# model-view-controller or ask your own question.
Browse other questions tagged c# linq-to-sql or ask your own question. Not the answer you're looking for? It works for single entities but if you have child entities or collections you'll find that those don't update properly. So, is this the way it's supposed to work or a bug?
However the following error occurs when saving Cannot attach an entity that already exists. I added a timestamp field to all tables - re-added them, checked the generated classes that the timestamp field is recognized as a timestamp. Download Search Search A FREE add-in for SQL Server Management Studio that allows you to quickly search SQL objects and data in your databases. this content it has worked out well for me ...
Leo H November 21, 2008 # re: LINQ to SQL and attaching Entities Has anyone implemented Rick's suggestion of looping through the properties and assigning only when the property values differt? Could you please describe the situation in more details so that we are able to suggest a solution or a temporary workaround? That means it needs to verify that the database state has not changed before it can perform either. My scenario is like this I do var res = (from i in Table where i.Query == query && i.SessionId == sessionId select new UserUniChoice(i)).FirstOrDefault(); then work with UserUniChoice object which
I've noted our findings here:http://community.omnicom.no/blogs/lea/archive/2008/04/25/updating-objects-with-linq-on-a-different-datacontext-instance.aspx Sorin May 02, 2008 # re: LINQ to SQL and attaching Entities Solution posted by Rui Santos doesn't check for a concurent change to the data
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