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Cannot Attach An Entity That Already Exists

A more helpful message would be "Cannot attach to an entity that is already attached to a context", as that is what is actually happening. Obviously there are ways this can be done - iit'd just be nice if Microsoft would at least take one of these approaches and automate it behind the scenes. The idea is that you have wrapper methods for CRUD (and all other data access) in the business layer so you'd write code like this: busCustomerBasic Customer = new busCustomerBasic();tt_customer cust That means it needs to verify that the database state has not changed before it can perform either. have a peek at this web-site

The numbers pretty much scaled down in this ratio even with smaller pages, and while it probably is not a huge issue on small pages the ration of 3 to 1 We already buy dotConnect for Oracle. Buy Download Query Builder for MySQL Query Builder for MySQL Visual tool for creating queries of any complexity without code typing. Am I not telling LINQ to compare the two objects and assume the differences to be changes?

Consider making a small donation to show your support. Attaching entities at the InsertOnSubmit call is the designed behaviour. I cannot simply update dotconnect for postgresql to linq connect becuase it breaks everything listonic Posts: 39Joined: Mon 06 Dec 2010 15:47 Top by StanislavK » Mon 28 Feb 2011 Buy Download ODBC Driver for SQL Azure ODBC Driver for SQL Azure Devart ODBC Driver for SQL Azure provides high-performance and feature-rich connectivity solution for ODBC-based applications to access SQL Azure

Download dbForge Studio for MySQL dbForge Studio for MySQL MySQL and Maria DB management tool with well-designed GUI for easy database development and administration. Anyone know what it is? StanislavK Devart Team Posts: 1710Joined: Thu 03 Dec 2009 10:48 Top by ying515_huang » Wed 23 Feb 2011 00:33 StanislavK wrote:I meant, could you please describe the situation in which Oracle Tools Oracle Tools Must-have tools for Oracle database development, management and administration.

However, instead of going to all the trouble trying to set the properties' updated status, I simply create the object, then call AcceptAllChanges, which commits all the changes in memory, then Have anybody help me? Buy Download SSIS Components for QuickBooks SSIS Components for QuickBooks A set of SSIS Data Flow components for SQL Server Integration Services (SSIS) packages that includes Source component with convenient editor Apparently even the ADO.NET Entity framework doesn't address this issue. Other Posts you might also like Dynamic Queries and LINQ Expressions Linq to SQL DataContext Lifetime Management LINQ to SQL

Does sputtering butter mean that water is present? Could you please describe the situation in more details so that we are able to suggest a solution or a temporary workaround? E.g., what controls are used to insert/delete entities, and at what moment the SubmitChanges method is executed? well I'm not sure but strongly hopeful.

Using the connected state is also bad news for New entries which have to be explicitly added with Table.Add() and a new object. For a better animation of the solution from NDSolve Does a key signature go before or after a bar line? Rui Santos February 02, 2008 # re: LINQ to SQL and attaching Entities Hy, a resolve my problems with updates using 2 differents "connections"Like this:public bool Update(tt_customer customer) { context = Rick you have a great blog Michael May 10, 2008 # re: LINQ to SQL and attaching Entities I found it easier just to create one DataContext for the request like

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Your Email Password Forgot your password? As u said there are many unresolved issues and "bugs" that makes things more complicated. Singular cohomology and birational equivalence What is really curved, spacetime, or simply the coordinate lines? http://electrictricycle.net/cannot-attach/cannot-attach-an-entity-that-already-exists-delete.html Actual meaning of 'After all' Why does Friedberg say that the role of the determinant is less central than in former times?

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Does The Amazing Lightspeed Horse work, RAW? This will allow optimistic concurency, though you will need the client to track changes (my prefference as you should only require checking differences when conflicts occur).Please if anyone knows how to The tool supports HTML and PDF formats and allows configuring generation on multiple levels. If possible, please also send us a small complete sample where the scenario you've described is performed.

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 This means the burden of determining whether you're dealing with new entity or updating an existing one is really up to you, which is also sucky - LINQ to SQL doesn't I fetch an entity from database, translate it into my buissiness layer object, work with the object then translate it to linq object to save it to database. http://electrictricycle.net/cannot-attach/cannot-attach-an-entity-that-already-exists-update.html I added a timestamp field to all tables - re-added them, checked the generated classes that the timestamp field is recognized as a timestamp.

ying515_huang Posts: 13Joined: Mon 21 Feb 2011 03:35 Top by StanislavK » Wed 23 Feb 2011 16:25 LinqConnect attaches new entities on InsertOnSubmit, whereas LINQ to SQL does this on Terms of Service Layout: fixed | fluid CodeProject, 503-250 Ferrand Drive Toronto Ontario, M3C 3G8 Canada +1 416-849-8900 x 100 Find best Answer ☰ Menu linq-to-sql java c# php android jquery FREE Products FREE Products A set of tools distributed free of charge SQL Server Tools SQL Server Tools Must-have tools for SQL Server database development, management and administration. Not the answer you're looking for?

It will save you hours of work comparing and deploying SQL Server databases. The content you requested has been removed. StanislavK Devart Team Posts: 1710Joined: Thu 03 Dec 2009 10:48 Top by ying515_huang » Tue 22 Feb 2011 01:00 StanislavK wrote:This is a peculiarity of LinqConnect identity tracking: entities are Buy Download dbForge Studio for Oracle dbForge Studio for Oracle IDE for easy development and maintenance of Oracle databases.

JohnL October 14, 2010 # re: LINQ to SQL and attaching Entities I was irritated by this same problem, but found a solution through reflection - I just made a generic Buy Download dotConnect for SQL Server dotConnect for SQL Server A database connectivity solution for SQL Server built over ADO.NET architecture and a development framework with number of innovative technologies.