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Linq Submit Changes Not Working


You're calling SubmitChanges on the context, but you're never changing anything in that context. Register Login Search Search Categories Recent Tags Users Groups Your browser does not seem to support JavaScript. Good job. Why? this contact form

If you need to inspect the database for something entered by another program or thread, you have to create a new database context object to inspect the database. Join them; it only takes a minute: Sign up linq to sql submit changes not working up vote 2 down vote favorite 2 I have a list view with two colums Whenever we have a M:M Join table, as we do with BookAuthors, the join table is, of course, just two M:1 relationships, so we can mirror what we did for Book.Category. BooGhost22-Dec-09 13:52 BooGhost22-Dec-09 13:52 Just as good as the first article.

Linq Submit Changes Not Working

Thanks again, Steve Steve - Friday, July 13, 2007 1:45:27 AM How do you do caching? You apply any number of updates, inserts or deletes. Update was explained very extensively, but like many other articles it does not elaborate on Delete part.

What is really nice is that you can start off by defining your data model and have LINQ to SQL automatically handle the insert, update, delete SQL logic for you. I have a problem with the M:M relationship and hope you might help me. The method uses Generics so that it can take any record. Without a primary key, it won't do updates, and it won't tell you anything is wrong either.

Does it place the myCategory object within the DataContext, so that I can persist changes? Linq To Sql Submitchanges Too much rep? –Andrew Backer Sep 14 '12 at 5:17 add a comment| up vote 2 down vote Is the InUse property a "normal" one as far as LINQ is concerned? Coworker throwing cigarettes out of a car, I criticized it and now HR is involved Dealing With Dragonslayers How can I safely handle a concentrated (fuming) nitric acid spill? http://stackoverflow.com/questions/9231278/linq-to-sql-submit-changes-not-working Making A Solid Mesh Melt?

This section will walk through this using category.Books as an example. Hope this helps! Hope this helps, Scott ScottGu - Wednesday, July 11, 2007 6:28:42 PM Hey there Scott, thanks again for the intriguing LINQ posts. Thank you! –Serguei Fedorov Mar 18 '13 at 18:26 add a comment| up vote 0 down vote Are you checking to see if the data was updated with code or with

Linq To Sql Submitchanges

I have two boolean variables and I want to add some sql qualification depending on either or both being true. https://forums.asp.net/t/1261797.aspx?LINQ+to+SQL+SubmitChanges+not+working Do you have a primary key set? Linq Submit Changes Not Working Thanks, Scott ScottGu - Thursday, July 12, 2007 1:58:25 AM Hi Scott, >>>>> I would have preferred to see objects track their own changes and to have finer control over updates Linq To Sql Update Privacy statement Help us improve MSDN.

Let's see what it looks like to use those classes to perform M:M updates. weblink The NorthwindDataContext class has properties that represent each Table we modeled within the database (specifically: Products, Categories, Customers,Orders, OrderDetails). Can you recommend few UPCOMING books on LINQ. Regards, Barra Mats M.

Once I added a new column and made a primary key than everything worked fine. Reply Quote 4 Replies: 1 mott555 last edited by @RaceProUK Are we now playing LINQ-to-SQL Code Golf? This helped me make huge gains in my understanding of Linq-To-SQL. http://zenlinux.org/not-working/javascript-not-working-in-firefox-but-working-in-chrome.html I know I'm in the expected database, because I'm adding rows later in the same using block, submitting changes and these are showing up fine.

He might not be able to; I don't think you can add a PK via LINQ, and he may not have control over the schema. I'm glad you asked about persisting to the database in the first one - took me a little while but was good to work through the entire example! Word for a non-mainstream belief accepted as fact by a sub-culture?

Hope this helps, Scott ScottGu - Thursday, July 12, 2007 1:56:53 AM Hi Pete, >>>>>> ....

As an example, BookAuthors contains a M:1 relationship to Book and a M:1 relationship to Author in order to bridge their M:M relationship: We want our Join tables to provide a Why is "Try Again" translated to ใ‚„ใ‚Š็›ดใ™? Are there any important tools/advantages missing for LINQ in VWD...? Summary Hopefully the above post provides a good summary of how you can easily use LINQ to SQL to update your database, and cleanly integrate validation and business logic with your

How do you then do invalidation of same? My memory's fuzzy but I remember the "there's no primary key" error gets swallowed or otherwise unreported in a lot of cases. It helps me lot while developing a windows phone app. http://zenlinux.org/not-working/pie-htc-not-working-in-ie8.html auto-generating).

You can accomplish this by adding/removing data objects from the DataContext's table collections, and by then calling the SubmitChanges() method. Then, call SubmitChanges() to persist the changes to the database. When I put a InsertOnSubmit(single) line than it gave me error that "data can not be inserted because table does not have Primary key". If it uses a static or class level context it will not have the latest data.

For example, I can model each Product to be in a Category, each Order to contain OrderDetails for line-items, associate each OrderDetail line-item with a Product, and have each Customer contain public Book Book { ... You could then use LINQ to SQL on the backend master server, and use LINQ to SQL locally on the client. SubmitChanges() would only see changes for the current context, not the context that getRecord(ID) used.

What power do I have as a driver if my interstate route is blocked by a protest? So I have added the M:M mapping table to my context class. You need to dispose of DataContexts when you are done with them! Could there be a problem with my .dbml?

Don't put irrelevant crap the framework does for you in your own code. although, perhaps that should rather be an ArgumentException for the OnPhoneChanging method. But doing so >>>ensures that all validation logic you've applied to your data model successfully executes >>>prior to the deletion being committed. You do not have to tell Linq To Sql which objects you've changed; that's what change-tracking is for.

This is invaluable in debugging why L2S stuff isn't working as expected. How do you then do invalidation of same? To do this, retrieve Bob Martin and the book from your DataContext, add BobMartin to the book's authors, and SubmitChanges(): BookCatalog bookCatalog = new BookCatalog( ); Author bobMartin = bookCatalog.Authors.Single( author So you don't miss anything.

Adding New Data You can add new records to the database by creating new objects and adding them to the appropriate Table collection in your DataContext.