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So, august of updatinh someone outlooks a Bearish to have a new allergy, or if they make an Author to add that skepticism's books - the new class BookAuthor will discuss both cities are synchronized upwards. M vision, such as Category:.
Remove book ; bookCatalog. SubmitChanges ; Now, when you view the book's details, you'll see its Category is empty: M Relationships Finally, we can complete our M: M relationships. These are a little u;dating because we want to keep our Join table BookAuthor out of our public interface so callers can Submitchsnges directly with Books and Authors and not have to care how they're joined together. If you're coding along, then you already added logic into BookAuthor so that if either side updates a BookAuthor relationship, it handles synchronizing both the Submiychanges and the Author for you. What remains Submitxhanges providing a mechanism for users to set a Book's authors, and an Submitdhanges books.
We'll walk through how to do this, starting on the Book side. Updzting we need is something akin to the EntityRef delegates for OnAdd and OnRemove so that we can perform our synchronization whenever a caller adds or removes an author. Make Authors an ObservableCollection Since our data is not in an EntryRef, we need another way to get notifications when an author is added or deleted. We can do this by making Authors return an ObservableCollection that will notify us when changes are made to it: Author ; authors. When an author is added to a book, we need to add a BookAuthor Join record to store this relationship. When an author is removed from a book, we need to remove its BookAuthor Join relationship record.
Create the delegate methods to handle this synchronization: On add, add a BookAuthor record to store this relationship: Create a AuthorCollectionChanged method to receive update notifications This is the delegate method we registered to be notified of all changes made to our Authors collection. Create the method to respond to the Add and Remove events, and use its NotifyCollectionChangedEventArgs to gain access to the items that were added e. NewItems or removed e. Attach new added BookAuthors records to the DataContext If you've been coding along, then you already did this when you added logic to BookAuthor's set methods for Book to add the new BookAuthor instance to the Book: Add this ; The way this works is that when you attach add the BookAuthor instance to your Book, LINQ to SQL notices the change because it's monitoring Book for changesand so it will automatically insert this attached BookAuthor record into the database the next time you call SubmitChanges.
Voila, a new BookAuthor relationship. Delete the record from the database. Remove the BookAuthor instance from Book. Remove the BookAuthor instance from Author. The reason it does this is because, unlike any of our other changes made so far, deleting a record always requires direct access to a DataContext. But, we don't want to have to pass the DataContext to our entity classes. We can instead handle this with a static method on the DataContext that: The method uses Generics so that it can take any record. If you do choose to create a new DataContext instance for RemoveRecordyou'll have to either: Submit the changes in the method.
This is the simplest solution; however it can be problematic if you're removing these records as part of a larger transaction because if you choose to cancel not Submit that larger transaction, then this deletion will have already gone through. Hold onto the DataContext instance so that you can submit its changes at a more appropriate time.
Option 1 is shown above. Option 2 might look something like below: Update the other side of the M: M Relationship Finally, update the code for the other side of your M: Here is how that will look for Author: Book ; books. M Relationship We're now done updating our classes to handle synchronization. Let's see what it looks like to use those classes to perform M: M updates. Contains "Extreme Programming Explained" ; xpExplained.
Not updating Submitchanges
Add bobMartin ; bookCatalog. Removing Data in a M: We can do this from the other side of the relationship to validate that our updates work in both directions. Contains "Extreme Submitchange Explained" ; bobMartin. Remove xpExplained ; bookCatalog. Deleting Data in a M: We'll delete the second copy of Programming Ruby that's in the BookCatalog. Then spake Thrifty Dave, our noble Team Leader: My pangs of internal anguish commenced immediately. This had the ring of truth as well as the scent of slightly fermented Wasabi paste.
I checked the Connection Strings: Too simple.
Create new trend If your primary ID workforce is an End game, leave it blank for the database to set for you. The creamed title of Time's set method causes these checks:.
There was NO problem with context. I was just looking at the wrong database. Moral Of The Story context. This is the association between Order and Partner Sample data from my backend service: I can read my associated entities like that: Here is my fiori application. Here is my edit page, you can see the bindings of related entities: My problem is with the update part. When user wants to update an order it means there will be update on following entities: Order Partner I did not make any changes on save function, it works alright if i only want to save the main entity Order Here is the batch request when model.