How to update existing project to entity framework 5.0

Adding existing entities to a collection on a newly built object using the entity framework

I am using the Entity framework to create a new order. The order contains a collection of contacts, a many to many relationship. I want to add a reference to an existing contact on the order on creation of the order. Both Order and Contact a Entity Objects.... Order order = new Order(); //set details on order Contact contact = new Contact();...

Create POCO classes in a distinct project from the Entity Framework model project.

@Nick,...To force the regeneration of the POCO entities, you just need to right-click the main .tt file and select "Run Custom Tool". This will force it to regenerate your POCO classes with your updated changes to the .edmx model....Is there any problem with you going ahead and Right-clicking the model and selecting "Generate Database from Model..

If a row already exists, update it; otherwise, insert logic using Entity Framework.

As of Entity Framework 4.3, there is an ...AddOrUpdate... method at namespace ...System.Data.Entity.Migrations...:...public static void AddOrUpdate<TEntity>( this IDbSet<TEntity> set, params TEntity[] entities ) where TEntity : class ...which by the ...doc...:...Adds or updates entities by key when SaveChanges is called. Equivalent to an ...

Avoiding the if-exists-update-else-insert race problem in Entity Framework

Just to add my way, not that it really deals with the annoyance of exceptions being thrown and transactions not quite cutting it as a scalable solution but it does avoid race conditions from causing problems where lock type solutions are not possible (easily managed) such as in distributed systems. ...I very simply use the exception and try the ins...

How to add Serializable attributes in all entities generated by Entity Framework 5.0

If you don't want to edit the template, you can also do this in a separate code file - because of the convenience of ...partial... classes. So if the types here are ...Foo..., ...Bar... and ...Baz... in the ...My.Namespace... namespace, you can create a ...separate... file in the same project, with:...using System; namespace My.Namespace { [Ser...

Entity Framework 6 Batch Updates and AuditLog using Entity Framework Extended

I am using Entity Framework 6 and I am using EntityFramework Extended to perform some batch updates and batch deletes. The batch updates and batch deletes work OK however I also need to know the entities that were updated / deleted (i.e. the current and previous values). I thought that using the AuditLogger provided by EntityFramework.Extended wo...

Update existing database with Entity Framework Code First in MVC

I've had this exact problem. Seems It is worth noting that there are commands in place to aid in this situation, namely the -IgnoreChanges and -Force flags....I was trimming from a multi-dbContext to single dbContext app. As you can guess the tables already existed, but the single context new nothing of the tables that were maintained in the secon...

Entity Framework Add if not exist without update

All the other answers are incorrect...."Read before write" can violate data integrity without being put inside a transaction control. ...In SQL Server, you can use merge statement. However merge statement is not available in EF.

Entity Framework not updating existing related entity

There is a second reason for the above described behavior: This code will turn off change tracking:... Context.Configuration.AutoDetectChangesEnabled = false; ...After I found this had been set in the constructor and removed it, all worked as expected.

Entity Framework (EF6) insert or update if exists for properties

Assuming the model be like:...class Foo { virtual Bar Bar {get; set ;} } class Bar { int Id { get; set; } string Property {get; set;} } class MyContext { virtual DbSet<Foo> Foos {get; set;} void OnModelCreating(DbModelBuilder modelBuilder) { modelBuilder.Entity<Bar>() .HasKey(c => c.Property); } ...