optimistic-concurrency

I'm trying to use a DateTime LastModifiedDate column with optimistic concurrency in Entity Framework (will likely upgrade it to DateTime2.) I've set the Concurrency Mode to Fixed. But when I retrieve an entity, change a column and try to save, get a concurrency exception. The stored LastModifiedDate is 2017-01-04 21:16:55.283 but look at the SQL Entity Framework is generating for the update: UPDATE [dbo].[Facilities] SET [Password] = @0 WHERE (([pk_FacilityID] = @1) AND ([LastModifiedDate] = @2)) -- @0: 'bz0dkK+smlat9psrIrbyXkxjpcXcDK1DeUiha7jCRkU=' (Type = String, Size = 255) -- @1: '6801bdcf

I am trying to implement the solution given in Handling Concurrency with the Entity Framework in an ASP.NET MVC Application . The article says: Adding a Tracking Property to the Department Entity In Models\Department.cs, add a tracking property: [Timestamp] public Byte[] Timestamp { get; set; } The Timestamp attribute specifies that this column will be included in the Where clause of Update and Delete commands sent to the database. Since I'm using a model first approach, I followed steps 1 - 5 outlined in Creating a Timestamp column with Entity Framework Add a property named “Timestamp” to the

A StaleObjectStateException is being thrown in my app instead of OptimisticLockException (as I read I should expect this one) when optimistic concurrency problem occurs in my app. No need to post code, as it's the most basic concurrency problem - wrong version in a timestamp column. How am I supposed to get OptimisticLockException, not the other one? gerrytan StaleObjectStateException is thrown when you use straight hibernate API. OptimisticLockException is thrown if you used JPA style hibernate. If this confuses you please read: What's the difference between JPA and Hibernate? Use try catch

We have an ASP.Net MVC application that uses EF4 as its data access layer and we're seeing unexpected behaviour with regards to OptimisitcConcurrencyExceptions not being thrown when we think they should be. We have simplified the problem down to the following code... using System.Linq; using Project.Model; namespace OptimisticConcurrency { class Program { static void Main() { Contact firstContact = null; using (var firstEntities = new ProjectEntities()) { firstContact = (from c in firstEntities.Contacts where c.LastName == "smith" select c).Single(); } using (var secondEntities = new

I am trying to implement Optimistic locking in-order to avoid lost update situation. In my application when two user fetch same record and the first user updates it with some changes. This change is not visible to the second user who view the same record and he makes some changes by himself and updates it. Due to which the first persons change is lost. In-order to prevent this I have written the following but still the issue persist. I am new to this concept, not able to identify the issue. I have tried to achieve this by reading doc 11.3.4. Customizing automatic versioning section. The

[This is a list of common questions I see about Spring MVC, which are solved in similar ways. I've posted them here, so I can easily refer to them from other questions] How do I update only a few fields of a model entity with forms? How do I use the Post-Redirect-Get pattern with Spring MVC, especially with form validation? How do I secure certain fields in my entities? How do I implement Optimistic Concurrency Control ? To partially update an entity, you should use @SessionAttributes to store the model in session between requests. You could use hidden form fields, but session is more secure.