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• How can I edit an entity in MVC4 with EF5 which has a unique constraint?

  - by Yoeri

  [HttpPost] public ActionResult Edit(Car car) { if (ModelState.IsValid) { db.Entry(car).State = EntityState.Modified; db.SaveChanges(); return RedirectToAction("Index"); } return View(car); } This is a controller method…

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• Can I create many tables according to the same entity?

  - by jacob

  What I want to do is that I want to make the many tables dinamically which are the same entity structures. And then I want to refer to the dinamically created tables according to the table name. What I understood from hibernate reference is that I can only create only one table and it should be matched exactly with entity. So I can't find…

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• Too Many Left Outer Joins in Entity Framework 4?

  - by Adam

  I have a product entity, which has 0 or 1 "BestSeller" entities. For some reason when I say: db.Products.OrderBy(p = p.BestSeller.rating).ToList(); the SQL I get has an "extra" outer join (below). And if I add on a second 0 or 1 relation ship, and order by both, then I get 4 outer joins. It seems like each such entity is producing 2…

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• Can I create a transaction using ADO NET Entity Data Model?

  - by Junior Mayhé

  Hi is it possible on the following try-catch to execute a set of statements as a transaction using ADO NET Entity Data Model? [ValidateInput(false)] [AcceptVerbs(HttpVerbs.Post)] public ActionResult Create(Customer c) { try { c.Created = DateTime.Now; c.Active = true; c.FullName =…

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• Is it possible to have a dynamic data ASP.net web application using Entity Framework?

  - by Greg

  Is it possible to have a dynamic data ASP.net web application using Entity Framework?

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• Foreign Key vs. Independent Relationships - is there improvement with Entity Framework 5?

  - by zam6ak

  I have read several articles and questions on concept of foreign key vs independent relationship when using Entity Framework. And I am still not 100% sure which way to go.... I would prefer not to "pollute" my domain POCOs by having a property that will be used in FK relationship when I already have a property…

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• NHibernate & Cancelling Changes to Entities

  - by user129609

  Hi, This seems like it would be a common issue to be but I don't know the best way to solve it. I want to be able to send an Entity to a view, have changes be made to the entity in the view, but then cancel (remove) those changes if the user cancels out of the view. What is the proper way to do this. Here…

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• Will TSQL become useless because of new ORMs? [closed]

  - by Saeed Neamati

  By introducing LINQ to SQL, I found myself and my .NET developer colleagues gradually moving from TSQL to C# to create queries on the database. Entity Framework made that shift almost permanent. Now it's nearly 2 years that I use LINQ to SQL and LINQ to Entities and haven't used TSQL that much. Yesterday,…

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• Accessing Repositories from Domain

  - by Paul T Davies

  Say we have a task logging system, when a task is logged, the user specifies a category and the task defaults to a status of 'Outstanding'. Assume in this instance that Category and Status have to be implemented as entities. Normally I would do this: Application Layer: public class TaskService { //... …

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• How does an Engine like Source process entities?

  - by Júlio Souza

  [background information] On the Source engine (and it's antecessor, goldsrc, quake's) the game objects are divided on two types, world and entities. The world is the map geometry and the entities are players, particles, sounds, scores, etc (for the Source Engine). Every entity has a think function, which…

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• How to profile LINQ to Entities queries in your asp.net applications - part 3

  - by nikolaosk

  In this post I will continue exploring ways on how to profile database activity when using the Entity Framework as the data access layer in our applications. If you want to read the first post of the series click here . If you want to read the second post of the series click here . In this post I will use…

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• How to profile LINQ to Entities queries in your asp.net applications - part 2

  - by nikolaosk

  In this post I will continue exploring ways on how to profile database activity when using the Entity Framework as the data access layer in our applications. I will use a simple asp.net web site and EF to demonstrate this. If you want to read the first post of the series click here . In this post I will…

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• Detach an entity from a JPA persistence context (JPA 2.0 / Hibernate / EJB 3 / J2EE 6)

  - by Julien

  Hi, I wrote a stateless EJB method allowing to get an entity in "read-only" mode. The way to do this is to get the entity with the EntityManager then detach it (using the JPA 2.0 EntityManager). My code is the following: @PersistenceContext private EntityManager entityManager; public T…

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• doctrine2: many-to-one with non default referencedColumnName does not persist entity

  - by timaschew

  I'm using symfony 2.1.2 with FOSUserBundle. I extend the User from FOS and define a many-to-one (bidirectional) association to a Customer entity. I don't want to use primary key for the association (referencedColumnName). I will use another integer uniqe column: customer_no use…

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• Removing entity bug

  - by Greg

  hello, I am trying out the ria services and I am experiencing this problem that seems very strange to me. I am creating a new entity of type "House" and add it to context without saving the context so the id of the new entity is 0, after i remove this entity and add another new…

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• ria entity remove bug

  - by Greg

  hello, I am trying out the ria services and I am experiencing this problem that seems very strange to me. I am creating a new entity of type "House" and add it to context without saving the context so the id of the new entity is 0, after i remove this entity and add another new…

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• Linq to Sql: Update Entity throug a new Object

  - by Dänu

  Hey Guys I'd like to update an entity via linq, but since I edit the entity in a view after serializing it, I don't have direct access to the entity inside the data context. I could do it like this: entity.property1 = obj.property1; entity.property2 = obj.property2; ... …

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• Hibernate entities: columns without entity properties

  - by lewap

  Is there a way to "magically" persist a column which is not represented as a property in an entity? Concretely I want to add audit info to an entity without having the audit info on the entity. The audit values are not stored in the entity, but are retrieved from the…

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• Announcing Entity Framework Code-First (CTP5 release)

  - by ScottGu

  This week the data team released the CTP5 build of the new Entity Framework Code-First library.  EF Code-First enables a pretty sweet code-centric development workflow for working with data.  It enables you to: Develop without ever having to open a…

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• Idiomatic default sort using WCF RIA, Entity Framework 4, Silverlight 4?

  - by Duncan Bayne

  I've got two Silverlight 4.0 ComboBoxes; the second displays the children of the entity selected in the first: <ComboBox Name="cmbThings" ItemsSource="{Binding Path=Things,Mode=TwoWay}" DisplayMemberPath="Name" …

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• How to update non-scalar entity properties in EF 4.0?

  - by Mike

  At first I was using this as an extension method to update my detached entities... Public Sub AttachUpdated(ByVal obj As ObjectContext, ByVal objectDetached As EntityObject) If objectDetached.EntityState = EntityState.Detached…

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• In this example, would Customer or AccountInfo properly be the entity group parent?

  - by Badhu Seral

  In this example, the Google App Engine documentation makes the Customer the entity group parent of the AccountInfo entity. Wouldn't AccountInfo encapsulate Customer rather than the other way around? Normally I would think of an…

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• How do I serialize/deserialize a NHibernate entity that has references to other objects?

  - by Daniel T.

  I have two NHibernate-managed entities that have a bi-directional one-to-many relationship: public class Storage { public virtual string Name { get; set; } public virtual IList<Box> Boxes { get; set; } } public…

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• How To Update EF 4 Entity In ASP.NET MVC 3?

  - by Jason Evans

  Hi there. I have 2 projects - a class library containing an EDM Entity Framework model and a seperate ASP.NET MVC project. I'm having problems with how your suppose to edit and save changes to an entity using MVC. In my…

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• Entity Framework + MySQL - Why is the performance so terrible?

  - by Cyril Gupta

  When I decided to use an OR/M (Entity Framework for MySQL this time) for my new project I was hoping it would save me time, but I seem to have failed it (for the second time now). Take this simple SQL Query SELECT *…

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