Entity Framework Feature Suggestions

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  1. Allow SqlQuery to execute partial property select statement.

    SqlQuery does not allow you to execute select query that has missing map on your POCO class. There are case that we need to to fill our POCO class with certain selection of property only.

    1 vote
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      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
    • 3 votes
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        0 comments  ·  Flag idea as inappropriate…  ·  Admin →
      • Better support for mainframe databases like DB2

        Please add support for connecting to and using mainframe databases like DB2. We can't wait for IBM to get their act together and produce a usable EF provider.

        4 votes
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          0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
        • Support interfaces as entity and complex types

          It's unfortunate not to be able to mark interfaces for EF mapping (code first). This will allow to really abstract the implementation. Allows a unique representation of the data in the context of RIA Services (if Ria Services allows also for interface 'mapping'). This won't be very hard to implement since EF is happy when it subclasses... For the benefits: imagine you have only interfaces to declare your model. On the server side, you use EF to get your interfaces 'filled' from DB. on the client side you get those same interfaces filled by RIA services... You can reuse any…

          693 votes
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            18 comments  ·  Flag idea as inappropriate…  ·  Admin →
          • Custom mapping for complex types

            Suppose I have a complex type called "Address". I also have two entities, one called "Customer" with a "Street1" property, and a second called "Business" with an "Address1" property. Being able to map these entity properties to the same complex type would be helpful even though the property names do not match.

            7 votes
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              0 comments  ·  Flag idea as inappropriate…  ·  Admin →
            • Delete orphans support

              Entity Framework should support automatic deletion of orphan records, the way "all-delete-orphan" works in NHibernate.

              If I have a one-to-many relationship between Orders and OrderLines, and code inside the Order class calls OrderLines.Remove(orderLine), this should cause the order line to be deleted when I save changes. Currently, EF attempts to set the order line's OrderID to NULL. If the OrderID column is non-nullable, the update fails with a constraint violation error.

              I found this forum post in which Daniel Simmons from Microsoft says EF doesn't support this: http://social.msdn.microsoft.com/forums/en-us/adodotnetentityframework/thread/CB9C1C4A-DF12-44E4-B00A-417C80BF5453

              This is an important feature for an ORM, since it's difficult to…

              617 votes
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                13 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
              • Eager loading for properties of derived classes

                In entity framework there should be a way to eager load (include) navigation properties of a derived class.

                When in an data model for entity framework has a navigation property it is not posseble to eager load that navigation property besides when using OfType<> or when eager loading the derived type itself by a navigation property.
                This could be done by using a special syntax of the include path.
                Since a property of the base class can not have the same name as the derived class, it would also be possible to navigate to the derived class by its name.

                659 votes
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                  18 comments  ·  Flag idea as inappropriate…  ·  Admin →
                • dynamic discriminator

                  use in the discriminator column the assemblyqualifiedname to be able to store any class that extend the base entity

                  3 votes
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                    0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                  • Support for compact frameworks

                    support for .net CF 3.5 and 3.7 please...

                    3 votes
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                      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                    • Support for Linked SQL Servers

                      Add support for Linked servers.

                      7 votes
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                        1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                      • Support for timestamp in model-first

                        You cannot use optimistic concurrency in model-first mode. This is because the entity designer does not support a timestamp type. Even if you add a timestamp column and update your model, it turns into binary(8) in the generated SQL. Manual changes to set the type to "timestamp" in the EDMX file are overwritten and the property reverts to Binary(8).

                        As far as I can tell, this makes it impossible to use this feature in model-first mode.

                        14 votes
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                          0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                        • 12 votes
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                            0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                          • Ability to specify NoLock and other query hints

                            Table lock, update lock ( WITH(UPDLOCK) / FOR UPDATE ).
                            LockMode something like NHibernate.

                            Also should support controlling parameter sniffing

                            http://stackoverflow.com/q/9890699/85196

                            271 votes
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                              8 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                            • Visual Studio Database Project integration

                              Support for updating a Visual Studio Database Project(s) instead of updating the db directly with an ad-hoc file.

                              Currently 4.0 allows us to generate our database schema from the model but its capabilities are limited and destructive:
                              unique keys – no support
                              schema generation – destructive

                              Database Projects for Visual Studio has already matured and more importantly has the capability of updating schemas without being destructive to the data. It would be nice to see the next designer integrate fully with this product rather than re-invent the wheel. For those of us that manage our databases using Database Projects this…

                              7 votes
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                                0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                              • Weak references in the object context

                                Weak references would allow the context to cache objects but allow the caller can use a single context without wasting memory.

                                Example:
                                An embedded device where there is no clean unit of work. When something is loaded into the device it must process it, and when that something is done the user may remove it at some later point. It processes many somethings simultaneously, up to maximum capacity.

                                For now, we either use NoTracking objects or create a context for each object. This induces a lot of unnecessary overhead.

                                A weak reference would mean one context, no memory growth, but…

                                4 votes
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                                  0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                • Some more extension points to support I

                                  A way to set a ServiceLocator into the DbContext, so that EF can materialize the POCO with parametered constructors.

                                  1 vote
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                                    0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                  • A Collection which automatically sets the parent property on add

                                    class Product {
                                    Category Category;
                                    }
                                    class Category {
                                    [ParentProperty("Category")]
                                    ParentHashSet Products
                                    }

                                    var prod = new Product();
                                    var cat = new Category();

                                    cat.Products.Add(prod);
                                    Assert.AreEqual(cat, prod.Category);

                                    2 votes
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                                      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                    • ColumnAttribute to set the name of a navigation property backing onto a real column

                                      [Column("OwnerId")]
                                      public virtual User Owner { get; set; }
                                      some interest was expressed by the team on this so it may be in...

                                      5 votes
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                                        0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                      • 2 votes
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                                          0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Cascade Delete with Triggers

                                          Using triggers for cascade delete/set allows for multiple cascades on the same table where the built-in sql server cascade does not

                                          4 votes
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                                            0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
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