Entity Framework Feature Suggestions

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  1. Result of Sum() of an empty set should be 0 rather than NULL in LINQ to Entities

    Currently if an empty set is expected it is necessary to cast either the result or the input elements of Sum to Nullable<T> to compensate for the type mismatch between the SQL database and the signature of the methods in LINQ.

    35 votes
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      6 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
    • More constructors for providing connection string information to MigrateDatabaseToLatestVersion

      I'm obtaining my connection string through a non-default mechanism. When I Database.SetInitializer() to the MigrateDatabaseToLatestVersion<,> class, I cannot specify a DBConnection, DBConnectionInfo, or connection string even though the DBMigrationsConfiguration has a TargetDatabase property. I would prefer to be able to pass a DBConnection into the initializer class (since I'm using the same method to instantiate my DbContext); however, I should at least be able to pass in a DBConnectionInfo so that I don't have to subclass or use servicelocation just to use my own connection string.

      32 votes
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        1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
      • Built-in entity auditing!

        EF should have some better data change tracking/auditing plumbing...on par with the extensive trace listener class support in ASP.NET. In order to create an audit history of the CRUD actions taking place within my entity model in EF 4.0, I had to write a lot of custom code and override the SavingChanges event and the OnContextCreated method to make it happen. Even now it doesn't properly catch all actions due to certain limitations (such as having DB-set identity fields). Think about how to make auditing data changes simpler and richer for devs!

        31 votes
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          3 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
        • Make it easier to map MEST scenario's between the entities and the poco's

          Summary:
          It's rather confusing and complex trying to map entities (the table/view representations that were added to the EF Designer) to a single POCO.

          Details:
          Currently, if we wish to have a MEST scenario, we need to manually code this mapping in various places. Now, manually coding is not really a big deal .. it's just that there's a number of quirks and tricks that make this process frustrating and a bit confusing.

          It would be extremly appreciated (and more productive) if the mapping of these Entites on the designer, to their POCO, could be done visually IN the designer,…

          31 votes
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            1 comment  ·  Flag idea as inappropriate…  ·  Admin →
          • Synonym Support

            The ability to create an entity for a synonym in the database.

            31 votes
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              3 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
            • Having a real designer...

              It should be great to have a designer which supports all mapping (so which allow us to realize TPC, Horizontal Entity Splitting).
              It should be great to have a designer that supports partial model views as I did (http://msmvps.com/blogs/matthieu/archive/2009/04/07/edm-designer-new-version.aspx, http://msmvps.com/blogs/matthieu/archive/2009/04/11/edm-designer-new-feature.aspx)
              It should be great to be able to see complex types on the designer and not only on Model Browser window as I did (http://msmvps.com/blogs/matthieu/archive/2009/01/07/edm-designer.aspx).
              It should be great to not lose all our ssdl changes when we update the model from db.

              31 votes
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                0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
              • Bulk Insert

                ADO.Net supports bulk insert for big amount of data. With the help of this library
                http://archive.msdn.microsoft.com/LinqEntityDataReader
                It is possible to do Bulk inserts with entities. But it would be nice if there would be a integrated approach.

                30 votes
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                  0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                • Make LINQ to Entities recognize GetValueOrDefault()

                  I have a LINQ query that involves a nullable integer. When I try to run the query, I get the following error:

                  "LINQ to Entities does not recognize the method 'Int32 GetValueOrDefault(Int32)' method, and this method cannot be translated into a store expression."

                  I am not a L2E or EF guru in the least, but it seems like that should translate to the SQL ISNULL function shouldn't it?

                  Regardless, can you please make this functionality work?

                  30 votes
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                    2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                  • Support IEnumerable<T>

                    Sometimes we wish to expose a collection as read only, normally using IEnumerable<T> instead of ICollection<T>. This is not recognized in the current version, but it should.

                    29 votes
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                      2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                    • Delete Collections

                      I think there would be nice idea if you give method to delete collection. Without using foreach statement.

                      Now:
                      foreach(var item in collection)
                      {
                      db.Customers.Remove(item);
                      }
                      db.SaveChanges();

                      and should be simply

                      db.Delete(collection);
                      db.SaveChanges();

                      28 votes
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                        2 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                      • Support for DateTime built-in operations in LINQ to Entities

                        Some customers want to write queries that include such expressions as "date1 - date2" or "datetime3 + timespan1 > datetime4". LINQ to Entities currently support some of date/time operations through the EntityFunctions.AddX and DiffX functions, but it doesn't support built-in operators with data/time types.

                        28 votes
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                          0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                        • Add row_number() support

                          Please add row_number() support. Need it in paging scenarios when we need to find a page to which entity belongs

                          28 votes
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                            1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                          • Make EF IoC Friendly

                            Make EF IoC friendly. It would be nice to have extensions to setup IoC w/ EF.

                            27 votes
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                              3 comments  ·  Flag idea as inappropriate…  ·  Admin →

                              UPDATE: EF7 opens up to external IoC containers through integration with ASP.NET vNext Dependency Injection abstractions.

                              EF6 alpha 1 includes a service locator-based system for plugging in alternate implementations of specific services. See here for a spec: http://entityframework.codeplex.com/wikipage?title=EF%20Configuration%20and%20Extensibility

                              However, materialization is still not extensible in or other mechanism.

                            • Built-in Advanced Cache Policies for queries and result sets

                              Would you guys consider evolving the EF to have Built-in Advanced Cache Policies? For queries and result sets. Keep this data cached in memory, disk, or Azure: appfabric cache, blob storage - based on what you define.

                              26 votes
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                                0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                              • Exclude function as opposed to Include

                                There should be to each Linq to Entities query an extension "Exclude" that returns IEnumerable<TSource> and the excluded fields will not be selected from the store/source.

                                26 votes
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                                  0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                • Converting UpperCase to PascalCase

                                  It would be great if you could add feature for designer to convert uppercase table names to pascal case

                                  23 votes
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                                    0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Partial SaveChanges

                                    Should be able to SaveChanges of certain entities while leaving the other entities in Added etc. mode, this is useful when you want to save data in a page that some other parts of the page contain invalid data that can't be saved.

                                    23 votes
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                                      0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Improve Entity Framework to utilize Dependency Injection for entity materialization

                                      I would like to see EF upgraded to allow a user-selectable Dependency Injection container to manage materialization of entities. This would allow finer grained control over how objects are materialized, as well as support interface based definitions for entities.

                                      23 votes
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                                        0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                      • Support of multilingual entities

                                        Some applications require the ability to maintain data in different languages. In relational databases, a common implementation pattern to achieve this is to use a main table for the corresponding business entity with all persistent properties mapped to table fields, and a language (or localization) table for the language dependent properties of the same business entity. A single instance of a language dependent business entity is therefore represented as a single record in the main table, and multiple records in the language table, depending on the number of supported languages.

                                        It would be great when EF could support this pattern …

                                        22 votes
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                                          0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Test suite for EF provider compliance

                                          There should be a standard EF Test Suite. As the test suite ideally could run against any of the databases, it would ease out the work required to see compliance against different Databases

                                          22 votes
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                                            2 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →

                                            UPDATE: Reverting status from “under review” to “no status” since we aren’t currently working on this. We will still consider it for future releases.

                                            Updating the title to reflect what I believe is the original intent of JK.

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