Entity Framework Feature Suggestions

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  1. 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.

    7 votes
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      0 comments  ·  tools  ·  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 →
      • WF / EF integration

        It would be nice if you could somehow link the WF designer with the EF designer so that entities can more easily be integrated with workflows.

        A form designer link would also be beneficial. Define the entities, start with a form generated is a similar way as is done today with ASP.Net Dynamic data but have the ability to make changes to the templates visually. Then allow us link everything together with workflow.

        Have integrated templates for deployment as WPF, Silverlight, ASP.Net and SharePoint 2012 deployments.

        7 votes
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          0 comments  ·  tools  ·  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 →
          • Allow foreign key columns to be shared between a subset of TPH subclasses

            Scenario in the post http://entityframework.codeplex.com/workitem/583 works only for columns that are not foreign keys.

            For example we have BaseEntity and three inherited entities:
            InheritedEntity1.Name
            InheritedEntity2.SpecialStatus
            InheritedEntity3.SpecialStatus

            SpecialStatus is entity stored in separate table.

            BaseEntity table will have columns 'Name', 'SpecialStatus_Id', 'SpecialStatus_Id1'

            Try to change the name of the column:
            modelBuilder.Entity<InheritedEntity2>().HasOptional(p => p.SpecialStatus).WithOptionalDependent().Map(i => i.MapKey("SpecialStatus_Id"))
            modelBuilder.Entity<InheritedEntity3>().HasOptional(p => p.SpecialStatus).WithOptionalDependent().Map(i => i.MapKey("SpecialStatus_Id"))

            and get an ModelValidationException:
            "One or more validation errors were detected during model generation:
            SpecialStatus_Id: Name: Each property name in a type must be unique. Property name 'SpecialStatus_Id' is already defined.
            "

            7 votes
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              0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
            • Persistent caching of auto-compiled queries

              I know that EF code first automatically compiles queries and caches the results. But "Cold" queries are so slow.. Is possible to persist auto-compiled queries somewhere in the database so EF won't need to re-compile them again if that cache is lost (app restarted).

              6 votes
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                0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
              • namespace complex types

                Place complex types generated by the database in their own namespaces. Right now, when a stored procedure is imported, a complex type is generated and placed in no particular namespace, so all of the complex types are floating about.

                Perhaps instead, use the namespace that's been given to the model.

                6 votes
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                  1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                • Improve performance of adding many entities to DbContext (DetectChanges, AutoDetectChangesEnabled)

                  The performance hit of adding (and possibly other operations) many entities to the context is so big, that you've introduced the AutoDetectChangesEnabled switch https://msdn.microsoft.com/en-gb/data/jj556205.aspx. This increases the code complexity and leads to nasty bugs. This is not ok and should be redesigned to work fast out-of-box. E.g. by upgrading from EF5 to EF6, due to this feature, the performance of some code has degraded by many orders of magnitude

                  6 votes
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                    0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                  • Native support for defining filtered unique and/or nonclustered indexes

                    IndexAttribute does not allow me to definite filtered indexes. Instead, I have to execute raw SQL.

                    6 votes
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                      1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                    • Show diagram nodes under the EDMX node in solution explorer

                      At the moment if I want to work on a specific diagram, I have to open the default diagram in the solution explorer, open the model browser, then open the diagram I'm interested in. Can we have diagrams listed as nodes underneath the EDMX nodes in solution explorer, allowing us to go straight to the diagram we are actually interested in?

                      6 votes
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                        1 comment  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                      • 6 votes
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                          1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                        • Support optional complex type

                          For example: Class Foo has a property named Bar and that property is a reference to the complex type ComplexBar. It would be great if Bar could be left null in cases when a "user/whatever" does not have any ComplexBar information. The benefit is that ComplexBar can have required properties and other validation that only applies when the property Bar is not null. If it is null then that validation is not triggered because it does not apply. If I want Bar to always have a value then I can flag it as required, and it will behave like complex…

                          6 votes
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                            0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                          • Allow stored procedures to be used to navigate relationships

                            There are many developers who are in shops that don't allow non-stored procedure calls to SQL Server. It would be really nice if there was something in EF where we could select a relationship in the EF designer, go to its mapping and select a stored procedure for each role in the relationship. It might go something like this:

                            1.We would create a relationship between two entitties, say Author and Book. Both entities would be required to expose foreign keys (the developer can make them private if they want).
                            2.A stored procedure would be created that would navigate from each…

                            6 votes
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                              0 comments  ·  Flag idea as inappropriate…  ·  Admin →
                            • Change schema for dbContext pre connection

                              Build one model from code first and then use new TennantContext(connection, schema).

                              Exactly as HasDefaultSchema but possible to change with new connection.

                              No migrations and no other special features needed.

                              Lets say I have users data stored in one DB but in different schemas (each user has own schema). I have 1000+ of users, every model for every user is cached by IDbModelCacheKeyProvider is RAM kill.

                              P.S. Alter user set default schema is not a solution

                              Thanks

                              6 votes
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                                0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                              • Provide Refactor Into Existing Complex Type

                                In the designer we can Refactor Into New Complex Type, but once we have done this we cannot Refactor all other instances into Existing Complex Type.

                                6 votes
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                                  0 comments  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                                • Custom identity generator support

                                  I'd like to have a custom identity generator support which would allow more advanced ID generation like HiLo-generator (or even sequence based hi/lo ID gneration). This would (for example) help reducing the amount of database accessed/communication which should result in a speed up when adding a batch of new records through EF.

                                  6 votes
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                                    0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                  • create an secondary index from edmx designer tool for generate database

                                    when create a database from model some times need create secondary index for restrict some case of data

                                    6 votes
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                                      1 comment  ·  tools  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Make Data Annotations more flexible to use and to customize

                                      DataAnnotations are only really useful when the rules and the error messages can buble the whole way up to the ui. Some modern ui frameworks already make use of this - e.g. Breeze. But DataAnnotations are just not as flexible as we need them. Some known problems are:

                                      - you can define your own error messages within the DataAnotation - but those are not easy to localize. To my mind the decission about displaying the content error message should be left to the client. As the client could possibly be a web page, a smartphone or even a coffee machine…

                                      6 votes
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                                        1 comment  ·  Flag idea as inappropriate…  ·  Admin →
                                      • Create method should initializer collection navigation properties

                                        I've found that in Code First entities, my "many" properties such as

                                        property List<People> SomePropertyName {get; set;}

                                        are null when the entity is instantiated. This breaks the common "convention" of just simply adding entities to the list:

                                        You can't just
                                        MyEntity.SomeManyProperty.Add(SomeOtherEntityInstance);

                                        You have to do
                                        MyEntity.SomeManyProperty = new List<SomeOtherEntity> { SomeOtherEntityInstance };

                                        but, of course, you can't just do that, because you might wipe out an existing list, if there is one, so you must then do a check first. Ugly.

                                        As a lesser evil, I've resorted to instantiating empty lists in the constructor of my entities but this is…

                                        6 votes
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                                          5 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Optional Convention that assigns Default Value to not nullable types

                                          When using code first with an existing database, the "can not assign null to a non nullable type" exception can be realy painfull, because the compiler gives no warning, when i project a int? to a int.

                                          It would be very usefull to have a Convention / Configuration that enables the automatic use of GetValueOrDefault for these cases.

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