Entity Framework Feature Suggestions

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Entity Framework Feature Suggestions

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  1. Improved API for Migrations

    The API for DbMigrator is lacking. I would like to see .UpOne(), .DownOne(), .Up(n), .Down(n) methods to attempt to perform that number of migrations.

    .Update("0") is an odd-looking way to completely thrash the DB. Something like .RollbackAll() would be a very simple implementation and have a much clearer name.

    Having .Update() take an additional optional parameter to completely rollback first, and apply all migrations from scratch might be very nice, especially in a test or development environment.

    Generating an SQL script for logging purposes and then performing the DB migration must currently (I believe) be done in two steps. A…

    7 votes
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      1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
    • More descriptive error messge when using non-generated POCO - Mapping and metadata information

      Need more detail as to why EF gives this excpetion "Mapping and metadata information could not be found for EntityType". Usually it is a name mismatch, but with large modesl it can be hard to pinpoint the source of the error.

      7 votes
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        0 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 →
        • Clear all entities in a set.

          Need to be able to call Clear on an EntitySet to delete all entities from that set (i.e. rows from underlying table). When called as myObjectContext.MyCustomers.Clear() it would delete all rows in the underlying table.

          7 votes
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            1 comment  ·  Flag idea as inappropriate…  ·  Admin →
          • Allow inserting new entities with predefined identity column values (INSERT_IDENTITY)

            Especially for migration projects it would be useful to allow entities to be saved with predefined identity values.

            Until now you have to use ADO.NET to do this.
            SET IDENTITY_INSERT TableName ON
            INSERT INTO TableName (IdColumn, Column1)
            VALUES (234, 'Value')

            I would like to tell the DbContext to use this feature when saving new entities.

            7 votes
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              0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
            • Use CTE (with clause) instead of derived tables in generated queries.

              SQL Generated code would be much more readeable if you would use common table expressions instead of derived table. Just choose the name you want for the CTE and move the code generated for the derived table into the CTE, and replace the derived table expression by the name of the CTE. The resulting code is then no more indented. You can also take the opportunity to properly name the CTE to give an hint about which part of the linq expression result in the CTE generation. This improvement should not be complex to implement, and would help us and…

              7 votes
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                0 comments  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
              • Support for multiple result sets in .ExecuteFunction() and .ExecuteQuery()

                public Tuple‹T1, T2› ExecuteQuery‹T1, T2›(string query) { ... }
                public Tuple‹T1, T2, T3› ExecuteQuery‹T1, T2, T3›(string query) { ... }

                7 votes
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                  1 comment  ·  runtime  ·  Flag idea as inappropriate…  ·  Admin →
                • code first support for view

                  allow to define a view by code first.

                  actually we can map an entity to a view but it then becomes nasty to:
                  - generate the database,
                  - migrate the database
                  - evolve the schema in general

                  It should be possible to:
                  - declare a DbSet that does not involve a table creation
                  - declare a view, with a linq query for example, that allows view creation.

                  For DbSet if should be a convention: if table name starts with vvv then it is a view, do not create a table

                  For view creation... no idea actually.

                  7 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 →
                    • 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 →
                        • Query serialization / deserialization

                          ** SUGGESTION **
                          Native support for query serialization and deserialization (to XML) decoupled from a concrete ObjectContext, including query parametrization and correct management of lambda expressions (e.g. using expression expansion as in LinqKit).

                          ** WHY **
                          We've developed a set of classes that allow a query to be written in the client layer and executed in the service layer via web services (with POCO entities). After the query is written normally using linq to entities and obtaining an IQueryable<T> object, this implementation transparently does the following:

                          CLIENT side:
                          - Expands the query expression tree to correctly manage lambda expressions.
                          -…

                          7 votes
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                            0 comments  ·  runtime  ·  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 →
                                • Support json linq queries

                                  As MS is adding json support to Sql Server 2016 it would be great if EF could support this with linq queries and convert a tree with arrays to nested lists.

                                  6 votes
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                                    0 comments  ·  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 →
                                      • Support lazy loading proxies on internal POCO classes

                                        I'd really like to not have all my model classes declared as public. Please support classes declared as internal. Even if there is a requirement to add InternalsVisibleTo("EntityFramework") or similar to the AssemblyInfo that is fine.

                                        6 votes
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                                          0 comments  ·  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 →
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