Since Alpha 2 the majority of our work has been around adding or improving the core components of the EF7 code base and improving test coverage.
These release notes only list the more prominent changes/improvements/additions that affect the functionality available to developers using EF7.
Please bear in mind that this preview is designed to give you an idea of what the experience in EF7 will be like and you will quickly hit limitations if you deviate from any sample code and/or try to use advanced features. The API surface will also change significantly in future previews.
Providers
In Alpha 3 we made progress on our various database providers:
- EntityFramework.SqlServer - More query operators are now processed in the data base. We also made general improvements to the DDL Pipeline and the Update Pipeline.
- EntityFramework.SQLite - We brought the Query Pipeline, Update Pipeline and DDL Pipeline up to a similar quality level as the SQL Server provider.
- EntityFramework.AzureTableStorage - This provider was checked into our main code base and can now be used to target Azure Table Storage. Basic query processing is implemented so that filters on row and partition key are processed in the database. The Update and DDL pipelines also have basic functionality implemented.
- EntityFramework.InMemory - We didn't make any significant changes to this provider. It has basic functionality implemented and is useful for testing scenarios etc.
Definition of Provider Terms
Query Pipeline: The component that translates a LINQ query into a store specific query and then passes results back to EF.
Update Pipeline: The component that translates information from the ChangeTracker into store specific update commands (i.e. INSERT/UPDATE/DELETE on a relational database).
DDL Pipeline: The component that creates schema objects in the database (i.e. Tables, Columns, etc. in a relational database).
Relationship Fix-up / Change Detection
We implemented more of the functionality that detects changes to the values stored in the properties of your objects. This also includes automatically 'fixing up' the values stored in navigation and foreign-key properties when EF detects that one of them has changed.
Migrations
We enabled the migrations commands for non-ASP.NET vNext applications. If you install the EntityFramework.Design NuGet package, the Add-Migration and Update-Database commands will be available in Package Manager Console. Note that the Enable-Migrations command is no longer required or available.