When was entity framework released

In Entity Entity Framework gives developers the ability to be abstracted from the underlying relational database management system and allows them to talk to a database using familiar LINQ-based syntax.

Rod takes a look at how to evaluate the winners and losers when it comes to new technologies. Entity Framework 4. The Entity Framework team at Microsoft has been making several improvements since the launch of v4 with Visual Studio.

The biggest of these is the capability to use a Code First or Code Only development model. Previously, if you wanted to work with the Entity Framework, you had to use either a Database First or Model First development model. Entity Framework Core 2. With this release, EF Core has really matured.

Julie takes you on a tour and points out some of the highlights of this labor-simplifying tool. Entity Framework Core 3. The latest release of Entity Framework gets it geared up for some big future changes. Julie shows you that the changes are nothing to sneeze at. Heard on. NET Rocks! Pablo Castro on Astoria. Introducing ADO. The challenge of bringing data from efficient storage engines such as SQL Server into object-oriented programming models is hardly a new one.

Showing the top 5 NuGet packages that depend on EntityFramework:. If you use these providers to develop your application, the application will be ready for cloud environments like Azure. Other than supporting additional storage options, the providers work like the existing SQL-based providers, so that you can easily switch an application to use cloud storage via SQL Azure.

Effort is basicly an ADO. NET provider that executes all the data operations on a lightweight in-process main memory database instead of a traditional external database.

It provides some intuitive helper methods too that make really easy to use this provider with existing ObjectContext or DbContext classes. A simple addition to existing code might be enough to create data driven unit tests that can be run without the presence of the external database.

NET objects or vice-versa to apply business rules. This was a cumbersome and error prone process. Microsoft has provided a framework called "Entity Framework" to automate all these database related activities for your application. Entity Framework is an open-source ORM framework for. NET applications supported by Microsoft. It enables developers to work with data using objects of domain specific classes without focusing on the underlying database tables and columns where this data is stored.

Build succeeded. Additionally, we can ask Rider to diagram our database tables, showing the relationships that we modeled during the code-first design phase of this tutorial. One of our favorite features is database introspection , which suggest SQL joins according to the current schema in the dialect of the target database engine. This section will explore common queries we will write when dealing with our domain. In particular, we will use the Select method to project or results as anonymous objects.

We talked about how both a Movie and a Series is a Production. We store each entity type within the same Productions table, which EF Core manages for us. We can access the Movie types in one of two ways.

WorldwideBoxOfficeGross ;. We can also use the OfType method after accessing the Productions property to narrow down to a particular hierarchical subset. In our case, we want Movies. We can see that EF Core utilized the Discriminator column, even though there is no explicit mention of it in our database model.

Aggregation is one of the most important reasons to use a relational database, and with LINQ, using an aggregate function like Sum , Average , and Max is straightforward.

As we can see, we utilize the navigation property of Ratings to determine the average of the star values. What does this translate to in SQL? We can see that EF Core applies a sub-query to retrieve the average rating value of a Production. Additionally, it uses an additional sub-query to order our results. EF Core users who want to write the query starting with the Ratings property cannot currently do so due to some EF Core query generator limitations.

The EF team is still actively working through querying scenarios and are trying to resolve some of these issues. As mentioned in the previous section, aggregations are essential for providing summary data. Count ;. Unlike the previous query, this example only uses the Rating entity, which results in the following SQL.

Name, x.