EF Core supports two development approaches 1) Code-First 2) Database-First. EF Core mainly targets the code-first approach and provides little support for the database-first approach because the visual designer or wizard for DB model is not supported as of EF Core 2.0. Entity Framework Core is the new version of Entity Framework after EF 6.x.
I am trying to connect to a localDb instance of the SQL Server. You can connect to a SQL Server Instance as well, by modifying the connection strings. You can refer here for connection string variants of SQL Server. By definition, we now have the means to interact with Student Entity. I will create a Student Model in the Models folder, and add a bunch of properties to it.
Introduction to the Entity Framework Core
Version 5.0.0 was released on August 11, 2012[11] and is targeted at .NET framework 4.5. Also, this version is available for .Net framework 4, but without any runtime advantages over version 4. EF Core is intended to be used with .NET Core applications. However, it can also be used with standard .NET 4.5+ framework based applications.
- To change this behavior and optimize batch updates, you can take advantage of the UpdateRange() method as shown in the code snippet given below.
- We must specify the appropriate database provider when scaffolding so that the scaffolding can respect the SQL syntax of our database.
- In this article we examined 10 key strategies you can use to improve data access performance in EF Core.
- The following code snippet illustrates how AsNoTracking can be used to disable tracking for an individual query in EF Core.
In this example, we select directly into our HTTP API response models for maximum efficiency. To enable lazy loading, folks have to install the Microsoft.EntityFrameworkCore.Proxies package. We can opt into identity resolution while opting out of object what is entity framework tracking by using the newly added AsNoTrackingWithIdentityResolution method. In the case of this query, an Actor may be in multiple movies. Since EF Core is no longer tracking entities, EF Core will allocate an entity for the same Actor multiple times.
EF Core Overview Discover What is EF Core and Why You Should Use it
It has been designed to be lightweight, and extensible and to support cross-platform development as part of Microsoft’s .NET Core framework. It has also been designed to be simpler to use and to offer performance improvements over previous versions of Entity Framework. This is a very common task as a developer for us that we do almost in every application. The Entity Framework is an Object/Relational Mapping (O/RM) framework that maps objects to relational databases. This framework is an improvement to ADO.NET, which automates the process of accessing and storing data in databases. EF Core is specifically designed for use with .NET Core applications but can also be used with standard .NET applications based on Framework 4.5 or higher.
EF Core supports a much-improved migration model compared to its predecessor, EF 6. The newer EF Core boasts version-control-friendly migration files, CLI tooling, and repeatable workflows. Instead of using anonymous object results, we can also project directly into data transfer objects meant to be consumed by callers.
Saving Data
Now we can use update-database command to generate the database. As we mentioned earlier, Entity Framework Core was born in 2016, but years have passed since then. By this time, we have witnessed several EF Core versions. For your convenience, we have compiled a table with brief information about them. We still need to retrieve the data from the database and map it to our data model.
When using inheritance, we usually define shared properties on base types, but there might be an instance where that’s not the case. Let’s look at an example where two models in our hierarchy share the same property name without inheriting from the base type. The TPH approach uses a single table with columns for each property unique to an entity with a Discriminator column. In the following example, both Movie and Series share a Productions table.
