By executing the command, we will build our current EF Core project and create our initial migrations. Since migrations are chronological, the prefix is an essential tool for making sense of the changes occurring to our schema. We can see that the Character class has a one to one relationship to both an Actor entity and a Production entity. EF Core uses the naming convention of [Entity]Id to map values to the in-memory object instance. Developers can override EF Core conventions, but I recommend folks starting with EF Core use the default conventions.
Either way, Entity Framework works out how to move from your conceptual model to your database. So, you can query against your conceptual model objects and work directly with them. An entity in Entity Framework is a class that maps to a database table.
What Is Entity Framework And How Entity Framework Core Is Different
EF API will create the Students and Grades tables in the database, as shown below. Before we answer these exciting questions, let’s talk about LINQ, also known as Language-Integrated Query syntax. In particular, we will use the Select method to project or results as anonymous objects. While we could use the types we’ve created in our EntertainmentDbContext, it’s essential to our app’s performance to return results we will use in our code. Like many things in life, the way we use EF Core’s LINQ interface depends on many factors, and developers should consider their use case and develop accordingly. If an entity includes a property of another entity type, it is called a Reference Navigation Property.
Most ORMs typically map the type of the domain directly to the schema of the database. The navigation property represents a relationship to another entity. The following figure illustrates the supported application types, .NET Frameworks and OSs. 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.
Entity Framework using C#
what is entity framework is an open-source ORM (Object Relational Mapping) Framework for the .NET applications supported by Microsoft. It enables the developers to work with the data using the objects of domain-specific classes without focussing on the database tables and columns where the data is stored. With the Entity Framework, developers can work at a higher level of abstraction when developers deal with the data. With the help of Entity Framework, we can create and maintain data-oriented applications with less code when compared with traditional applications.
Entity Framework is an ORM and ORMs are aimed to increase the developer’s productivity by reducing the redundant task of persisting the data used in the applications. An ORM (Object-Relational Mapper) is used to interact with a database using an object-oriented programming language. ORMs allow developers to work with databases using familiar, object-oriented concepts, rather than writing raw SQL statements.
Entity Framework Database First Approach
LINQ provides multiple approaches to pick the top record from a query, with methods like Take, First, and FirstOrDefault. In this example, let’s find the Series with the fewest number of episodes. Entity Framework has come a long way since its original inception. ADO.Net seems to refer directly to the technology for data sets and data tables. There are other ORMs in the marketplace, such as NHibernate and LLBL Gen Pro.
Finally, we used the expressiveness of LINQ to generate SQL queries and return our result set. We store each entity type within the same Productions table, which EF Core manages for us. To test that our data has been seeded, we can use Rider’s built-in SQL query console. 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.
