To add a new entity to the database, create an instance of your model and use the Add method. Defining your models and their relationships correctly is crucial for reflecting the business logic and ensuring the integrity of your data. After setting up your models and DbContext, you can then configure the Dependency https://deveducation.com/ Injection container to use your DbContext with the connection string defined earlier. Entity Framework is an Object-Relational Mapper which enable the .NET developers to work with the database using the .NET objects. It eliminates the need for accessing the code of the data that developers need to write.
For more complex queries, use LINQ to filter, order, and project data as needed. The above example defines a Category model with an ID and a Name, along with a list of Product items. By using LINQ queries, EF Core translates your actions to SQL queries and executes them against the database. This tutorial is designed for those who want to learn how to start the development of the Entity Framework in their application.
EF API will create a column in the database table for each scalar property, as shown below. Entity Framework Core uses a provider model to access many different databases. EF Core includes providers as NuGet packages which you need to install. EF Core supports two development approaches 1) Code-First 2) Database-First.
This list is created based on the most notable features and also from frequently asked questions about Entity Framework. The following figure illustrates the supported application types, .NET Frameworks and OSs. Entity Framework is an Object/Relational Mapping (O/RM) framework. It is an enhancement to ADO.NET that gives developers an automated mechanism for accessing & storing the data in the database. As mentioned in the previous section, aggregations are essential for providing summary data. In this example, we’ll look at the sources of ratings and how many exist in our database.
From the Terminal tool window in JetBrains Rider, let’s run the following command. Each record’s type is distinguished by a Discriminator column, which usually holds a simplified C# type name. The Discriminator column is invisible to developers from C#, but we can see it in the database schema generated by EF Core 5. But Entity advantages of entity framework Framework can do all of the above automatically for us if we provide the necessary database schema to the Entity Framework. Let us understand this step by step how to achieve the same using Entity Framework. EF API infers INSERT, UPDATE, and DELETE commands based on the state of entities when the SaveChanges() method is called.
Once you click on the OK button, you will be back on to the “Choose Your Data Connection” window as shown below. Entity Framework Core has trade-offs of performance overhead and increased memory usage compared to more tedious approaches like ADO.NET. Most developers are willing to make those trade-offs for increased developer productivity, a high-level database access abstraction, and unit testing options. After some tries, I realized that if I add a .ToList() at the end of the query and after convert it using .AsQueryable() to pass as an argument to the mapper, the .Where clause works fine. I can’t use .ToList() because it select all the properties of the classes that I am querying. Make sure the DefaultConnection string in appsettings.json is correct and the database server is accessible.
It provides a high-level abstraction over relational databases, allowing developers to work with data as strongly typed objects. Dive into the robust capabilities of ASP.NET Core with its integrated Entity Framework, a duo that streamlines the development of data-driven web applications. This pairing offers a streamlined approach to object-relational mapping, simplifying how you interact with databases. As per the above figure, Entity Framework fits between the business entities (Domain Classes) and the database. It saves the data in the business properties entities and also retrieves the data from the database and converts it into the business entity’s object automatically. If an entity includes a property of another entity type, it is called a Reference Navigation Property.