Acasă » IT Education » Entity Framework Overview

Entity Framework Overview

We should have some additional files in our project under the Migrations folder. These files are source control friendly, allowing multiple individuals to work on the EntertainmentDbContext without fear of irreparable conflicts or lost work. Since the dotnet-ef CLI tool generates and manages these files, we should resist the urge to modify these files via the IDE. Every EF Core solution will have at least one DbContext implementation. An ORM framework does this object to SQL mapping by generating SQL statements and the Entity manager will execute them when you need to save or load objects from the database. It comes at the cost of another abstraction layer, but it will make the code easier to write.

  • The above diagram shows that the Entity Framework fits between the Data Layer and the database.
  • Entity Framework is an open-source object-relational mapper framework for .NET applications supported by Microsoft.
  • Microsoft has provided a framework called „Entity Framework” to automate all these database related activities for your application.

However, it can also be used with standard .NET 4.5+ framework based applications. Unlike the previous query, this example only uses the Rating entity, which results in the following SQL. We can see that EF Core applies a sub-query to retrieve the average rating value advantages of entity framework of a Production. Additionally, it uses an additional sub-query to order our results. The first approach is to use the DbSet on our EntertainmentDbContext class. The discriminator is an important mechanism that we’ll see used later in this post’s query section.

Entity Framework What is Entity Framework Discover the Basic About EF6

Please use the below SQL script to create the database EF_Demo_DB, and tables Departments and Employees, and populate the tables with sample data. Let’s understand what entity framework can do for us with an example. Assume we have the following 2 tables (Departments and Employees). Entity Framework (EF) is an open source[2] object–relational mapping (ORM) framework for ADO.NET. It was originally shipped as an integral part of .NET Framework, however starting with Entity Framework version 6.0 it has been delivered separately from the .NET Framework.

what is entity framework

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. Entity Framework Core is the new version of Entity Framework after EF 6.x. It is open-source, lightweight, extensible and a cross-platform version of Entity Framework data access technology. We store each entity type within the same Productions table, which EF Core manages for us.

EF Basics

EF Core allows you to define Relationships such as one-to-many, many-to-many, and one-to-one between entities. In Entity Framework Core, models are C# classes that represent the data you will be working with. With the project created and EF Core integrated, you’re prepared to start developing your application’s core functionality. For a Cross-Platform Development experience, ensure that the tools and databases you choose are compatible with all operating systems you plan to support.

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. In this article, I am going to give you a brief introduction to the Entity Framework. Before .NET 3.5 as a developer, we often used to write ADO.NET code to perform CRUD operations with the underlying database. For this, we need to create a Connection Object with the database, then Open the Connection, Create the Command Object and execute the Command using Data Reader or Data Adapter. And then we create DataSet or DataTables to store the data in memory to perform different types of Operations on the Data as per the business requirements.

By utilizing these advanced features and best practices, developers can create robust, maintainable applications. Interceptors give you the ability to intercept database operations like commands, transactions, or connection openings. The AppDbContext class above declares DbSet Properties for Product and Category, which correspond to tables in the database. The DbContext in Entity Framework Core acts as a session with the database, allowing for querying and saving instances of your entities. The Fluent API provides more control over the EF model configuration, allowing for precise mapping of relationships.

what is entity framework

Lasă un comentariu

Adresa ta de email nu va fi publicată. Câmpurile obligatorii sunt marcate cu *