E-SQL queries are converted to datastore-specific query languages like T-SQL via the Entity Framework (Transact SQL). Queries against the object model are written using the LINQ-to-Entities (L2E) query language. EF API infers INSERT, UPDATE, and DELETE commands based on the state of entities when the SaveChanges() method is called. The ChangeTrack keeps track of the states of each entity as and when an action is performed.
- Practically speaking and within the realm of CRUD web applications, an entity is simply a class representation of a database table.
- The Entity Framework allows developers to work with data at a higher level of abstraction.
- Here, select the “EF Designer from database” option as we are going to use the Entity Framework Database First Approach.
- The version 4.3.1 was released on February 29, 2012.[10] There were a few updates, like support for migration.
- Finally, when the data is retrieved, we have to create objects of Employee and Department to populate them with recovered data.
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. But Entity 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.
Referencing Entity Framework into projects
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. Most of the time you don’t have to write any SQL yourself, and iterating is very easy using your language built in functions. When you make any changes to the object, the ORM will usually detect this, and mark the object as ‘modified’. When you save all the changes in your ORM to the database, the ORM will automatically generate insert/update/delete statements, based on what you did with the objects. In a large number of C# web projects, if you deal with databases, your project would likely have a folder called “entities” and it would include classes called entities, just like the examples shown above.
Proceeding further, you will see the comparison between EF6 and EF Core. In order to take full advantage of this Entity Framework Course, you should have the basic knowledge of C# as well as any database such as SQL Server, Oracle, or MySQL to gain more knowledge of these tutorials. Having .NET Framework, Visual Studio, and SQL Server installed on your computer is good. In the year 2008, Microsoft introduced Entity Framework as part of .NET Framework 3.5. Currently, two latest versions of Entity Framework are available one is EF 6 (works with .NET Framework), and another is EF Core (works with .NET or .NET Core). ORMs Tools are used to increase the developer’s productivity by reducing the redundant task of doing CRUD operations against a database in a .NET Application.
What is Entity Framework? Why we use it?
The above figure represents how an entity framework interacts with the domain class and database. It provides a connection between the business entity and data tables in the what is entity framework database. It saves data stored in the properties of business entities and also retrieves data from the database and converts it to business entities objects automatically.
That means the Entity Framework eliminates the need for writing the data-access code that developers usually need to write. Furthermore, it depicts that the Entity Framework minimizes the codes of data accessing that the developers usually write. The above diagram shows that the Entity Framework fits between the Data Layer and the database. It saves the data in the database which are stored in the properties of the business entities (domain classes) and also retrieves the data from the database and converts it to business entities objects automatically. As per the above figure, Entity Framework fits between the business entities (domain classes) and the database. In this article, I am going to give you a brief introduction to the Entity Framework.
What Is the Use of Entity Framework in C#?
From this window, select Entity Framework 6.x and click on the Next button as shown in the below image. When an entity has the property of generic collection type, it is known as collective navigation https://deveducation.com/ property. In code, you might want to work with objects in an object oriented fashion. The version 4.3.1 was released on February 29, 2012.[10] There were a few updates, like support for migration.
In this scenario, the same context class is used to retrieve and save entities. EF API can map each entity to tables and each property of an entity to a column in the database. This approach is an alternative for the code-first approach and the model-first approach. It creates the model and codes from the database in the project and connects them with the database and developer.
Entity Framework will execute the relevant query in the database and then materialize results into instances of your domain objects for you to work within your app. 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.
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