Here, I am naming the connection string as EmployeeDBContext and then click on the Next button as shown in the below image. Provide the necessary details to communicate with the database such as Server name, select the Authentication Type, select the Database and click on the Ok button as shown below. This Entity Framework Course is designed for Students, Beginners, Intermediates, and Professionals Developers who want to learn Entity Frameworks step by step, from the basics to the advanced concepts.
Then paste the following code in the Index,cshtml file. Here I am going to use Entity Framework 6.x, so I am selecting the Entity Framework 6.x radio button and click on the Next button as shown in the below image. Let us understand how to use Entity Framework in ASP.NET MVC Application step by step. Although they’re different things entirely they are compatible.
Entity Framework Tutorials using C#
Internally, these E-SQL queries are converted to SQL queries that are data store dependent. E-SQL queries are converted to datastore-specific query languages like T-SQL via the Entity Framework (Transact SQL). Employee004 has been added and able to see in GET request. We have implemented Entity Framework and working well with basic needs.
We used to open a connection to the database, create a DataSet to fetch or submit the data to the database, convert data from the DataSet to .NET objects or vice-versa to apply business rules. Microsoft has provided a framework called “Entity Framework” to automate all these database related activities for your application. Before .NET Framework 3.5, as a developer, we often wrote 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. Then, we create DataSet or DataTables to store the data in memory and perform different types of operations on the data as per the business requirements.
ASP.NET Core Online Training Program
In the Code-First Approach, the EF Core creates the database and tables using Code-First Migration based on the default conventions and configuration. You can also change the default conventions used to create the database and its related tables. This approach is useful in Domain-Driven Design (DDD), i.e., creating the database tables based on the Domain classes. Then, based on the application domain classes and DBContext class, the EF Core creates the database and related tables. For a better understanding, please have a look at the following diagram. Entity Framework (EF) is an object-relational mapper for .NET developers that allows them to work with relational data using domain-specific objects.
The C# Entity Framework is a set of ADO.NET technologies that aid in developing data-driven software. C# Entity framework is an Object Relational Mapping (ORM) framework that gives developers an automated way to store and access databases. The Entity Framework allows developers to work with data at a higher level of abstraction. Entity Framework allows you to develop and maintain data-oriented apps with less code than traditional applications. The C# Entity framework will be explained in this article.
EF 6 Version History
It creates the model and codes from the database in the project and connects them with the database and developer. ASP.NET Web API is a framework that helps to build HTTP(s) services that connect to a wider range of clients, including browsers and mobile devices. ASP.NET Web API is an ideal platform for building RESTful applications.
It points to a single entity but represents the multiplicity of one. Queries against the object model are written entity framework meaning using the LINQ-to-Entities (L2E) query language. The entities defined in the conceptual model are returned.
Introduction to Entity Framework Core
EF Core continues to support the following features and concepts, same as EF 6. To take full advantage of this Entity Framework Core Tutorials, you should have the basic knowledge of C# and any database such as SQL Server, Oracle, or MySQL to gain more knowledge of these tutorials. Having .NET Core, Visual Studio, and SQL Server installed on your computer is good. Let us first see the example without using Entity Framework and then we will see the same example using Entity Framework. In the below example, we are using ADO.NET to interact with the database to fetch the data and display it in the console. Right-click on the Index Action Method and click on Add View.
Let’s perform POST action to add a new employee record. Let’s perform the GET action to retrieve all employee records. 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.
It eliminates the majority of the data-access code that developers must routinely write. The term ORM stands for Object-Relational Mapper, and it automatically creates classes based on database tables and vice versa is also true. It can also generate the necessary SQL to create the database based on the classes.
- Run the following command in the Package Manager console.
- It was released along with .NET Core and is an Extensible, Lightweight, Open Source, and Cross-Platform Version of Entity Framework data access technology.
- Here, you can observe we have created the connection object, created the data adapter object, and created Dataset, Data Tables, and DataView objects.
- As per the above figure, Entity Framework fits between the business entities (domain classes) and the database.
As part of this article, we will discuss the following pointers. The Entity Framework Create Employee and Department classes automatically based on the Employees and Departments Tables. Tables are mapped to classes and columns are mapped to class properties. Once you click on the Next button, it will open Choose Your Database Objects as shown below. From the below window, select the “Departments” and “Employees” tables.
It will create the DBContext class for us whose name is the same as the name of the connection string that is EmployeeDBContext. The EmployeeDBContext class derives from the DbContext class and is responsible for establishing a connection to the database. The EmployeeDataModel.Context.cs which is inside EmployeedataModel.Context.tt as sown below. Once you click on the Finish button, let’s see what the things are created by Entity Framework. It will add the reference to the Entity Framework in the reference folder. Once you click on the OK button a new dialog will pop up for selecting project Templates as shown in the below image.
