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. Then provide a meaningful name for the connection string that is going to save in the web.config file. Here, I am naming the connection string as EmployeeDBContext and then click on the Next button as shown in the below image.
This folder contains some auto generated files like Index, Create, Delete etc. At the end, you have an MVC app that can consume a database directly through entity framework. Once you click on the Next button, it will open a popup asking you to choose the Entity Framework version as shown below. From this window, select Entity Framework 6.x and click on the Next button as shown in the below image. Once the database is ready, in the next step, create a new “Console Application” with the name EFDemo as shown in the below image.
Step 1: Create an ASP.NET Core MVC application
Extending DbContext permits to define database model with DbSet (specific Set mapped to a table or more), create a database, query a database… I would first say that the DbContext class relates to Entity Framework (EF), but then the question tags would suggest you figured that much out yourself. In typical usage, deriving from the DbContext class is simply the way to incorporate EF-based data access into your application. The class that derives from DbContext is, in essence, the data access layer of your application. First, we will create a project then adding models to it.
As per the above figure, Entity Framework fits between the business entities (domain classes) and the 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. I’m currently working on an ASP.NET web application that uses Entity Framework for database access. The POCOs created by EF are supposed to be used as your model.
What is the purpose of a db context class in asp.net mvc
Now copy and paste the following code in the main method of the program class as shown below. Here, in this article, I am not going to explain the code. From our next article onwards, I am going to explain everything in detail. Now, run the application and you will get the output as expected as shown in the below image. Save the file first and run both the commands now from the package manager console. In code, you might want to work with objects in an object oriented fashion.
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. Actually, this is a Time-Consuming, and Error-Prone Process.
thoughts on “Entity Framework in ASP.NET MVC”
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 modify the default route in the RouteConfig class so that when the application runs for the first time it will redirect to the Index Action method of Employee Controller. 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.
We use a local Microsft SQL server, and the sample database pubs and its table stores as our database sample. We try to reverse engineer to get the table Stores into the project and make an entity model Store. 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. Change the Model Namespace to “EmployeeModel” and click on the “Finish” button as shown in the below image. But Entity Framework can do all of the above automatically for us if we provide the necessary database schema to the Entity Framework.
- From our next article onwards, I am going to explain everything in detail.
- As per the above figure, Entity Framework fits between the business entities (domain classes) and the database.
- We need to give a name that is RecordContext.cs to the class.
- I will give a brief introduction about Entity framework and how to implement entity framework in MVC.
- As I’ve stated before, you can easily use entity framework as the M part of mvc if you need to interact with a database.
So for this right click our solution explorer and go add and select data in left panel and then select ADO.Net Entity Data Model. This is the base class responsible for managing database connections and provides all sorts of DB related functionality like data access methods to interact with Database. You can think of DbContext as the database what is entity framework connection and a set of tables, and DbSet as a representation of the tables themselves. The DbContext allows you to link your model properties (presumably using the Entity Framework) to your database with a connection string. Once you click on the OK button, you will be back on to the “Choose Your Data Connection” window as shown below.
Entity Framework has a more granular mapping layer so you can customize mappings, for example, by mapping the single entity to multiple database tables or even multiple entities to a single table. A Controller send’s orders to the model to refresh it’s anything but., a particular archive). The controller additionally sends commands to its related view to change the view’s show (For instance scrolling a particular document).