![]() this means that you can use "plain-old" clr objects (poco), such as existing domain objects, with your data model. The entity framework enables you to use custom data classes together with your data model without making any modifications to the data classes themselves. this approach enables us to write plain-old" clr objects (pocos) for our models and it helps in making changes to the persistence layer without impacting the models. in this approach, we do not use entity designer (.edmx). as the name implies, the classes are created first and then database is generated from the classes to fulfill the business needs. ![]() This approach is basically an opposite of data-driven approach and the focus is entities and models which is why it is known as “entity framework code first approach”. these models encapsulate complex business logic, closing the gap between business reality and code. properly applied it can lead to software abstractions called domain models. ![]() On the other hand, many developers are shifting towards the alternative way of developing (and designing) applications by using domain centric approach (domain-driven design).ĭdd is a collection of principles and patterns that help developers craft elegant object systems. in this approach, the entity framework is created from an existing database. many developers still follow this approach and the approach is commonly known as “entity framework database first approach”. hence, the traditional approach in most cases is always about building the application based on the database schema. before we dive deep into the details of code-first approach, we should understand the transference in a way the modern applications are being developed.Ĭonventionally, we have been developing data centric applications where the focus is what data is needed to justify our business needs. in other words, it allows developers to access and store data in the database via an automated mechanism. Let us now retrieve all the students from the database by writing the following code in program.cs file.Entity framework (ef) is an object relational mapper (orm) that enables developers to work with relational data using domain-specific objects. You will see that Entity model and POCO classes are generated from the database. Step 8 − Select all the tables Views and stored procedure you want to include and click Finish. Step 7 − Choose Entity Framework 6.x and click Next. Step 6 − Select the existing database and click Next. Step 5 − Select EF Designer from database and click Next button. Step 4 − Click Add button which will launch the Entity Data Model Wizard dialog. Step 3 − Select ADO.NET Entity Data Model from middle pane and enter name DatabaseFirstModel in the Name field. Step 2 − To create the model, first right-click on your console project in solution explorer and select Add → New Items… Step 1 − Let’s create a new console project with DatabaseFirstDemo name. We already have a database which contains 3 tables as shown in the following image. We use all other functionalities, such as the model/database sync and the code generation, in the same way we used them in the Model First approach. The Database First Approach creates the entity framework from an existing database. It creates model codes (classes, properties, DbContext etc.) from the database in the project and those classes become the link between the database and controller. The Database First Approach provides an alternative to the Code First and Model First approaches to the Entity Data Model. In this chapter, let us learn about creating an entity data model with Database First approach.
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