![]() You might also want to change a few lines of code in the application, but that would be minimal. In that case, you would need to change your data access code – update the repository classes. It helps you to adhere to the Don't Repeat Yourself (DRY) principle since you don't need to repeat the code for performing CRUD operations. You might (though, rarely) also need to change the database type altogether (from Oracle to SQL Server, PostgreSQL, etc.).īy leveraging the Repository Pattern, you can build and test the data access logic and the business logic of an application separately. You can create a corresponding entity class in your application and write a few lines of data mapping code. You can change the data access code without impacting the work of the application works.Īssume that you introduce new database objects (tables, stored procedures, etc.). It also helps in unit testing the application's code since the business logic code is abstracted from the data access logic. This isolation enables the developers to focus on the business logic components rather than write boilerplate code to perform CRUD operations against databases. In other words, a repository abstracts the data storage and retrieval mechanism from the application. With the Repository design pattern applied, the business logic layer of the application does not need to understand how data persistence works beneath the surface. When used correctly, it improves testability, code extensibility, and maintenance. But why is Repository Pattern so essential?Ī repository, in essence, acts as a bridge between your application's domain and data mapping layers. ![]() Now, it is the design pattern of choice for abstracting calls from the application to the underlying database. It was first introduced as part of Domain-Driven Design in 2004. What is a Repository Pattern and Why We Should Care?Ī Repository Pattern is a design pattern used to decouple the application's business logic and data access layers. Entity Developer offers a fully functional 30-days Free Trial which we’ll use in our scenarios. The Community Edition of Visual Studio 2019 and the Developer Edition of SQL Server 2019 are free editions. ![]()
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