The Repository Pattern in Clean Arch
Implement the Repository pattern to abstract data access, allowing Use Cases to interact with data persistence without knowing its details.
What's the Repository Pattern?
In Clean Architecture, we want our core business logic (Use Cases) to be independent of external details like databases or web frameworks.
The Repository Pattern helps achieve this by abstracting the way data is stored and retrieved. It acts as a mediator between the domain and data mapping layers.
The Problem: Direct Data Access
Imagine your Use Case directly querying a database or calling an ORM (Object-Relational Mapper) like Hibernate or Entity Framework.
- Your Use Case becomes coupled to the database technology.
- Changing the database means changing the Use Case.
- Testing Use Cases requires a live database connection.
This violates the Dependency Rule of Clean Architecture, which states that dependencies should only point inwards.
All lessons in this course
- The Repository Pattern in Clean Arch
- Gateway Interfaces for External Systems
- Data Mappers and DTOs
- Anti-Corruption Layers for Third-Party APIs