What is the difference between the Repository Pattern and DAO?

What is the difference between the Repository Pattern and DAO?

The Repository Pattern and DAO (Data Access Object) are both design patterns used to abstract data access, but they serve different purposes. The Repository Pattern focuses on the collection of domain objects and provides a more object-oriented approach, while DAO is more about the data source and provides a lower-level abstraction for data access.

Can you give me an example of when to use each?

Sure! Use the Repository Pattern when you want to work with domain objects and encapsulate the logic for retrieving and storing them. Use DAO when you need to interact directly with a data source, like a database, and want to separate the data access logic from the business logic.

Are there any performance differences between the two?

Yes, there can be performance differences. The Repository Pattern may introduce some overhead due to its abstraction, while DAO can be more efficient for direct data access. However, the choice should depend on the specific use case and the complexity of the application.

Which one is more commonly used in modern applications?

Both patterns are widely used, but the Repository Pattern has gained popularity in modern applications, especially in Domain-Driven Design, due to its focus on domain logic and testability.