Have you used the repository pattern in your projects?

Yes, the repository pattern is often used to abstract data access and simplify working with the database. It encapsulates the logic for retrieving and saving data, providing a clean interface for business logic.

Example of using the repository pattern in Java:

public interface UserRepository {
    User findById(Long id);
    void save(User user);
    void delete(User user);
}

public class UserRepositoryImpl implements UserRepository {
    // Here you can use EntityManager or JdbcTemplate
    public User findById(Long id) {
        // implementation for finding a user
    }
    public void save(User user) {
        // implementation for saving a user
    }
    public void delete(User user) {
        // implementation for deleting a user
    }
}

This approach makes testing and maintaining the code easier, as the business logic does not depend directly on the specific data storage technology.