Spring data repositories - parameter what to retrieve all records?

Question

@Repository
public interface UserDao extends User {
   public List<User> findByFirstname(String firstname);
}

How could I use above code to retrieve all records? I tried findByFistname(null);, it doesn't work... I don't want to use findByFirstname(); because it's possible to have parameter.

Hope you all understand.

Answer 1

You should extend your repository from JpaRepository. Be careful with name of repository (It should follow convention). After you inject your UserRepository bean you will have already implemeted by spring data crud methods like findOne(), findAll(), delete() etc.

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
   //assume your primary key is Long type
}

Also will be useful documentation