How to search in a database not by id in Spring Boot?

Question

Java

Good day, dear ones. There is this code:

@GetMapping("/notes/{id}")
    public ResponseEntity<Note> getNoteById(@PathVariable(value = "id") Long id) {
        Note note = noteRepository.findOne(id);
        if(note == null) {
            return ResponseEntity.notFound().build();
        }
        return ResponseEntity.ok().body(note);
    }

The method simply retrieves the entry with the given id from the database.
The noteRepository.findOne(id) method accepts either a Long or class extends org.springframework.data.domain.Example as input.
I want to search for information not by id , but by secretkey (String).
Please tell me how to do it.
Many thanks in advance for your replies!

Answer 1

Create in noteRepository method
Node findBySecretKey(String secretKey);