JDBC and R2DBC differences in "getAllRows"

GetBook.java

  
  // JDBC 
  @GetMapping(produces = MediaType.APPLICATION_JSON_VALUE)
  public ResponseEntity<List<BookDTO>> getAll() {
      UUID uuid = UUID.randomUUID();
      log.info("getAll() {} running", uuid);

      ResponseEntity<List<BookDTO>> list = ResponseEntity.ok(
          this.bookRepository.findAll().stream().
              map(mapper::toDto).collect(Collectors.toList()));

      log.info("getAll() {} executed", uuid);
      return list;
  }
  
  // R2DBC
  @GetMapping(produces = MediaType.APPLICATION_JSON_VALUE)
  public Flux<BookDTO> getAll() {
      return Flux.just(UUID.randomUUID()).flatMap(uuid -> {
          log.info("getAll() {} running", uuid);
          return this.bookRepository.findAll().
                  map(mapper::toDto).doFinally((a) -> {
                      log.info("getAll() {} executed", uuid);
                  });
      });
  }
  

Code snippet Related to medium article:

https://blog.devgenius.io/an-epic-tale-comparing-jdbc-and-r2dbc-in-a-real-world-scenario-part-2-2-d908df49651c#823f-8a39553a5cf4