content: package com.bookstore;
  
  import com.bookstore.service.BookstoreService;
  
  import org.springframework.boot.ApplicationRunner;
  import org.springframework.boot.SpringApplication;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  import org.springframework.context.annotation.Bean;
  
  @SpringBootApplication
  public class MainApplication {
      private final BookstoreService bookstoreService;
  
      public MainApplication(BookstoreService bookstoreService) {
          this.bookstoreService = bookstoreService;
      }
  
      public static void main(String[] args) {
          SpringApplication.run(MainApplication.class, args);
      }
  
      @Bean
      public ApplicationRunner init() {
          return args -> {
              bookstoreService.persistAuthors();
              // bookstoreService.deleteAuthorsViaDeleteAllInBatch();
              // bookstoreService.deleteAuthorsViaDeleteInBatch();
              bookstoreService.deleteAuthorsViaDeleteInBulk();
              // bookstoreService.deleteAuthorsViaDeleteAll();
              // bookstoreService.deleteAuthorsViaDelete();
          };
      }
  }