import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.boot.CommandLineRunner;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.context.annotation.Bean;

​

@SpringBootApplication

public class AccessingDataJpaApplication {

​

  private static final Logger log = LoggerFactory.getLogger(AccessingDataJpaApplication.class);

​

  public static void main(String[] args) {

    SpringApplication.run(AccessingDataJpaApplication.class);

  }

​

  @Bean

  public CommandLineRunner demo(CustomerRepository repository) {

    return (args) -> {

      // save a few customers

      repository.save(new Customer("Jack", "Bauer"));

      repository.save(new Customer("Chloe", "O'Brian"));

      repository.save(new Customer("Kim", "Bauer"));

      repository.save(new Customer("David", "Palmer"));

      repository.save(new Customer("Michelle", "Dessler"));

​

      // fetch all customers

      log.info("Customers found with findAll():");

      log.info("-------------------------------");

      for (Customer customer : repository.findAll()) {

        log.info(customer.toString());

      }

      log.info("");

​

      // fetch an individual customer by ID

      Customer customer = repository.findById(1L);

      log.info("Customer found with findById(1L):");

      log.info("--------------------------------");

      log.info(customer.toString());

      log.info("");

​

      // fetch customers by last name

      log.info("Customer found with findByLastName('Bauer'):");

      log.info("--------------------------------------------");

      repository.findByLastName("Bauer").forEach(bauer -> {

        log.info(bauer.toString());

      });

      // for (Customer bauer : repository.findByLastName("Bauer")) {

      //  log.info(bauer.toString());

      // }

      log.info("");

    };

  }

​

}