Spring ( JPA 사용2, week02application.java) 정보 업데이트 및 삭제

package com.sparta.week02;

import com.sparta.week02.domain.Course;
import com.sparta.week02.domain.CourseRepository;
import com.sparta.week02.service.CourseService;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;

import java.util.List;

@EnableJpaAuditing //생성일자, 수정일자에 따라서 자동으로 업데이트
@SpringBootApplication
public class Week02Application {

    public static void main(String[] args) {
        SpringApplication.run(Week02Application.class, args);
    }
    @Bean
    public CommandLineRunner demo(CourseRepository courseRepository, CourseService courseService) {
        return (args) -> {
            courseRepository.save(new Course("프론트엔드의 꽃, 리액트", "임민영"));

            System.out.println("데이터 인쇄");
            List<Course> courseList = courseRepository.findAll();
            for (int i=0; i<courseList.size(); i++) {
                Course course = courseList.get(i);
                System.out.println(course.getId());
                System.out.println(course.getTitle());
                System.out.println(course.getTutor());
            }

            Course new_course = new Course("웹개발의 봄, Spring", "임민영");
            courseService.update(1L, new_course); // 업데이트 기능 
            courseList = courseRepository.findAll();
            for (int i=0; i<courseList.size(); i++) {
                Course course = courseList.get(i);
                System.out.println(course.getId());
                System.out.println(course.getTitle());
                System.out.println(course.getTutor());
            }
        };
    }
        };

 업데이트 기능 주석 참고 

package com.sparta.week02;

import com.sparta.week02.domain.Course;
import com.sparta.week02.domain.CourseRepository;
import com.sparta.week02.service.CourseService;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;

import java.util.List;

@EnableJpaAuditing //생성일자, 수정일자에 따라서 자동으로 업데이트
@SpringBootApplication
public class Week02Application {

    public static void main(String[] args) {
        SpringApplication.run(Week02Application.class, args);
    }
    @Bean
    public CommandLineRunner demo(CourseRepository courseRepository, CourseService courseService) {
        return (args) -> {
            courseRepository.save(new Course("프론트엔드의 꽃, 리액트", "임민영"));

            System.out.println("데이터 인쇄");
            List<Course> courseList = courseRepository.findAll();
            for (int i=0; i<courseList.size(); i++) {
                Course course = courseList.get(i);
                System.out.println(course.getId());
                System.out.println(course.getTitle());
                System.out.println(course.getTutor());
            }

            Course new_course = new Course("웹개발의 봄, Spring", "임민영");
            courseService.update(1L, new_course);
            courseList = courseRepository.findAll();
            for (int i=0; i<courseList.size(); i++) {
                Course course = courseList.get(i);
                System.out.println(course.getId());
                System.out.println(course.getTitle());
                System.out.println(course.getTutor());
            }

            courseRepository.deleteAll(); //  정보 삭제 기능 
        };
    }
        };

삭제 기능 주석 참고 (추가만해주면됨)