패스트캠퍼스 챌린지 19일차

Part 1. Spring Framework

 Ch 03. 예제를 만들며 이해하는 스프링 웹 어플리케이션 핵심 기술

  05. H2 DB 설명, 간단한 DB 저장 기능 구현

   H2 DB 

   - relational DB (mySQL, Oracle는 직접 설치해야함, H2 DB는 설치가 필요 없음)

   - memory DB로 많이 사용 (간단하고 편리하게 사용가능)

   - build.grale()에 iruntimeOnly "'com.h2database:h2'"를 통해

     api를 실행 시 db가 생성되었다가 api종료 시 데이터가 삭제됨

 

spring:
  h2:
    console:
      enabled: true

<application.yml>

<localhost:8080/h2-console>

 

package com.fastcampus.programmin.dmaker.controller;

import com.fastcampus.programmin.dmaker.service.dMakerService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.Arrays;
import java.util.List;

@Slf4j
@RestController //사용자의 요청을 받아 json 형태로 응답을 반환 //ctrl + 클릭
@RequiredArgsConstructor

// DMakerController(Bean)   DMakerService(Bean)   DeveloperRepository(Bean)
//===========================Spring Application =============================
//
//


public class DMakerController {
    private final dMakerService dMakerService;

    @GetMapping("/developers") //사용자 요청이 /developers를 통해 들어온다면 (ex] GET /developers HTTP/1.1)
    //
    public List<String> getAllDevelopers(){
     // GET /Developers HTTP/1.1
     log.info("GET /developers HTTP/1.1");

     return Arrays.asList("snow", "elsa", "Olaf");
    }

    @GetMapping("/create-developer")

    public List<String> createDevelopers() {
        log.info("GET /create-developer HTTP/1.1");

        dMakerService.createDeveloper();

        return Arrays.asList("Olaf");
    }
}

<DMakerController.java>

 

package com.fastcampus.programmin.dmaker.Repository;

import com.fastcampus.programmin.dmaker.entity.Developer;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface DeveloperRepository
        extends JpaRepository<Developer, Long> {

}

<DeveloperRepository.java>

 

package com.fastcampus.programmin.dmaker.service;

import com.fastcampus.programmin.dmaker.Repository.DeveloperRepository;
import com.fastcampus.programmin.dmaker.entity.Developer;
import com.fastcampus.programmin.dmaker.type.DeveloperLevel;
import com.fastcampus.programmin.dmaker.type.DeveloperSkillType;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import javax.transaction.Transactional;


@Service
@RequiredArgsConstructor
public class dMakerService {
    private final DeveloperRepository developerRepository;

    @Transactional
    public void createDeveloper(){
        Developer developer = Developer.builder()
                .developerLevel(DeveloperLevel.JUNIOR)
                .developerSkillType(DeveloperSkillType.FRONT_END)
                .experienceYears(2)
                .name("Olaf")
                .age(5)
                .build();

        developerRepository.save(developer);
    }
}

<dMakerService.java>

 

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