 Spring Boot, WEB MVC, Spring Data JPA, Maria DB를 이용하여 간단히 예제를 만들어 보자. 프로젝트 생성 마리아DB 설치는 아래 URL 참조 http://ojc.asia/bbs/board.php?bo_table=LecSpring&wr_id=524 STS에서 File -> New Project -> Spring Starter Project Name : springjpaexam Type : MAVEN Package : jpa 다음화면에서 SQL -> JPA, MySQL, WEB -> Web 선택

1. Spring Data JPA Simple
Example
탑크리에듀교육센터

2. Persistence Context
Spring Boot, WEB MVC, Spring Data JPA, Maria DB를 이용하여 간단히 예제를 만들어
보자.
프로젝트 생성
마리아DB 설치는 아래 URL 참조
http://ojc.asia/bbs/board.php?bo_table=LecSpring&wr_id=524
STS에서 File -> New Project -> Spring Starter Project
Name : springjpaexam
Type : MAVEN
Package : jpa
다음화면에서 SQL -> JPA, MySQL, WEB -> Web 선택

3. Persistence Context
src/main/resources/application.properties
spring.datasource.platform=mysql
spring.datasource.sql-script-encoding=UTF-8
spring.datasource.url=jdbc:mysql://localhost/jpa_emp?createDatabaseIfNotExist=true
spring.datasource.username=root
spring.datasource.password=1111
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.show-sql=true
#엔티티 클래스를 기반으로 테이블을 자동갱신/생성 하도록
spring.jpa.hibernate.ddl-auto=update
logging.level.jpa=DEBUG

4. Persistence Context
도메인 클래스(Emp.java) – 테이블구조와 동일하다.
package jpa.domain;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
@Entity
public class Emp {
@Id
@GeneratedValue
private Integer empno;
private String ename;
public Emp() {}
public Emp(String ename) { this.ename = ename; }
public Integer getEmpno() { return empno; }
public void setEmpno(Integer empno) { this.empno = empno; }
public String getEname() { return ename; }
public void setEname(String ename) { this.ename = ename; }

5. Persistence Context
레포지토리 클래스(EmpRepository.java)
package jpa.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import jpa.domain.Emp;
//JpaRepository를 상속받으며 매개변수로 도메인클래스와 키타입을 기술한다.
public interface EmpRepository extends JpaRepository<Emp, Integer> {
}
서비스 인터페이스 및 구현클래스(EmpService.java, EmpServiceImpl.java)
package jpa.service;
import java.util.List;
import jpa.domain.Emp;
public interface EmpService {
Emp save(Emp e);
void delete(Integer empno);
Emp getEmp(Integer empno);
List<Emp> getAllEmp();
}
}

6. package jpa.service;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import jpa.domain.Emp;
import jpa.repository.EmpRepository;
@Service
public class EmpServiceImpl implements EmpService {
@Autowired
EmpRepository empRepository;
public Emp save(Emp e) {
return empRepository.save(e);
}
public void delete(Integer empno) {
empRepository.delete(empno);
}
public Emp getEmp(Integer empno) {
return empRepository.findOne(empno);
}
public List<Emp> getAllEmp() {
return empRepository.findAll();
}
}
Persistence Context

7. 컨트롤러 클래스(EmpController.java)
package jpa.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import jpa.domain.Emp;
import jpa.service.EmpService;
@RestController
@RequestMapping("/emp")
public class EmpController {
@Autowired
EmpService empService;
// http://localhost:8080/emp/get/2
@RequestMapping(value = "/get/{empno}", method = RequestMethod.GET)
public Emp get(@PathVariable Integer empno) {
return empService.getEmp(empno);
}
Persistence Context

8. // http://localhost:8080/emp/save.do?ename=홍길동
@RequestMapping(value = "/save", method = RequestMethod.GET)
public Emp add(Emp emp) {
return empService.save(emp);
}
// http://localhost:8080/emp/save/새길동
@RequestMapping(value = "/save/{ename}", method = RequestMethod.GET)
public Emp add2(@PathVariable String ename) {
return empService.save(new Emp(ename));
}
// http://localhost:8080/emp/delete/2
@RequestMapping(value = "/delete/{empno}", method = RequestMethod.GET)
public void delete(@PathVariable Integer empno) {
empService.delete(empno);
}
// http://localhost:8080/emp/getall.do
@RequestMapping(value = "/getall", method = RequestMethod.GET)
public List<Emp> getAll() {
return empService.getAllEmp();
}
Persistence Context

9. 스프링 부트 메인 클래스(SpringJpaExamApplication.java)
package jpa;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import jpa.domain.Emp;
import jpa.service.EmpService;
@SpringBootApplication
public class SpringjpaexamApplication implements CommandLineRunner {
public static void main(String[] args) {
SpringApplication.run(SpringjpaexamApplication.class, args);
}
@Autowired
EmpService empService;
// 초기 데이터 생성
public void run(String...args) {
empService.save(new Emp("가길동"));
empService.save(new Emp("나길동"));
empService.save(new Emp("다길동"));
Persistence Context
@Autowired
EmpService empService;