스프링 JPA 강좌(Spring Data JPA 간단 예제)

SPRING DATA JPA
SIMPLE EXAMPLE
이종철, 탑크리에듀(topcredu.co.kr)

1. 프로젝트 생성
• Spring Boot, WEB MVC, Spring Data JPA, Maria DB를 이용하여 간단히
예제를 만들어 보겠습니다.
• 마리아DB 설치는 아래 URL 참조하세요
• 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

2. 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=tru
e
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

3. 도메인 모델 클래스(Emp.java)
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; }
}

4. 레토지터리 클래스(EmpRepository.java)
package jpa.repository;
import org.springframework.data.jpa.repository.JpaRepository;
import jpa.domain.Emp;
// JpaRepository 에서 기본적인 CRUD를 제공한다.
// JpaRepository 매개변수로 도메인클래스와 키타입을 기술한다.
public interface EmpRepository
extends JpaRepository<Emp, Integer> {
}

5. 서비스 인터페이스(EmpService.java)
package jpa.service;
import java.util.List;
public interface EmpService {
Emp save(Emp e);
void delete(Integer empno);
Emp getEmp(Integer empno);
List<Emp> getAllEmp();
}

6. 서비스 구현체(EmpServiceImpl.java) - 1
package jpa.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import jpa.repository.EmpRepository;
@Service
public class EmpServiceImpl implements EmpService {
@Autowired
EmpRepository empRepository;
public Emp save(Emp e) {
return empRepository.save(e);
}

6. 서비스 구현체(EmpServiceImpl.java) - 2
public void delete(Integer empno) {
empRepository.delete(empno);
}
public Emp getEmp(Integer empno) {
return empRepository.findOne(empno);
}
public List<Emp> getAllEmp() {
return empRepository.findAll();
}
}

7. 컨트롤러(EmpController.java) - 1
package jpa.controller;
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.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);
}
// 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();
}
}

연습이 대가를 만듭니다.
실무 JAVA, Spring Framework, JPA 교육 전문
탑크리에듀 http://www.topcredu.co.kr

스프링 JPA 강좌(Spring Data JPA 간단 예제)

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