스프링 데이터 JPA 기초

레포지토리 인터페이스 생성 후 JpaRepository 상속

package com.study.datajpa.repository;

import com.study.datajpa.entity.Member;
import org.springframework.data.jpa.repository.JpaRepository;

public interface MemberRepository extends JpaRepository<Member, Long> {
}

테스트

스프링 데이터 JPA 리턴시 결과는 Optional로 준다.

package com.study.datajpa.repository;

import com.study.datajpa.entity.Member;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.annotation.Rollback;
import org.springframework.transaction.annotation.Transactional;

import java.util.Optional;

import static org.assertj.core.api.Assertions.assertThat;


@SpringBootTest
@Transactional
@Rollback(false)
class MemberRepositoryTest {

    @Autowired
    MemberRepository memberRepository;

    @Test
    public void testMember() {
        Member member = new Member("memberA");
        Member savedMember = memberRepository.save(member);

        Member findMember = memberRepository.findById(savedMember.getId()).get();


        assertThat(findMember.getId()).isEqualTo(member.getId());
        assertThat(findMember.getUsername()).isEqualTo(member.getUsername());
        assertThat(findMember).isEqualTo(member);
    }
}