<aside> 💡 PersistContext 영속성 컨텍스트 이해

</aside>

1. BoardPersistRepository save 만들기

package shop.mtcoding.blog.board;

import jakarta.persistence.EntityManager;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

@RequiredArgsConstructor
@Repository
public class BoardPersistRepository {
    private final EntityManager em;

    @Transactional
    public Board save(Board board) {
        // 1. 비영속 객체
        em.persist(board);
        // 2. board -> 영속 객체
        return board;
    }
}

2. BoardPersistRepository 단위 테스트

package shop.mtcoding.blog.board;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.orm.jpa.DataJpaTest;
import org.springframework.context.annotation.Import;

@Import(BoardNativeRepository.class)
@DataJpaTest
public class BoardPersistRepositoryTest {

    @Autowired // DI
    private BoardPersistRepository boardPersistRepository;

    @Test
    public void save_test(){
        // given
        Board board = new Board("제목5", "내용5", "ssar");

        // when
        boardPersistRepository.save(board);
        System.out.println("save_test : "+board);

        // then
    }
}

3. Board 엔티티 생성자 수정 및 날짜 어노테이션 수정

package shop.mtcoding.blog.board;

import jakarta.persistence.*;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.hibernate.annotations.CreationTimestamp;

import java.sql.Timestamp;

@NoArgsConstructor
@Data
@Table(name = "board_tb")
@Entity
public class Board {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Integer id;
    private String title;
    private String content;
    private String username;

    @CreationTimestamp // pc -> db (날짜주입)
    private Timestamp createdAt;

    public Board(String title, String content, String username) {
        this.title = title;
        this.content = content;
        this.username = username;
    }
}

4. BoardRequest 만들기

DTO로 받아서, Entity로 변경해서 PC에서 던져야 한다