댓글 도메인 개발

1. Comment Class

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import lombok.Getter;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
@Getter
public class Comment {
    
    @Id
    @GeneratedValue
    private Long id;
    
    private String content;

    public Comment() {
    }

    public Comment(String content) {
        this.content = content;
    }

    public void changeContent(String content){
        this.content = content;
    }
}

 

 

 

2. CommentRepository

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import hello.blog.domain.comment.Comment;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Repository;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import java.util.List;
import java.util.Optional;

@Repository
@RequiredArgsConstructor
public class CommentJpaRepository implements CommentRepository{

    @PersistenceContext
    private final EntityManager em;


    @Override
    public Comment save(Comment comment) {
        em.persist(comment);
        return comment;
    }

    @Override
    public Optional<Comment> findById(Long id) {
        return Optional.ofNullable(em.find(Comment.class, id));
    }


    @Override
    public Optional<List<Comment>> findAll() {
        return Optional.ofNullable(
                em.createQuery("select c from Comment c", Comment.class).getResultList());
    }


    @Override
    public void removeComment(Comment comment) {
        em.remove(findById(comment.getId()));

    }

    @Override
    public void clear() {
        em.clear();
    }
}

 

 

3. CommentServiceImpl

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import hello.blog.domain.comment.Comment;
import hello.blog.repository.comment.CommentRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.persistence.NoResultException;
import java.util.List;

@Service
@Transactional(readOnly = true)
@RequiredArgsConstructor
public class CommentServiceImpl implements CommentService{

    private final CommentRepository commentRepository;

    @Override
    @Transactional
    public Comment saveComment(Comment comment) {
        return commentRepository.save(comment);
    }

    @Override
    public Comment findCommentById(Long id) {
        return commentRepository.findById(id).orElseThrow(NoResultException::new);
    }

    @Override
    public List<Comment> findAll() {
        return commentRepository.findAll().orElseThrow(NoResultException::new);
    }

    @Override
    public Comment updateComment(Long id, Comment updatedPost) {
        Comment comment = commentRepository.findById(id).orElseThrow(NoResultException::new);
        comment.changeContent(updatedPost.getContent());
        return  commentRepository.save(comment);
    }

    @Override
    public void deleteComment(Long id) {
        commentRepository.removeComment(findCommentById(id));
    }

    @Override
    public void clearRepository() {
        commentRepository.clear();
    }
}

 

 

4. GitHub : 211003 CommentDomain

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GitHub - bsh6463/blog