MongoDB快速入门及其SpringBoot实战好代码教程

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

spring:
  data:
    mongodb:
      host: 127.0.0.1
      database: articledb
      port: 27017

@SpringBootApplication
public class ArticleApplication {
    public static void main(String[] args) {
        SpringApplication.run(ArticleApplication.class, args);
    }
}

@Data
@Document(collection = "comment")  // 指定为comment集合
@CompoundIndex(def = "{'userid':1}")  // 在userid上建立升序索引
public class Comment implements Serializable {
    @Id
    private String id;//主键
    //该属性对应mongodb的字段的名字，如果一致，则无需该注解
    @Field("content")
    private String content;//评论内容
    private Date publishtime;//发布日期
    //添加了一个单字段的索引
    @Indexed
    private String userid;//发布人ID
    private String nickname;//昵称
    private LocalDateTime createdatetime;//评论的日期时间
    private Integer likenum;//点赞数
    private Integer replynum;//回复数
    private String state;//状态
    private String parentid;//上级ID
    private String articleid;
}

public interface CommentRepository extends MongoRepository<Comment, String> {
}

@Service
public class CommentService {
    @Autowired
    private CommentRepository commentRepository;
    /**
     * 保存评论
     * @param comment
     */
    public void saveComment(Comment comment){
        commentRepository.save(comment);
    }
    /**
     * 更新评论
     * @param comment
     */
    public void updateComment(Comment comment){
        commentRepository.save(comment);
    }
    /**
     * 根据id删除评论
     * @param id
     */
    public void deleteCommentById(String id){
        commentRepository.deleteById(id);
    }
    /**
     * 查询所有评论
     * @return
     */
    public List<Comment> findCommentList(){
        return commentRepository.findAll();
    }
    /**
     * 根据id查询评论
     * @param id
     * @return
     */
    public Comment findCommentById(String id){
        return commentRepository.findById(id).get();
    }
    /**
     * 文章评论点赞，点赞数+1
     * @param id
     */
    public void updateCommentLikenum(String id){
        Query query = new Query(Criteria.where("_id").is(id));
        Update update = new Update();
        update.inc("likenum");
        mongoTemplate.updateFirst(query, update, Comment.class);
    }
}

@SpringBootTest(classes = ArticleApplication.class)
@RunWith(SpringRunner.class)
public class CommentServiceTest {
    @Autowired
    private CommentService commentService;
    @Test
    public void testFindComment(){
        List<Comment> commentList = commentService.findCommentList();
        System.out.println(commentList);
    }
    @Test
    public void testFindCommentById(){
        Comment comment = commentService.findCommentById("1");
        System.out.println(comment);
    }
    @Test
    public void testSaveComment(){
        Comment comment = new Comment();
        comment.setArticleid("100002");
        comment.setContent("樊神yyds");
        comment.setCreatedatetime(LocalDateTime.now());
        comment.setUserid("1003");
        comment.setNickname("随缘夏沫");
        comment.setState("1");
        comment.setLikenum(0);
        comment.setReplynum(0);
        commentService.saveComment(comment);
    }
    @Test
    public void testFindCommentListByParentid(){
        Page<Comment> page = commentService.findCommentListByParentid("1", 1, 2);
        System.out.println(page.getContent());
    }
    @Test
    public void testUpdateCommentLikenum(){
        commentService.updateCommentLikenum("2");
    }
}