=============
后端_最热文章
=============

每篇文章都有一个阅读数，以之表示文章的热度。

1 文章服务

1.1 文章服务接口

/ysdblog-api/src/main/java/com/weihome/ysdblog/service/ArticleService.java：

public interface ArticleService {
    ...
    /**
     * 查询最热文章
     */
    public Result hottest(int limit);
    ...
}

1.2 文章服务实现

SQL> select id, title from t_article order by view_count desc limit 5

/ysdblog-api/src/main/java/com/weihome/ysdblog/service/impl/ArticleServiceImpl.java：

...
public class ArticleServiceImpl implements ArticleService {
    ...
    @Override
    public Result hottest(int limit) {
        LambdaQueryWrapper<Article> queryWrapper =
            new LambdaQueryWrapper<>();
        queryWrapper.orderByDesc(Article::getViewCount);
        queryWrapper.select(Article::getId, Article::getTitle)
            .last("limit " + limit);
        List<Article> articles = articleMapper.selectList(queryWrapper);
        return Result.success(copyList(articles, false, false));
    }
    ...
}

2 文章控制器

/ysdblog-api/src/main/java/com/weihome/ysdblog/controller/ArticleController.java：

...
public class ArticleController {
    ...
    /**
     * 查询最热文章
     */
    @GetMapping("hottest")
    public Result hottest() {
        return articleService.hottest(5);
    }
    ...
}

3 运行测试

Postman
    GET
        localhost:8888/article/hottest
--------------------------------------
{
    "success": true,
    "code": 200,
    "msg": "success",
    "data": [
        {
            "id": "1511577146642972674",
            "commentCount": null,
            "createDate": "2022-04-06 13:39:53",
            "summary": null,
            "title": "title_a",
            "viewCount": null,
            "weight": null,
            "author": null,
            "content": null,
            "category": null,
            "tags": null
        },
        {
            "id": "1511577630850203650",
            "commentCount": null,
            "createDate": "2022-04-06 13:39:53",
            "summary": null,
            "title": "title_b",
            "viewCount": null,
            "weight": null,
            "author": null,
            "content": null,
            "category": null,
            "tags": null
        }
    ]
}