=============
后端_阅读更新
=============

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

...
public class ArticleServiceImpl implements ArticleService {
    ...
    @Override
    public Result details(Long articleId) {
        ...
        // 每次显示文章详情，文章阅读数加一
        updateArticleViewCount(articleMapper,
            article.getId(), article.getViewCount());
        ...
    }
    ...
    private void updateArticleViewCount(
        ArticleMapper articleMapper, long id, int viewCount) {
        Article article = new Article();
        article.setViewCount(viewCount + 1);
        LambdaUpdateWrapper<Article> updateWrapper =
            new LambdaUpdateWrapper<>();
        updateWrapper.eq(Article::getId, id);
        updateWrapper.eq(Article::getViewCount, viewCount);
        // 只更新非空属性对应的字段
        articleMapper.update(article, updateWrapper);
    }
    ...
}