//评论表
class Comment extends Model
{
    public function article() {
        //不设置bind的全部显示
        return $this->belongsTo(Article::class)->bind([
            "article_title"=>"title"
        ]);
    }
}

    public function demo5(){
        //使用hasWhere根据article的条件查询（注：comment与article有关联），同时使用with把article查询出来：
        $list = Comment::hasWhere(‘article‘,[["title","like","%美国%"]])->with("article")->select()->toArray();
        

　　　　　//或者，效果一样
        $list = Comment::with([‘article‘=>function($query){
            $query->where("title","like","%量子%");
        }])->select();
    }

SELECT * FROM `comment` `Comment` INNER JOIN `article` `Article` ON `Comment`.`article_id`=`Article`.`id` 
WHERE  `Article`.`title` LIKE ‘%美国%‘

    public function demo5(){
        $comm = Comment::withJoin("article")->where("article.title","like","%美%")->select()->toArray();
    }

SELECT * FROM `comment` `comment` INNER JOIN `article` `article` ON `comment`.`article_id`=`article`.`id` 
WHERE  `article`.`title` LIKE ‘%美%‘

    public function demo5(){
        $comm = Db::name("Comment")
            ->alias("c")
            ->join("article a","a.id = c.article_id")
            ->where("a.title","like","%量子%")
            ->select()
            ->toArray();
    }