yuanchengpasc/application/manage/model/ExamClassModel.php

<?php

namespace app\manage\model;

use think\Model;
use think\Db;


class ExamClassModel extends Model {
    protected $table = 'exam_class';

    public function queryAll(){
        return Db::view('exam_class', 'id, institution_id, name')
            ->view('institution', 'name as insName', 'exam_class.institution_id=institution.id')
            ->select();
    }
}