cxinv/app/admin/model/TradePool.php

<?php
declare (strict_types = 1);

namespace app\admin\model;

use think\Model;

/**
 * @mixin \think\Model
 */
class TradePool extends Model
{
    //
    public function Company()
    {
        return $this->belongsTo(CompanyInfo::class,"companyNo",'companyNo')->bind(["companyName"=>"company_name"]);
    }
}