crm/app/model/CampEmployee.php

<?php

namespace app\model;

use think\Model;

class CampEmployee extends Model
{
    public function employee()
    {
        return $this->hasOne(Employee::class,'id','employee_id');
    }
    public function camp()
    {
        return $this->hasOne(Camp::class,'id','camp_id');
    }
}