suryee-stat/application/index/model/Seller.php

<?php
namespace app\index\model;
use app\index\model\MySqlite;

class Seller extends MySqlite
{
    public function __construct($tablename='')
    {
        parent::__construct();
        if ($tablename) {
            $this->tablename = $tablename;
        } else {
            $this->tablename = strtolower(basename(__CLASS__));
        }
    }
}