/**
     * バルクインサート
     *
     * @param array $params
     * @param int $chunk_number
     */
    public function bulkInsert(array $params, int $chunk_number = 1000)
    {
        $chunk_arrays = array_chunk($params, $chunk_number);
        foreach ($chunk_arrays as $chunk_array) {
            DB::table('sample_table')->insert($chunk_array);
        }
    }