如果数据量超过一万条，采取循环查询思路实例

连锁查询
$query = $query->from('paypal_transaction_list AS tl')
                  ->distinct('tl.transaction_updated_date')
//                ->leftJoin('paypal_transaction_detail AS td','td.transaction_id','=','tl.transaction_id')
                ->leftJoin('paypal_account AS a','a.paypal_account','=','tl.account_number')
                ->select('a.email AS paypa1_email','tl.transaction_updated_date','tl.transaction_event_code','tl.transaction_status','tl.currency_code','tl.transaction_amount','tl.fee_amount','a.email','tl.transaction_id','tl.transaction_subject as item_name','tl.transaction_subject','tl.paypal_reference_id','tl.available_balance')
                //->groupBy('tl.transaction_event_code', 'tl.transaction_amount')
                ->orderBy('tl.transaction_updated_date','asc');

 if ($this->query) {
            $this->query($this->query);
        }


  /**
     * 数据库查询
     *
     * @return void
     */
    public function query(Builder $query, $size = 10000)
    {
        $page = 1;
        $size = $size ?: $this->size;
        do {
           //每次查询一万条，page自加+1，然后到最后数据不等于条数，就停止查询
            $datas = $query->skip(($page - 1) * $size)->take($size)->get();
            $this->array($datas);
            $page++;
        } while (count($datas) == $size);
    }

   /**
     * 数组处理
     *
     * @return void
     */
    public function array($data = [])
    {
        foreach ($data as $data) {
            $this->push($this->map($data));
        }
    }

 protected function map($data): array
    {
        return $data;
    }

/**
     * 写入数据
     *
     * @param array $data
     * @return void
     */
    public function push($data)
    {

        $rows = [];
        foreach ($data as $value) {
            $rows[] = "\t" . iconv('utf-8', 'GBK//IGNORE', (string) $value);
        }
        fputcsv($this->handle, $rows);
    }

 更新多条，变量不单独一次查出所有数据

 //查询出所有需要待更新的数据,分页处理
        $page = 1;
        $listingUpdate = new OnlineListingUpdate();
        $count = $listingUpdate->getCountByRawSql([$this->type], $itemId);
        // dd($count);
        $totalPages = ceil($count / $this->limit);
        do {
            $offset = ($page - 1) * $this->limit;
            $data = $listingUpdate->getListByRawSql([$this->type], $this->limit, $offset, $itemId);

            if (!empty($data)) {
                foreach ($data as $row) {
                    $this->updateProduct($row);
                }
            }
            $page++;
        } while ($page <= $totalPages);