MySQL PHPExcel查询执行时间太长

Question

我正在运行MySQL的PHP​​Excel输出。

当我使用几行输出运行代码并输出到Excel时，所有事情都很好，当我运行下面的代码时，根据zend服务器日志，执行时间非常漫长。

我没有得到任何输出，我得到一个请求，在似乎是永恒之后打开一个PHP文件！

任何协助赞赏。

这里是到目前为止的代码：

$queryGetIMEI = "SELECT DISTINCT(wi_iridium_og_device) FROM wi_iridium_og ORDER BY wi_iridium_og_device DESC"; 
//declare the new array for the IMEI numbers 
$IMEI = array(); 

if ($result = $mysqli->query($queryGetIMEI)) { 

    /* fetch associative array */ 
    while ($row = $result->fetch_array()) { 
     $IMEI[] = $row["wi_iridium_og_device"]; 
    } 
    /* free result set */ 
    $result->free(); 
} 

// call the PHPexcel Files 
require_once 'classes/PHPExcel.php'; 
require_once 'classes/PHPExcel/IOFactory.php'; 


$objPHPExcel = new PHPExcel(); 

$sheet_count = 0; 


foreach ($IMEI as $c) { 
    if ($sheet_count > 0) { 

     // This creates the next sheet in the sequence 
     // One sheet per IMEI in this example 
     $objPHPExcel->createSheet(); 
     $objPHPExcel->setActiveSheetIndex($sheet_count); 
    } 

    // Add tab label to the sheet 
    $objPHPExcel->getActiveSheet()->setTitle(substr($c,0,30)); 

    // Column headings in the first row 
    $objPHPExcel->getActiveSheet()->setCellValue('A1','Device'); 
    $objPHPExcel->getActiveSheet()->setCellValue('B1','Site Reference'); 
    $objPHPExcel->getActiveSheet()->setCellValue('C1','Charge Type'); 
    $objPHPExcel->getActiveSheet()->setCellValue('D1','Date'); 
    $objPHPExcel->getActiveSheet()->setCellValue('E1','Time'); 
    $objPHPExcel->getActiveSheet()->setCellValue('F1','Number Called'); 
    $objPHPExcel->getActiveSheet()->setCellValue('G1','Service'); 
    $objPHPExcel->getActiveSheet()->setCellValue('H1','Call Termination'); 
    $objPHPExcel->getActiveSheet()->setCellValue('I1','MSISDN'); 
    $objPHPExcel->getActiveSheet()->setCellValue('J1','Originating Country'); 
    $objPHPExcel->getActiveSheet()->setCellValue('K1','UNUSED_3'); 
    $objPHPExcel->getActiveSheet()->setCellValue('L1','UNUSED_4'); 
    $objPHPExcel->getActiveSheet()->setCellValue('M1','UNUSED_5'); 
    $objPHPExcel->getActiveSheet()->setCellValue('N1','UNUSED_6'); 
    $objPHPExcel->getActiveSheet()->setCellValue('O1','UNUSED_7'); 
    $objPHPExcel->getActiveSheet()->setCellValue('P1','UNUSED_8'); 
    $objPHPExcel->getActiveSheet()->setCellValue('Q1','Units'); 
    $objPHPExcel->getActiveSheet()->setCellValue('R1','Currency'); 
    $objPHPExcel->getActiveSheet()->setCellValue('S1','Charge'); 

    // Dynamic data comes next 
    // Query the DB based on the IMEI value. Pass the result to the while loop 

    $query_GetBillPerIMEI = "SELECT SQL_NO_CACHE wi_iridium_og_device, wi_iridium_og_charge_type, wi_iridium_og_date, wi_iridium_og_time, wi_iridium_og_number_called, wi_iridium_og_service FROM wi_iridium_og WHERE wi_iridium_og_device = ". $c ." AND wi_iridium_og.wi_iridium_og_charge_type != 'SBD Overage' ORDER BY wi_iridium_og_charge_type ASC"; 
    $result = $mysqli->query($query_GetBillPerIMEI);  
    $rowcount = 2; 
    while ($row = $result->fetch_array()){ 

     $objPHPExcel->getActiveSheet()->SetCellValue('A' .$rowcount, $row['wi_iridium_og_device']); 
     $objPHPExcel->getActiveSheet()->SetCellValue('B' .$rowcount, $row['wi_iridium_og_site_reference']); 
     $objPHPExcel->getActiveSheet()->SetCellValue('C' .$rowcount, $row['wi_iridium_og_charge_type']); 
     $objPHPExcel->getActiveSheet()->SetCellValue('D' .$rowcount, $row['wi_iridium_og_date']); 
     $objPHPExcel->getActiveSheet()->SetCellValue('E' .$rowcount, $row['wi_iridium_og_time']); 
     $objPHPExcel->getActiveSheet()->SetCellValue('F' .$rowcount, $row['wi_iridium_og_number_called']); 
     $objPHPExcel->getActiveSheet()->SetCellValue('G' .$rowcount, $row['wi_iridium_og_service']); 

当我下面的行添加到输出：

$objPHPExcel->getActiveSheet()->SetCellValue('G' .$rowcount, $row['wi_iridium_og_service']); 

的文件，然后运行失败，并产生输出。

我在数据库中有超过30,000个条目需要查询。

帮助!!!

Answer 1

首先了解PHP PDO和Prepared Statements：这将是足以应付/避免SQL注入（上查询的问题在这里WHERE wi_iridium_og_device = ". $c ." AND，因为你不知道这可能是有害的$c值）。

关于如何返工，以提高你的源代码的性能......（这不会是功能性的，它读成伪代码）

<?php 
// call the PHPexcel Files 
require_once 'classes/PHPExcel.php'; 
require_once 'classes/PHPExcel/IOFactory.php'; 

$objPHPExcel = new PHPExcel(); 
$sheet_count = 0; 

$queryGetIMEI = "SELECT DISTINCT(wi_iridium_og_device) FROM wi_iridium_og ORDER BY wi_iridium_og_device DESC"; 

//declare the new array for the IMEI numbers 

if ($result = $mysqli->query($queryGetIMEI)) 
{ 
    /* fetch associative array */ 
    while ($row = $result->fetch_array()) 
    { 
     // your foreach login in here (without the foreach) 
    } 
} 

这应该提高你的内存占用，但可能你”也可以改善你的查询。