PHP-提取数据问题，提取时间过长

你好，我在获取数据时遇到了问题，需要很长时间，实际上需要10秒才能将数据获取到网格中，有人解决了这个问题吗？请多多指教，谢谢

请参阅下面的代码

在这个for循环中，当我删除sql语句并将其放在外部时，表立即显示，但无法正确获取

SQL语句代码中断行

还有这段代码，我认为是出现了问题，当我删除了这段sql代码并将其带到for循环之外时，数据无法正确获取，但表会立即显示

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您似乎调用了18个月内某个月的所有数据，使用了18种不同的查询。我建议获取18个月期间的所有数据，然后在获取数据后每月对其进行解析。 这样，您就不会要求数据库查找相同的数据18次

将SQL置于for循环之外，只需根据18个月窗口的开始和结束日期调用数据

编辑： 我写了一些关于如何解决你的问题的代码。我要远离可怕的sql查询。我甚至不能开始理解它是怎样的，为什么是这样的

//Write a query that calls for all 18 months of data.
$sql = "SELECT Data for all 18 months";

//Call your Database
$sqlData = queryDatabase($sql, $stVal, $stLimit);

//Parse the Data into 18 seperate months
$gData = ParseData($sqlData);

$tableID = 'gridTable';
$merge = 'th,td';

echo json_encode(array(
    'datenow' => date('M', strtotime($dateposted)),
    'tableID' => $tableID,
    'merge' => $merge,
    'dates' => $thisDate,
    'mheader' => $mheader,
    'dheader' => $dheader,
    'date' => $date,
    'gridData' => $gData
));

//This function slices your sql data into pieces divided by month.
function ParseData($sqlData){
  $dataInMonths = [];
  //This depends on how you select your data from the DB, I'm going to use assoc 
  //arrays right now.
  $i = -1;
  foreach($sqlData as $dataRow){
    $currentDate = $dataRow['date'];
    $currentTime = strtotime($currentDate);
    $currentMonth = date("F-Y", $currentTime);

    if($currentMonth != $previousMonth){
      $i++;
      $dataInMonths[$i] = [];
    }
    $dataInMonths[$i][] = $dataRow;

    $previousMonth = $currentMonth;
  }

  //Now your data is an array of 18 items, each with a month of their own data. 
  //You can now continue to parse it to fit within your grid.

  return $dataInMonths;
}

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你好，先生！如果我删除for循环，代码的结构是什么？请给我一个首选项的源代码？谢谢你在原文中添加了一个编辑。由于我没有完整的代码库，我添加了一些伪代码，这些代码调用程序中其他地方的输入。您好！在我的代码中，我应该把functionParseData放在哪里？我还想知道，在我的原始代码之前，我应该把变量放在for循环中的什么地方？请给我更多的建议，先生！非常感谢你！该函数可以在当前正在执行的脚本中的任何位置执行。

for($x=0;$x<18;$x++){
        $thisDate = date('Y-m-d', strtotime($gridDate.'+'.$x.' months'));
        $thisDate2 = date('Y-m-d', strtotime($gridfDate.'+'.$x.' months'));
        $mheader[$x] = date('Y', strtotime($gridDate.'+'.$x.' months'));
        $dheader[$x] = date('M', strtotime($gridDate.'+'.$x.' months'));
        $date = $thisDate AND $thisDate2;

        //See code below for this break line of codes

       $sql .=",(SELECT CASE WHEN COUNT(tc.`name`) = 0 THEN '<td data-attribute=\"".$thisDate2."\"></td>' WHEN DATE_FORMAT(min(pd.`duedate`), '%Y-%m') <= DATE_FORMAT('$thisDate', '%Y-%m') AND DATE_FORMAT(max(pd.`duedate`), '%Y-%m') >= DATE_FORMAT('$thisDate', '%Y-%m') THEN '<td class=\"paid\" data-attribute=\"".$thisDate2."\">Paid Month</td>' ELSE CONCAT('<td data-attribute=\"".$thisDate2."\" class=\"', CASE WHEN min(p.`duedate`) < '$dateposted' THEN 'occ' WHEN str_to_date(t.`due_date`, '%M %d,%Y') < '$dateposted' AND t.`months` = 0 THEN 'fins' ELSE 'ten' END,'\">', tc.`name`,' #', tc.`transID`,'</td>') END AS gdisp FROM `transaction_con` tc LEFT JOIN `transaction` t ON t.`id` = tc.`transID` LEFT JOIN (select sum(pde.amount) as total, pde.net, pde.pay_type, pde.duedate, pde.transID, pde.item, pt.status from payments_depot pde left join payment_type pt on pt.id = pde.pay_type where pde.`item` = 'House Rate' AND pt.status between 1 and 2 group by pde.paymentid HAVING total = net) pd ON t.`id` = pd.`transID` LEFT JOIN payment_type pt ON pt.`id` = pd.`pay_type` LEFT JOIN payments p ON p.transID = t.id WHERE tc.`apartmentID` = a.`id` AND DATE_FORMAT(tc.`date`, '%m-%Y') = DATE_FORMAT('$thisDate', '%m-%Y')) AS '$thisDate'";


}
$gData = $gen->gridData($sql,$stVal,$stLimit);
$tableID = 'gridTable';
$merge = 'th,td';

echo json_encode(array(
    'datenow' => date('M', strtotime($dateposted)),
    'tableID' => $tableID,
    'merge' => $merge,
    'dates' => $thisDate,
    'mheader' => $mheader,
    'dheader' => $dheader,
    'date' => $date,
    'gridData' => $gData
)); 

     (SELECT CASE WHEN COUNT(tc.`name`) = 0 THEN '<td data-attribute=\"".$thisDate2."\"></td>' 
     WHEN DATE_FORMAT(min(pd.`duedate`), '%Y-%m') <= DATE_FORMAT('$thisDate', '%Y-%m') AND DATE_FORMAT(max(pd.`duedate`), '%Y-%m') >= DATE_FORMAT('$thisDate', '%Y-%m') THEN 

     '<td class=\"paid\" data-attribute=\"".$thisDate2."\">Paid Month</td>' 

     ELSE CONCAT('<td data-attribute=\"".$thisDate2."\" class=\"', CASE WHEN min(p.`duedate`) < '$dateposted' THEN 'occ' WHEN str_to_date(t.`due_date`, '%M %d,%Y') < '$dateposted' AND t.`months` = 0 THEN 'fins' ELSE 'ten' END,'\">', tc.`name`,' #', tc.`transID`,'</td>') 

     END AS gdisp FROM `transaction_con` tc LEFT JOIN `transaction` t ON t.`id` = tc.`transID` LEFT JOIN (select sum(pde.amount) as total, pde.net, pde.pay_type, pde.duedate, pde.transID, pde.item, pt.status from payments_depot pde left join payment_type pt on pt.id = pde.pay_type where pde.`item` = 'House Rate' 

        AND pt.status between 1 and 2 group by pde.paymentid HAVING total = net) pd ON t.`id` = pd.`transID` 

     LEFT JOIN payment_type pt ON pt.`id` = pd.`pay_type` LEFT JOIN payments p ON p.transID = t.id 

         WHERE tc.`apartmentID` = a.`id` AND DATE_FORMAT(tc.`date`, '%m-%Y') = DATE_FORMAT('$thisDate', '%m-%Y')) AS '$thisDate'";

//Write a query that calls for all 18 months of data.
$sql = "SELECT Data for all 18 months";

//Call your Database
$sqlData = queryDatabase($sql, $stVal, $stLimit);

//Parse the Data into 18 seperate months
$gData = ParseData($sqlData);

$tableID = 'gridTable';
$merge = 'th,td';

echo json_encode(array(
    'datenow' => date('M', strtotime($dateposted)),
    'tableID' => $tableID,
    'merge' => $merge,
    'dates' => $thisDate,
    'mheader' => $mheader,
    'dheader' => $dheader,
    'date' => $date,
    'gridData' => $gData
));

//This function slices your sql data into pieces divided by month.
function ParseData($sqlData){
  $dataInMonths = [];
  //This depends on how you select your data from the DB, I'm going to use assoc 
  //arrays right now.
  $i = -1;
  foreach($sqlData as $dataRow){
    $currentDate = $dataRow['date'];
    $currentTime = strtotime($currentDate);
    $currentMonth = date("F-Y", $currentTime);

    if($currentMonth != $previousMonth){
      $i++;
      $dataInMonths[$i] = [];
    }
    $dataInMonths[$i][] = $dataRow;

    $previousMonth = $currentMonth;
  }

  //Now your data is an array of 18 items, each with a month of their own data. 
  //You can now continue to parse it to fit within your grid.

  return $dataInMonths;
}