PHP导出为CSV-不导出最新数据

Question

I have spent the past 5 or so hours searching forums and the internet for an answer to this issue. 在过去的5个小时左右的时间里，我一直在论坛和互联网上搜索该问题的答案。

Basically, I have a webpage where a table is generated using data collected from the Oracle SQL Server. 基本上，我有一个网页，其中使用从Oracle SQL Server收集的数据生成表。

When the page loads, the table shows with the past 7 days worth of data. 页面加载后，该表将显示过去7天的数据。 I have a date selection field with a "Go" button and an "Export to CSV" button. 我有一个带有“转到”按钮和“导出为CSV”按钮的日期选择字段。

If I click the Export button it prompts be to save or open. 如果单击“导出”按钮，则提示是保存或打开。 The CSV is fine it has the correct Data etc etc. CSV很好，它具有正确的数据等。

The issue is, when I select a date using the date selection field and hit go... the Table on the page refreshes showing me the data for the specific day. 问题是，当我使用日期选择字段选择一个日期并单击go ...时，页面上的表将刷新，为我显示特定日期的数据。 If I then click Export to CSV, the data seems to still be the original Data from when the page first loaded. 如果然后单击“导出为CSV”，则该数据似乎仍是页面首次加载时的原始数据。

This is my code... I am sorry if the code isn't very great I am a complete novice to php. 这是我的代码...对不起，如果代码不是很好，我是php的新手。

if(isset($_POST['csv'])) $csv_request=$_POST['csv']; else $csv_request="";  
if(isset($_POST['datepicker'])) $date_filter=$_POST['datepicker']; else $date_filter="";

$output_csv = "";
$chosenDate = $date_filter;

if($chosenDate== "" || $chosenDate == Null){
        $mywhere = 'where timestamp >= trunc(sysdate)-7';
    }
    elseif ($chosenDate=='datepicker'){
            $date_chosen = $_POST['datePicker'];
            $mywhere = "where timestamp like to_date('$date_chosen', 'dd/mm/yyyy')";
    }


        $sql =  "Select to_char(timestamp, 'dd/mm/yy hh24:mi') timestamp, site, sum(Manual_coos) Manual_COOS,Sum(Faulty_COOS) Faulty_COOS, bearer from t_ca_Processed
                    ".$mywhere."
                    AND bearer = '4G'
                    AND faulty_coos = 1
                    group by timestamp, site, Manual_coos, Faulty_COOS, bearer
                UNION ALL
                Select to_char(timestamp, 'dd/mm/yy hh24:mi') timestamp, site, sum(Manual_coos) Manual_COOS,Sum(Faulty_COOS) Faulty_COOS, bearer from t_ca_Processed
                    ".$mywhere."
                    AND bearer = '4G'
                    AND Manual_coos = 1
                    group by timestamp, site, Manual_coos, Faulty_COOS, bearer
                Order by timestamp ASC";



            $st = $db->execute($sql);

        $output = "<table class = 'sortable' border = 1 Align = 'Center'>
                        <tr style = 'background-color: #f00;'>
                            <th>TimeStamp</th>
                            <th>Site</th>
                            <th>Manual COOS Total</th>
                            <th>Faulty COOS Total</th>
                            <th>Bearer</th>
                        </tr>";

        $output_csv = "TimeStamp,Site,Manual COOS Total,Faulty COOS Total,Bearer\n";
        $counter = 0;

        while (($row = oci_fetch_row($st)) != false)
            {
                    $output .= "<tr";

                    $output .= "><td>$row[0]</td>
                        <td align=center>$row[1]</td>
                        <td align=center>$row[2]</td>
                        <td align=center>$row[3]</td>
                        <td align=center>$row[4]</td></tr>\n";

                    $output_csv .= "$row[0],$row[1],$row[2],$row[3],$row[4]\n";
                    $counter ++;
            }
        $output .= "</table>";
        unset($db);

    If ($csv_request=='csv'){

        header("Content-Type: application/octet-stream");
        header("Content-Disposition: attachment; filename=\"".$File_name.".csv\";");
        header("Content-Transfer-Encoding: binary");
        echo $output_csv;
    }
    else
    {

This is my HTML 这是我的HTML

 <!DOCTYPE html>
<html>
    <head>
    <style>
        table.sortable tbody tr:nth-child(2n) td {
        background: #DDDDDD;
        }
        table.sortable tbody tr:nth-child(2n+1) td {
        background: #ccfffff;
        }
    </style>
        <script type='text/javascript' src="/common/javascript/kpc_sorttable2.js"></script>
        <script type='text/javascript' src='/common/flot/jquery.js'></script>
        <script type="text/javascript" src="/common/jquery/ui/1.10.2/ui/jquery-ui.js"></script>
        <script type="text/javascript" src="/Common/jQuery/ui/1.10.2/ui/jquery.ui.core.js"></script>
        <script type="text/javascript" src="/Common/jQuery/ui/1.10.2/ui/jquery.ui.widget.js"></script>
        <script type="text/javascript" src="/Common/jQuery/ui/1.10.2/ui/jquery.ui.datepicker.js"></script>
        <link rel= 'stylesheet' type=text/css href='/common/style.css'>
        <script>
                $(function() {
                    $( "#datepicker" ).datepicker({
                        dateFormat: 'dd/mm/yy'
                    })
                })
        </script>
        <script>

        </script>
    </head>
    <body>

        <?php   generateHeader($menu,'4G Cells Down',1); ?>
        <div class='whitebox'>
        <form method='post' action="" name="parameters" id="parameters">
            <input type='hidden' name='csv' value='csv'>
            <input type='submit' value="Export as CSV" style="float: right;">
        </form>
        <form method='post' action="" name="parameters1" id="parameters1">
            <h3>Last Refreshed <?= $page_load_time ?></h3>
            <input type='hidden' name='datepicker' value='datepicker'>
            <h3>Date: <input type="text" id="datepicker" name="datePicker"><input type='submit' value="Go"></h3>
            <p><?= $output ?><p>
        </form>
        </div>
        <?php
            generateFooter();
        ?>
    </body>
</html> 
<?php } ?>

when I echo $output_csv I always see the newest data set... however the CSV is always the original Data. 当我回显$ output_csv时，我总是看到最新的数据集...但是CSV始终是原始数据。 I have tried to Echo the CSV and I get an error saying headers have already been sent... 我尝试回显CSV，但收到一条错误消息，指出标题已发送。

I am wondering if when the page originally loads, the csv has been created and only gets prompted to download once I hit the export button and when I have the new data, the file cannot be re-written? 我想知道是否在最初加载页面时创建了csv，并且仅在单击“导出”按钮后才得到下载提示，并且当我拥有新数据时，是否无法重写该文件？

Again sorry if im not very clear, new to this :) 再次抱歉，如果即时消息不是很清楚，这是新的:)

cheers Mike 迈克欢呼

Answer 1

Your file probably gets cached by the webserver. 您的文件可能已被Web服务器缓存。 If you add a Cache buster and/or cache header it should work. 如果添加了缓存无效化器和/或缓存头，则它应该可以工作。

header("Content-Transfer-Encoding: binary");
header("Cache-Control: no-cache, must-revalidate");
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past

More info about the PHP header function, including caching directives. 有关PHP 标头功能的更多信息，包括缓存指令。

If you generate a unique filename for each change or request, it will also be seen as a new file and caching will be disabled. 如果您为每个更改或请求生成一个唯一的文件名，它也将被视为一个新文件，并且将禁用缓存。

# Generate a unique name for each request
$File_name = uniqid($File_name . "_");
header("Content-Disposition: attachment; filename=\"".$File_name.".csv\";");

See PHP function uniqid for more specifics about the functionality. 有关功能的更多详细信息，请参见PHP函数uniqid 。

Answer 2

The problem is that when you search for a date, the page refresh and the form refresh too, so when you click on the export csv the "request" is to get the default view. 问题在于，当您搜索日期时，页面刷新和表单也会刷新，因此，当您单击导出csv时，“请求”将获得默认视图。 Keep your form (selected data) updated with the current view. 使用当前视图保持表单（选定数据）的更新。

The value of this 这个的价值

<input type="text" id="datepicker" name="datePicker">

have to been keep always with the current view 必须始终保持当前视图

PHP导出为CSV-不导出最新数据

问题描述

2 个解决方案

解决方案1
0 2015-11-04 16:20:58

解决方案2
0 2015-11-04 16:34:06

PHP导出为CSV-不导出最新数据

问题描述

2 个解决方案

解决方案1 0 2015-11-04 16:20:58

解决方案2 0 2015-11-04 16:34:06

解决方案1
0 2015-11-04 16:20:58

解决方案2
0 2015-11-04 16:34:06