使用 mysql & php 创建多个 csv 文件 while

Question

我正在尝试使用 mysql 和 php while 生成多个渐进式 csv 文件（名称为 DOC_n°.csv）。

//query 1
$query2 ="SELECT id_order FROM ps_orders";
$result2= mysql_query($query2); 

$i=1;

while ($riga2 = mysql_fetch_array($result2)){
//query 2
$query = "SELECT ps_order_detail.product_name,ps_orders.id_order,ps_orders.date_add,ps_order_detail.unit_price_tax_incl,ps_order_detail.id_order_detail,ps_order_detail.product_quantity,ps_order_detail.product_reference,ps_order_detail.product_weight,ps_order_detail.unit_price_tax_incl,ps_address.id_customer,ps_address.firstname,ps_address.lastname,ps_address.address1,ps_address.address2,ps_address.postcode,ps_address.city
FROM ps_orders
JOIN ps_order_detail ON  ps_orders.id_order = ps_order_detail.id_order
JOIN ps_address ON ps_orders.id_customer = ps_address.id_customer
WHERE ps_orders.id_order=$i;";

$result = mysql_query($query);  
    //second while to write document and values inside of it
    while ($riga = mysql_fetch_array($result)){
//useful variable to write files
        $path ="TMPIN/";
        $doc=$path."DOC_".$i.".csv";
        $myfile = fopen($doc, "w");
...
...
information inside the csv
...
..          
fwrite($myfile, $testo."\n");
fclose($myfile);
};
$i++;
};

我的代码有效，但在生成的 csv 文件中，我发现之前生成的所有循环。有没有办法只查看生成的 LAST 循环？

Answer 1

你有 2 个 while 循环。您仅在主循环中更改文件名，因此在子循环中，您始终写入相同的 csv（顺便大量打开/关闭此文件！）

所以你应该尝试这样的事情：

$query = "SELECT ps_order_detail.product_name,ps_orders.id_order,ps_orders.date_add,ps_order_detail.unit_price_tax_incl,ps_order_detail.id_order_detail,ps_order_detail.product_quantity,ps_order_detail.product_reference,ps_order_detail.product_weight,ps_order_detail.unit_price_tax_incl,ps_address.id_customer,ps_address.firstname,ps_address.lastname,ps_address.address1,ps_address.address2,ps_address.postcode,ps_address.city
    FROM ps_orders
    JOIN ps_order_detail ON  ps_orders.id_order = ps_order_detail.id_order
    JOIN ps_address ON ps_orders.id_customer = ps_address.id_customer
    WHERE 1=1;";

$result = mysql_query($query);  
//second while to write document and values inside of it 
while ($riga = mysql_fetch_array($result)){
    $testo = "";
    $testo .= "stuff to write\n";
    ...
    ...
    information inside the csv
    ...
    ...

    // once you know what to write, open file.
    //useful variable to write files
    $path ="TMPIN/";
    $doc=$path."DOC_".$riga['id_order'].".csv";
    $myfile = fopen($doc, "w");
    fwrite($myfile, $testo."\n");
    fclose($myfile);
}

编辑：（感谢@Kickstart）

删除了第一个没用的循环...你只能做1个查询

Answer 2

您的循环设置错误，核心逻辑也非常低效。你应该学习如何使用JOINs。

无论如何，修复你的代码

while(... main query loop) {
    $file = fopen(...);
    $subquery = mysql_query(...);
    while($row = mysql_fetch_array($subquery)) {
        fputcsv($file, $subquery);
    }
    fclose($file);
}

注意 fopen/close 是如何在内部循环之外的。

Answer 3

消除额外的循环，只输出每个 id_order 的详细信息。仅在 id_order 更改时输出文件。

<?php

//query 2
$query = "SELECT ps_order_detail.product_name,ps_orders.id_order,ps_orders.date_add,ps_order_detail.unit_price_tax_incl,ps_order_detail.id_order_detail,ps_order_detail.product_quantity,ps_order_detail.product_reference,ps_order_detail.product_weight,ps_order_detail.unit_price_tax_incl,ps_address.id_customer,ps_address.firstname,ps_address.lastname,ps_address.address1,ps_address.address2,ps_address.postcode,ps_address.city
FROM ps_orders
JOIN ps_order_detail ON  ps_orders.id_order = ps_order_detail.id_order
JOIN ps_address ON ps_orders.id_customer = ps_address.id_customer
ORDER BY ps_orders.id_order";

$result = mysql_query($query);  
    //second while to write document and values inside of it
$last_id_order = 0;
while ($riga = mysql_fetch_array($result))
{
    if ($last_id_order != $riga['id_order'] and $last_id_order != 0)
    {
        output_file($testo, $last_id_order);
        $testo = '';
        $last_id_order = $riga['id_order'];
    }
    //useful variable to write files
    ...
    ...
    information inside the csv
    ...
    ..          
}
if ($last_id_order != 0)
{
    output_file($testo, $last_id_order);
}

function output_file($testo, $last_id_order)
{
    //useful variable to write files
    $path = "TMPIN/";
    $doc = $path."DOC_".$last_id_order.".csv";
    $myfile = fopen($doc, "w");
    fwrite($myfile, $testo."\n");
    fclose($myfile);
}