我正在处理数据到CSV功能，但我已经卡住了。
到目前为止，它从两张表中获取所有数据，并为发票数据和客户数据的每个订单在一行中放入一个CSV文件。
我还需要通过ID获取invoice_items（我想这些将需要循环，因为可能有多个项目，但不确定如何将invoice_items添加到查询中，我还需要设置标题以及列但不确定如何）。
如果可能是这样的话会很棒：
|发票详细说明客户详细信息|发票项目
LIST ITEM LIST ITEM LIST ITEM
而不是
发票明细|客户详情|发票项目列出项目列表项目 列表项目
真实数据和标题看起来像
id |发票号码|金额|名字|地址|发票项目（和 这部分下面列出）
PHP
header("Content-type: text/csv");
// output any connection error
if ($mysqli->connect_error) {
die('Error : ('.$mysqli->connect_errno .') '. $mysqli->connect_error);
}
$file_name = 'invoice-export-'.date('d-m-Y').'.csv'; // file name
$file_path = 'downloads/'.$file_name; // file path
$file = fopen($file_path, "w"); // open a file in write mode
chmod($file_path, 0777); // set the file permission
$query_table_columns_data = "SELECT *
FROM invoices i
JOIN customers c
ON c.invoice = i.invoice
WHERE i.invoice = c.invoice
ORDER BY i.invoice";
if ($result_column_data = mysqli_query($mysqli, $query_table_columns_data)) {
// fetch table fields data
while ($column_data = $result_column_data->fetch_row()) {
$table_column_data = array();
foreach($column_data as $data) {
$table_column_data[] = $data;
}
// Format array as CSV and write to file pointer
fputcsv($file, $table_column_data, ",", '"');
}
}
答案 0 :(得分：1)
如果我理解正确，您需要加入另一张表以获取发票项目。
我还怀疑您当前的示例查询是否错误地加入了表，因为您似乎是根据发票加入客户和发票表。我预计客户可能会有很多发票，但发票只有一个客户，我希望发票表能够存储相关的客户ID，然后根据它进行连接。
因此，您可以通过以下方式获取详细信息： -
SELECT i.id,
i.invoice_number,
i.amount,
c.name,
c.address,
ii.invoice_item
FROM invoices i
INNER JOIN customers c
ON c.id = i.customer_id
INNER JOIN invoice_items ii
ON ii.invoice_id = i.id
ORDER BY i.invoice
注意我已经从SELECT *切换到选择列名（我猜的是），因为SELECT *由于各种原因而不受欢迎。如果您想要更具可读性的东西，可以为列名添加别名。
但是你想要一个从列名中获取的标题列表。假设您不想只是硬编码，我建议您从使用mysqli_fetch_row切换到mysqli_fetch_assoc，这将返回列名。
然后，您可以处理第一行的列名称并输出它们。这样的事情： -
<?php
header("Content-type: text/csv");
// output any connection error
if ($mysqli->connect_error) {
die('Error : ('.$mysqli->connect_errno .') '. $mysqli->connect_error);
}
$file_name = 'invoice-export-'.date('d-m-Y').'.csv'; // file name
$file_path = 'downloads/'.$file_name; // file path
$file = fopen($file_path, "w"); // open a file in write mode
chmod($file_path, 0777); // set the file permission
$query_table_columns_data = "SELECT i.id,
i.invoice_number,
i.amount,
c.name,
c.address,
ii.invoice_item
FROM invoices i
INNER JOIN customers c
ON c.id = i.customer_id
INNER JOIN invoice_items ii
ON ii.invoice_id = i.id
ORDER BY i.invoice";
if ($result_column_data = mysqli_query($mysqli, $query_table_columns_data))
{
// fetch table fields data
if ($column_data = $result_column_data->fetch_assoc())
{
$table_column_head = array();
$table_column_data = array();
foreach($column_data as $field_name->$data)
{
$table_column_head[] = $field_name;
$table_column_data[] = $data;
}
// Format array as CSV and write to file pointer
fputcsv($file, $table_column_head, ",", '"');
fputcsv($file, $table_column_data, ",", '"');
while ($column_data = $result_column_data->fetch_assoc())
{
$table_column_data = array();
foreach($column_data as $data)
{
$table_column_data[] = $data;
}
// Format array as CSV and write to file pointer
fputcsv($file, $table_column_data, ",", '"');
}
}
}
稍微扩展一下，只发出发票第一行的发票明细
<?php
header("Content-type: text/csv");
// output any connection error
if ($mysqli->connect_error) {
die('Error : ('.$mysqli->connect_errno .') '. $mysqli->connect_error);
}
$file_name = 'invoice-export-'.date('d-m-Y').'.csv'; // file name
$file_path = 'downloads/'.$file_name; // file path
$file = fopen($file_path, "w"); // open a file in write mode
chmod($file_path, 0777); // set the file permission
$query_table_columns_data = "SELECT i.id,
i.invoice_number,
i.amount,
c.name,
c.address,
ii.invoice_item
FROM invoices i
INNER JOIN customers c
ON c.id = i.customer_id
INNER JOIN invoice_items ii
ON ii.invoice_id = i.id
ORDER BY i.invoice";
if ($result_column_data = mysqli_query($mysqli, $query_table_columns_data))
{
// fetch table fields data
if ($column_data = $result_column_data->fetch_assoc())
{
$table_column_head = array();
$table_column_data = array();
foreach($column_data as $field_name->$data)
{
$table_column_head[] = $field_name;
$table_column_data[] = $data;
}
$prev_id = $column_data['id'];
$prev_invoice_number = $column_data['invoice_number'];
$prev_amount = $column_data['amount'];
$prev_name = $column_data['name'];
$prev_address = $column_data['address'];
// Format array as CSV and write to file pointer
fputcsv($file, $table_column_head, ",", '"');
fputcsv($file, $table_column_data, ",", '"');
while ($column_data = $result_column_data->fetch_assoc())
{
if ($prev_id == $column_data['id'] AND $prev_invoice_number == $column_data['invoice_number'] AND $prev_amount == $column_data['amount'] AND $prev_name == $column_data['name'] AND $prev_address == $column_data['address'])
{
$different_invoice = true;
}
else
{
$different_invoice = false;
$prev_id = $column_data['id'];
$prev_invoice_number = $column_data['invoice_number'];
$prev_amount = $column_data['amount'];
$prev_name = $column_data['name'];
$prev_address = $column_data['address'];
}
$table_column_data = array();
foreach($column_data as $field_name->$data)
{
$table_column_data[] = (($different_invoice or $field_name == 'invoice_item') ? $data : '');
}
// Format array as CSV and write to file pointer
fputcsv($file, $table_column_data, ",", '"');
}
}
}