Adding another JOIN to query and getting table column titles - php

Question

I am working on a data to CSV function but I'm stuck.
So far it's getting all data from two tables and putting onto a CSV file all in 1 line for each order with invoice data and customer data .
I need to also get invoice_items by ID as well (those I guess will need to be looped as might have more than 1 item but unsure how to add invoice_items to the query and also I need to set the titles as well for the columns but unsure how).
It would be awesome if it could be like this:
|invoice details customer details | invoice items
LIST ITEM
LIST ITEM
LIST ITEM
rather than
invoice details | customer details | invoice items LIST ITEM LIST ITEM
LIST ITEM
with real data and titles would look something like
id | invoice number | amount | name | address | invoice items (and
list below this part)
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, ",", '"');
}
}

Answer 1

If I understand you correctly, you need to join to another table to get the invoice items.
I also suspect that your current example query is joining the tables incorrectly, as you appear to be joining the customers and invoices tables based on the invoice. As I expect a customer could have many invoices, but an invoice only has one customer I would expect the invoice table to store the relevant customer id, and then do a join based on that.
As such you could get the details with something like this:-
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
Note I have switched from SELECT * to selecting the column names (which I am guessing at), as SELECT * is frowned upon for various reasons. You could alias the column names if you wanted something more readable.
But you want a list of titles taken from the column names. Assuming you do not want to just hardcode these I would suggest that you switch from using mysqli_fetch_row to mysqli_fetch_assoc, which will return the column names.
You can then process the column names on the first row and output those. Something like this:-
<?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, $table_column_data, ",", '"');
}
}
}
Expanding that a bit to only put out the invoice details on the first row for an invoice
<?php
header("Content-type: text/csv");
// output any connection error
if ($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, ",", '"');
}
}
}