Insert ID for 5 items or More - php

Question

I continued from the previous topic - 1 id for more items - that I discuss.
In that last topic, I ask about the concept and now what I'm doing is continue to coding concept.
The code successfully save the data into database, but still when insert 5 item, it submit the data per item per ID. Example :
Item 1 - Computer (Purchase No 1)
Item 2 - Mouse (Purchase No 2)
That I wanted is :
Item 1 - Computer (Purchase No 1)
Item 2 - Mouse (Purchase No 1)
and here it's my code : I using purchase no with autoincrement.
Here it's my execute code :
<?php
$conn = oci_connect("system", "dev01");
$n = $_POST['jum'];
for ($i=1; $i<=$n; $i++)
{
$dept=$_POST['dept'];
$date_request=$_POST['date_request'];
$supplier=$_POST['supplier'];
$item=$_POST['item'.$i];
$qty=$_POST['qty'.$i];
$uprice=$_POST['uprice'.$i];
$total=$_POST['total'.$i];
$s = oci_parse($conn,
"insert into purchase_request(dept_id, supplier_id, date_request, item, qty, uprice, total_amount) values ('$dept', '$supplier', '$date_request', '$item'
, '$qty', '$uprice', '$total'
)");
$r = oci_execute($s);
oci_rollback($conn);
echo "Data was committed\n";
}
?>
Any suggestions ?

Answer 1

You should follow the suggestion you marked as accepted in your earlier post, but don't make purchase ID an autoincrement field. The whole point is that it doesn't auto-increment; it goes up when you specifically want it to (so that multiple items can have the same purchase_id). This does mean you'll need to explicitly assign it a value. The simplest way would be to query for the maximum purchase id that's currently in the purchases table, and for your query, add 1 to that.