How to execute multiple SQL query to different table? - php

Question

I'm attempting to run both query to different table.
As tbl_invoice are inserted, invoice_id is created from first query (first one works) but when I put another query for tbl_invoice_details I think it doesn't actually pass the previous invoice_id value, tried with if($invoice_id != null){...} but this query doesn't seem to work for tbl_invoice_details.
Any help would be appreciated, thanks.
include_once 'connectdb.php';
$id = $_GET['id'];
$select = $pdo->prepare("SELECT * FROM tbl_product WHERE barcode=$id");
$select->execute();
$row = $select->fetch(PDO::FETCH_OBJ);
// FOR TBL_INVOICE
$variables
...
$insert = $pdo->prepare("INSERT INTO tbl_invoice(customer_name,order_date,subtotal,tax,discount,total,paid,due,payment_type,profit) values(:cust,:orderdate,:stotal,:tax,:disc,:total,:paid,:due,:ptype,:profit)");
$insert->bindParam(':cust',$customer_name);
$insert->bindParam(':orderdate',$order_date);
$insert->bindParam(':stotal',$subtotal);
$insert->bindParam(':tax',$tax);
$insert->bindParam(':disc',$discount);
$insert->bindParam(':total',$total);
$insert->bindParam(':paid',$paid);
$insert->bindParam(':due',$due);
$insert->bindParam(':ptype',$payment_type);
$insert->bindParam(':profit',$profit);
$insert->execute();
// FOR TBL_INVOICE_DETAILS
$invoice_id = $pdo->lastInsertId();
if($invoice_id != null){
$rem_qty = $stock - $qty;
$update = $pdo->prepare("UPDATE tbl_product SET pstock='$rem_qty' WHERE barcode='".$id."'");
$update->execute();
$insert = $pdo->prepare("INSERT INTO tbl_invoice_details(invoice_id,product_id,product_name,qty,price,order_date,values(:invid,:pid,me,:qty,:price,:orderdate,:profit)");
$insert->bindParam(':invid',$invoice_id);
$insert->bindParam(':pid',$pid);
$insert->bindParam(':pname',$productname);
$insert->bindParam(':qty',$qty);
$insert->bindParam(':price',$total);
$insert->bindParam(':orderdate',$order_date);
$insert->bindParam(':profit',$profit);
$insert->execute();
}
?>```

Answer 1

enable PDO error reporting:
include_once 'connectdb.php';
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$id = $_GET['id'];
when a SQL error occurs, it will get thrown as an exception. if we don't enable PDO error reporting, then the code needs to check the return from each SQL call to see if an error occurred.
The question here isn't "how to get multiple SQL query to different table". The real question is "how do I see what SQL error occurred".