How to fix this error on PDO statements: Invalid parameter number? - php

Question

I am trying to a PDO using the following code:
<?php
include('connection.php');
# cartexe.php will perform all actions on cart.php
// add Item to Cart
if(isset($_POST['addItemToCart']))
{
// initialize index.php variables
$productName = $_POST['productName'];
$price = $_POST['price'];
$description = $_POST['description'];
// check the cart table to see if the product has been previously added
$smtp = $conn->prepare('SELECT Quantity FROM cart WHERE Product Name = :product'); // prepare a statement to fetch the quantity for a particular product... the statement is not executed but merely prepared to do so.
$smtp->bindParam(':product', $productName, PDO::PARAM_STR); //bind the productName with whatever data supplied hence the statement after : above will be replaced with the actually data.. In additional the statement is set as string hence PDO::PRAM_STR
$smtp->execute();//finally run the statment
$result = $smtp->fetch(PDO::FETCH_NUM);
if($result > 0)
{
echo " DATA FOUND";
}
else
{
echo ' No data founded';
}
}
?>
But I keep getting the error below. I have tried several different methods but none of them worked.
Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY093]: Invalid parameter number: parameter was not defined'

Answer 1

Wrap your column name in backticks since it contains a space
WHERE `Product Name`
having used $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); right after the connection is opened, would have signaled an error.
Another option is to use an underscore between the words while renaming/altering your column to Product_Name
WHERE Product_Name ...
An insight:
Also make sure your form element is indeed named.
I.e.:
<input type="text" name="productName">
Using error reporting and placed at the top of your file(s):
error_reporting(E_ALL);
ini_set('display_errors', 1);
would signal (other) possible errors also, should it be the case.