Having issues with incrementing a field in the database - php

Question

I've established a database full of movies which is connected to a HTML form of which the information is ported with PHP POST (Acts as a movie database).
When the user enters a search term (Either title, genre, year or classification) the PHP script search.php is handed the information.
This goes fine, however, i also have a column in my DB which is titled times_searched which has a default value of zero.
I feel like one of the big problems is i've just been staring at this file for too long and something simple is not apparent to me right now.
I'm very new to PHP and WebDev in general.
I have tried issuing a second statement to execute inside the foreach loop of the TableRow class and have tried different syntaxes and attempting to bind previous statements to new statements.
class TableRows extends RecursiveIteratorIterator
{
function __construct($it)
{
parent::__construct($it, self::LEAVES_ONLY);
}
function current()
{
return "<td style='width:150px;border:1px solid black;'>" .
parent::current()."</td>";
}
function beginChildren()
{
echo "<tr>";
}
function endChildren()
{
echo "</tr>" . "\n";
}
}
function printAssocArray($stmt)
{
foreach (new TableRows(new RecursiveArrayIterator($stmt->fetchAll()))
as $k=>$v) {
echo $v;
}
}
require 'Templates/header.php';
//DB variables
$serverName = "localhost";
$userName = "root";
$password = "";
//Post variables
$title = ($_POST['title']);
$year = ($_POST['year']);
$genre = ($_POST['genre']);
$rating = ($_POST['rating']);
if (isset($_POST['submit'])) {
try {
//Create PDO object using DB variables
$conn = new PDO(
"mysql:host=$serverName;dbname=project_db", $userName, $password
);
//Set PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo "<h3 class='center'>Connection Successful!</h3>";
if (!empty($_POST['title']) && empty($_POST['genre'])
&& empty($_POST['rating']) && empty($_POST['year'])
) {
$stmt = $conn->prepare(
"UPDATE movies SET
times_searched = times_searched + 1 WHERE id = :id;
IN (SELECT * FROM movies WHERE title LIKE '%$title%'"
);
$result = $stmt->setFetchMode(PDO::FETCH_ASSOC);
$stmt->bindValue(':id', $result['id']);
$stmt->execute();
//Use function call to print information to table using TableRows
printAssocArray($stmt);
}elseif (!empty($_POST['genre']) && empty($_POST['rating'])
&& empty($_POST['year']) && empty($_POST['title'])
) {
$stmt = $conn->prepare(
"SELECT * FROM movies WHERE genre LIKE '%$genre%'"
);
$stmt->execute();
//Collect Result in associative array
$result = $stmt->setFetchMode(PDO::FETCH_ASSOC);
//Use function call to print information to table using TableRows
printAssocArray($stmt);
}
//New Block
if (!empty($_POST['title']) && empty($_POST['genre'])
&& empty($_POST['rating']) && empty($_POST['year'])
) {
$updateQuery = "UPDATE movies SET times_searched = times_searched + 1
WHERE id IN (SELECT id FROM movies WHERE title LIKE :title)";
$stmt = $conn->prepare($updateQuery);
$stmt->bindValue(':title', "%{$title}%");
$stmt->execute();
$outputQuery = "SELECT * FROM movies WHERE title LIKE :title";
$stmt2 = $conn->prepare($outputQuery);
$stmt2->bindValue(':title', "%{$title}%");
$data = $stmt2->fetchAll(PDO::FETCH_ASSOC);
foreach ($data as $row) {
foreach ($row as $v) {
echo $v, " ";
}
echo "<br>",\n;
}
The aim is to try and return the requested query from the database then increment the times_searched column before printing it using the TableRow Class, this should happen each time the query is run (if the page is refreshed the times_searched column should increment)
This is being used for completion of a homework project, and security is not nessacarily a factor (though use of PDO was requested).

Answer 1

Your query should either use WHERE id = :id (single movie item) or WHERE id IN (SELECT id FROM movies WHERE title LIKE '%$title%') (multiple movie items), not both, not separated by a ;.
I assume you want to use the latter (update multiple movie items), change
$stmt = $conn->prepare(
"UPDATE movies SET
times_searched = times_searched + 1 WHERE id = :id;
IN (SELECT * FROM movies WHERE title LIKE '%$title%'"
);
$result = $stmt->setFetchMode(PDO::FETCH_ASSOC);
$stmt->bindValue(':id', $result['id']);
$stmt->execute();
to
$stmt = $conn->prepare("UPDATE movies SET times_searched = times_searched + 1 WHERE id IN (SELECT id FROM movies WHERE title LIKE :title)");
$stmt->bindValue(':title',"%{$title}%");
$stmt->execute();
For the // New Block part:
Replace
$outputQuery = "SELECT * FROM movies WHERE title LIKE '%title%'";
$stmt2 = $conn->prepare($outputQuery);
$stmt2->bindValue('title', $title);
with
$outputQuery = "SELECT * FROM movies WHERE title LIKE :title";
$stmt2 = $conn->prepare($outputQuery);
$stmt2->bindValue(':title', "%{$title}%");