PHP mysql query doesn't work - php

Question

This is the query code:
if (isset($_POST['moduleAction']) && ($_POST['moduleAction'] == 'edit')) {
$date = date('Y-m-d H:i:s', time());
$stmt = $db->prepare('UPDATE todolist SET what = ?, priority = ?, added_on = ? WHERE id = ?');
$stmt->execute(array($what, $priority + 1, $date, $id));
}
My db connection:
<?php
try {
$db = new PDO('mysql:host=' . DB_HOST .';dbname=' . DB_NAME . ';charset=utf8mb4', DB_USER, DB_PASS);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
} catch (Exception $e) {
showDbError('connect', $e->getMessage());
}
The query is not executed on the db, on another page in the same document i am executing queries to the same db without problem. I've tried executing it without a prepared statement, double quotes, restarting te connection,... nothing works.
Anyone who can push me in the right direction?
EDIT
Setting variables:
$priorities = array('low','normal','high'); // The possible priorities of a todo
$formErrors = array(); // The encountered form errors
$id = isset($_GET['id']) ? (int) $_GET['id'] : 0; // The passed in id of the todo
$what = isset($_POST['what']) ? $_POST['what'] : ''; // The todo that was sent in via the form
$priority = isset($_POST['priority']) ? $_POST['priority'] : 'low'; // The priority that was sent in via the form

Answer 1

You should always check for errors, there is so many reason an query fail to work as expected.
Here is the right way to check:
if(isset($_POST['moduleAction']) && ($_POST['moduleAction'] == 'edit')) {
$date = date('Y-m-d H:i:s', time());
$query ='UPDATE todolist SET what = ?, priority = ?, added_on = ? WHERE id = ?';
if($stmt = $db->prepare($query)){
if($stmt->execute(array($what, $priority + 1, $date, $id))){
echo 'execute() successful';
if($stmt->rowCount() > 0){
echo 'Affected a row';
}else{
echo 'No row affected';
}
}else{
echo 'execute() error:';
die($dbh->errorInfo());
}
}else{
echo 'prepare() error:';
die($dbh->errorInfo());
}
}
Edit
One more thing, $priority + 1 seem a little weird.
After your update I see this line:
$priority = isset($_POST['priority']) ? $_POST['priority'] : 'low';
so you try to increment a string by 1?
Anyway what happened to traditional debugging ?
$sql_debug = "UPDATE todolist
SET what = '$what', priority = '$priority', added_on = '$date'
WHERE id = $id";
echo "**************************************<br>";
echo $sql_debug."<br>";
echo "**************************************<br>";
error_log('sql = '.$sql_debug);
Take a look at the query
And run to see what happens

Answer 2

I think update query is correct,please check the date time format,try this code
if (isset($_POST['moduleAction']) && ($_POST['moduleAction'] == 'edit')) {
$date=date_create("2014-10-09");
date_time_set($date,13,24,46);
$datetime =date_format($date,"Y-m-d H:i:s");
$stmt = $db->prepare('UPDATE todolist SET what = ?, priority = ?, added_on = ? WHERE id = ?');
$stmt->execute(array($what, $priority + 1, $datetime, $id));
}

Answer 3

If your query is not execute and you get no error I would say that something is wrong with this
if(isset($_POST['moduleAction']) && ($_POST['moduleAction'] == 'edit')) {
Make sure your moduleAction is set in your post array and is really egal to 'edit'.
Hope this helps