Insert query not inserting in database - php

Question

So I'm trying to insert some text into a already existing table. If I insert the text into the text field and press submit, I'll get a var_dump on a other page that shows the information that I want to insert but it doesnt send it to the database or something. I hope you can help me with what I'm doing wrong.
This is my insert query
public function insertComment($commentaar, $idBestelling){
try{
$stmt = $this->_db->prepare('UPDATE `apotheek`.`Bestelling` SET `commentaar` = :commentaar WHERE `Bestelling`.`idBestelling` = :idBestelling;');
if($stmt->execute(array(
':commentaar' => $commentaar,
':idBestelling' => $idBestelling))){
return true;
} else {
return false;
}
} catch(PDOException $e) {
echo '<p class="bg-danger">'.$e->getMessage().'</p>';
}
}
And here you can find the code from the webpage.
<div class="row">
<form role="form" method="post" action="/?content=bezorgen">
<div class="col-xs-12 col-sm-12 col-md-12 loginborder">
<h2 class="loginhead">Bestelling no. <?php print($data['idBestelling']); ?> <?php ($data['isSpoed'] == '0') ? print('') : print('deze bestelling is met SPOED') ?></h2>
<hr>
<div class="row col-6 col-md-6 col-sm-12 col-xs-12">
<div class="loginhead">
<h3>Commentaar</h3>
<hr>
</div>
<div>
<textarea rows="9" cols="74" name="commentaar"><?php print($data['commentaar']); ?></textarea>
</div>
</div>
<div class="row registerbtn">
<div class="col-xs-12 col-md-12" style="text-align:right;"><input type="submit" name="submit" value="Verstuur" class="btn btn-lg" tabindex="5"></div>
</div>
</div>
</form>
And the php
$data = $user->getBestellingPatient($_POST['idBestelling']);
if(isset($_POST['submit'])){
$user->insertComment($_POST['commentaar'], $_POST['idBestelling']);
};

Answer 1

I think you are trying to update a comment which is already exist in the database.
You should add a hidden field in the form to hold the id of the the post (Mostly auto incremented id from DB)
Add the below element below your textarea element
<input type='hidden' name='idBestelling'<?php print($data['idBestelling']); ?>/>
So when you are updating id will be passed as a part of the form then you can receive it usinig $_POST

Answer 2

you should try this:
$stmt = $this->_db->query('UPDATE `apotheek`.`Bestelling` SET `commentaar` = :commentaar WHERE `Bestelling`.`idBestelling` = :idBestelling;');