Catch db error with Doctrine\DBAL\Exception - database

Question

I want to catch any error (ie: foreign key error) from an insert statement or any other. How can I achive that with use Doctrine\DBAL\Exception?
I have this when I do the insert:
$db->beginTransaction();
try {
$db->insert('bbc5.produccionpry',$datos);
$datos['propryid'] = $db->lastInsertId();
$db->commit();
// $db = null;
$resp[] = $datos;
} catch (Exception $e) {
$error = array_merge($error, array('error' => $e->errorInfo()));
$db->rollback();
throw $e;
}
But, that doesn't prevent the concrete5 to return a website telling about the error, so, I don't want that website to be shown, I want to catch the error in an array() in order to return it via echo json_encode($error)
I'm not using the controller for a page, I'm using it for managing RESTful calls from my JavaScript App with this code:
return fetch(`/scamp/index.php/batchprodpry/${maq}`, {
method: 'POST',
credentials: 'same-origin',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json'
},
body: JSON.stringify(this.state.a)
})
I'm using ReactJS
Thank you

Answer 1

Don't throw the exception.
Instead of throwing the exception, just get the exceptions message $e->getMessage() from the DBALException $e object and encode it as a JSON string. Important: Put an exit; after the echo to assure that no further code is executed.
use Doctrine\DBAL\DBALException;
try {
$db->insert('bbc5.produccionpry',$datos);
$datos['propryid'] = $db->lastInsertId();
$db->commit();
$resp[] = $datos;
}
catch(DBALException $e){
$db->rollback();
echo \Core::make('helper/json')->encode($e->getMessage());
exit;
}
If this code is inside a page controller you could do this:
try {
$db->insert('bbc5.produccionpry',$datos);
$datos['propryid'] = $db->lastInsertId();
$db->commit();
$resp[] = $datos;
}
catch(DBALException $e){
$this->error->add($e->getMessage());
}
if($this->error->has()) {
// All variables that have been set in the view() method will be set again.
// That is why we call the view method again
$this->view();
return;
}
And concrete5 will take care of displaying an appropriate error message.
Or you could save the $e->getMesssage() in the session and call it inside the view:
$session = \Core::make('session');
// ...
catch(Exception $e){
$session->set('error', $e->getMessage());
}
And in the view:
// html
<?php
$session = \Core::make('session');
if($session->has('error')) {
$m = $session->get('error');
?>
<div id="session_error" class="alert alert-danger">
×
<div id="session_error_msg">
<?php print $m ?>
</div>
</div>
<?php
}
$session->remove('error');
?>
//html

Answer 2

Since you have throw $e in your catch block you throw this exception further which means that it is (probably) handled by global exception listener. Once you throw exception you exit your code immediately, so a solution for you is just remove throw $e line and you should be good