Mensagens de erro personalizadas do PHP Mysqli

<?php
mysqli_report(MYSQLI_REPORT_OFF); //Turn off default messages

$mysqli = new mysqli("localhost", "user", "password", "database");

$query = "SELECT * FROM Table ";
$res = $mysqli->query($query);

if ($mysqli->error) {
    try {    
        throw new Exception("MySQL error $mysqli->error <br> Query:<br> $query", $msqli->errno);    
    } catch(Exception $e ) {
        // Log your error in db or just output it
        // using $e->getMessage() to log the actual message;
        echo nl2br($e->getTraceAsString());
    }
}

?>