Codeigniter db queries is not capturing some specific queries - codeigniter

Question

am trying to capture all queries and record a log of interactions, however some queries are not being captured, this specific query for example:
$this->db->update('showtec.motoristas', $motorista);
I capture the queries using the Hooks function like this:
Hooks.php:
$hook['post_controller'] = array(
'class' => 'Db_query_log',
'function' => 'log_db_queries',
'filename' => 'db_log.php',
'filepath' => 'hooks'
);
db_log.php:
<?php
class Db_query_log {
function __construct() {
}
function log_db_queries() {
$CI =& get_instance();
$CI->load->model('auditoria');
$data = array();
$queries = $CI->db->queries;
$data['id_usuario_gestor'] = $CI->auth->get_login('id_user');
foreach ($queries as $query){
if (preg_match($pattern = '/' . 'INSERT' . '/', $query)){
$queryArray = explode("`", $query);
if($queryArray[3] != 'ip'){
$data['query'] = $query;
$data['clause'] = 'insert';
break;
}
}elseif (preg_match($pattern = '/' . 'UPDATE' . '/', $query)){
$data['query'] = $query;
$data['clause'] = 'update';
break;
}elseif (preg_match($pattern = '/' . 'DELETE' . '/', $query)){
$data['query'] = $query;
$data['clause'] = 'delete';
break;
}
}
if(array_key_exists('query', $data)){
$CI->auditoria->salvarAuditoria($data);
}
}
}