Handling DB Errors using Query Builder

Hello, i need to know how to handle DB errors when using Query Builder.

I know the following can work as per how is described here

PHP Code:

if ( ! $this->db->simple_query('SELECT `example_field` FROM `example_table`'))
{
       $error = $this->db->error(); // Has keys 'code' and 'message'
} 


but how can I use it when doing something like this

PHP Code:

$data = array(
        'title' => 'My title',
        'name' => 'My Name',
        'date' => 'My date'
);
$this->db->insert('mytable', $data);