how to get the error message when query is update or not codeigniter
I am using codeigniter library please help
I don't care about the affect row's
$ci = &get_instance();
$ci->db->where('activity_id',$activity_id);
$ci->db->update('activity',$activity_data);
if(error){
return false / or error message ;
}else{
return true;
}