What ensure that this is an zend_db error, that when I tries to pass array of values as following it works:

Case 1: Not work and exception appear

$data = array('lastresettime' => time(),
'verifiedflag' => '0',
'resetcount' => 'resetcount + 1');

Case 2: It works and no problem
$data = array('lastresettime' => time(),
'verifiedflag' => '0');

Got it??