mysql - Zend php can not use rowCount for affected row -

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i update row in db , check affected row not working rowcount() , mysql_affected_rows.

this code

$result = $this->_db_table->update(array('password' => $new_password), $where);

i have checked in db , changes pass when i

$affectedrows = mysql_affected_rows($result);

$affectedrows = $result->rowcount();

it's return false mysql_affected_rows , 500 error server rowcount(). test curl , ideas???

are sure content changed ? if update return 1 if actual record changed rather method being called. if no change made method return 0.

KHS