zend framework count the number of rows in mysql query -

i new zend framework

i want calculate number of rows in query

this code:

$nm = new zend_db_table('emp'); $row = $nm->fetchrow($nm->select()->where('id= ?', $a));   

yes can try in way total number of rows return sql query.

$select = $this->select();  $select->where('id= ?', $a);  $result=$this->fetchall($select);  if(empty($result)){     return false; }else{         echo "total number of users : -> ".count($result->toarray()); }  

let me know if can more.