Mysql.php

<?php

require_once 'Nmc/Auth/Interface.php';

class Nmc_Auth_Mysql implements Nmc_Auth_Interface
{
    protected $table;

    public function __construct( Zend_Db_Table $table )
    {
        $this->table = $table;
    }

	public function login( $user_name, $password )
	{
	    $db = $this->table->getAdapter();
	    $where = $db->quoteInto('userName=?', $user_name)
	           . ' AND '
    	       . $db->quoteInto('password=?', md5($password));
	    $data = $this->table->fetchAll($where);
		if( count( $data->toArray() ) == 0 ) {
		    throw new Nmc_Auth_Exception( 'MySQL: userName or password incorrect.');
		}

		return true;
	}
}

?>