form

<?php
class App_Form_Login extends Zend_Form
{
	public function __construct()
	{
		parent::__construct($options);
		$this->setName('UserLogin');
		$username = new Zend_Form_Element_Text('username');
		$username->setLabel('User Name')
				->setRequired(true)
				->addFilter('StripTags')
				->addFilter('StringTrim')
				->addValidator('NotEmpty');
		$pass = new Zend_Form_Element_Password('pass');
		$pass->setLabel('Password')
				->setRequired(true)
				->addFilter('StripTags')
				->addFilter('StringTrim')
				->addValidator('NotEmpty');
		$submit = new Zend_Form_Element_Submit('submit');
		$redirect = new Zend_Form_Element_Hidden('redirect');
		$submit->setAttrib('id', 'submitbutton');
		$this->addElements( array ( $username, $pass, $submit));
	}
}

controller

<?php
class IndexController extends Zend_Controller_Action {
    public function init() {
    }

    public function indexAction() {
        $this->view->mainourbank='yes';
    }

    public function loginAction() {
        $this->_helper->layout->disableLayout();
        $loginForm = new App_Form_Login();
        $redirect = $this->getRequest()->getParam('redirect', 'index/view');
        $loginForm->setAttrib('redirect', $redirect );
        $auth = Zend_Auth::getInstance();
        if(Zend_Auth::getInstance()->hasIdentity()) {
            $this->_redirect('/index/view');
        } else if ($this->getRequest()->isPost()) {
               if ( $loginForm->isValid($this->getRequest()->getPost()) ) {
                    $username = $this->getRequest()->getPost('username');
                    $pwd = $this->getRequest()->getPost('pass');
                    $authAdapter = new App_Model_AuthAdapter($username, $pwd);
                    $result = $auth->authenticate($authAdapter);
                        if(!$result->isValid()) {
                            switch ($result->getCode()) {
                            case Zend_Auth_Result::FAILURE_CREDENTIAL_INVALID:
                                    $this->view->error = 'user credentials not found';
                            }
                        } else {
//                             $tre = new Acl($username,$pwd);
                            $this->_redirect( $redirect );
                }
            }
            }
        $this->view->loginForm = $loginForm;
    }

    public function viewAction() {

    }
    public function logoutAction() {
        $auth = Zend_Auth::getInstance();
        $auth->clearIdentity();
        $this->_redirect('/');
    }



}



model

<?php
class App_Model_Users extends Zend_Db_Table_Abstract
{
  /*
   * @var $_name table name : users
   */
  protected $_name = 'ourbank_userloginupdates';

  public function findCredentials($username, $pwd)
  {
    $select = $this->select()
                               ->setIntegrityCheck(false)
                               ->join(array('u' => 'ourbank_userloginupdates'),array('user_id'))
                               ->where('u.login_name = ?', $username)
                               ->where('u.password = ?',$pwd)
                                ->join(array('g'=>'ourbank_usergrants'),'u.user_id = g.user_id')
                                ->join(array('r' =>'ourbank_grant'),'r.grant_id = g.grant_id')
                                ->join(array('a' =>'ourbank_grantactivites'),'a.grant_id = r.grant_id')
                                ->join(array('c' =>'ourbank_activity'),'c.activity_id = a.activity_id');
                $result= $this->fetchRow($select);
//                 print_r($result);
// print_r($result);
// return($result);
//                 return $result->toArray();
//                 print_r($result);

    if($row) {
      /*
       * If success return the row
       */
      return $row;
    }
    return false;
//   }



}
}