สอบถามการใช้ cakephp กับ database ค่ะ ว่าใช้งานอย่างไร

// MyModel.php in Models Folder

Class MyModel extends AppModel
{
    public function getdata($val1,$val2) 
   {
       $sql = mysql_query("select * from tb1 inner join tb2 on tb1.id = tb2.id where xxx=$val1 or xxy=$val2");
       $data = array();
       while($rows = mysql_fetch_array($sql)){
           $data[] = $rows;
      }
       return $data;
   }
}

// MyController.php in Controllers Folder

Class MyController extends AppController
{
    public function MyView($val1="",$val2="")
   {
      $this->loadModel('MyModel');

      $data['mydata'] = $this->MyModel->getdata($val1, $val2);
   }
}

// MyView.php  in Views Folder
<?php

var_dump($mydata);
?>