File Upload

I want to upload a file using Chtml in Yii. Table have 3 fields( id, name, attachment). In the index.php had following code.

<form>
    <?php $name='abcd'; ?>
    <?php echo CHtml::textArea('Text', '',array('maxlength' => 300, 'rows' => 4, 'cols' => 30)); ?>
    <?php  echo CHtml::button('Send', array('submit' => array('site/contact','name'=>$name)));  ?>
</form>

Controller action

public function actionContact()
        {
            $model= new Message;
            $name=$_REQUEST['name'];
            if(isset['$_REQUEST['name'])
            {
               $model->name=$name;
               $model->save();
            }
         }

I want to add file attachment to this form. How save the file name in database field and file in folder using chtml?