Magento – How to save different fieldset value in single table in magento

I have created custom module with form in admin side. In a form, I have created two fieldset:

$fieldset = $form->addFieldset('base_fieldset', array(
    'legend'    => Mage::helper('checkout')->__('Baz Information'),
    'class'     => 'fieldset-wide',
));
$fieldsetdate = $form->addFieldset('date', array(
   'legend'    => Mage::helper('checkout')->__('Date Range'),
   'class'     => 'fieldset-date',
));

$fieldset's attribute values are stored in my DB table. But $fieldsetdate's attribute values are not saved. I dunno how to manage different fieldset attributes in a single form. Do I need to use two different custom table?

EDIT

 // Bazcontroller.php


<?php
 class Foo_Bar_Adminhtml_BazController extends Mage_Adminhtml_Controller_Action
  {
  public function indexAction()
   {  
    // Let's call our initAction method which will set some basic params for each   action
     $this->_initAction()
        ->renderLayout();
}  

public function newAction()
{  
    // We just forward the new action to a blank edit form
    $this->_forward('edit');

}  

public function editAction()
{  
    $this->_initAction();



    // Get id if available
    $id  = $this->getRequest()->getParam('id');
    $model = Mage::getModel('foo_bar/baz');

    if ($id) {
        // Load record
        $model->load($id);


        // Check if record is loaded
        if (!$model->getId()) {
            Mage::getSingleton('adminhtml/session')->addError($this->__('This baz no longer exists.'));
            $this->_redirect('*/*/');

            return;
        }  
    }  

    $this->_title($model->getId() ? $model->getName() : $this->__('New Baz'));

    $data = Mage::getSingleton('adminhtml/session')->getBazData(true);
    if (!empty($data)) {
        $model->setData($data);
    }  

    Mage::register('foo_bar', $model);

    $this->_initAction()
        ->_addBreadcrumb($id ? $this->__('Edit Baz') : $this->__('New Baz'), $id ? $this->__('Edit Baz') : $this->__('New Baz'))
        ->_addContent($this->getLayout()->createBlock('foo_bar/adminhtml_baz_edit')->setData('action', $this->getUrl('*/*/save')))
         ->_addLeft($this->getLayout()->createBlock('foo_bar/adminhtml_baz_edit_tabs'))
        ->renderLayout();
}

public function saveAction()
{
    Zend_Debug::debug($this->getRequest()->getPost());
    if ($postData = $this->getRequest()->getPost()) {

        /// ---START code for save image attribute----
        if($_FILES['fileinputname']['name'] != '') {

try {    
     $uploader = new Varien_File_Uploader('fileinputname');
     $uploader->setAllowedExtensions(array('jpg','jpeg','gif','png'));
     $uploader->setAllowRenameFiles(false);
     $uploader->setFilesDispersion(false);

     $path = Mage::getBaseDir('media').'/foo/';
    // move_uploaded_file( $_FILES['userFile']['tmp_name'], $path);
     $uploader->save($path, $_FILES['fileinputname']['name']);
     }
     catch (Exception $e) {
     echo 'Error Message: '.$e->getMessage();
}
}
if($_FILES['fileinputname1']['name'] != ''){
     try {
     $uploader_cat = new Varien_File_Uploader('fileinputname1');
     $uploader_cat->setAllowedExtensions(array('jpg','jpeg','gif','png'));
     $uploader_cat->setAllowRenameFiles(false);
     $uploader_cat->setFilesDispersion(false);

      $uploader_cat->save($path, $_FILES['fileinputname1']['name']);
} catch (Exception $e) {
     echo 'Error Message: '.$e->getMessage();
}

$postData['fileinputname'] = Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_MEDIA).'foo/' .$_FILES['fileinputname']['name'];
$postData['fileinputname1'] = Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_MEDIA).'foo/' .$_FILES['fileinputname1']['name'];

//$data['popup_image'] = Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_MEDIA) . 'p_gallery/'. $_FILES['popup_image']['name'];

  }
        // --END---
        $model = Mage::getSingleton('foo_bar/baz');
        $model->setData($postData);

        try {
            $model->save();

            Mage::getSingleton('adminhtml/session')->addSuccess($this->__('The baz has been saved.'));
            $this->_redirect('*/*/');

            return;
        }  
        catch (Mage_Core_Exception $e) {
            Mage::getSingleton('adminhtml/session')->addError($e->getMessage());
        }
        catch (Exception $e) {
            Mage::getSingleton('adminhtml/session')->addError($this->__('An error occurred while saving this baz.'));
        }

        Mage::getSingleton('adminhtml/session')->setBazData($postData);
        $this->_redirectReferer();
    }
}

public function messageAction()
{
    $data = Mage::getModel('foo_bar/baz')->load($this->getRequest()->getParam('id'));
    echo $data->getContent();
}

/**
 * Initialize action
 *
 * Here, we set the breadcrumbs and the active menu
 *
 * @return Mage_Adminhtml_Controller_Action
 */
protected function _initAction()
{
    $this->loadLayout()
        // Make the active menu match the menu config nodes (without 'children' inbetween)
        ->_setActiveMenu('catalog/foo_bar_baz')
        ->_title($this->__('Catalog'))->_title($this->__('Baz'))
        ->_addBreadcrumb($this->__('Catalog'), $this->__('Catalog'))

        ->_addBreadcrumb($this->__('Baz'), $this->__('Baz'));

    return $this;
}

/**
 * Check currently called action by permissions for current user
 *
 * @return bool
 */
protected function _isAllowed()
{
    return Mage::getSingleton('admin/session')->isAllowed('catalog/foo_bar_baz');
}
}

//baz.php ---model/baz.php

<?php
class Foo_Bar_Model_Baz extends Mage_Core_Model_Abstract
{
protected function _construct()
{  
    $this->_init('foo_bar/baz');
}  
 }