How to save different fieldset value in single table in magento?

Question

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');
}  
 }

Answer 1

the fieldsets are only a way to organize the fields visually. Thy shouldn't have an impact in saving the data from them. There shouldn't be any difference if the fields are all in one fieldset or in 10. There is something else that's preventing the fields from being saved.
If you added the table columns corresponding to the second fieldset by altering the table, you should clear the cache. Even if the cache is disabled ZF still caches the table schema.
Also make sure that the field names are the same as the column columns.
If the fields in the second fieldset are date fields maybe there is a problem with the date format you are using.
Add this in the controller on the save action

Zend_Debug::dump($this->getRequest()->getPost()) 

and see how the values are sent to the controller.