com_ajaxdemo/site/models/colour.php

<?php
/**
* Ajax demonstration component
*
* PHP version 5.3
*
* @category  Joomla_Component
* @package   Com_Ajaxdemo
* @author    Alan Hicks <ahicks@p-o.co.uk>
* @copyright 2010-2012 Persistent Objects Ltd
* @license   GNU General Public License version 2 or later; see LICENSE.txt
*
* @link      http://p-o.co.uk/
*/

defined('_JEXEC') or die();

jimport('joomla.application.component.model');
 
/**
* Model for Ajax demonstration
*
* @category Joomla_Component
* @package	Com_Ajaxdemo
* @author   Alan Hicks <ahicks@p-o.co.uk>
* @license  GNU General Public License version 2 or later; see LICENSE.txt
*
* @link     http://p-o.co.uk/
*/
class AjaxdemoModelColour extends JModel
{

	/**
	* Retrieves the colour data
	*
	* @return stdClass containing the data from the database
	*/
	function getItem()
	{
		JLog::add(__METHOD__ . '()', JLog::ERROR, COM_AJAXDEMO);
		// Lets load the data if it doesn't already exist
		if (empty( $this->_data )) {
			$row =& $this->getTable();
			$row->load(JRequest::getVar('id',  0, '', 'int'));
			$this->_data =& $row;
		}
		if (!$this->_data) {
			$this->_data = new stdClass();
			$this->_data->id		= 0;
			$this->_data->ordering  = 0;
			$this->_data->published = 1;
			$this->_data->date	  = '';
			$this->_data->title	 = '';
			$this->_data->alias	 = '';
			$this->_data->url	 = '';
			$this->_data->material  = '';
			$this->_data->size	  = '';
			$this->_data->notes	 = '';
		}

		return $this->_data;
	}

	/**
	* Retrieves the available colours in this series
	*
	* @return mixed The return value or null if the query failed.
	*/
	public function getColours()
	{
		// Get the current ordering
		if (!$this->_data) {
			$this->getItem();
		}
		if (!$this->_data) {
			return null;
		}

		$db = JFactory::getDBO();
		$query = $db->getQuery(true);
		$query->select('id, ordering, title, thumbnail_image');
		$query->from('#__ajaxdemo_colour');
		$query->where('published = 1');
		$query->where('colour_id = ' . $this->_data->colour_id);
		$query->order('ordering asc');

		$db->setQuery($query);
		$result = $db->loadObjectList();

		return $result;
	}

	/**
	* Retrieves the previous colour data
	*
	* @return stdClass containing the data from the database
	*/
	public function getPrevColour()
	{
		// Get the current ordering
		if (!$this->_data) {
			$this->getItem();
		}
		if (!$this->_data) {
			return false;
		}

		$db = JFactory::getDBO();
		$query = $db->getQuery(true);
		$query->select('s.id, c.id as colour_id, s.ordering, s.published');
		$query->select('s.featured, s.title, s.alias, c.thumbnail_image, s.notes');
		$query->from('#__ajaxdemo_colours s');
		$query->innerjoin('#__ajaxdemo_colour c ON s.id = c.colour_id ');
		$query->where('s.published = 1');
		$query->where('c.published = 1 AND c.dflt = 1');
		$query->where(
			's.ordering < ('
			. 'SELECT a.ordering '
			. 'FROM #__ajaxdemo_colours a '
			. 'INNER JOIN #__ajaxdemo_colour b '
			. 'ON a.id = b.colour_id '
			. 'WHERE b.id = '. $this->_data->id
			. ')'
		);
		$query->order('s.ordering desc');
		$query->limit(1);

		$db->setQuery($query);
		$result = $db->loadObject();

		return $result;
	}

	/**
	* Retrieves the next colour data
	*
	* @return stdClass containing the data from the database
	*/
	public function getNextColour()
	{
		// Get the current ordering
		if (!$this->_data) {
			$this->getItem();
		}
		if (!$this->_data) {
			return false;
		}

		$db = JFactory::getDBO();
		$query = $db->getQuery(true);
		$query->select('s.id, c.id as colour_id, s.ordering, s.published');
		$query->select('s.featured, s.title, s.alias, c.thumbnail_image, s.notes');
		$query->from('#__ajaxdemo_colours s');
		$query->innerjoin('#__ajaxdemo_colour c ON s.id = c.colour_id ');
		$query->where('s.published = 1');
		$query->where('c.published = 1 AND c.dflt = 1');
		$query->where(
			's.ordering > ('
			. 'SELECT a.ordering '
			. 'FROM #__ajaxdemo_colours a '
			. 'INNER JOIN #__ajaxdemo_colour b '
			. 'ON a.id = b.colour_id '
			. 'WHERE b.id = '. $this->_data->id
			. ')'
		);
		$query->order('s.ordering asc');
		$query->limit(1);

		$db->setQuery($query);
		$result = $db->loadObject();

		return $result;
	}
}