اضافه کردن model

<?php
// No direct access to this file
defined('_JEXEC') or die('Restricted access');
 
// import Joomla view library
jimport('joomla.application.component.view');
 
/**
 * HTML View class for the HelloWorld Component
 */
class HelloWorldViewHelloWorld extends JView
{
        // Overwriting JView display method
        function display($tpl = null) 
        {
                // Assign data to the view
                $this->msg = $this->get('Msg');
 
                // Check for errors.
                if (count($errors = $this->get('Errors'))) 
                {
                        JLog::add(implode('<br />', $errors), JLog::WARNING, 'jerror');
                        return false;
                }
                // Display the view
                parent::display($tpl);

<?php
// No direct access to this file
defined('_JEXEC') or die('Restricted access');
 
// import Joomla modelitem library
jimport('joomla.application.component.modelitem');
 
/**
 * HelloWorld Model
 */
class HelloWorldModelHelloWorld extends JModelItem
{
        /**
         * @var string msg
         */
        protected $msg;
 
        /**
         * Get the message
         * @return string The message to be displayed to the user
         */
        public function getMsg() 
        {
                if (!isset($this->msg)) 
                {
                        $this->msg = 'Hello World!';
                }
                return $this->msg;
        }
}

<?xml version="1.0" encoding="utf-8"?>
<!-- $Id: helloworld.xml 14 2009-11-02 18:35:20Z chdemko $ -->
<extension type="component" version="1.6.0" method="upgrade">

    <name>Hello World!</name>
    <!-- The following elements are optional and free of formatting conttraints -->
    <creationDate>November 2009</creationDate>
    <author>beyamooz</author>
    <authorEmail>این آدرس ایمیل توسط spambots حفاظت می شود. برای دیدن شما نیاز به جاوا اسکریپت دارید</authorEmail>
    <authorUrl>https://beyamooz.com</authorUrl>
    <copyright>Copyright Info</copyright>
    <license>License Info</license>
    <!--  The version string is recorded in the components table -->
    <version>0.0.4</version>
    <!-- The description is optional and defaults to the name -->
    <description>آموزش کامپوننت نویسی در جوملا- https://beyamooz.com</description>

    <update> <!-- Runs on update; New in 1.6 -->
        <schemas>
            <schemapath type="mysql">sql/updates/mysql</schemapath>
        </schemas>
    </update>

    <!-- Site Main File Copy Section -->
    <!-- Note the folder attribute: This attribute describes the folder
        to copy FROM in the package to install therefore files copied
        in this section are copied from /site/ in the package -->
    <files folder="site">
        <filename>index.html</filename>
        <filename>helloworld.php</filename>
        <filename>controller.php</filename>
        <folder>views</folder>
        <folder>models</folder>
    </files>

    <administration>
        <!-- Administration Menu Section -->
        <menu>Hello World!</menu>
        <!-- Administration Main File Copy Section -->
        <!-- Note the folder attribute: This attribute describes the folder
            to copy FROM in the package to install therefore files copied
            in this section are copied from /admin/ in the package -->
        <files folder="admin">
            <!-- Admin Main File Copy Section -->
            <filename>index.html</filename>
            <filename>helloworld.php</filename>
            <!-- SQL files section -->
            <folder>sql</folder>
        </files>
    </administration>

</extension>