Developing a MVC Component/Using the database

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This tutorial is part of the Developing a Model-View-Controller (MVC) Component for Joomla!1.6 tutorial. You are encouraged to read the previous parts of the tutorial before reading this.

Using the database

Components usually manages their contents using the database. During the install/uninstall/updata phase of a component, you can execute SQL queries through the use of SQL text files.

With your favorite file manager and editor put a file admin/sql/install.mysql.utf8.sql containing:


DROP TABLE IF EXISTS `#__helloworld`;
CREATE TABLE `#__helloworld` (
  `greeting` varchar(25) NOT NULL,
   PRIMARY KEY  (`id`)
INSERT INTO `#__helloworld` (`greeting`) VALUES
	('Hello World!'),
	('Good bye World!');

This is the install file. It will be executed if your put an appropriate order in the helloworld.xml file


<?xml version="1.0" encoding="utf-8"?>
<extension type="component" version="1.6.0" method="upgrade">
	<name>Hello World!</name>
	<creationDate>November 2009</creationDate>
	<author>John Doe</author>
	<copyright>Copyright Info</copyright>
	<license>License Info</license>
	<description>Description of the Hello World component ...</description>
	<install> <!-- Runs on install -->
			<file driver="mysql" charset="utf8">sql/install.mysql.utf8.sql</file>
	<uninstall> <!-- Runs on uninstall -->
			<file driver="mysql" charset="utf8">sql/uninstall.mysql.utf8.sql</file>
	<update> <!-- Runs on update -->
			<file driver="mysql" charset="utf8">sql/update.mysql.utf8.sql</file>
	<files folder="site">
		<menu>Hello World!</menu>
		<files folder="admin">
			<!-- SQL files section -->
			<!-- tables files section -->
			<!-- models files section -->

Packaging the component

Content of your code directory

Create a compressed file of this directory or directly download the archive and install it using the extension manager of Joomla!1.6. You can add a menu item of this component using the menu manager in the backend.