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<?php
class MyPluginPlugin extends Plugin {

    ...

    public function install() {
        #
        # TODO: Place installation logic here
        #
    }
}
?>

<?php 
class MyPluginPlugin extends Plugin { 

    ... 

    public function uninstall($plugin_id, $last_instance) {
        #
        # TODO: Place uninstallation logic here 
        #
    } 
} 
?>

<?php
class MyPluginPlugin extends Plugin {

    ...

    public function upgrade($current_version) {
        #
        # TODO: Place upgrade logic here
        #
    }

}
?>

<?php
class MyPluginPlugin extends Plugin {

    public function __construct() {
        Loader::loadComponents($this, array("Input"));
    }

    ...

    public function upgrade($current_version) {
        // Ensure new version is greater than installed version
        if (version_compare($this->version, $current_version) < 0) {
            $this->Input->setErrors(array(
                'version' => array(
                    'invalid' => "Downgrades are not allowed."
                )
            );
            return;
        }
    }
}
?>