uninstall.inc.php

<?php
$myself = 'multinewsletter';
$myself_path = $REX['INCLUDE_PATH'] . '/addons/multinewsletter';
// append lang file
$I18N->appendFile($myself_path . '/lang/');

// Modul Aktion ID holen
$result_action = new rex_sql();
$query_action = "SELECT id FROM ". $REX['TABLE_PREFIX'] ."action WHERE createuser = 'Multinewsletter Addon Installer'";
$result_action -> setQuery($query_action);
$num_rows_action = $result_action -> getRows();

$aktionen_ids = [];
for($i = 0; $i < $num_rows_action; $i++) {
	$aktionen_ids[] = $result_action -> getValue("id");
	$result_action -> next();
}

// Verknüpfung Aktion und Modul löschen
foreach($aktionen_ids as $aktionen_id) {
	$result_anmeldung_action = new rex_sql();
	$query_anmeldung_action = "DELETE FROM ". $REX['TABLE_PREFIX'] ."module_action WHERE action_id = ". $aktionen_id;
	$result_anmeldung_action -> setQuery($query_anmeldung_action);
}

// Aktion löschen
$result_action = new rex_sql();
$query_action = "DELETE FROM ". $REX['TABLE_PREFIX'] ."action WHERE createuser = 'Multinewsletter Addon Installer'";
$result_action -> setQuery($query_action);

// Module löschen
$result_modul = new rex_sql();
$query_modul = "DELETE FROM ". $REX['TABLE_PREFIX'] ."module WHERE createuser = 'Multinewsletter Addon Installer'";
$result_modul -> setQuery($query_modul);

$messages[] = $I18N->msg('multinewsletter_uninstall_modules_deleted');

$REX['ADDON']['install'][$myself] = 0;