try to run migration for mysql and postgres

appinfo/preupdate.php

@@ -0,0 +1,17 @@
+<?php
+/**
+ * ownCloud - News
+ *
+ * This file is licensed under the Affero General Public License version 3 or
+ * later. See the COPYING file.
+ *
+ * @author Bernhard Posselt <dev@bernhard-posselt.com>
+ * @copyright Bernhard Posselt 2015
+ */
+
+namespace OCA\News\AppInfo;
+
+use OCA\News\Upgrade\Upgrade;
+
+$app = new Application();
+$app->getContainer()->query(Upgrade::class)->preUpgrade();

tests/unit/upgrade/UpgradeTest.php

@@ -22,18 +22,27 @@ class UpgradeTest extends \PHPUnit_Framework_TestCase {
     /** @var  IConfig */
     private $config;
 
+    /** @var  IDBConnection */
+    private $db;
+
     public function setUp() {
         $this->config = $this->getMockBuilder(
             '\OCP\IConfig')
             ->disableOriginalConstructor()
             ->getMock();
 
+        $this->db = $this->getMockBuilder(
+            '\OCP\IDBConnection')
+            ->disableOriginalConstructor()
+            ->getMock();
+
         $this->service = $this->getMockBuilder(
             '\OCA\News\Service\ItemService')
             ->disableOriginalConstructor()
             ->getMock();
 
-        $this->upgrade = new Upgrade($this->config, $this->service, 'news');
+        $this->upgrade = new Upgrade($this->config, $this->service,
+            $this->db, 'news');
     }
 
     public function testUpgrade() {

upgrade/upgrade.php

@@ -13,6 +13,7 @@ namespace OCA\News\Upgrade;
 
 use OCP\IConfig;
 use OCA\News\Service\ItemService;
+use OCP\IDBConnection;
 
 class Upgrade {
 
@@ -23,6 +24,10 @@ class Upgrade {
     private $itemService;
 
     private $appName;
+    /**
+     * @var IDBConnection
+     */
+    private $db;
 
     /**
      * Upgrade constructor.
@@ -30,10 +35,11 @@ class Upgrade {
      * @param $appName
      */
     public function __construct(IConfig $config, ItemService $itemService,
-                                $appName) {
+                                IDBConnection $db, $appName) {
         $this->config = $config;
         $this->appName = $appName;
         $this->itemService = $itemService;
+        $this->db = $db;
     }
 
     public function upgrade() {
@@ -46,4 +52,20 @@ class Upgrade {
         }
     }
 
+    public function preUpgrade() {
+        $previousVersion = $this->config->getAppValue(
+            $this->appName, 'installed_version'
+        );
+
+        $dbType = $this->config->getSystemValue('dbtype');
+        if (version_compare($previousVersion, '8.2.2', '<') &&
+            $dbType !== 'sqlite3'
+        ) {
+            $sql = 'ALTER TABLE `*PREFIX*news_feeds` DROP COLUMN 
+                      `last_modified`';
+            $query = $this->db->prepare($sql);
+            $query->execute();
+        }
+    }
+
 }