--- a/classes/bfw/database/Database.php
+++ b/classes/bfw/database/Database.php
@@ -20,10 +20,16 @@
      */
     private $pdo;
 
-    private function __construct() {
+    /**
+     * Database constructor.
+     * @param null|array $cfg
+     */
+    private function __construct($cfg = null) {
         $this->logger = Logger::getLogger(__CLASS__);
 
-        $cfg = Configuration::getDataSourceProperties();
+        if ($cfg == null) {
+            $cfg = Configuration::getDataSourceProperties();
+        }
 
         $dsn = $cfg['dsn'];
         $config = $cfg['config'];
@@ -43,11 +49,12 @@
      * Definition des States: Ein Abfrageergebnis stellt solange den State des SP da, bis eine neue Abfrage
      * einen neuen State erzeugt.
      *
+     * @param null|array $cfg
      * @return Database
      */
-    public static function getInstance() {
+    public static function getInstance($cfg = null) {
         if (self::$handle == null) {
-            self::$handle = new Database();
+            self::$handle = new Database($cfg);
         }
 
         return self::$handle;
@@ -321,6 +328,14 @@
     }
 
     /**
+     * @param $sql
+     * @return int
+     */
+    public function execute($sql) {
+        return $this->pdo->exec($sql);
+    }
+
+    /**
      * @param $table
      * @param $array
      * @return int