diff --git a/database.php b/database.php
index 91d4f63..d33d6cf 100644
--- a/database.php
+++ b/database.php
@@ -35,10 +35,27 @@ class mxDatabase
 
 	/**
 	 * Creates mxDatabase object
-	 * @param db_input path to the sqlite file where the credentials should be stored
+	 * @param config object which has following members:
+	 *     databaseURI: path to the sqlite file where the credentials should be stored
 	 *     or a param which can be used to connect to a database with PDO
+	 * 	   databaseUser and databasePass when authentication is required
+	 *     register_email which email does the register bot have (here used for providing lookup)
 	 */
-	function __construct($db_input, $user='', $password='') {
+	function __construct($config) {
+		if (empty($config)) {
+			throw new Exception("config is empty");
+		}
+		if (!isset($config["databaseURI"])) {
+			throw new Exception("'databaseURI' not defined");
+		}
+		$db_input = $config["databaseURI"];
+		$user = '';
+		$password = '';
+		if (isset($config["databaseUser"]) && isset($config["databasePass"])) {
+			// only use it when both are defined
+			$user = $config["databaseUser"];
+			$password = $config["databasePass"];
+		}
 		// create database file when not existent yet
 		$this->db = new PDO($db_input, $user, $password);
 		$this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
@@ -53,7 +70,8 @@ class mxDatabase
 			email TEXT,
 			verify_token TEXT,
 			admin_token TEXT,
-			request_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP)");
+			request_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+			)");
 		$this->db->exec("CREATE TABLE IF NOT EXISTS logins (
 			id SERIAL PRIMARY KEY,
 			active INT DEFAULT 1,
@@ -66,7 +84,6 @@ class mxDatabase
 			last_modified TIMESTAMP DEFAULT CURRENT_TIMESTAMP
 			)");
 		// make sure the bot is allowed to login
-		require_once("config.php");
 		if (!$this->userRegistered("register_bot")) {
 			$password = $this->addUser("Register", "Bot", "register_bot", $config["register_email"]);
 			$config["register_password"] = $password;
@@ -317,10 +334,6 @@ class mxDatabase
 }
 
 if (!isset($mx_db)) {
-	if (isset($config["databaseUser"]) && isset($config["databasePass"])) {
-		$mx_db = new mxDatabase($config["databaseURI"], $config["databaseUser"], $config["databasePass"]);
-	} else {
-		$mx_db = new mxDatabase($config["databaseURI"]);
-	}
+		$mx_db = new mxDatabase($config);
 }
 ?>