diff --git a/DataStorage/Database/Connection/ConnectionAbstract.php b/DataStorage/Database/Connection/ConnectionAbstract.php
index 378b7d986..be7dc2f82 100644
--- a/DataStorage/Database/Connection/ConnectionAbstract.php
+++ b/DataStorage/Database/Connection/ConnectionAbstract.php
@@ -101,7 +101,7 @@ abstract class ConnectionAbstract implements ConnectionInterface
     /**
      * {@inheritdoc}
      */
-    public function getType() : int
+    public function getType() : string
     {
         return $this->type;
     }
diff --git a/DataStorage/Database/Connection/ConnectionFactory.php b/DataStorage/Database/Connection/ConnectionFactory.php
index acdea26ce..e44cfc6b5 100644
--- a/DataStorage/Database/Connection/ConnectionFactory.php
+++ b/DataStorage/Database/Connection/ConnectionFactory.php
@@ -57,12 +57,11 @@ class ConnectionFactory
      */
     public static function create(array $dbdata) : ConnectionInterface
     {
-        // todo: replace string with enum
         switch ($dbdata['db']) {
-            case 'mysql':
+            case DatabaseType::MYSQL:
                 return new MysqlConnection($dbdata);
                 break;
-            case 'mssql':
+            case DatabaseType::SQLSRV:
                 return new SqlServerConnection($dbdata);
                 break;
             default:
diff --git a/DataStorage/Database/DatabaseType.php b/DataStorage/Database/DatabaseType.php
index f59f81657..f7b3ff614 100644
--- a/DataStorage/Database/DatabaseType.php
+++ b/DataStorage/Database/DatabaseType.php
@@ -34,9 +34,9 @@ use phpOMS\Datatypes\Enum;
  */
 abstract class DatabaseType extends Enum
 {
-    /* public */ const MYSQL = 0; /* MySQL */
-    /* public */ const SQLITE = 1; /* SQLITE */
+    /* public */ const MYSQL = 'mysql'; /* MySQL */
+    /* public */ const SQLITE = 'sqlite'; /* SQLITE */
     /* public */ const PGSQL = 2; /* PostgreSQL */
     /* public */ const ORACLE = 3; /* Oracle */
-    /* public */ const SQLSRV = 4; /* Microsoft SQL Server */
+    /* public */ const SQLSRV = 'mssql'; /* Microsoft SQL Server */
 }