generate exceptions in implementation

DbService.cs

@@ -37,6 +37,8 @@ namespace de.hottis.genericdatabaseapiservice.Services {
             Console.WriteLine("ConnInfo: {0}", databaseConnInfo);
             Console.WriteLine("Statement: {0}", selectStatement);
             
+            throw new Exception("AetschiBaetsch");
+
             using (var conn = new MySqlConnection(databaseConnInfo)) {
                 await conn.OpenAsync();