/// <summary>
        /// Sucht nach einem Object in der Datenbank
        /// </summary>
        /// <param name="type">Typ des gesuchten objects</param>
        /// <param name="sql">nummer des Kopfobjects</param>
        /// <returns>Das gesuchte Object</returns>
        public static List<PlanningPosObject> select(Type type, string sql)
        {
            DatabaseManager manager;
            List<Object> res;
            List<PlanningPosObject> obj = new List<PlanningPosObject>();

            manager = new DatabaseManager();
            try
            {

                res = manager.freeSelect(type, sql);

                foreach (Object o in res)
                {
                    obj.Add(o as PlanningPosObject);
                }
            }
            finally
            {
                manager.release();
            }
            return obj;
        }