try {
            db_vertices = db.zrange(elementCollectionKey, current, current);
            long id = Long.parseLong(new String(db_vertices.get(0)));
            if(type.equals(RedisElementType.TYPE.REDIS_ELEMENT_VERTEX)){
                el = new RedisVertex(id, graph);
            }
            else{
                el = new RedisEdge(id, graph);
                if(null != this.label && !((RedisEdge)el).getLabel().equals(this.label)){
                    el = null;