public function exe()
 {
     DBConnector::set_db('neointelperu_apps2');
     DBConnector::$results = NULL;
     if ($this->fields == NULL) {
         DBConnector::ejecutar($this->sql, $this->data);
     } else {
         DBConnector::ejecutar($this->sql, $this->data, $this->fields);
     }
     return DBConnector::$results;
 }