/**
  * Ejecuta la consulta
  *
  * @return	ActiveRecordResultset
  */
 public function execute()
 {
     $sqlStatement = $this->getSQLString();
     if ($this->_connection == null) {
         $this->_connection = DbPool::getConnection();
     }
     $resultResource = $this->_connection->query($sqlStatement);
     $count = $this->_connection->numRows($resultResource);
     if ($count > 0) {
         $rowObject = new ActiveRecordRow();
         $rowObject->setConnection($this->_connection);
         return new ActiveRecordResultset($rowObject, $resultResource, $sqlStatement);
     } else {
         return new ActiveRecordResultset(new stdClass(), false, $sqlStatement);
     }
 }