class StatementWrapperIterator

class StatementWrapperIterator extends StatementBase {
  use PdoTrait;
  
  /**
   * Constructs a StatementWrapperIterator object.
   *
   * @param \Drupal\Core\Database\Connection $connection
   *   Drupal database connection object.
   * @param object $clientConnection
   *   Client database connection object, for example \PDO.
   * @param string $query
   *   The SQL query string.
   * @param array $options
   *   Array of query options.
   * @param bool $rowCountEnabled
   *   (optional) Enables counting the rows matched. Defaults to FALSE.
   */
  public function __construct(Connection $connection, object $clientConnection, string $query, array $options, bool $rowCountEnabled = FALSE) {
    parent::__construct($connection, $clientConnection, $query, $rowCountEnabled);
    $this->clientStatement = $this->clientConnection
      ->prepare($query, $options);
    $this->setFetchMode(FetchAs::Object);
  }
  
  /**
   * Returns the client-level database PDO statement object.
   *
   * This method should normally be used only within database driver code.
   *
   * @return \PDOStatement
   *   The client-level database PDO statement.
   *
   * @throws \RuntimeException
   *   If the client-level statement is not set.
   */
  public function getClientStatement() : \PDOStatement {
    if (isset($this->clientStatement)) {
      assert($this->clientStatement instanceof \PDOStatement);
      return $this->clientStatement;
    }
    throw new \LogicException('\\PDOStatement not initialized');
  }
  
  /**
   * {@inheritdoc}
   */
  public function execute($args = [], $options = []) {
    assert(!isset($options['fetch']) || $options['fetch'] instanceof FetchAs || is_string($options['fetch']), 'The "fetch" option passed to execute() must contain a FetchAs enum case or a string. See https://www.drupal.org/node/3488338');
    if (isset($options['fetch'])) {
      if (is_string($options['fetch'])) {
        $this->setFetchMode(FetchAs::ClassObject, $options['fetch']);
      }
      else {
        $this->setFetchMode($options['fetch']);
      }
    }
    $startEvent = $this->dispatchStatementExecutionStartEvent($args ?? []);
    try {
      $return = $this->clientExecute($args, $options);
      $this->result = new PdoResult($this->fetchMode, $this->fetchOptions, $this->getClientStatement());
      $this->markResultsetIterable($return);
    } catch (\Exception $e) {
      $this->dispatchStatementExecutionFailureEvent($startEvent, $e);
      throw $e;
    }
    $this->dispatchStatementExecutionEndEvent($startEvent);
    return $return;
  }

}