class DatabaseStatementBase

class DatabaseStatementBase extends PDOStatement implements DatabaseStatementInterface {

  /**
   * Reference to the database connection object for this statement.
   *
   * The name $dbh is inherited from PDOStatement.
   *
   * @var DatabaseConnection
   */
  public $dbh;
  protected function __construct($dbh) {
    $this->dbh = $dbh;
    $this
      ->setFetchMode(PDO::FETCH_OBJ);
  }
  public function execute($args = array(), $options = array()) {
    if (isset($options['fetch'])) {
      if (is_string($options['fetch'])) {

        // Default to an object. Note: db fields will be added to the object
        // before the constructor is run. If you need to assign fields after
        // the constructor is run, see http://drupal.org/node/315092.
        $this
          ->setFetchMode(PDO::FETCH_CLASS, $options['fetch']);
      }
      else {
        $this
          ->setFetchMode($options['fetch']);
      }
    }
    $logger = $this->dbh
      ->getLogger();
    if (!empty($logger)) {
      $query_start = microtime(TRUE);
    }
    $return = parent::execute($args);
    if (!empty($logger)) {
      $query_end = microtime(TRUE);
      $logger
        ->log($this, $args, $query_end - $query_start);
    }
    return $return;
  }
  public function getQueryString() {
    return $this->queryString;
  }
  public function fetchCol($index = 0) {
    return $this
      ->fetchAll(PDO::FETCH_COLUMN, $index);
  }
  public function fetchAllAssoc($key, $fetch = NULL) {
    $return = array();
    if (isset($fetch)) {
      if (is_string($fetch)) {
        $this
          ->setFetchMode(PDO::FETCH_CLASS, $fetch);
      }
      else {
        $this
          ->setFetchMode($fetch);
      }
    }
    foreach ($this as $record) {
      $record_key = is_object($record) ? $record->{$key} : $record[$key];
      $return[$record_key] = $record;
    }
    return $return;
  }
  public function fetchAllKeyed($key_index = 0, $value_index = 1) {
    $return = array();
    $this
      ->setFetchMode(PDO::FETCH_NUM);
    foreach ($this as $record) {
      $return[$record[$key_index]] = $record[$value_index];
    }
    return $return;
  }
  public function fetchField($index = 0) {

    // Call PDOStatement::fetchColumn to fetch the field.
    return $this
      ->fetchColumn($index);
  }
  public function fetchAssoc() {

    // Call PDOStatement::fetch to fetch the row.
    return $this
      ->fetch(PDO::FETCH_ASSOC);
  }

}