system/database/drivers/oci8/oci8_result.php

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<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright   Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * oci8 Result Class
 *
 * This class extends the parent result class: CI_DB_result
 *
 * @category	Database
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 */
class CI_DB_oci8_result extends CI_DB_result {

	public $stmt_id;
	public $curs_id;
	public $limit_used;

	/**
	 * Number of rows in the result set.
	 *
	 * Oracle doesn't have a graceful way to retun the number of rows
	 * so we have to use what amounts to a hack.
	 *
	 * @return  integer
	 */
	public function num_rows()
	{
		if ($this->num_rows === 0 && count($this->result_array()) > 0)
		{
			$this->num_rows = count($this->result_array());
			@oci_execute($this->stmt_id);

			if ($this->curs_id)
			{
				@oci_execute($this->curs_id);
			}
		}

		return $this->num_rows;
	}

	// --------------------------------------------------------------------

	/**
	 * Number of fields in the result set