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<?php

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP

 *

 * This content is released under the MIT License (MIT)

 *

 * Copyright (c) 2014 - 2019, British Columbia Institute of Technology

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 *

 * @package	CodeIgniter

 * @author	EllisLab Dev Team

 * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)

 * @copyright	Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)

 * @license	https://opensource.org/licenses/MIT	MIT License

 * @link	https://codeigniter.com

 * @since	Version 1.0.0

 * @filesource

 */

defined('BASEPATH') OR exit('No direct script access allowed');

/**

 * MySQL Result Class

 *

 * This class extends the parent result class: CI_DB_result

 *

 * @category	Database

 * @author		EllisLab Dev Team

 * @link		https://codeigniter.com/user_guide/database/

 */

class CI_DB_mysql_result extends CI_DB_result {

	/**

	 * Class constructor

	 *

	 * @param	object	&$driver_object

	 * @return	void

	 */

	public function __construct(&$driver_object)

	{

		parent::__construct($driver_object);

		// Required, due to mysql_data_seek() causing nightmares

		// with empty result sets

		$this->num_rows = mysql_num_rows($this->result_id);

	}

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

	/**

	 * Number of rows in the result set

	 *

	 * @return	int

	 */

	public function num_rows()

	{

		return $this->num_rows;

	}

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

	/**

	 * Number of fields in the result set

	 *

	 * @return	int

	 */

	public function num_fields()

	{

		return mysql_num_fields($this->result_id);

	}

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

	/**

	 * Fetch Field Names

	 *

	 * Generates an array of column names

	 *

	 * @return	array

	 */

	public function list_fields()

	{

		$field_names = array();

		mysql_field_seek($this->result_id, 0);

		while ($field = mysql_fetch_field($this->result_id))

		{

			$field_names[] = $field->name;

		}

		return $field_names;

	}

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

	/**

	 * Field data

	 *

	 * Generates an array of objects containing field meta-data

	 *

	 * @return	array

	 */

	public function field_data()

	{

		$retval = array();

		for ($i = 0, $c = $this->num_fields(); $i < $c; $i++)

		{

			$retval[$i]			= new stdClass();

			$retval[$i]->name		= mysql_field_name($this->result_id, $i);

			$retval[$i]->type		= mysql_field_type($this->result_id, $i);

			$retval[$i]->max_length		= mysql_field_len($this->result_id, $i);

			$retval[$i]->primary_key	= (int) (strpos(mysql_field_flags($this->result_id, $i), 'primary_key') !== FALSE);

		}

		return $retval;

	}

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

	/**

	 * Free the result

	 *

	 * @return	void

	 */

	public function free_result()

	{

		if (is_resource($this->result_id))

		{

			mysql_free_result($this->result_id);

			$this->result_id = FALSE;

		}

	}

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

	/**

	 * Data Seek

	 *

	 * Moves the internal pointer to the desired offset. We call

	 * this internally before fetching results to make sure the

	 * result set starts at zero.

	 *

	 * @param	int	$n

	 * @return	bool

	 */

	public function data_seek($n = 0)

	{

		return $this->num_rows

			? mysql_data_seek($this->result_id, $n)

			: FALSE;

	}

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

	/**

	 * Result - associative array

	 *

	 * Returns the result set as an array

	 *

	 * @return	array

	 */

	protected function _fetch_assoc()

	{

		return mysql_fetch_assoc($this->result_id);

	}

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

	/**

	 * Result - object

	 *

	 * Returns the result set as an object

	 *

	 * @param	string	$class_name

	 * @return	object

	 */

	protected function _fetch_object($class_name = 'stdClass')

	{

		return mysql_fetch_object($this->result_id, $class_name);

	}

}