<?php

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2017, 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 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
 * @license	http://opensource.org/licenses/MIT	MIT License
 * @link	https://codeigniter.com
 * @since	Version 2.1.0
 * @filesource
 */
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * PDO Result Class
 *
 * This class extends the parent result class: CI_DB_result
 *
 * @package		CodeIgniter
 * @subpackage	Drivers
 * @category	Database
 * @author		EllisLab Dev Team
 * @link		https://codeigniter.com/user_guide/database/
 */
class CI_DB_pdo_result extends CI_DB_result {

    /**
     * Number of rows in the result set
     *
     * @return	int
     */
    public function num_rows() {
        if (is_int($this->num_rows)) {
            return $this->num_rows;
        } elseif (count($this->result_array) > 0) {
            return $this->num_rows = count($this->result_array);
        } elseif (count($this->result_object) > 0) {
            return $this->num_rows = count($this->result_object);
        } elseif (($num_rows = $this->result_id->rowCount()) > 0) {
            return $this->num_rows = $num_rows;
        }

        return $this->num_rows = count($this->result_array());
    }

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

    /**
     * Number of fields in the result set
     *
     * @return	int
     */
    public function num_fields() {
        return $this->result_id->columnCount();
    }

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

    /**
     * Fetch Field Names
     *
     * Generates an array of column names
     *
     * @return	bool
     */
    public function list_fields() {
        $field_names = array();
        for ($i = 0, $c = $this->num_fields(); $i < $c; $i++) {
            // Might trigger an E_WARNING due to not all subdrivers
            // supporting getColumnMeta()
            $field_names[$i] = @$this->result_id->getColumnMeta($i);
            $field_names[$i] = $field_names[$i]['name'];
        }

        return $field_names;
    }

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

    /**
     * Field data
     *
     * Generates an array of objects containing field meta-data
     *
     * @return	array
     */
    public function field_data() {
        try {
            $retval = array();

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

                $retval[$i] = new stdClass();
                $retval[$i]->name = $field['name'];
                $retval[$i]->type = $field['native_type'];
                $retval[$i]->max_length = ($field['len'] > 0) ? $field['len'] : NULL;
                $retval[$i]->primary_key = (int) (!empty($field['flags']) && in_array('primary_key', $field['flags'], TRUE));
            }

            return $retval;
        } catch (Exception $e) {
            if ($this->db->db_debug) {
                return $this->db->display_error('db_unsupported_feature');
            }

            return FALSE;
        }
    }

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

    /**
     * Free the result
     *
     * @return	void
     */
    public function free_result() {
        if (is_object($this->result_id)) {
            $this->result_id = FALSE;
        }
    }

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

    /**
     * Result - associative array
     *
     * Returns the result set as an array
     *
     * @return	array
     */
    protected function _fetch_assoc() {
        return $this->result_id->fetch(PDO::FETCH_ASSOC);
    }

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

    /**
     * Result - object
     *
     * Returns the result set as an object
     *
     * @param	string	$class_name
     * @return	object
     */
    protected function _fetch_object($class_name = 'stdClass') {
        return $this->result_id->fetchObject($class_name);
    }

}
