Subversion-Projekte lars-tiefland.ci

<?php
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP
 *
 * This content is released under the MIT License (MIT)
 *
 * Copyright (c) 2014 - 2018, 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 - 2018, British Columbia Institute of Technology (http://bcit.ca/)
 * @license     http://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 Utility Class
 *
 * @category    Database
 * @author              EllisLab Dev Team
 * @link                https://codeigniter.com/user_guide/database/
 */
class CI_DB_mysql_utility extends CI_DB_utility {

        /**
         * List databases statement
         *
         * @var string
         */
        protected $_list_databases      = 'SHOW DATABASES';

        /**
         * OPTIMIZE TABLE statement
         *
         * @var string
         */
        protected $_optimize_table      = 'OPTIMIZE TABLE %s';

        /**
         * REPAIR TABLE statement
         *
         * @var string
         */
        protected $_repair_table        = 'REPAIR TABLE %s';

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

        /**
         * Export
         *
         * @param       array   $params Preferences
         * @return      mixed
         */
        protected function _backup($params = array())
        {
                if (count($params) === 0)
                {
                        return FALSE;
                }

                // Extract the prefs for simplicity
                extract($params);

                // Build the output
                $output = '';

                // Do we need to include a statement to disable foreign key checks?
                if ($foreign_key_checks === FALSE)
                {
                        $output .= 'SET foreign_key_checks = 0;'.$newline;
                }

                foreach ( (array) $tables as $table)
                {
                        // Is the table in the "ignore" list?
                        if (in_array($table, (array) $ignore, TRUE))
                        {
                                continue;
                        }

                        // Get the table schema
                        $query = $this->db->query('SHOW CREATE TABLE '.$this->db->escape_identifiers($this->db->database.'.'.$table));

                        // No result means the table name was invalid
                        if ($query === FALSE)
                        {
                                continue;
                        }

                        // Write out the table schema
                        $output .= '#'.$newline.'# TABLE STRUCTURE FOR: '.$table.$newline.'#'.$newline.$newline;

                        if ($add_drop === TRUE)
                        {
                                $output .= 'DROP TABLE IF EXISTS '.$this->db->protect_identifiers($table).';'.$newline.$newline;
                        }

                        $i = 0;
                        $result = $query->result_array();
                        foreach ($result[0] as $val)
                        {
                                if ($i++ % 2)
                                {
                                        $output .= $val.';'.$newline.$newline;
                                }
                        }

                        // If inserts are not needed we're done...
                        if ($add_insert === FALSE)
                        {
                                continue;
                        }

                        // Grab all the data from the current table
                        $query = $this->db->query('SELECT * FROM '.$this->db->protect_identifiers($table));

                        if ($query->num_rows() === 0)
                        {
                                continue;
                        }

                        // Fetch the field names and determine if the field is an
                        // integer type. We use this info to decide whether to
                        // surround the data with quotes or not

                        $i = 0;
                        $field_str = '';
                        $is_int = array();
                        while ($field = mysql_fetch_field($query->result_id))
                        {
                                // Most versions of MySQL store timestamp as a string
                                $is_int[$i] = in_array(strtolower(mysql_field_type($query->result_id, $i)),
                                                        array('tinyint', 'smallint', 'mediumint', 'int', 'bigint'), //, 'timestamp'),
                                                        TRUE);

                                // Create a string of field names
                                $field_str .= $this->db->escape_identifiers($field->name).', ';
                                $i++;
                        }

                        // Trim off the end comma
                        $field_str = preg_replace('/, $/' , '', $field_str);

                        // Build the insert string
                        foreach ($query->result_array() as $row)
                        {
                                $val_str = '';

                                $i = 0;
                                foreach ($row as $v)
                                {
                                        // Is the value NULL?
                                        if ($v === NULL)
                                        {
                                                $val_str .= 'NULL';
                                        }
                                        else
                                        {
                                                // Escape the data if it's not an integer
                                                $val_str .= ($is_int[$i] === FALSE) ? $this->db->escape($v) : $v;
                                        }

                                        // Append a comma
                                        $val_str .= ', ';
                                        $i++;
                                }

                                // Remove the comma at the end of the string
                                $val_str = preg_replace('/, $/' , '', $val_str);

                                // Build the INSERT string
                                $output .= 'INSERT INTO '.$this->db->protect_identifiers($table).' ('.$field_str.') VALUES ('.$val_str.');'.$newline;
                        }

                        $output .= $newline.$newline;
                }

                // Do we need to include a statement to re-enable foreign key checks?
                if ($foreign_key_checks === FALSE)
                {
                        $output .= 'SET foreign_key_checks = 1;'.$newline;
                }

                return $output;
        }

}