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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 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;

	}

}