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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 Database Adapter Class

 *

 * Note: _DB is an extender class that the app controller

 * creates dynamically based on whether the query builder

 * class is being used or not.

 *

 * @package		CodeIgniter

 * @subpackage	Drivers

 * @category	Database

 * @author		EllisLab Dev Team

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

 */

class CI_DB_mysql_driver extends CI_DB {

	/**

	 * Database driver

	 *

	 * @var	string

	 */

	public $dbdriver = 'mysql';

	/**

	 * Compression flag

	 *

	 * @var	bool

	 */

	public $compress = FALSE;

	/**

	 * DELETE hack flag

	 *

	 * Whether to use the MySQL "delete hack" which allows the number

	 * of affected rows to be shown. Uses a preg_replace when enabled,

	 * adding a bit more processing to all queries.

	 *

	 * @var	bool

	 */

	public $delete_hack = TRUE;

	/**

	 * Strict ON flag

	 *

	 * Whether we're running in strict SQL mode.

	 *

	 * @var	bool

	 */

	public $stricton;

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

	/**

	 * Identifier escape character

	 *

	 * @var	string

	 */

	protected $_escape_char = '`';

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

	/**

	 * Class constructor

	 *

	 * @param	array	$params

	 * @return	void

	 */

	public function __construct($params)

	{

		parent::__construct($params);

		if ( ! empty($this->port))

		{

			$this->hostname .= ':'.$this->port;

		}

	}

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

	/**

	 * Non-persistent database connection

	 *

	 * @param	bool	$persistent

	 * @return	resource

	 */

	public function db_connect($persistent = FALSE)

	{

		$client_flags = ($this->compress === FALSE) ? 0 : MYSQL_CLIENT_COMPRESS;

		if ($this->encrypt === TRUE)

		{

			$client_flags = $client_flags | MYSQL_CLIENT_SSL;

		}

		// Error suppression is necessary mostly due to PHP 5.5+ issuing E_DEPRECATED messages

		$this->conn_id = ($persistent === TRUE)

			? mysql_pconnect($this->hostname, $this->username, $this->password, $client_flags)

			: mysql_connect($this->hostname, $this->username, $this->password, TRUE, $client_flags);

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

		// Select the DB... assuming a database name is specified in the config file

		if ($this->database !== '' && ! $this->db_select())

		{

			log_message('error', 'Unable to select database: '.$this->database);

			return ($this->db_debug === TRUE)

				? $this->display_error('db_unable_to_select', $this->database)

				: FALSE;

		}

		if (isset($this->stricton) && is_resource($this->conn_id))

		{

			if ($this->stricton)

			{

				$this->simple_query('SET SESSION sql_mode = CONCAT(@@sql_mode, ",", "STRICT_ALL_TABLES")');

			}

			else

			{

				$this->simple_query(

					'SET SESSION sql_mode =

					REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(

					@@sql_mode,

					"STRICT_ALL_TABLES,", ""),

					",STRICT_ALL_TABLES", ""),

					"STRICT_ALL_TABLES", ""),

					"STRICT_TRANS_TABLES,", ""),

					",STRICT_TRANS_TABLES", ""),

					"STRICT_TRANS_TABLES", "")'

				);

			}

		}

		return $this->conn_id;

	}

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

	/**

	 * Reconnect

	 *

	 * Keep / reestablish the db connection if no queries have been

	 * sent for a length of time exceeding the server's idle timeout

	 *

	 * @return	void

	 */

	public function reconnect()

	{

		if (mysql_ping($this->conn_id) === FALSE)

		{

			$this->conn_id = FALSE;

		}

	}

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

	/**

	 * Select the database

	 *

	 * @param	string	$database

	 * @return	bool

	 */

	public function db_select($database = '')

	{

		if ($database === '')

		{

			$database = $this->database;

		}

		if (mysql_select_db($database, $this->conn_id))

		{

			$this->database = $database;

			$this->data_cache = array();

			return TRUE;

		}

		return FALSE;

	}

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

	/**

	 * Set client character set

	 *

	 * @param	string	$charset

	 * @return	bool

	 */

	protected function _db_set_charset($charset)

	{

		return mysql_set_charset($charset, $this->conn_id);

	}

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

	/**

	 * Database version number

	 *

	 * @return	string

	 */

	public function version()

	{

		if (isset($this->data_cache['version']))

		{

			return $this->data_cache['version'];

		}

		if ( ! $this->conn_id OR ($version = mysql_get_server_info($this->conn_id)) === FALSE)

		{

			return FALSE;

		}

		return $this->data_cache['version'] = $version;

	}

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

	/**

	 * Execute the query

	 *

	 * @param	string	$sql	an SQL query

	 * @return	mixed

	 */

	protected function _execute($sql)

	{

		return mysql_query($this->_prep_query($sql), $this->conn_id);

	}

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

	/**

	 * Prep the query

	 *

	 * If needed, each database adapter can prep the query string

	 *

	 * @param	string	$sql	an SQL query

	 * @return	string

	 */

	protected function _prep_query($sql)

	{

		// mysql_affected_rows() returns 0 for "DELETE FROM TABLE" queries. This hack

		// modifies the query so that it a proper number of affected rows is returned.

		if ($this->delete_hack === TRUE && preg_match('/^\s*DELETE\s+FROM\s+(\S+)\s*$/i', $sql))

		{

			return trim($sql).' WHERE 1=1';

		}

		return $sql;

	}

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

	/**

	 * Begin Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_begin()

	{

		$this->simple_query('SET AUTOCOMMIT=0');

		return $this->simple_query('START TRANSACTION'); // can also be BEGIN or BEGIN WORK

	}

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

	/**

	 * Commit Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_commit()

	{

		if ($this->simple_query('COMMIT'))

		{

			$this->simple_query('SET AUTOCOMMIT=1');

			return TRUE;

		}

		return FALSE;

	}

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

	/**

	 * Rollback Transaction

	 *

	 * @return	bool

	 */

	protected function _trans_rollback()

	{

		if ($this->simple_query('ROLLBACK'))

		{

			$this->simple_query('SET AUTOCOMMIT=1');

			return TRUE;

		}

		return FALSE;

	}

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

	/**

	 * Platform-dependent string escape

	 *

	 * @param	string

	 * @return	string

	 */

	protected function _escape_str($str)

	{

		return mysql_real_escape_string($str, $this->conn_id);

	}

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

	/**

	 * Affected Rows

	 *

	 * @return	int

	 */

	public function affected_rows()

	{

		return mysql_affected_rows($this->conn_id);

	}

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

	/**

	 * Insert ID

	 *

	 * @return	int

	 */

	public function insert_id()

	{

		return mysql_insert_id($this->conn_id);

	}

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

	/**

	 * List table query

	 *

	 * Generates a platform-specific query string so that the table names can be fetched

	 *

	 * @param	bool	$prefix_limit

	 * @return	string

	 */

	protected function _list_tables($prefix_limit = FALSE)

	{

		$sql = 'SHOW TABLES FROM '.$this->_escape_char.$this->database.$this->_escape_char;

		if ($prefix_limit !== FALSE && $this->dbprefix !== '')

		{

			return $sql." LIKE '".$this->escape_like_str($this->dbprefix)."%'";

		}

		return $sql;

	}

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

	/**

	 * Show column query

	 *

	 * Generates a platform-specific query string so that the column names can be fetched

	 *

	 * @param	string	$table

	 * @return	string

	 */

	protected function _list_columns($table = '')

	{

		return 'SHOW COLUMNS FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE);

	}

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

	/**

	 * Returns an object with field data

	 *

	 * @param	string	$table

	 * @return	array

	 */

	public function field_data($table)

	{

		if (($query = $this->query('SHOW COLUMNS FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE))) === FALSE)

		{

			return FALSE;

		}

		$query = $query->result_object();

		$retval = array();

		for ($i = 0, $c = count($query); $i < $c; $i++)

		{

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

			$retval[$i]->name		= $query[$i]->Field;

			sscanf($query[$i]->Type, '%[a-z](%d)',

				$retval[$i]->type,

				$retval[$i]->max_length

			);

			$retval[$i]->default		= $query[$i]->Default;

			$retval[$i]->primary_key	= (int) ($query[$i]->Key === 'PRI');

		}

		return $retval;

	}

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

	/**

	 * Error

	 *

	 * Returns an array containing code and message of the last

	 * database error that has occurred.

	 *

	 * @return	array

	 */

	public function error()

	{

		return array('code' => mysql_errno($this->conn_id), 'message' => mysql_error($this->conn_id));

	}

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

	/**

	 * FROM tables

	 *

	 * Groups tables in FROM clauses if needed, so there is no confusion

	 * about operator precedence.

	 *

	 * @return	string

	 */

	protected function _from_tables()

	{

		if ( ! empty($this->qb_join) && count($this->qb_from) > 1)

		{

			return '('.implode(', ', $this->qb_from).')';

		}

		return implode(', ', $this->qb_from);

	}

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

	/**

	 * Close DB Connection

	 *

	 * @return	void

	 */

	protected function _close()

	{

		// Error suppression to avoid annoying E_WARNINGs in cases

		// where the connection has already been closed for some reason.

		@mysql_close($this->conn_id);

	}

}