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494 lines
11 KiB
494 lines
11 KiB
<?php
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/**
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* CodeIgniter
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*
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* An open source application development framework for PHP
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*
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* This content is released under the MIT License (MIT)
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*
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* Copyright (c) 2014 - 2017, British Columbia Institute of Technology
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @package CodeIgniter
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* @author EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2017, British Columbia Institute of Technology (http://bcit.ca/)
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* @license http://opensource.org/licenses/MIT MIT License
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* @link https://codeigniter.com
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* @since Version 1.0.0
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* @filesource
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*/
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defined('BASEPATH') OR exit('No direct script access allowed');
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/**
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* MySQL Database Adapter Class
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*
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* Note: _DB is an extender class that the app controller
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* creates dynamically based on whether the query builder
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* class is being used or not.
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*
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* @package CodeIgniter
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* @subpackage Drivers
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* @category Database
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* @author EllisLab Dev Team
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* @link https://codeigniter.com/user_guide/database/
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*/
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class CI_DB_mysql_driver extends CI_DB {
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/**
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* Database driver
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*
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* @var string
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*/
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public $dbdriver = 'mysql';
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/**
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* Compression flag
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*
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* @var bool
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*/
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public $compress = FALSE;
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/**
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* DELETE hack flag
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*
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* Whether to use the MySQL "delete hack" which allows the number
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* of affected rows to be shown. Uses a preg_replace when enabled,
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* adding a bit more processing to all queries.
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*
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* @var bool
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*/
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public $delete_hack = TRUE;
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/**
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* Strict ON flag
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*
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* Whether we're running in strict SQL mode.
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*
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* @var bool
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*/
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public $stricton;
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// --------------------------------------------------------------------
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/**
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* Identifier escape character
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*
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* @var string
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*/
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protected $_escape_char = '`';
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// --------------------------------------------------------------------
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/**
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* Class constructor
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*
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* @param array $params
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* @return void
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*/
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public function __construct($params)
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{
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parent::__construct($params);
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if ( ! empty($this->port))
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{
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$this->hostname .= ':'.$this->port;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Non-persistent database connection
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*
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* @param bool $persistent
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* @return resource
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*/
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public function db_connect($persistent = FALSE)
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{
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$client_flags = ($this->compress === FALSE) ? 0 : MYSQL_CLIENT_COMPRESS;
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if ($this->encrypt === TRUE)
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{
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$client_flags = $client_flags | MYSQL_CLIENT_SSL;
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}
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// Error suppression is necessary mostly due to PHP 5.5+ issuing E_DEPRECATED messages
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$this->conn_id = ($persistent === TRUE)
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? mysql_pconnect($this->hostname, $this->username, $this->password, $client_flags)
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: mysql_connect($this->hostname, $this->username, $this->password, TRUE, $client_flags);
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// ----------------------------------------------------------------
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// Select the DB... assuming a database name is specified in the config file
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if ($this->database !== '' && ! $this->db_select())
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{
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log_message('error', 'Unable to select database: '.$this->database);
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return ($this->db_debug === TRUE)
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? $this->display_error('db_unable_to_select', $this->database)
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: FALSE;
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}
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if (isset($this->stricton) && is_resource($this->conn_id))
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{
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if ($this->stricton)
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{
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$this->simple_query('SET SESSION sql_mode = CONCAT(@@sql_mode, ",", "STRICT_ALL_TABLES")');
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}
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else
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{
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$this->simple_query(
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'SET SESSION sql_mode =
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REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(
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@@sql_mode,
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"STRICT_ALL_TABLES,", ""),
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",STRICT_ALL_TABLES", ""),
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"STRICT_ALL_TABLES", ""),
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"STRICT_TRANS_TABLES,", ""),
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",STRICT_TRANS_TABLES", ""),
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"STRICT_TRANS_TABLES", "")'
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);
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}
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}
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return $this->conn_id;
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}
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// --------------------------------------------------------------------
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/**
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* Reconnect
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*
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* Keep / reestablish the db connection if no queries have been
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* sent for a length of time exceeding the server's idle timeout
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*
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* @return void
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*/
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public function reconnect()
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{
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if (mysql_ping($this->conn_id) === FALSE)
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{
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$this->conn_id = FALSE;
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}
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}
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// --------------------------------------------------------------------
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/**
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* Select the database
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*
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* @param string $database
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* @return bool
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*/
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public function db_select($database = '')
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{
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if ($database === '')
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{
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$database = $this->database;
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}
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if (mysql_select_db($database, $this->conn_id))
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{
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$this->database = $database;
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$this->data_cache = array();
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return TRUE;
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}
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return FALSE;
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}
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// --------------------------------------------------------------------
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/**
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* Set client character set
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*
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* @param string $charset
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* @return bool
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*/
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protected function _db_set_charset($charset)
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{
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return mysql_set_charset($charset, $this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Database version number
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*
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* @return string
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*/
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public function version()
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{
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if (isset($this->data_cache['version']))
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{
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return $this->data_cache['version'];
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}
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if ( ! $this->conn_id OR ($version = mysql_get_server_info($this->conn_id)) === FALSE)
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{
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return FALSE;
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}
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return $this->data_cache['version'] = $version;
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}
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// --------------------------------------------------------------------
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/**
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* Execute the query
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*
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* @param string $sql an SQL query
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* @return mixed
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*/
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protected function _execute($sql)
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{
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return mysql_query($this->_prep_query($sql), $this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Prep the query
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*
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* If needed, each database adapter can prep the query string
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*
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* @param string $sql an SQL query
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* @return string
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*/
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protected function _prep_query($sql)
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{
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// mysql_affected_rows() returns 0 for "DELETE FROM TABLE" queries. This hack
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// modifies the query so that it a proper number of affected rows is returned.
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if ($this->delete_hack === TRUE && preg_match('/^\s*DELETE\s+FROM\s+(\S+)\s*$/i', $sql))
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{
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return trim($sql).' WHERE 1=1';
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}
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Begin Transaction
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*
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* @return bool
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*/
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protected function _trans_begin()
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{
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$this->simple_query('SET AUTOCOMMIT=0');
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return $this->simple_query('START TRANSACTION'); // can also be BEGIN or BEGIN WORK
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}
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// --------------------------------------------------------------------
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/**
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* Commit Transaction
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*
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* @return bool
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*/
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protected function _trans_commit()
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{
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if ($this->simple_query('COMMIT'))
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{
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$this->simple_query('SET AUTOCOMMIT=1');
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return TRUE;
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}
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return FALSE;
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}
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// --------------------------------------------------------------------
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/**
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* Rollback Transaction
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*
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* @return bool
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*/
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protected function _trans_rollback()
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{
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if ($this->simple_query('ROLLBACK'))
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{
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$this->simple_query('SET AUTOCOMMIT=1');
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return TRUE;
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}
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return FALSE;
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}
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// --------------------------------------------------------------------
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/**
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* Platform-dependent string escape
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*
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* @param string
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* @return string
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*/
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protected function _escape_str($str)
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{
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return mysql_real_escape_string($str, $this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Affected Rows
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*
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* @return int
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*/
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public function affected_rows()
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{
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return mysql_affected_rows($this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* Insert ID
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*
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* @return int
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*/
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public function insert_id()
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{
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return mysql_insert_id($this->conn_id);
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}
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// --------------------------------------------------------------------
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/**
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* List table query
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*
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* Generates a platform-specific query string so that the table names can be fetched
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*
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* @param bool $prefix_limit
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* @return string
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*/
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protected function _list_tables($prefix_limit = FALSE)
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{
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$sql = 'SHOW TABLES FROM '.$this->escape_identifiers($this->database);
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if ($prefix_limit !== FALSE && $this->dbprefix !== '')
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{
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return $sql." LIKE '".$this->escape_like_str($this->dbprefix)."%'";
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}
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return $sql;
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}
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// --------------------------------------------------------------------
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/**
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* Show column query
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*
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* Generates a platform-specific query string so that the column names can be fetched
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*
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* @param string $table
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* @return string
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*/
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protected function _list_columns($table = '')
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{
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return 'SHOW COLUMNS FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE);
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}
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// --------------------------------------------------------------------
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/**
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* Returns an object with field data
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*
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* @param string $table
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* @return array
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*/
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public function field_data($table)
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{
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if (($query = $this->query('SHOW COLUMNS FROM '.$this->protect_identifiers($table, TRUE, NULL, FALSE))) === FALSE)
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{
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return FALSE;
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}
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$query = $query->result_object();
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$retval = array();
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for ($i = 0, $c = count($query); $i < $c; $i++)
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{
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$retval[$i] = new stdClass();
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$retval[$i]->name = $query[$i]->Field;
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sscanf($query[$i]->Type, '%[a-z](%d)',
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$retval[$i]->type,
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$retval[$i]->max_length
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);
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$retval[$i]->default = $query[$i]->Default;
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$retval[$i]->primary_key = (int) ($query[$i]->Key === 'PRI');
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}
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return $retval;
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}
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// --------------------------------------------------------------------
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/**
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* Error
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*
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* Returns an array containing code and message of the last
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* database error that has occurred.
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*
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* @return array
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*/
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public function error()
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{
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return array('code' => mysql_errno($this->conn_id), 'message' => mysql_error($this->conn_id));
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}
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// --------------------------------------------------------------------
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/**
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* FROM tables
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*
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* Groups tables in FROM clauses if needed, so there is no confusion
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* about operator precedence.
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*
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* @return string
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*/
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protected function _from_tables()
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{
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if ( ! empty($this->qb_join) && count($this->qb_from) > 1)
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{
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return '('.implode(', ', $this->qb_from).')';
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}
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return implode(', ', $this->qb_from);
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}
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// --------------------------------------------------------------------
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/**
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* Close DB Connection
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*
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* @return void
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*/
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protected function _close()
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{
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// Error suppression to avoid annoying E_WARNINGs in cases
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// where the connection has already been closed for some reason.
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@mysql_close($this->conn_id);
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}
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}
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