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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 - 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 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, $client_flags);// ----------------------------------------------------------------// Select the DB... assuming a database name is specified in the config fileif ($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_identifiers($this->database);if ($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);}}