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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 3.0.0 * @filesource */ defined('BASEPATH') OR exit('No direct script access allowed'); /** * PDO 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_pdo_mysql_driver extends CI_DB_pdo_driver { /** * Sub-driver * * @var string */ public $subdriver = 'mysql'; /** * Compression flag * * @var bool */ public $compress = FALSE; /** * 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 * * Builds the DSN if not already set. * * @param array $params * @return void */ public function __construct($params) { parent::__construct($params); if (empty($this->dsn)) { $this->dsn = 'mysql:host='.(empty($this->hostname) ? '127.0.0.1' : $this->hostname); empty($this->port) OR $this->dsn .= ';port='.$this->port; empty($this->database) OR $this->dsn .= ';dbname='.$this->database; empty($this->char_set) OR $this->dsn .= ';charset='.$this->char_set; } elseif ( ! empty($this->char_set) && strpos($this->dsn, 'charset=', 6) === FALSE) { $this->dsn .= ';charset='.$this->char_set; } } // -------------------------------------------------------------------- /** * Database connection * * @param bool $persistent * @return object */ public function db_connect($persistent = FALSE) { if (isset($this->stricton)) { if ($this->stricton) { $sql = 'CONCAT(@@sql_mode, ",", "STRICT_ALL_TABLES")'; } else { $sql = 'REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE( @@sql_mode, "STRICT_ALL_TABLES,", ""), ",STRICT_ALL_TABLES", ""), "STRICT_ALL_TABLES", ""), "STRICT_TRANS_TABLES,", ""), ",STRICT_TRANS_TABLES", ""), "STRICT_TRANS_TABLES", "")'; } if ( ! empty($sql)) { if (empty($this->options[PDO::MYSQL_ATTR_INIT_COMMAND])) { $this->options[PDO::MYSQL_ATTR_INIT_COMMAND] = 'SET SESSION sql_mode = '.$sql; } else { $this->options[PDO::MYSQL_ATTR_INIT_COMMAND] .= ', @@session.sql_mode = '.$sql; } } } if ($this->compress === TRUE) { $this->options[PDO::MYSQL_ATTR_COMPRESS] = TRUE; } if (is_array($this->encrypt)) { $ssl = array(); empty($this->encrypt['ssl_key']) OR $ssl[PDO::MYSQL_ATTR_SSL_KEY] = $this->encrypt['ssl_key']; empty($this->encrypt['ssl_cert']) OR $ssl[PDO::MYSQL_ATTR_SSL_CERT] = $this->encrypt['ssl_cert']; empty($this->encrypt['ssl_ca']) OR $ssl[PDO::MYSQL_ATTR_SSL_CA] = $this->encrypt['ssl_ca']; empty($this->encrypt['ssl_capath']) OR $ssl[PDO::MYSQL_ATTR_SSL_CAPATH] = $this->encrypt['ssl_capath']; empty($this->encrypt['ssl_cipher']) OR $ssl[PDO::MYSQL_ATTR_SSL_CIPHER] = $this->encrypt['ssl_cipher']; if (defined('PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT') && isset($this->encrypt['ssl_verify'])) { $ssl[PDO::MYSQL_ATTR_SSL_VERIFY_SERVER_CERT] = $this->encrypt['ssl_verify']; } // DO NOT use array_merge() here! // It re-indexes numeric keys and the PDO_MYSQL_ATTR_SSL_* constants are integers. empty($ssl) OR $this->options += $ssl; } // Prior to version 5.7.3, MySQL silently downgrades to an unencrypted connection if SSL setup fails if ( ($pdo = parent::db_connect($persistent)) !== FALSE && ! empty($ssl) && version_compare($pdo->getAttribute(PDO::ATTR_CLIENT_VERSION), '5.7.3', '<=') && empty($pdo->query("SHOW STATUS LIKE 'ssl_cipher'")->fetchObject()->Value) ) { $message = 'PDO_MYSQL was configured for an SSL connection, but got an unencrypted connection instead!'; log_message('error', $message); return ($this->db_debug) ? $this->display_error($message, '', TRUE) : FALSE; } return $pdo; } // -------------------------------------------------------------------- /** * Select the database * * @param string $database * @return bool */ public function db_select($database = '') { if ($database === '') { $database = $this->database; } if (FALSE !== $this->simple_query('USE '.$this->escape_identifiers($database))) { $this->database = $database; $this->data_cache = array(); return TRUE; } return FALSE; } // -------------------------------------------------------------------- /** * Begin Transaction * * @return bool */ protected function _trans_begin() { $this->conn_id->setAttribute(PDO::ATTR_AUTOCOMMIT, FALSE); return $this->conn_id->beginTransaction(); } // -------------------------------------------------------------------- /** * Commit Transaction * * @return bool */ protected function _trans_commit() { if ($this->conn_id->commit()) { $this->conn_id->setAttribute(PDO::ATTR_AUTOCOMMIT, TRUE); return TRUE; } return FALSE; } // -------------------------------------------------------------------- /** * Rollback Transaction * * @return bool */ protected function _trans_rollback() { if ($this->conn_id->rollBack()) { $this->conn_id->setAttribute(PDO::ATTR_AUTOCOMMIT, TRUE); return TRUE; } return FALSE; } // -------------------------------------------------------------------- /** * Show 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 === TRUE && $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; } // -------------------------------------------------------------------- /** * Truncate statement * * Generates a platform-specific truncate string from the supplied data * * If the database does not support the TRUNCATE statement, * then this method maps to 'DELETE FROM table' * * @param string $table * @return string */ protected function _truncate($table) { return 'TRUNCATE '.$table; } // -------------------------------------------------------------------- /** * FROM tables * * Groups tables in FROM clauses if needed, so there is no confusion * about operator precedence. * * @return string */ protected function _from_tables() { if ( ! empty($this->qb_join) && count($this->qb_from) > 1) { return '('.implode(', ', $this->qb_from).')'; } return implode(', ', $this->qb_from); } }
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