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