496 lines
11 KiB
PHP
Executable File
496 lines
11 KiB
PHP
Executable File
<?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 5.2.4 or newer
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*
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* NOTICE OF LICENSE
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*
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* Licensed under the Open Software License version 3.0
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*
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* This source file is subject to the Open Software License (OSL 3.0) that is
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* bundled with this package in the files license.txt / license.rst. It is
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* also available through the world wide web at this URL:
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* http://opensource.org/licenses/OSL-3.0
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* If you did not receive a copy of the license and are unable to obtain it
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* through the world wide web, please send an email to
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* licensing@ellislab.com so we can send you a copy immediately.
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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. (http://ellislab.com/)
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* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
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* @link http://codeigniter.com
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* @since Version 1.0
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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 http://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 = FALSE;
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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', $this->database)
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: FALSE;
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}
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if ($this->stricton && is_resource($this->conn_id))
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{
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$this->simple_query('SET SESSION sql_mode="STRICT_ALL_TABLES"');
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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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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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elseif ( ! $this->conn_id)
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{
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$this->initialize();
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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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* @param bool $test_mode
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* @return bool
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*/
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public function trans_begin($test_mode = FALSE)
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{
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
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{
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return TRUE;
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}
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// Reset the transaction failure flag.
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// If the $test_mode flag is set to TRUE transactions will be rolled back
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// even if the queries produce a successful result.
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$this->_trans_failure = ($test_mode === TRUE);
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$this->simple_query('SET AUTOCOMMIT=0');
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$this->simple_query('START TRANSACTION'); // can also be BEGIN or BEGIN WORK
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return TRUE;
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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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public function trans_commit()
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{
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
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{
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return TRUE;
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}
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$this->simple_query('COMMIT');
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$this->simple_query('SET AUTOCOMMIT=1');
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return TRUE;
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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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public function trans_rollback()
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{
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ( ! $this->trans_enabled OR $this->_trans_depth > 0)
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{
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return TRUE;
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}
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$this->simple_query('ROLLBACK');
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$this->simple_query('SET AUTOCOMMIT=1');
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Platform-dependant string escape
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*
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* @param string
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* @return string
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*/
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protected function _escape_str($str)
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{
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return is_resource($this->conn_id)
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? mysql_real_escape_string($str, $this->conn_id)
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: addslashes($str);
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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 ($table === '')
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{
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return ($this->db_debug) ? $this->display_error('db_field_param_missing') : FALSE;
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}
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if (($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 $retval;
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}
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// --------------------------------------------------------------------
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/**
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* Error
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*
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* Returns an array containing code and message of the last
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* database error that has occured.
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*
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* @return array
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*/
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public function error()
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{
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return array('code' => mysql_errno($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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/* End of file mysql_driver.php */
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/* Location: ./system/database/drivers/mysql/mysql_driver.php */ |