485 lines
11 KiB
PHP
485 lines
11 KiB
PHP
<?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 - 2015, 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. (http://ellislab.com/)
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* @copyright Copyright (c) 2014 - 2015, 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 http://codeigniter.com
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* @since Version 1.3.0
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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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* MySQLi 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_mysqli_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 = 'mysqli';
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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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* Database connection
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*
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* @param bool $persistent
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* @return object
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* @todo SSL support
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*/
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public function db_connect($persistent = FALSE)
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{
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// Do we have a socket path?
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if ($this->hostname[0] === '/')
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{
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$hostname = NULL;
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$port = NULL;
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$socket = $this->hostname;
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}
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else
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{
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// Persistent connection support was added in PHP 5.3.0
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$hostname = ($persistent === TRUE && is_php('5.3'))
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? 'p:'.$this->hostname : $this->hostname;
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$port = empty($this->port) ? NULL : $this->port;
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$socket = NULL;
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}
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$client_flags = ($this->compress === TRUE) ? MYSQLI_CLIENT_COMPRESS : 0;
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$mysqli = mysqli_init();
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$mysqli->options(MYSQLI_OPT_CONNECT_TIMEOUT, 10);
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if ($this->stricton)
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{
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$mysqli->options(MYSQLI_INIT_COMMAND, 'SET SESSION sql_mode="STRICT_ALL_TABLES"');
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}
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return $mysqli->real_connect($hostname, $this->username, $this->password, $this->database, $port, $socket, $client_flags)
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? $mysqli : FALSE;
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}
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// --------------------------------------------------------------------
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/**
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* Reconnect
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*
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* Keep / reestablish the db connection if no queries have been
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* sent for a length of time exceeding the server's idle timeout
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*
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* @return void
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*/
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public function reconnect()
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{
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if ($this->conn_id !== FALSE && $this->conn_id->ping() === FALSE)
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{
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$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 = $this->database;
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}
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if ($this->conn_id->select_db($database))
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{
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$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 $this->conn_id->set_charset($charset);
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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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return $this->data_cache['version'] = $this->conn_id->server_info;
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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 $this->conn_id->query($this->_prep_query($sql));
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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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// mysqli_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->conn_id->autocommit(FALSE);
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return is_php('5.5')
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? $this->conn_id->begin_transaction()
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: $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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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 $this->_trans_depth > 0)
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{
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return TRUE;
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}
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if ($this->conn_id->commit())
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{
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$this->conn_id->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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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 $this->_trans_depth > 0)
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{
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return TRUE;
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}
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if ($this->conn_id->rollback())
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{
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$this->conn_id->autocommit(TRUE);
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return TRUE;
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}
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return FALSE;
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}
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// --------------------------------------------------------------------
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/**
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* Platform-dependant string escape
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*
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* @param string
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* @return string
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*/
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protected function _escape_str($str)
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{
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return $this->conn_id->real_escape_string($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 $this->conn_id->affected_rows;
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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 $this->conn_id->insert_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 $retval;
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}
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// --------------------------------------------------------------------
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/**
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* Error
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*
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* Returns an array containing code and message of the last
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* database error that has occurred.
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*
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* @return array
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*/
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public function error()
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{
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if ( ! empty($this->conn_id->connect_errno))
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{
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return array(
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'code' => $this->conn_id->connect_errno,
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'message' => is_php('5.2.9') ? $this->conn_id->connect_error : mysqli_connect_error()
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);
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}
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return array('code' => $this->conn_id->errno, 'message' => $this->conn_id->error);
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}
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// --------------------------------------------------------------------
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/**
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* FROM tables
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*
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* Groups tables in FROM clauses if needed, so there is no confusion
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* about operator precedence.
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*
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* @return string
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*/
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protected function _from_tables()
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{
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if ( ! empty($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(', ', $this->qb_from);
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}
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// --------------------------------------------------------------------
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/**
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* Close DB Connection
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*
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* @return void
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*/
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protected function _close()
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{
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$this->conn_id->close();
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}
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}
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