1390 行
无行尾
32 KiB
PHP
1390 行
无行尾
32 KiB
PHP
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
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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 5.1.6 or newer
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*
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* @package CodeIgniter
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* @author ExpressionEngine Dev Team
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* @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
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* @license http://codeigniter.com/user_guide/license.html
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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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// ------------------------------------------------------------------------
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/**
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* Database Driver Class
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*
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* This is the platform-independent base DB implementation class.
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* This class will not be called directly. Rather, the adapter
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* class for the specific database will extend and instantiate it.
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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 ExpressionEngine Dev Team
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* @link http://codeigniter.com/user_guide/database/
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*/
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class CI_DB_driver {
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var $username;
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var $password;
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var $hostname;
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var $database;
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var $dbdriver = 'mysql';
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var $dbprefix = '';
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var $char_set = 'utf8';
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var $dbcollat = 'utf8_general_ci';
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var $autoinit = TRUE; // Whether to automatically initialize the DB
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var $swap_pre = '';
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var $port = '';
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var $pconnect = FALSE;
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var $conn_id = FALSE;
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var $result_id = FALSE;
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var $db_debug = FALSE;
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var $benchmark = 0;
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var $query_count = 0;
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var $bind_marker = '?';
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var $save_queries = TRUE;
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var $queries = array();
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var $query_times = array();
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var $data_cache = array();
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var $trans_enabled = TRUE;
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var $trans_strict = TRUE;
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var $_trans_depth = 0;
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var $_trans_status = TRUE; // Used with transactions to determine if a rollback should occur
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var $cache_on = FALSE;
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var $cachedir = '';
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var $cache_autodel = FALSE;
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var $CACHE; // The cache class object
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// Private variables
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var $_protect_identifiers = TRUE;
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var $_reserved_identifiers = array('*'); // Identifiers that should NOT be escaped
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// These are use with Oracle
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var $stmt_id;
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var $curs_id;
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var $limit_used;
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/**
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* Constructor. Accepts one parameter containing the database
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* connection settings.
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*
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* @param array
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*/
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function CI_DB_driver($params)
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{
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if (is_array($params))
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{
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foreach ($params as $key => $val)
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{
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$this->$key = $val;
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}
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}
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log_message('debug', 'Database Driver Class Initialized');
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}
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// --------------------------------------------------------------------
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/**
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* Initialize Database Settings
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*
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* @access private Called by the constructor
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* @param mixed
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* @return void
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*/
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function initialize()
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{
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// If an existing connection resource is available
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// there is no need to connect and select the database
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if (is_resource($this->conn_id) OR is_object($this->conn_id))
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{
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return TRUE;
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}
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// ----------------------------------------------------------------
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// Connect to the database and set the connection ID
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$this->conn_id = ($this->pconnect == FALSE) ? $this->db_connect() : $this->db_pconnect();
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// No connection resource? Throw an error
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if ( ! $this->conn_id)
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{
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log_message('error', 'Unable to connect to the database');
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if ($this->db_debug)
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{
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$this->display_error('db_unable_to_connect');
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}
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return FALSE;
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}
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// ----------------------------------------------------------------
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// Select the DB... assuming a database name is specified in the config file
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if ($this->database != '')
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{
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if ( ! $this->db_select())
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{
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log_message('error', 'Unable to select database: '.$this->database);
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if ($this->db_debug)
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{
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$this->display_error('db_unable_to_select', $this->database);
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}
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return FALSE;
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}
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else
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{
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// We've selected the DB. Now we set the character set
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if ( ! $this->db_set_charset($this->char_set, $this->dbcollat))
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{
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return FALSE;
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}
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return TRUE;
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}
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}
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Set client character set
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*
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* @access public
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* @param string
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* @param string
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* @return resource
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*/
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function db_set_charset($charset, $collation)
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{
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if ( ! $this->_db_set_charset($this->char_set, $this->dbcollat))
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{
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log_message('error', 'Unable to set database connection charset: '.$this->char_set);
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if ($this->db_debug)
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{
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$this->display_error('db_unable_to_set_charset', $this->char_set);
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}
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return FALSE;
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}
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* The name of the platform in use (mysql, mssql, etc...)
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*
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* @access public
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* @return string
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*/
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function platform()
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{
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return $this->dbdriver;
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}
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// --------------------------------------------------------------------
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/**
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* Database Version Number. Returns a string containing the
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* version of the database being used
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*
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* @access public
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* @return string
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*/
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function version()
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{
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if (FALSE === ($sql = $this->_version()))
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{
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if ($this->db_debug)
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{
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return $this->display_error('db_unsupported_function');
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}
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return FALSE;
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}
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// Some DBs have functions that return the version, and don't run special
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// SQL queries per se. In these instances, just return the result.
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$driver_version_exceptions = array('oci8', 'sqlite');
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if (in_array($this->dbdriver, $driver_version_exceptions))
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{
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return $sql;
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}
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else
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{
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$query = $this->query($sql);
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return $query->row('ver');
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}
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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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* Accepts an SQL string as input and returns a result object upon
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* successful execution of a "read" type query. Returns boolean TRUE
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* upon successful execution of a "write" type query. Returns boolean
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* FALSE upon failure, and if the $db_debug variable is set to TRUE
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* will raise an error.
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*
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* @access public
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* @param string An SQL query string
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* @param array An array of binding data
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* @return mixed
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*/
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function query($sql, $binds = FALSE, $return_object = TRUE)
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{
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if ($sql == '')
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{
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if ($this->db_debug)
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{
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log_message('error', 'Invalid query: '.$sql);
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return $this->display_error('db_invalid_query');
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}
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return FALSE;
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}
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// Verify table prefix and replace if necessary
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if ( ($this->dbprefix != '' AND $this->swap_pre != '') AND ($this->dbprefix != $this->swap_pre) )
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{
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$sql = preg_replace("/(\W)".$this->swap_pre."(\S+?)/", "\\1".$this->dbprefix."\\2", $sql);
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}
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// Is query caching enabled? If the query is a "read type"
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// we will load the caching class and return the previously
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// cached query if it exists
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if ($this->cache_on == TRUE AND stristr($sql, 'SELECT'))
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{
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if ($this->_cache_init())
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{
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$this->load_rdriver();
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if (FALSE !== ($cache = $this->CACHE->read($sql)))
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{
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return $cache;
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}
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}
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}
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// Compile binds if needed
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if ($binds !== FALSE)
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{
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$sql = $this->compile_binds($sql, $binds);
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}
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// Save the query for debugging
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if ($this->save_queries == TRUE)
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{
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$this->queries[] = $sql;
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}
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// Start the Query Timer
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$time_start = list($sm, $ss) = explode(' ', microtime());
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// Run the Query
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if (FALSE === ($this->result_id = $this->simple_query($sql)))
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{
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if ($this->save_queries == TRUE)
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{
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$this->query_times[] = 0;
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}
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// This will trigger a rollback if transactions are being used
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$this->_trans_status = FALSE;
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if ($this->db_debug)
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{
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// grab the error number and message now, as we might run some
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// additional queries before displaying the error
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$error_no = $this->_error_number();
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$error_msg = $this->_error_message();
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// We call this function in order to roll-back queries
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// if transactions are enabled. If we don't call this here
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// the error message will trigger an exit, causing the
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// transactions to remain in limbo.
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$this->trans_complete();
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// Log and display errors
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log_message('error', 'Query error: '.$error_msg);
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return $this->display_error(
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array(
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'Error Number: '.$error_no,
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$error_msg,
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$sql
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)
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);
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}
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return FALSE;
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}
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// Stop and aggregate the query time results
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$time_end = list($em, $es) = explode(' ', microtime());
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$this->benchmark += ($em + $es) - ($sm + $ss);
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if ($this->save_queries == TRUE)
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{
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$this->query_times[] = ($em + $es) - ($sm + $ss);
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}
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// Increment the query counter
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$this->query_count++;
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// Was the query a "write" type?
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// If so we'll simply return true
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if ($this->is_write_type($sql) === TRUE)
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{
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// If caching is enabled we'll auto-cleanup any
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// existing files related to this particular URI
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if ($this->cache_on == TRUE AND $this->cache_autodel == TRUE AND $this->_cache_init())
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{
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$this->CACHE->delete();
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}
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return TRUE;
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}
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// Return TRUE if we don't need to create a result object
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// Currently only the Oracle driver uses this when stored
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// procedures are used
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if ($return_object !== TRUE)
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{
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return TRUE;
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}
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// Load and instantiate the result driver
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$driver = $this->load_rdriver();
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$RES = new $driver();
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$RES->conn_id = $this->conn_id;
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$RES->result_id = $this->result_id;
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if ($this->dbdriver == 'oci8')
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{
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$RES->stmt_id = $this->stmt_id;
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$RES->curs_id = NULL;
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$RES->limit_used = $this->limit_used;
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$this->stmt_id = FALSE;
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}
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// oci8 vars must be set before calling this
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$RES->num_rows = $RES->num_rows();
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// Is query caching enabled? If so, we'll serialize the
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// result object and save it to a cache file.
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if ($this->cache_on == TRUE AND $this->_cache_init())
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{
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// We'll create a new instance of the result object
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// only without the platform specific driver since
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// we can't use it with cached data (the query result
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// resource ID won't be any good once we've cached the
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// result object, so we'll have to compile the data
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// and save it)
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$CR = new CI_DB_result();
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$CR->num_rows = $RES->num_rows();
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$CR->result_object = $RES->result_object();
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$CR->result_array = $RES->result_array();
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// Reset these since cached objects can not utilize resource IDs.
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$CR->conn_id = NULL;
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$CR->result_id = NULL;
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$this->CACHE->write($sql, $CR);
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}
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return $RES;
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}
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// --------------------------------------------------------------------
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/**
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* Load the result drivers
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*
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* @access public
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* @return string the name of the result class
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*/
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function load_rdriver()
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{
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$driver = 'CI_DB_'.$this->dbdriver.'_result';
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if ( ! class_exists($driver))
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{
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include_once(BASEPATH.'database/DB_result'.EXT);
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include_once(BASEPATH.'database/drivers/'.$this->dbdriver.'/'.$this->dbdriver.'_result'.EXT);
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}
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return $driver;
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}
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// --------------------------------------------------------------------
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/**
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* Simple Query
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* This is a simplified version of the query() function. Internally
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* we only use it when running transaction commands since they do
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* not require all the features of the main query() function.
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*
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* @access public
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* @param string the sql query
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* @return mixed
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*/
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function simple_query($sql)
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{
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if ( ! $this->conn_id)
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{
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$this->initialize();
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}
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return $this->_execute($sql);
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}
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// --------------------------------------------------------------------
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/**
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* Disable Transactions
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* This permits transactions to be disabled at run-time.
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*
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* @access public
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* @return void
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*/
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function trans_off()
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{
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$this->trans_enabled = FALSE;
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}
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// --------------------------------------------------------------------
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/**
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* Enable/disable Transaction Strict Mode
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* When strict mode is enabled, if you are running multiple groups of
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* transactions, if one group fails all groups will be rolled back.
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* If strict mode is disabled, each group is treated autonomously, meaning
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* a failure of one group will not affect any others
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*
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* @access public
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* @return void
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*/
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function trans_strict($mode = TRUE)
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{
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$this->trans_strict = is_bool($mode) ? $mode : TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Start Transaction
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*
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* @access public
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* @return void
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*/
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function trans_start($test_mode = FALSE)
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{
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if ( ! $this->trans_enabled)
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{
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return FALSE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_depth > 0)
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{
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$this->_trans_depth += 1;
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return;
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}
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$this->trans_begin($test_mode);
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}
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// --------------------------------------------------------------------
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/**
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* Complete Transaction
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*
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* @access public
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* @return bool
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*/
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function trans_complete()
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{
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if ( ! $this->trans_enabled)
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{
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return FALSE;
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}
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// When transactions are nested we only begin/commit/rollback the outermost ones
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if ($this->_trans_depth > 1)
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{
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$this->_trans_depth -= 1;
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return TRUE;
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}
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// The query() function will set this flag to FALSE in the event that a query failed
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if ($this->_trans_status === FALSE)
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{
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$this->trans_rollback();
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// If we are NOT running in strict mode, we will reset
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// the _trans_status flag so that subsequent groups of transactions
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// will be permitted.
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if ($this->trans_strict === FALSE)
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{
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$this->_trans_status = TRUE;
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}
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log_message('debug', 'DB Transaction Failure');
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return FALSE;
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}
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$this->trans_commit();
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Lets you retrieve the transaction flag to determine if it has failed
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*
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* @access public
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* @return bool
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*/
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function trans_status()
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{
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return $this->_trans_status;
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}
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// --------------------------------------------------------------------
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/**
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* Compile Bindings
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*
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* @access public
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* @param string the sql statement
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* @param array an array of bind data
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* @return string
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*/
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function compile_binds($sql, $binds)
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{
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if (strpos($sql, $this->bind_marker) === FALSE)
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{
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return $sql;
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}
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if ( ! is_array($binds))
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{
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$binds = array($binds);
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}
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// Get the sql segments around the bind markers
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$segments = explode($this->bind_marker, $sql);
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// The count of bind should be 1 less then the count of segments
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// If there are more bind arguments trim it down
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if (count($binds) >= count($segments)) {
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$binds = array_slice($binds, 0, count($segments)-1);
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}
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// Construct the binded query
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$result = $segments[0];
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$i = 0;
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foreach ($binds as $bind)
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{
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$result .= $this->escape($bind);
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$result .= $segments[++$i];
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}
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return $result;
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}
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// --------------------------------------------------------------------
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/**
|
|
* Determines if a query is a "write" type.
|
|
*
|
|
* @access public
|
|
* @param string An SQL query string
|
|
* @return boolean
|
|
*/
|
|
function is_write_type($sql)
|
|
{
|
|
if ( ! preg_match('/^\s*"?(SET|INSERT|UPDATE|DELETE|REPLACE|CREATE|DROP|TRUNCATE|LOAD DATA|COPY|ALTER|GRANT|REVOKE|LOCK|UNLOCK)\s+/i', $sql))
|
|
{
|
|
return FALSE;
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Calculate the aggregate query elapsed time
|
|
*
|
|
* @access public
|
|
* @param integer The number of decimal places
|
|
* @return integer
|
|
*/
|
|
function elapsed_time($decimals = 6)
|
|
{
|
|
return number_format($this->benchmark, $decimals);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Returns the total number of queries
|
|
*
|
|
* @access public
|
|
* @return integer
|
|
*/
|
|
function total_queries()
|
|
{
|
|
return $this->query_count;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Returns the last query that was executed
|
|
*
|
|
* @access public
|
|
* @return void
|
|
*/
|
|
function last_query()
|
|
{
|
|
return end($this->queries);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* "Smart" Escape String
|
|
*
|
|
* Escapes data based on type
|
|
* Sets boolean and null types
|
|
*
|
|
* @access public
|
|
* @param string
|
|
* @return mixed
|
|
*/
|
|
function escape($str)
|
|
{
|
|
if (is_string($str))
|
|
{
|
|
$str = "'".$this->escape_str($str)."'";
|
|
}
|
|
elseif (is_bool($str))
|
|
{
|
|
$str = ($str === FALSE) ? 0 : 1;
|
|
}
|
|
elseif (is_null($str))
|
|
{
|
|
$str = 'NULL';
|
|
}
|
|
|
|
return $str;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Escape LIKE String
|
|
*
|
|
* Calls the individual driver for platform
|
|
* specific escaping for LIKE conditions
|
|
*
|
|
* @access public
|
|
* @param string
|
|
* @return mixed
|
|
*/
|
|
function escape_like_str($str)
|
|
{
|
|
return $this->escape_str($str, TRUE);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Primary
|
|
*
|
|
* Retrieves the primary key. It assumes that the row in the first
|
|
* position is the primary key
|
|
*
|
|
* @access public
|
|
* @param string the table name
|
|
* @return string
|
|
*/
|
|
function primary($table = '')
|
|
{
|
|
$fields = $this->list_fields($table);
|
|
|
|
if ( ! is_array($fields))
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
return current($fields);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Returns an array of table names
|
|
*
|
|
* @access public
|
|
* @return array
|
|
*/
|
|
function list_tables($constrain_by_prefix = FALSE)
|
|
{
|
|
// Is there a cached result?
|
|
if (isset($this->data_cache['table_names']))
|
|
{
|
|
return $this->data_cache['table_names'];
|
|
}
|
|
|
|
if (FALSE === ($sql = $this->_list_tables($constrain_by_prefix)))
|
|
{
|
|
if ($this->db_debug)
|
|
{
|
|
return $this->display_error('db_unsupported_function');
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
$retval = array();
|
|
$query = $this->query($sql);
|
|
|
|
if ($query->num_rows() > 0)
|
|
{
|
|
foreach ($query->result_array() as $row)
|
|
{
|
|
if (isset($row['TABLE_NAME']))
|
|
{
|
|
$retval[] = $row['TABLE_NAME'];
|
|
}
|
|
else
|
|
{
|
|
$retval[] = array_shift($row);
|
|
}
|
|
}
|
|
}
|
|
|
|
$this->data_cache['table_names'] = $retval;
|
|
return $this->data_cache['table_names'];
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Determine if a particular table exists
|
|
* @access public
|
|
* @return boolean
|
|
*/
|
|
function table_exists($table_name)
|
|
{
|
|
return ( ! in_array($this->_protect_identifiers($table_name, TRUE, FALSE, FALSE), $this->list_tables())) ? FALSE : TRUE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Fetch MySQL Field Names
|
|
*
|
|
* @access public
|
|
* @param string the table name
|
|
* @return array
|
|
*/
|
|
function list_fields($table = '')
|
|
{
|
|
// Is there a cached result?
|
|
if (isset($this->data_cache['field_names'][$table]))
|
|
{
|
|
return $this->data_cache['field_names'][$table];
|
|
}
|
|
|
|
if ($table == '')
|
|
{
|
|
if ($this->db_debug)
|
|
{
|
|
return $this->display_error('db_field_param_missing');
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
if (FALSE === ($sql = $this->_list_columns($table)))
|
|
{
|
|
if ($this->db_debug)
|
|
{
|
|
return $this->display_error('db_unsupported_function');
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
$query = $this->query($sql);
|
|
|
|
$retval = array();
|
|
foreach ($query->result_array() as $row)
|
|
{
|
|
if (isset($row['COLUMN_NAME']))
|
|
{
|
|
$retval[] = $row['COLUMN_NAME'];
|
|
}
|
|
else
|
|
{
|
|
$retval[] = current($row);
|
|
}
|
|
}
|
|
|
|
$this->data_cache['field_names'][$table] = $retval;
|
|
return $this->data_cache['field_names'][$table];
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Determine if a particular field exists
|
|
* @access public
|
|
* @param string
|
|
* @param string
|
|
* @return boolean
|
|
*/
|
|
function field_exists($field_name, $table_name)
|
|
{
|
|
return ( ! in_array($field_name, $this->list_fields($table_name))) ? FALSE : TRUE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Returns an object with field data
|
|
*
|
|
* @access public
|
|
* @param string the table name
|
|
* @return object
|
|
*/
|
|
function field_data($table = '')
|
|
{
|
|
if ($table == '')
|
|
{
|
|
if ($this->db_debug)
|
|
{
|
|
return $this->display_error('db_field_param_missing');
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
$query = $this->query($this->_field_data($this->_protect_identifiers($table, TRUE, NULL, FALSE)));
|
|
|
|
return $query->field_data();
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Generate an insert string
|
|
*
|
|
* @access public
|
|
* @param string the table upon which the query will be performed
|
|
* @param array an associative array data of key/values
|
|
* @return string
|
|
*/
|
|
function insert_string($table, $data)
|
|
{
|
|
$fields = array();
|
|
$values = array();
|
|
|
|
foreach ($data as $key => $val)
|
|
{
|
|
$fields[] = $this->_escape_identifiers($key);
|
|
$values[] = $this->escape($val);
|
|
}
|
|
|
|
return $this->_insert($this->_protect_identifiers($table, TRUE, NULL, FALSE), $fields, $values);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Generate an update string
|
|
*
|
|
* @access public
|
|
* @param string the table upon which the query will be performed
|
|
* @param array an associative array data of key/values
|
|
* @param mixed the "where" statement
|
|
* @return string
|
|
*/
|
|
function update_string($table, $data, $where)
|
|
{
|
|
if ($where == '')
|
|
{
|
|
return false;
|
|
}
|
|
|
|
$fields = array();
|
|
foreach ($data as $key => $val)
|
|
{
|
|
$fields[$this->_protect_identifiers($key)] = $this->escape($val);
|
|
}
|
|
|
|
if ( ! is_array($where))
|
|
{
|
|
$dest = array($where);
|
|
}
|
|
else
|
|
{
|
|
$dest = array();
|
|
foreach ($where as $key => $val)
|
|
{
|
|
$prefix = (count($dest) == 0) ? '' : ' AND ';
|
|
|
|
if ($val !== '')
|
|
{
|
|
if ( ! $this->_has_operator($key))
|
|
{
|
|
$key .= ' =';
|
|
}
|
|
|
|
$val = ' '.$this->escape($val);
|
|
}
|
|
|
|
$dest[] = $prefix.$key.$val;
|
|
}
|
|
}
|
|
|
|
return $this->_update($this->_protect_identifiers($table, TRUE, NULL, FALSE), $fields, $dest);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Tests whether the string has an SQL operator
|
|
*
|
|
* @access private
|
|
* @param string
|
|
* @return bool
|
|
*/
|
|
function _has_operator($str)
|
|
{
|
|
$str = trim($str);
|
|
if ( ! preg_match("/(\s|<|>|!|=|is null|is not null)/i", $str))
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Enables a native PHP function to be run, using a platform agnostic wrapper.
|
|
*
|
|
* @access public
|
|
* @param string the function name
|
|
* @param mixed any parameters needed by the function
|
|
* @return mixed
|
|
*/
|
|
function call_function($function)
|
|
{
|
|
$driver = ($this->dbdriver == 'postgre') ? 'pg_' : $this->dbdriver.'_';
|
|
|
|
if (FALSE === strpos($driver, $function))
|
|
{
|
|
$function = $driver.$function;
|
|
}
|
|
|
|
if ( ! function_exists($function))
|
|
{
|
|
if ($this->db_debug)
|
|
{
|
|
return $this->display_error('db_unsupported_function');
|
|
}
|
|
return FALSE;
|
|
}
|
|
else
|
|
{
|
|
$args = (func_num_args() > 1) ? array_splice(func_get_args(), 1) : null;
|
|
|
|
return call_user_func_array($function, $args);
|
|
}
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Set Cache Directory Path
|
|
*
|
|
* @access public
|
|
* @param string the path to the cache directory
|
|
* @return void
|
|
*/
|
|
function cache_set_path($path = '')
|
|
{
|
|
$this->cachedir = $path;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Enable Query Caching
|
|
*
|
|
* @access public
|
|
* @return void
|
|
*/
|
|
function cache_on()
|
|
{
|
|
$this->cache_on = TRUE;
|
|
return TRUE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Disable Query Caching
|
|
*
|
|
* @access public
|
|
* @return void
|
|
*/
|
|
function cache_off()
|
|
{
|
|
$this->cache_on = FALSE;
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Delete the cache files associated with a particular URI
|
|
*
|
|
* @access public
|
|
* @return void
|
|
*/
|
|
function cache_delete($segment_one = '', $segment_two = '')
|
|
{
|
|
if ( ! $this->_cache_init())
|
|
{
|
|
return FALSE;
|
|
}
|
|
return $this->CACHE->delete($segment_one, $segment_two);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Delete All cache files
|
|
*
|
|
* @access public
|
|
* @return void
|
|
*/
|
|
function cache_delete_all()
|
|
{
|
|
if ( ! $this->_cache_init())
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
return $this->CACHE->delete_all();
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Initialize the Cache Class
|
|
*
|
|
* @access private
|
|
* @return void
|
|
*/
|
|
function _cache_init()
|
|
{
|
|
if (is_object($this->CACHE) AND class_exists('CI_DB_Cache'))
|
|
{
|
|
return TRUE;
|
|
}
|
|
|
|
if ( ! class_exists('CI_DB_Cache'))
|
|
{
|
|
if ( ! @include(BASEPATH.'database/DB_cache'.EXT))
|
|
{
|
|
return $this->cache_off();
|
|
}
|
|
}
|
|
|
|
$this->CACHE = new CI_DB_Cache($this); // pass db object to support multiple db connections and returned db objects
|
|
return TRUE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Close DB Connection
|
|
*
|
|
* @access public
|
|
* @return void
|
|
*/
|
|
function close()
|
|
{
|
|
if (is_resource($this->conn_id) OR is_object($this->conn_id))
|
|
{
|
|
$this->_close($this->conn_id);
|
|
}
|
|
$this->conn_id = FALSE;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Display an error message
|
|
*
|
|
* @access public
|
|
* @param string the error message
|
|
* @param string any "swap" values
|
|
* @param boolean whether to localize the message
|
|
* @return string sends the application/error_db.php template
|
|
*/
|
|
function display_error($error = '', $swap = '', $native = FALSE)
|
|
{
|
|
$LANG =& load_class('Lang', 'core');
|
|
$LANG->load('db');
|
|
|
|
$heading = $LANG->line('db_error_heading');
|
|
|
|
if ($native == TRUE)
|
|
{
|
|
$message = $error;
|
|
}
|
|
else
|
|
{
|
|
$message = ( ! is_array($error)) ? array(str_replace('%s', $swap, $LANG->line($error))) : $error;
|
|
}
|
|
|
|
// Find the most likely culprit of the error by going through
|
|
// the backtrace until the source file is no longer in the
|
|
// database folder.
|
|
|
|
$trace = debug_backtrace();
|
|
|
|
foreach ($trace as $call)
|
|
{
|
|
if (isset($call['file']) && strpos($call['file'], BASEPATH.'database') === FALSE)
|
|
{
|
|
// Found it - use a relative path for safety
|
|
$message[] = 'Filename: '.str_replace(array(BASEPATH, APPPATH), '', $call['file']);
|
|
$message[] = 'Line Number: '.$call['line'];
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
$error =& load_class('Exceptions', 'core');
|
|
echo $error->show_error($heading, $message, 'error_db');
|
|
exit;
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Protect Identifiers
|
|
*
|
|
* This function adds backticks if appropriate based on db type
|
|
*
|
|
* @access private
|
|
* @param mixed the item to escape
|
|
* @return mixed the item with backticks
|
|
*/
|
|
function protect_identifiers($item, $prefix_single = FALSE)
|
|
{
|
|
return $this->_protect_identifiers($item, $prefix_single);
|
|
}
|
|
|
|
// --------------------------------------------------------------------
|
|
|
|
/**
|
|
* Protect Identifiers
|
|
*
|
|
* This function is used extensively by the Active Record class, and by
|
|
* a couple functions in this class.
|
|
* It takes a column or table name (optionally with an alias) and inserts
|
|
* the table prefix onto it. Some logic is necessary in order to deal with
|
|
* column names that include the path. Consider a query like this:
|
|
*
|
|
* SELECT * FROM hostname.database.table.column AS c FROM hostname.database.table
|
|
*
|
|
* Or a query with aliasing:
|
|
*
|
|
* SELECT m.member_id, m.member_name FROM members AS m
|
|
*
|
|
* Since the column name can include up to four segments (host, DB, table, column)
|
|
* or also have an alias prefix, we need to do a bit of work to figure this out and
|
|
* insert the table prefix (if it exists) in the proper position, and escape only
|
|
* the correct identifiers.
|
|
*
|
|
* @access private
|
|
* @param string
|
|
* @param bool
|
|
* @param mixed
|
|
* @param bool
|
|
* @return string
|
|
*/
|
|
function _protect_identifiers($item, $prefix_single = FALSE, $protect_identifiers = NULL, $field_exists = TRUE)
|
|
{
|
|
if ( ! is_bool($protect_identifiers))
|
|
{
|
|
$protect_identifiers = $this->_protect_identifiers;
|
|
}
|
|
|
|
if (is_array($item))
|
|
{
|
|
$escaped_array = array();
|
|
|
|
foreach ($item as $k => $v)
|
|
{
|
|
$escaped_array[$this->_protect_identifiers($k)] = $this->_protect_identifiers($v);
|
|
}
|
|
|
|
return $escaped_array;
|
|
}
|
|
|
|
// Convert tabs or multiple spaces into single spaces
|
|
$item = preg_replace('/[\t ]+/', ' ', $item);
|
|
|
|
// If the item has an alias declaration we remove it and set it aside.
|
|
// Basically we remove everything to the right of the first space
|
|
$alias = '';
|
|
if (strpos($item, ' ') !== FALSE)
|
|
{
|
|
$alias = strstr($item, " ");
|
|
$item = substr($item, 0, - strlen($alias));
|
|
}
|
|
|
|
// This is basically a bug fix for queries that use MAX, MIN, etc.
|
|
// If a parenthesis is found we know that we do not need to
|
|
// escape the data or add a prefix. There's probably a more graceful
|
|
// way to deal with this, but I'm not thinking of it -- Rick
|
|
if (strpos($item, '(') !== FALSE)
|
|
{
|
|
return $item.$alias;
|
|
}
|
|
|
|
// Break the string apart if it contains periods, then insert the table prefix
|
|
// in the correct location, assuming the period doesn't indicate that we're dealing
|
|
// with an alias. While we're at it, we will escape the components
|
|
if (strpos($item, '.') !== FALSE)
|
|
{
|
|
$parts = explode('.', $item);
|
|
|
|
// Does the first segment of the exploded item match
|
|
// one of the aliases previously identified? If so,
|
|
// we have nothing more to do other than escape the item
|
|
if (in_array($parts[0], $this->ar_aliased_tables))
|
|
{
|
|
if ($protect_identifiers === TRUE)
|
|
{
|
|
foreach ($parts as $key => $val)
|
|
{
|
|
if ( ! in_array($val, $this->_reserved_identifiers))
|
|
{
|
|
$parts[$key] = $this->_escape_identifiers($val);
|
|
}
|
|
}
|
|
|
|
$item = implode('.', $parts);
|
|
}
|
|
return $item.$alias;
|
|
}
|
|
|
|
// Is there a table prefix defined in the config file? If not, no need to do anything
|
|
if ($this->dbprefix != '')
|
|
{
|
|
// We now add the table prefix based on some logic.
|
|
// Do we have 4 segments (hostname.database.table.column)?
|
|
// If so, we add the table prefix to the column name in the 3rd segment.
|
|
if (isset($parts[3]))
|
|
{
|
|
$i = 2;
|
|
}
|
|
// Do we have 3 segments (database.table.column)?
|
|
// If so, we add the table prefix to the column name in 2nd position
|
|
elseif (isset($parts[2]))
|
|
{
|
|
$i = 1;
|
|
}
|
|
// Do we have 2 segments (table.column)?
|
|
// If so, we add the table prefix to the column name in 1st segment
|
|
else
|
|
{
|
|
$i = 0;
|
|
}
|
|
|
|
// This flag is set when the supplied $item does not contain a field name.
|
|
// This can happen when this function is being called from a JOIN.
|
|
if ($field_exists == FALSE)
|
|
{
|
|
$i++;
|
|
}
|
|
|
|
// Verify table prefix and replace if necessary
|
|
if ($this->swap_pre != '' && strncmp($parts[$i], $this->swap_pre, strlen($this->swap_pre)) === 0)
|
|
{
|
|
$parts[$i] = preg_replace("/^".$this->swap_pre."(\S+?)/", $this->dbprefix."\\1", $parts[$i]);
|
|
}
|
|
|
|
// We only add the table prefix if it does not already exist
|
|
if (substr($parts[$i], 0, strlen($this->dbprefix)) != $this->dbprefix)
|
|
{
|
|
$parts[$i] = $this->dbprefix.$parts[$i];
|
|
}
|
|
|
|
// Put the parts back together
|
|
$item = implode('.', $parts);
|
|
}
|
|
|
|
if ($protect_identifiers === TRUE)
|
|
{
|
|
$item = $this->_escape_identifiers($item);
|
|
}
|
|
|
|
return $item.$alias;
|
|
}
|
|
|
|
// Is there a table prefix? If not, no need to insert it
|
|
if ($this->dbprefix != '')
|
|
{
|
|
// Verify table prefix and replace if necessary
|
|
if ($this->swap_pre != '' && strncmp($item, $this->swap_pre, strlen($this->swap_pre)) === 0)
|
|
{
|
|
$item = preg_replace("/^".$this->swap_pre."(\S+?)/", $this->dbprefix."\\1", $item);
|
|
}
|
|
|
|
// Do we prefix an item with no segments?
|
|
if ($prefix_single == TRUE AND substr($item, 0, strlen($this->dbprefix)) != $this->dbprefix)
|
|
{
|
|
$item = $this->dbprefix.$item;
|
|
}
|
|
}
|
|
|
|
if ($protect_identifiers === TRUE AND ! in_array($item, $this->_reserved_identifiers))
|
|
{
|
|
$item = $this->_escape_identifiers($item);
|
|
}
|
|
|
|
return $item.$alias;
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
/* End of file DB_driver.php */
|
|
/* Location: ./system/database/DB_driver.php */ |