mirror of
https://github.com/alextselegidis/easyappointments.git
synced 2024-12-24 15:43:04 +03:00
196 lines
No EOL
4.4 KiB
PHP
196 lines
No EOL
4.4 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 EllisLab Dev Team
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* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc.
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* @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
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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 Cache Class
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*
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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_Cache {
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var $CI;
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var $db; // allows passing of db object so that multiple database connections and returned db objects can be supported
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/**
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* Constructor
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*
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* Grabs the CI super object instance so we can access it.
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*
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*/
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function __construct(&$db)
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{
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// Assign the main CI object to $this->CI
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// and load the file helper since we use it a lot
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$this->CI =& get_instance();
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$this->db =& $db;
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$this->CI->load->helper('file');
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}
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// --------------------------------------------------------------------
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/**
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* Set Cache Directory Path
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*
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* @access public
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* @param string the path to the cache directory
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* @return bool
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*/
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function check_path($path = '')
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{
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if ($path == '')
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{
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if ($this->db->cachedir == '')
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{
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return $this->db->cache_off();
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}
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$path = $this->db->cachedir;
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}
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// Add a trailing slash to the path if needed
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$path = preg_replace("/(.+?)\/*$/", "\\1/", $path);
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if ( ! is_dir($path) OR ! is_really_writable($path))
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{
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// If the path is wrong we'll turn off caching
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return $this->db->cache_off();
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}
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$this->db->cachedir = $path;
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Retrieve a cached query
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*
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* The URI being requested will become the name of the cache sub-folder.
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* An MD5 hash of the SQL statement will become the cache file name
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*
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* @access public
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* @return string
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*/
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function read($sql)
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{
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if ( ! $this->check_path())
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{
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return $this->db->cache_off();
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}
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$segment_one = ($this->CI->uri->segment(1) == FALSE) ? 'default' : $this->CI->uri->segment(1);
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$segment_two = ($this->CI->uri->segment(2) == FALSE) ? 'index' : $this->CI->uri->segment(2);
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$filepath = $this->db->cachedir.$segment_one.'+'.$segment_two.'/'.md5($sql);
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if (FALSE === ($cachedata = read_file($filepath)))
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{
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return FALSE;
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}
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return unserialize($cachedata);
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}
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// --------------------------------------------------------------------
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/**
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* Write a query to a cache file
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*
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* @access public
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* @return bool
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*/
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function write($sql, $object)
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{
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if ( ! $this->check_path())
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{
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return $this->db->cache_off();
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}
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$segment_one = ($this->CI->uri->segment(1) == FALSE) ? 'default' : $this->CI->uri->segment(1);
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$segment_two = ($this->CI->uri->segment(2) == FALSE) ? 'index' : $this->CI->uri->segment(2);
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$dir_path = $this->db->cachedir.$segment_one.'+'.$segment_two.'/';
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$filename = md5($sql);
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if ( ! @is_dir($dir_path))
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{
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if ( ! @mkdir($dir_path, DIR_WRITE_MODE))
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{
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return FALSE;
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}
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@chmod($dir_path, DIR_WRITE_MODE);
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}
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if (write_file($dir_path.$filename, serialize($object)) === FALSE)
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{
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return FALSE;
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}
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@chmod($dir_path.$filename, FILE_WRITE_MODE);
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return TRUE;
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}
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// --------------------------------------------------------------------
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/**
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* Delete cache files within a particular directory
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*
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* @access public
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* @return bool
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*/
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function delete($segment_one = '', $segment_two = '')
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{
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if ($segment_one == '')
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{
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$segment_one = ($this->CI->uri->segment(1) == FALSE) ? 'default' : $this->CI->uri->segment(1);
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}
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if ($segment_two == '')
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{
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$segment_two = ($this->CI->uri->segment(2) == FALSE) ? 'index' : $this->CI->uri->segment(2);
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}
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$dir_path = $this->db->cachedir.$segment_one.'+'.$segment_two.'/';
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delete_files($dir_path, TRUE);
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}
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// --------------------------------------------------------------------
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/**
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* Delete all existing cache files
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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 delete_all()
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{
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delete_files($this->db->cachedir, TRUE);
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}
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}
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/* End of file DB_cache.php */
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/* Location: ./system/database/DB_cache.php */ |