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<?php
// +----------------------------------------------------------------------+
// | PEAR :: Cache                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | license@php.net so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Ulf Wendel <ulf.wendel@phpdoc.de>                           |
// |          Sebastian Bergmann <sb@sebastian-bergmann.de>               |
// +----------------------------------------------------------------------+
//
// $Id: phplib.php 174777 2004-12-15 09:09:33Z dufuz $

require_once 'Cache/Container.php';

/**
* Stores cache data into a database table using PHPLibs DB abstraction.
*
* WARNING: Other systems might or might not support certain datatypes of 
* the tables shown. As far as I know there's no large binary 
* type in SQL-92 or SQL-99. Postgres seems to lack any 
* BLOB or TEXT type, for MS-SQL you could use IMAGE, don't know 
* about other databases. Please add sugestions for other databases to 
* the inline docs.
*
* The field 'changed' is used by the garbage collection. Depending on 
* your databasesystem you might have to subclass fetch() and garbageCollection().
*
* For _MySQL_ you need this DB table:
*
* CREATE TABLE cache (
*   id          CHAR(32) NOT null DEFAULT '',
*   cachegroup  VARCHAR(127) NOT null DEFAULT '',
*   cachedata   BLOB NOT null DEFAULT '',
*   userdata    VARCHAR(255) NOT null DEFAUL '',
*   expires     INT(9) NOT null DEFAULT 0,
*  
*   changed     TIMESTAMP(14) NOT null,
*  
*   INDEX (expires),
*   PRIMARY KEY (id, cachegroup)
* )
*

* @author   Ulf Wendel  <ulf.wendel@phpdoc.de>, Sebastian Bergmann <sb@sebastian-bergmann.de>
* @version  $Id: phplib.php 174777 2004-12-15 09:09:33Z dufuz $
* @package  Cache
* @see      save()
*/
class Cache_Container_phplib extends Cache_Container
{
    
/**
    * Name of the DB table to store caching data
    * 
    * @see  Cache_Container_file::$filename_prefix
    */  
    
var $cache_table 'cache';

    
/**
    * PHPLib object
    * 
    * @var  object PEAR_DB
    */
    
var $db;

    
/**
    * Name of the PHPLib DB class to use
    * 
    * @var  string  
    * @see  $db_path, $local_path
    */
    
var $db_class '';

    
/**
    * Filename of your local.inc
    * 
    * If empty, 'local.inc' is assumed.
    *
    * @var       string
    */
    
var $local_file '';

    
/**
    * Include path for you local.inc
    *
    * HINT: If your're not using PHPLib's prepend.php you must 
    * take care that all classes (files) references by you 
    * local.inc are included automatically. So you might 
    * want to write a new local2.inc that only referrs to 
    * the database class (file) you're using and includes all required files.
    *
    * @var  string  path to your local.inc - make sure to add a trailing slash
    * @see  $local_file
    */
    
var $local_path '';

    
/**
    * Creates an instance of a phplib db class to use it for storage.
    *
    * @param    mixed   If empty the object tries to used the 
    *                   preconfigured class variables. If given it 
    *                   must be an array with:
    *                     db_class => name of the DB class to use
    *                   optional:
    *                     db_file => filename of the DB class
    *                     db_path => path to the DB class
    *                     local_file => kind of local.inc
    *                     local_patk => path to the local.inc
    *                   see $local_path for some hints.s
    * @see  $local_path
    */
    
function Cache_Container_phplib($options '')
    {
        if (
is_array($options)) {
            
$this->setOptions($options,  array_merge($this->allowed_options, array('db_class''db_file''db_path''local_file''local_path')));
        }
        if (!
$this->db_class) {
            return new 
Cache_Error('No database class specified.'__FILE____LINE__);
        }
        
// include the required files
        
if ($this->db_file) {
            include_once 
$this->db_path $this->db_file;
        }
        if (
$this->local_file) {
            include_once 
$this->local_path $this->local_file;
        }
        
// create a db object 
        
$this->db = new $this->db_class;
    } 
// end constructor

    
function fetch($id$group)
    {
        
$query sprintf("SELECT expires, cachedata, userdata FROM %s WHERE id = '%s' AND cachegroup = '%s'",
                            
$this->cache_table
                            
$id,
                            
$group
                         
);
        
$this->db->query($query);
        if (!
$this->db->Next_Record()) {
            return array(
nullnullnull);
        }
        
// last used required by the garbage collection   
        // WARNING: might be MySQL specific         
        
$query sprintf("UPDATE %s SET changed = (NOW() + 0) WHERE id = '%s' AND cachegroup = '%s'",
                            
$this->cache_table,
                            
$id,
                            
$group
                          
);
        
$this->db->query($query);
        return array(
$this->db->f('expires'), $this->decode($this->db->f('cachedata')), $this->db->f('userdata'));
    } 
// end func fetch

    /**
    * Stores a dataset.
    * 
    * WARNING: we use the SQL command REPLACE INTO this might be 
    * MySQL specific. As MySQL is very popular the method should
    * work fine for 95% of you.
    */
    
function save($id$data$expires$group)
    {
        
$this->flushPreload($id$group);

        
$query sprintf("REPLACE INTO %s (cachedata, expires, id, cachegroup) VALUES ('%s', %d, '%s', '%s')",
                            
$this->cache_table,
                            
addslashes($this->encode($data)),
                            
$this->getExpiresAbsolute($expires) ,
                            
$id,
                            
$group
                         
);
        
$this->db->query($query);

        return (boolean)
$this->db->affected_rows(); 
    } 
// end func save

    
function remove($id$group)
    {
        
$this->flushPreload($id$group);
        
$this->db->query(
                        
sprintf("DELETE FROM %s WHERE id = '%s' AND cachegroup = '%s'",
                            
$this->cache_table,
                            
$id,
                            
$group
                          
)
                    );

        return (boolean)
$this->db->affected_rows();
    } 
// end func remove

    
function flush($group)
    {
        
$this->flushPreload();

        if (
$group) {
            
$this->db->query(sprintf("DELETE FROM %s WHERE cachegroup = '%s'"$this->cache_table$group));    
        } else {
            
$this->db->query(sprintf("DELETE FROM %s"$this->cache_table));    
        }

        return 
$this->db->affected_rows();
    } 
// end func flush

    
function idExists($id$group)
    {
        
$this->db->query(
                        
sprintf("SELECT id FROM %s WHERE ID = '%s' AND cachegroup = '%s'"
                            
$this->cache_table,
                            
$id
                            
$group
                        
)   
                    );

        return (boolean)
$this->db->nf();                         
    } 
// end func isExists

    
function garbageCollection($maxlifetime)
    {
        
$this->flushPreload();

        
$this->db->query
                        
sprintf("DELETE FROM %s WHERE (expires <= %d AND expires > 0) OR changed <= (NOW() - %d)",
                            
$this->cache_table
                            
time(),
                            
$maxlifetime
                        
)
                    );

        
//check for total size of cache
        
$query sprintf('select sum(length(cachedata)) as CacheSize from %s',
                         
$this->cache_table
                       
);

        
$this->db->query($query);
        
$this->db->Next_Record();
        
$cachesize $this->db->f('CacheSize');
        
//if cache is to big.
        
if ($cachesize $this->highwater) {
            
//find the lowwater mark.
            
$query sprintf('select length(cachedata) as size, changed from %s order by changed DESC',
                                     
$this->cache_table
                       
);
            
$this->db->query($query);

            
$keep_size=0;
            while (
$keep_size $this->lowwater && $this->db->Next_Record()) {
                
$keep_size += $this->db->f('size');
            }
            
//delete all entries, which were changed before the "lowwwater mark"
            
$query sprintf('delete from %s where changed <= '.$this->db->f('changed'),
                                     
$this->cache_table
                                   
);

            
$this->db->query($query);
        }
    } 
// end func garbageCollection
}
?>

:: Command execute ::

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