source: extensions/charlies_content/getid3/getid3/extension.cache.mysql.php @ 3318

Revision 3318, 6.4 KB checked in by vdigital, 11 years ago (diff)

+ Add Charlies' content to depository

  • Property svn:keywords set to Author Date Id Revision
Line 
1<?php
2// +----------------------------------------------------------------------+
3// | PHP version 5                                                        |
4// +----------------------------------------------------------------------+
5// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen                 |
6// +----------------------------------------------------------------------+
7// | This source file is subject to version 2 of the GPL license,         |
8// | that is bundled with this package in the file license.txt and is     |
9// | available through the world-wide-web at the following url:           |
10// | http://www.gnu.org/copyleft/gpl.html                                 |
11// +----------------------------------------------------------------------+
12// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org    |
13// +----------------------------------------------------------------------+
14// | Authors: James Heinrich <infoØgetid3*org>                            |
15// |          Allan Hansen <ahØartemis*dk>                                |
16// +----------------------------------------------------------------------+
17// | extension.cache.mysql.php                                            |
18// | MySQL Cache Extension.                                               |
19// | dependencies: getid3.                                                |
20// +----------------------------------------------------------------------+
21//
22// $Id$
23
24
25/**
26* This is a caching extension for getID3(). It works the exact same
27* way as the getID3 class, but return cached information very fast
28*
29* Example:  (see also demo.cache.mysql.php in /demo/)
30*
31*    Normal getID3 usage (example):
32*
33*       require_once 'getid3/getid3.php';
34*       $getid3 = new getid3;
35*       $getid3->encoding = 'UTF-8';
36*       try {
37*           $info1 = $getid3->Analyse('file1.flac');
38*           $info2 = $getid3->Analyse('file2.wv');
39*           ....
40*
41*    getID3_cached usage:
42*
43*       require_once 'getid3/getid3.php';
44*       require_once 'getid3/getid3/extension.cache.mysql.php';
45*       $getid3 = new getid3_cached_mysql('localhost', 'database', 'username', 'password');
46*       $getid3->encoding = 'UTF-8';
47*       try {
48*           $info1 = $getid3->analyse('file1.flac');
49*           $info2 = $getid3->analyse('file2.wv');
50*           ...
51*
52*
53* Supported Cache Types    (this extension)
54*
55*   SQL Databases:
56*
57*   cache_type          cache_options
58*   -------------------------------------------------------------------
59*   mysql               host, database, username, password
60*
61*
62*   DBM-Style Databases:    (use extension.cache.dbm)
63*
64*   cache_type          cache_options
65*   -------------------------------------------------------------------
66*   gdbm                dbm_filename, lock_filename
67*   ndbm                dbm_filename, lock_filename
68*   db2                 dbm_filename, lock_filename
69*   db3                 dbm_filename, lock_filename
70*   db4                 dbm_filename, lock_filename  (PHP5 required)
71*
72*   PHP must have write access to both dbm_filename and lock_filename.
73*
74*
75* Recommended Cache Types
76*
77*   Infrequent updates, many reads      any DBM
78*   Frequent updates                    mysql
79*/
80
81
82class getid3_cached_mysql extends getID3
83{
84
85    private $cursor;
86    private $connection;
87
88
89    public function __construct($host, $database, $username, $password) {
90
91        // Check for mysql support
92        if (!function_exists('mysql_pconnect')) {
93            throw new getid3_exception('PHP not compiled with mysql support.');
94        }
95
96        // Connect to database
97        $this->connection = @mysql_pconnect($host, $username, $password);
98        if (!$this->connection) {
99            throw new getid3_exception('mysql_pconnect() failed - check permissions and spelling.');
100        }
101
102        // Select database
103        if (!@mysql_select_db($database, $this->connection)) {
104            throw new getid3_exception('Cannot use database '.$database);
105        }
106
107        // Create cache table if not exists
108        $this->create_table();
109
110        // Check version number and clear cache if changed
111        $this->cursor = mysql_query("SELECT `value` FROM `getid3_cache` WHERE (`filename` = '".getid3::VERSION."') AND (`filesize` = '-1') AND (`filetime` = '-1') AND (`analyzetime` = '-1')", $this->connection);
112        list($version) = @mysql_fetch_array($this->cursor);
113        if ($version != getid3::VERSION) {
114            $this->clear_cache();
115        }
116
117        parent::__construct();
118    }
119
120
121
122    public function clear_cache() {
123
124        $this->cursor = mysql_query("DELETE FROM `getid3_cache`", $this->connection);
125        $this->cursor = mysql_query("INSERT INTO `getid3_cache` VALUES ('".getid3::VERSION."', -1, -1, -1, '".getid3::VERSION."')", $this->connection);
126    }
127
128
129
130    public function Analyze($filename) {
131
132        if (file_exists($filename)) {
133
134            // Short-hands
135            $filetime = filemtime($filename);
136            $filesize = filesize($filename);
137            $filenam2 = mysql_escape_string($filename);
138
139            // Loopup file
140            $this->cursor = mysql_query("SELECT `value` FROM `getid3_cache` WHERE (`filename`='".$filenam2."') AND (`filesize`='".$filesize."') AND (`filetime`='".$filetime."')", $this->connection);
141            list($result) = @mysql_fetch_array($this->cursor);
142
143            // Hit
144            if ($result) {
145                return unserialize($result);
146            }
147        }
148
149        // Miss
150        $result = parent::Analyze($filename);
151
152        // Save result
153        if (file_exists($filename)) {
154            $res2 = mysql_escape_string(serialize($result));
155            $this->cursor = mysql_query("INSERT INTO `getid3_cache` (`filename`, `filesize`, `filetime`, `analyzetime`, `value`) VALUES ('".$filenam2."', '".$filesize."', '".$filetime."', '".time()."', '".$res2."')", $this->connection);
156        }
157        return $result;
158    }
159
160
161
162    // (re)create sql table
163    private function create_table($drop = false) {
164
165        $this->cursor = mysql_query("CREATE TABLE IF NOT EXISTS `getid3_cache` (
166            `filename` VARCHAR(255) NOT NULL DEFAULT '',
167            `filesize` INT(11) NOT NULL DEFAULT '0',
168            `filetime` INT(11) NOT NULL DEFAULT '0',
169            `analyzetime` INT(11) NOT NULL DEFAULT '0',
170            `value` TEXT NOT NULL,
171            PRIMARY KEY (`filename`,`filesize`,`filetime`)) TYPE=MyISAM", $this->connection);
172        echo mysql_error($this->connection);
173    }
174}
175
176
177?>
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