extension.cache.mysql.php

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<?php
//  available at http://getid3.sourceforge.net                 //
//            or http://www.getid3.org                         //
//          also https://github.com/JamesHeinrich/getID3       //
//                                                             //
// extension.cache.mysql.php - part of getID3()                //
// Please see readme.txt for more information                  //
//                                                            ///
//                                                             //
// This extension written by Allan Hansen <ahØartemis*dk>      //
// Table name mod by Carlo Capocasa <calroØcarlocapocasa*com>  //
//                                                            ///


class getID3_cached_mysql extends getID3
{

        // private vars
        private $cursor;
        private $connection;


        // public: constructor - see top of this file for cache type and cache_options
        public function __construct($host, $database, $username, $password, $table='getid3_cache') {

                // Check for mysql support
                if (!function_exists('mysql_pconnect')) {
                        throw new Exception('PHP not compiled with mysql support.');
                }

                // Connect to database
                $this->connection = mysql_pconnect($host, $username, $password);
                if (!$this->connection) {
                        throw new Exception('mysql_pconnect() failed - check permissions and spelling.');
                }

                // Select database
                if (!mysql_select_db($database, $this->connection)) {
                        throw new Exception('Cannot use database '.$database);
                }

                // Set table
                $this->table = $table;

                // Create cache table if not exists
                $this->create_table();

                // Check version number and clear cache if changed
                $version = '';
                $SQLquery  = 'SELECT `value`';
                $SQLquery .= ' FROM `'.mysql_real_escape_string($this->table).'`';
                $SQLquery .= ' WHERE (`filename` = \''.mysql_real_escape_string(getID3::VERSION).'\')';
                $SQLquery .= ' AND (`filesize` = -1)';
                $SQLquery .= ' AND (`filetime` = -1)';
                $SQLquery .= ' AND (`analyzetime` = -1)';
                if ($this->cursor = mysql_query($SQLquery, $this->connection)) {
                        list($version) = mysql_fetch_array($this->cursor);
                }
                if ($version != getID3::VERSION) {
                        $this->clear_cache();
                }

                parent::__construct();
        }



        // public: clear cache
        public function clear_cache() {

                $this->cursor = mysql_query('DELETE FROM `'.mysql_real_escape_string($this->table).'`', $this->connection);
                $this->cursor = mysql_query('INSERT INTO `'.mysql_real_escape_string($this->table).'` VALUES (\''.getID3::VERSION.'\', -1, -1, -1, \''.getID3::VERSION.'\')', $this->connection);
        }



        // public: analyze file
        public function analyze($filename, $filesize=null, $original_filename='') {

                if (file_exists($filename)) {

                        // Short-hands
                        $filetime = filemtime($filename);
                        $filesize =  filesize($filename);

                        // Lookup file
                        $SQLquery  = 'SELECT `value`';
                        $SQLquery .= ' FROM `'.mysql_real_escape_string($this->table).'`';
                        $SQLquery .= ' WHERE (`filename` = \''.mysql_real_escape_string($filename).'\')';
                        $SQLquery .= '   AND (`filesize` = \''.mysql_real_escape_string($filesize).'\')';
                        $SQLquery .= '   AND (`filetime` = \''.mysql_real_escape_string($filetime).'\')';
                        $this->cursor = mysql_query($SQLquery, $this->connection);
                        if (mysql_num_rows($this->cursor) > 0) {
                                // Hit
                                list($result) = mysql_fetch_array($this->cursor);
                                return unserialize(base64_decode($result));
                        }
                }

                // Miss
                $analysis = parent::analyze($filename, $filesize, $original_filename);

                // Save result
                if (file_exists($filename)) {
                        $SQLquery  = 'INSERT INTO `'.mysql_real_escape_string($this->table).'` (`filename`, `filesize`, `filetime`, `analyzetime`, `value`) VALUES (';
                        $SQLquery .=   '\''.mysql_real_escape_string($filename).'\'';
                        $SQLquery .= ', \''.mysql_real_escape_string($filesize).'\'';
                        $SQLquery .= ', \''.mysql_real_escape_string($filetime).'\'';
                        $SQLquery .= ', \''.mysql_real_escape_string(time()   ).'\'';
                        $SQLquery .= ', \''.mysql_real_escape_string(base64_encode(serialize($analysis))).'\')';
                        $this->cursor = mysql_query($SQLquery, $this->connection);
                }
                return $analysis;
        }



        // private: (re)create sql table
        private function create_table($drop=false) {

                $SQLquery  = 'CREATE TABLE IF NOT EXISTS `'.mysql_real_escape_string($this->table).'` (';
                $SQLquery .=   '`filename` VARCHAR(990) NOT NULL DEFAULT \'\'';
                $SQLquery .= ', `filesize` INT(11) NOT NULL DEFAULT \'0\'';
                $SQLquery .= ', `filetime` INT(11) NOT NULL DEFAULT \'0\'';
                $SQLquery .= ', `analyzetime` INT(11) NOT NULL DEFAULT \'0\'';
                $SQLquery .= ', `value` LONGTEXT NOT NULL';
                $SQLquery .= ', PRIMARY KEY (`filename`, `filesize`, `filetime`)) ENGINE=MyISAM CHARACTER SET=latin1 COLLATE=latin1_general_ci';
                $this->cursor = mysql_query($SQLquery, $this->connection);
                echo mysql_error($this->connection);
        }
}