mirror of
https://github.com/Yetangitu/ampache
synced 2025-10-03 17:59:21 +02:00
119 lines
2.9 KiB
PHP
119 lines
2.9 KiB
PHP
<?php
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/*
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Copyright (c) Ampache.org
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All rights reserved.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License v2
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as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/**
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* database_object
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* This is a general object that is extended by all of the basic
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* database based objects in ampache. It attempts to do some standard
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* caching for all of the objects to cut down on the database calls
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*/
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abstract class database_object {
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private static $object_cache = array();
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// Statistics for debugging
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public static $cache_hit = 0;
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/**
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* get_info
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* retrieves the info from the database and puts it in the cache
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*
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* @param string $id
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* @param string $table_name
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* @return array
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*/
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public function get_info($id,$table_name='') {
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$table_name = $table_name ? Dba::escape($table_name) : Dba::escape(strtolower(get_class($this)));
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if (self::is_cached($table_name,$id)) {
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return self::get_from_cache($table_name,$id);
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}
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$sql = "SELECT * FROM `$table_name` WHERE `id`='$id'";
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$db_results = Dba::query($sql);
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if (!$db_results) { return array(); }
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$row = Dba::fetch_assoc($db_results);
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self::add_to_cache($table_name,$id,$row);
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return $row;
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} // get_info
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/**
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* is_cached
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* this checks the cache to see if the specified object is there
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*/
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public static function is_cached($index,$id) {
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return isset(self::$object_cache[$index][$id]);
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} // is_cached
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/**
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* get_from_cache
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* This attempts to retrive the specified object from the cache we've got here
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*
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* @param string $index
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* @param string $id
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* @return array
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*/
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public static function get_from_cache($index,$id) {
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// Check if the object is set
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if (isset(self::$object_cache)
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&& isset(self::$object_cache[$index])
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&& isset(self::$object_cache[$index][$id])
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) {
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self::$cache_hit++;
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return self::$object_cache[$index][$id];
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}
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return false;
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} // get_from_cache
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/**
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* add_to_cache
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* This adds the specified object to the specified index in the cache
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*
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* @param string $index
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* @param string $id
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* @param array $data
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* @return boolean
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*/
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public static function add_to_cache($index,$id,$data) {
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$hasbeenset = false;
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// Set the data if it is set
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if (isset($data)) {
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self::$object_cache[$index][$id] = $data;
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$hasbeenset = true;
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}
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return $hasbeenset;
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} // add_to_cache
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} // end database_object
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