diff --git a/library/smarty/demo/plugins/cacheresource.mysql.php b/library/smarty/demo/plugins/cacheresource.mysql.php
deleted file mode 100644
--- a/library/smarty/demo/plugins/cacheresource.mysql.php
+++ /dev/null
@@ -1,155 +0,0 @@
-<?php
-
-/**
- * MySQL CacheResource
- * CacheResource Implementation based on the Custom API to use
- * MySQL as the storage resource for Smarty's output caching.
- * Table definition:
- * <pre>CREATE TABLE IF NOT EXISTS `output_cache` (
- *   `id` CHAR(40) NOT NULL COMMENT 'sha1 hash',
- *   `name` VARCHAR(250) NOT NULL,
- *   `cache_id` VARCHAR(250) NULL DEFAULT NULL,
- *   `compile_id` VARCHAR(250) NULL DEFAULT NULL,
- *   `modified` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
- *   `content` LONGTEXT NOT NULL,
- *   PRIMARY KEY (`id`),
- *   INDEX(`name`),
- *   INDEX(`cache_id`),
- *   INDEX(`compile_id`),
- *   INDEX(`modified`)
- * ) ENGINE = InnoDB;</pre>
- *
- * @package CacheResource-examples
- * @author  Rodney Rehm
- */
-class Smarty_CacheResource_Mysql extends Smarty_CacheResource_Custom {
-    // PDO instance
-    protected $db;
-    protected $fetch;
-    protected $fetchTimestamp;
-    protected $save;
-
-    public function __construct() {
-        try {
-            $this->db = new PDO("mysql:dbname=test;host=127.0.0.1", "smarty");
-        } catch (PDOException $e) {
-            throw new SmartyException('Mysql Resource failed: ' . $e->getMessage());
-        }
-        $this->fetch = $this->db->prepare('SELECT modified, content FROM output_cache WHERE id = :id');
-        $this->fetchTimestamp = $this->db->prepare('SELECT modified FROM output_cache WHERE id = :id');
-        $this->save = $this->db->prepare('REPLACE INTO output_cache (id, name, cache_id, compile_id, content)
-            VALUES  (:id, :name, :cache_id, :compile_id, :content)');
-    }
-
-    /**
-     * fetch cached content and its modification time from data source
-     *
-     * @param  string $id unique cache content identifier
-     * @param  string $name template name
-     * @param  string $cache_id cache id
-     * @param  string $compile_id compile id
-     * @param  string $content cached content
-     * @param  integer $mtime cache modification timestamp (epoch)
-     *
-     * @return void
-     */
-    protected function fetch($id, $name, $cache_id, $compile_id, &$content, &$mtime) {
-        $this->fetch->execute(array('id' => $id));
-        $row = $this->fetch->fetch();
-        $this->fetch->closeCursor();
-        if ($row) {
-            $content = $row['content'];
-            $mtime = strtotime($row['modified']);
-        } else {
-            $content = null;
-            $mtime = null;
-        }
-    }
-
-    /**
-     * Fetch cached content's modification timestamp from data source
-     *
-     * @note implementing this method is optional. Only implement it if modification times can be accessed faster than loading the complete cached content.
-     *
-     * @param  string $id unique cache content identifier
-     * @param  string $name template name
-     * @param  string $cache_id cache id
-     * @param  string $compile_id compile id
-     *
-     * @return integer|boolean timestamp (epoch) the template was modified, or false if not found
-     */
-    protected function fetchTimestamp($id, $name, $cache_id, $compile_id) {
-        $this->fetchTimestamp->execute(array('id' => $id));
-        $mtime = strtotime($this->fetchTimestamp->fetchColumn());
-        $this->fetchTimestamp->closeCursor();
-
-        return $mtime;
-    }
-
-    /**
-     * Save content to cache
-     *
-     * @param  string $id unique cache content identifier
-     * @param  string $name template name
-     * @param  string $cache_id cache id
-     * @param  string $compile_id compile id
-     * @param  integer|null $exp_time seconds till expiration time in seconds or null
-     * @param  string $content content to cache
-     *
-     * @return boolean      success
-     */
-    protected function save($id, $name, $cache_id, $compile_id, $exp_time, $content) {
-        $this->save->execute(array(
-            'id' => $id,
-            'name' => $name,
-            'cache_id' => $cache_id,
-            'compile_id' => $compile_id,
-            'content' => $content,
-        ));
-
-        return !!$this->save->rowCount();
-    }
-
-    /**
-     * Delete content from cache
-     *
-     * @param  string $name template name
-     * @param  string $cache_id cache id
-     * @param  string $compile_id compile id
-     * @param  integer|null $exp_time seconds till expiration or null
-     *
-     * @return integer      number of deleted caches
-     */
-    protected function delete($name, $cache_id, $compile_id, $exp_time) {
-        // delete the whole cache
-        if ($name === null && $cache_id === null && $compile_id === null && $exp_time === null) {
-            // returning the number of deleted caches would require a second query to count them
-            $query = $this->db->query('TRUNCATE TABLE output_cache');
-
-            return -1;
-        }
-        // build the filter
-        $where = array();
-        // equal test name
-        if ($name !== null) {
-            $where[] = 'name = ' . $this->db->quote($name);
-        }
-        // equal test compile_id
-        if ($compile_id !== null) {
-            $where[] = 'compile_id = ' . $this->db->quote($compile_id);
-        }
-        // range test expiration time
-        if ($exp_time !== null) {
-            $where[] = 'modified < DATE_SUB(NOW(), INTERVAL ' . intval($exp_time) . ' SECOND)';
-        }
-        // equal test cache_id and match sub-groups
-        if ($cache_id !== null) {
-            $where[] = '(cache_id = ' . $this->db->quote($cache_id)
-                . ' OR cache_id LIKE ' . $this->db->quote($cache_id . '|%') . ')';
-        }
-        // run delete query
-        $query = $this->db->query('DELETE FROM output_cache WHERE ' . join(' AND ', $where));
-
-        return $query->rowCount();
-    }
-}