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+++ b/library/smarty/demo/plugins/cacheresource.mysql.php
@@ -0,0 +1,155 @@
+<?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();
+    }
+}