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+Resources {#plugins.resources}
+=========
+
+Resource plugins are meant as a generic way of providing template
+sources or PHP script components to Smarty. Some examples of resources:
+databases, LDAP, shared memory, sockets, and so on.
+
+Custom Resources may be put in a file `resource.foobarxyz.php` within
+your [`$plugins_dir`](#variable.plugins.dir), or registered on runtime
+with [`registerResource()`](#api.register.resource). In either case you
+will be able to access that resource by prepending its name to the
+template you\'re addressing: `foobarxyz:yourtemplate.tpl`.
+
+If a Resource\'s templates should not be run through the Smarty
+compiler, the Custom Resource may extend `Smarty_Resource_Uncompiled`.
+The Resource Handler must then implement the function
+`renderUncompiled(Smarty_Internal_Template $_template)`. `$_template` is
+a reference to the current template and contains all assigned variables
+which the implementor can access via
+`$_template->smarty->getTemplateVars()`. These Resources simply echo
+their rendered content to the output stream. The rendered output will be
+output-cached if the Smarty instance was configured accordingly. See
+`libs/sysplugins/smarty_internal_resource_php.php` for an example.
+
+If the Resource\'s compiled templates should not be cached on disk, the
+Custom Resource may extend `Smarty_Resource_Recompiled`. These Resources
+are compiled every time they are accessed. This may be an expensive
+overhead. See `libs/sysplugins/smarty_internal_resource_eval.php` for an
+example.
+
+
+    <?php
+
+    /**
+     * MySQL Resource
+     *
+     * Resource Implementation based on the Custom API to use
+     * MySQL as the storage resource for Smarty's templates and configs.
+     *
+     * Table definition:
+     * <pre>CREATE TABLE IF NOT EXISTS `templates` (
+     *   `name` varchar(100) NOT NULL,
+     *   `modified` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+     *   `source` text,
+     *   PRIMARY KEY (`name`)
+     * ) ENGINE=InnoDB DEFAULT CHARSET=utf8;</pre>
+     *
+     * Demo data:
+     * <pre>INSERT INTO `templates` (`name`, `modified`, `source`) VALUES ('test.tpl', "2010-12-25 22:00:00", '{$x="hello world"}{$x}');</pre>
+     *
+     * @package Resource-examples
+     * @author Rodney Rehm
+     */
+    class Smarty_Resource_Mysql extends Smarty_Resource_Custom {
+        // PDO instance
+        protected $db;
+        // prepared fetch() statement
+        protected $fetch;
+        // prepared fetchTimestamp() statement
+        protected $mtime;
+
+        public function __construct() {
+            try {
+                $this->db = new PDO("mysql:dbname=test;host=127.0.0.1", "smarty", "smarty");
+            } catch (PDOException $e) {
+                throw new SmartyException('Mysql Resource failed: ' . $e->getMessage());
+            }
+            $this->fetch = $this->db->prepare('SELECT modified, source FROM templates WHERE name = :name');
+            $this->mtime = $this->db->prepare('SELECT modified FROM templates WHERE name = :name');
+        }
+        
+        /**
+         * Fetch a template and its modification time from database
+         *
+         * @param string $name template name
+         * @param string $source template source
+         * @param integer $mtime template modification timestamp (epoch)
+         * @return void
+         */
+        protected function fetch($name, &$source, &$mtime)
+        {
+            $this->fetch->execute(array('name' => $name));
+            $row = $this->fetch->fetch();
+            $this->fetch->closeCursor();
+            if ($row) {
+                $source = $row['source'];
+                $mtime = strtotime($row['modified']);
+            } else {
+                $source = null;
+                $mtime = null;
+            }
+        }
+        
+        /**
+         * Fetch a template's modification time from database
+         *
+         * @note implementing this method is optional. Only implement it if modification times can be accessed faster than loading the comple template source.
+         * @param string $name template name
+         * @return integer timestamp (epoch) the template was modified
+         */
+        protected function fetchTimestamp($name) {
+            $this->mtime->execute(array('name' => $name));
+            $mtime = $this->mtime->fetchColumn();
+            $this->mtime->closeCursor();
+            return strtotime($mtime);
+        }
+    }
+
+
+    require_once 'libs/Smarty.class.php';
+    $smarty = new Smarty();
+    $smarty->registerResource('mysql', new Smarty_Resource_Mysql());
+
+    // using resource from php script
+    $smarty->display("mysql:index.tpl");
+    ?>
+
+         
+
+And from within Smarty template:
+
+
+    {include file='mysql:extras/navigation.tpl'}
+
+         
+
+See also [`registerResource()`](#api.register.resource),
+[`unregisterResource()`](#api.unregister.resource).