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								<?xml version="1.0" encoding="iso-8859-1"?>
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								<!-- $Revision$ -->
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								  <sect1 id="section.template.cache.handler.func">
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								   <title>Funci<EFBFBD>n manipuladora de cache</title>
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								   <para>
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								    Como una alternativa al uso del mecanismo de caching por default basado 
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								    en archivo, usted puede especificar una funci<63>n habitual de manipulaci<63>n 
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								    de cache que ser<65> usada para leer, escribir y limpar archivos de cache.
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								   </para>
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								   <para>
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								    Cree una funci<63>n en su aplicaci<63>n para que Smarty la use como un
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								    manipulador de cache. Defina el nombre de la variable de clase en el
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								    <link linkend="variable.cache.handler.func">$cache_handler_func</link>.
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								    El Smarty ahora usara esta para manipular datos en el cache. El primer 
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								    par<61>metro es la acci<63>n, que puede ser uno de estos 'read', 'write' y 
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								    'clear'. El segundo par<61>metro es el objeto de Smarty. El tercer par<61>metro 
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								    es el contenido que esta en el cache.  Sobre 'write', el Smarty pasa el 
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								    contenido en cache en estos par<61>metros.  sobre 'read', el Smarty espera 
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								    que su funci<63>n acepte este par<61>metro por referencia y poblar estos con los 
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								    datos en cache.  Sobre 'clear', el Smarty pasa una variable en cero desde 
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								    aqu<71> que esta no es usada. El cuarto par<61>metro es el nombre del archivo de 
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								    template(necesario para leer/escribir). El quinto par<61>metro es la cache_id 
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								    (opcional). El sexto par<61>metro es la compile_id (opcional).
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								   </para>
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								   <para>
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								    NOTA: El ultimo par<61>metro ($exp_time) fue adicionado en el Smarty-2.6.0.
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								   </para>
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								   <example>
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								    <title> ejemplo usando MySQL como una fuente de cache</title>
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								    <programlisting role="php">
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								<![CDATA[
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								<?php
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								/*
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								ejemplo de uso:
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								include('Smarty.class.php');
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								include('mysql_cache_handler.php');
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								$smarty = new Smarty;
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								$smarty->cache_handler_func = 'mysql_cache_handler';
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								$smarty->display('index.tpl');
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								mysql database is expected in this format:
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								create database SMARTY_CACHE;
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								create table CACHE_PAGES(
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								CacheID char(32) PRIMARY KEY,
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								CacheContents MEDIUMTEXT NOT NULL
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								);
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								*/
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								function mysql_cache_handler($action, &$smarty_obj, &$cache_content, $tpl_file=null, $cache_id=null, $compile_id=null, $exp_time=null)
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								{
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									// set db host, user and pass here
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									$db_host = 'localhost';
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									$db_user = 'myuser';
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									$db_pass = 'mypass';
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									$db_name = 'SMARTY_CACHE';
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									$use_gzip = false;
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									// create unique cache id
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									$CacheID = md5($tpl_file.$cache_id.$compile_id);
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									if(! $link = mysql_pconnect($db_host, $db_user, $db_pass)) {
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										$smarty_obj->_trigger_error_msg("cache_handler: could not connect to database");
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										return false;
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									}
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									mysql_select_db($db_name);
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									switch ($action) {
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										case 'read':
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											// read cache from database
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											$results = mysql_query("select CacheContents from CACHE_PAGES where CacheID='$CacheID'");
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											if(!$results) {
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												$smarty_obj->_trigger_error_msg("cache_handler: query failed.");			
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											}
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											$row = mysql_fetch_array($results,MYSQL_ASSOC);
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											if($use_gzip && function_exists("gzuncompress")) {
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												$cache_content = gzuncompress($row["CacheContents"]);
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											} else {
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												$cache_content = $row["CacheContents"];
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											2004-10-07 18:50:52 +00:00
										 
									 
								 
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											}
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											$return = $results;
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											break;
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										case 'write':
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											// save cache to database
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											if($use_gzip && function_exists("gzcompress")) {
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												// compress the contents for storage efficiency
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												$contents = gzcompress($cache_content);
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											} else {
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												$contents = $cache_content;
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											}
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											$results = mysql_query("replace into CACHE_PAGES values(
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															'$CacheID',
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															'".addslashes($contents)."')
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														");
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											if(!$results) {
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												$smarty_obj->_trigger_error_msg("cache_handler: query failed.");			
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											}
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											$return = $results;
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											break;
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										case 'clear':
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											// clear cache info
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											if(empty($cache_id) && empty($compile_id) && empty($tpl_file)) {
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												// clear them all
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												$results = mysql_query("delete from CACHE_PAGES");			
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											} else {
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												$results = mysql_query("delete from CACHE_PAGES where CacheID='$CacheID'");			
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											}
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											if(!$results) {
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												$smarty_obj->_trigger_error_msg("cache_handler: query failed.");			
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											}
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											$return = $results;
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											break;
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										default:
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											// error, unknown action
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											$smarty_obj->_trigger_error_msg("cache_handler: unknown action \"$action\"");
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											$return = false;
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											break;
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									}
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									mysql_close($link);
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								 | 
							
							
									return $return;
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
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								 | 
							
							
									
							 | 
						
					
						
							| 
								
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							 | 
							
								
									
								 | 
							
							
								}
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								
							 | 
						
					
						
							| 
								
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							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								?>
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								 | 
							
							
								]]>
							 | 
						
					
						
							| 
								
							 | 
							
								
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							 | 
							
								
									
								 | 
							
							
								</programlisting>
							 | 
						
					
						
							| 
								
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							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								    </example>
							 | 
						
					
						
							| 
								
							 | 
							
								
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							 | 
							
								
									
								 | 
							
							
								</sect1>
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								<!-- Keep this comment at the end of the file
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								Local variables:
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								mode: sgml
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								sgml-omittag:t
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								sgml-shorttag:t
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								sgml-minimize-attributes:nil
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								sgml-always-quote-attributes:t
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								sgml-indent-step:1
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								sgml-indent-data:t
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								indent-tabs-mode:nil
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								sgml-parent-document:nil
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								sgml-default-dtd-file:"../../../../manual.ced"
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								sgml-exposed-tags:nil
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								sgml-local-catalogs:nil
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								sgml-local-ecat-files:nil
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								End:
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								vim600: syn=xml fen fdm=syntax fdl=2 si
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								vim: et tw=78 syn=sgml
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								vi: ts=1 sw=1
							 | 
						
					
						
							| 
								
							 | 
							
								
							 | 
							
								
							 | 
							
								
									
								 | 
							
							
								-->
							 |