php缓存技术

首先看看adodb提供的数据缓存功能：include(adodb.inc.php); # load code common to ADOdb$ADODB_CACHE_DIR = /usr/ADODB_cache;$conn = &ADONewConnection(mysql); # create a connection$conn->PConnect(‘localhost’,userid’,”,’agora’);# connect to MySQL, agora db$sql = ’select CustomerName, CustomerID from customers’;$rs = $conn->CacheExecute(15,$sql);?>如上，每次查询数据的时候，会把相应的结果序列化后保存到文件中，以后同样的查询语句就可以不用直接查询数据库，而是从缓存文件中获得。再来看看Smarty提供的页面缓存功能：require(Smarty.class.php);$smarty = new Smarty;$smarty->caching = true;if(!$smarty->is_cached(‘index.tpl’)) {// No cache available, do variable assignments here.$contents = get_database_contents();$smarty->assign($contents);}$smarty->display(‘index.tpl’);?>