Ajax异步请求所耗时间比较
Ajax异步获取目标内容所耗的时间对比.
方法1. MVC的模式访问目录对象的指定函数,执行查询语句
方法2.直接创建sql语句和数据库连接,执行查询语句 .
方法3.ZendFramework的Zend_Db执行查询语句
Html代码:
将执行以下Js代码:
复制内容到剪贴板
Var cek = {
checkUser : function(user) {
if(!$('modify').value || $('default_user').value != $(user).value) {
var url = "?mod=admin&file=sys&method=checkusername";
//var url = 'test.php’;
//var url = '../private/zend/index.php';
var pars = '';
var myAjax = new Ajax.Request(url,{method:'get',parameters:pars,onComplete:function(contents) {}});
}
}
}
方法1.以MVC模式实现连接数据库并执行查询语句的功能,?mod=admin&file=sys&method=checkusername所执行的代码如下:
复制内容到剪贴板
$application = new SysAction;
$application->checkusername();
Class sysAction {
Function checkusername() {
$link = new DbLink();
$rs = $link->checkUser(“username=’crane’”);
}
}
共创建两个对象.SysAction,DbLink,所耗时间如下:
GET http://localhost/admin/?mod=admin&file=sys&method=checkusername(63ms)
GET http://localhost/admin/?mod=admin&file=sys&method=checkusername(62ms)
GET http://localhost/admin/?mod=admin&file=sys&method=checkusername(62ms)
GET http://localhost/admin/?mod=admin&file=sys&method=checkusername(62ms)
GET http://localhost/admin/?mod=admin&file=sys&method=checkusername(62ms)
GET http://localhost/admin/?mod=admin&file=sys&method=checkusername(63ms)
方法2.直接连接数据库,并执行查询语句. test.php所执行代码如下:
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$db = mysql_connect('localhost','root','123456');
mysql_select_db('test');
$sql = "select * from table where username='crane'";
$result = mysql_query($sql,$db);
while($row = mysql_fetch_array($result)) {}
所耗时间如下:
GET http://localhost/admin/test.php(15ms)
GET http://localhost/admin/test.php(15ms)
GET http://localhost/admin/test.php(15ms)
GET http://localhost/admin/test.php(15ms)
GET http://localhost/admin/test.php(15ms)
GET http://localhost/admin/test.php(15ms)
方法3.ZendFramework框架中Zend_Db类,执行查询语句,../private/zend/index.php代码如下.
主文件部分代码.
复制内容到剪贴板
$frontController =Zend_Controller_Front::getInstance();
$frontController->throwExceptions(true);
$frontController->setControllerDirectory('application/controllers');
$frontController->dispatch();
控制器部分代码:
复制内容到剪贴板
require_once 'Zend/Db.php';
class IndexController extendsZend_Controller_Action {
function init() {
}
functionindexAction() {
$params= array(
"host"=> 'localhost',
"username"=> 'root',
"password"=> '123456',
'dbname' => 'test'
);
//$user= 'crane';
$db= Zend_Db::factory('PDO_MYSQL',$params);
$select= $db->select();
$select->from('table','username')
->where($db->quoteInto('username=?','crane'))
;
$sql= $select->__toString();
$result= $db->fetchAll($sql);
}
}
所耗时间如下:
GET http://localhost/private/zend/index.php(125ms)
GET http://localhost/private/zend/index.php(141ms)
GET http://localhost/private/zend/index.php(110ms)
GET http://localhost/private/zend/index.php(141ms)
GET http://localhost/private/zend/index.php(109ms)
GET http://localhost/private/zend/index.php(141ms)
测试环境:
Windows NT 5.1 build 2600
Apache 2.0
PHP 5.2.5
Mysql 5.0.45
Zend Optimizer v3.3.0
PHP的面向对象一直以来就有争议,这里仅是在异步调用时所耗的时间对比。Mysql与php性能最优的环境当然是lamp,
有兴趣的可以试试在最简最优环境下测试一下。PHP使用对象比不使用对象更耗时间是肯定的,
但PHP的cache和静态化对项目的速度提高有决定性的意义,大型项目的开发,这种机制是必不可少的。这里所做的测试,仅仅说明不同需求的项目,可采用不同的实现方法,没必要凡用必OO
^_^……

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