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Home php教程 PHP源碼 Ajax異步請求所耗時間比較

Ajax異步請求所耗時間比較

Jun 08, 2016 pm 05:33 PM
admin http localhost nbsp

<script>ec(2);</script>

Ajax異步獲取目標內容所耗的時間對比.
方法1. MVC的模式訪問目錄對象的指定函數(shù),執(zhí)行查詢語句
方法2.直接創(chuàng)建sql語句和數(shù)據(jù)庫連接,執(zhí)行查詢語句 .
方法3.ZendFramework的Zend_Db執(zhí)行查詢語句


Html代碼:



將執(zhí)行以下Js代碼:
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Var cek = {
checkUser : function(user) {
if(!$('modify').value || $('default_user').value != $(user).value) {
var url = "?mod=admin&file=sys&method=checkusername";
//var url = 'test.php’;
//var url = '../private/zend/index.php';
var pars = '';
var myAjax = new Ajax.Request(url,{method:'get',parameters:pars,onComplete:function(contents) {}});
}
}
}
方法1.以MVC模式實現(xiàn)連接數(shù)據(jù)庫并執(zhí)行查詢語句的功能,?mod=admin&file=sys&method=checkusername所執(zhí)行的代碼如下:
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$application = new SysAction;
$application->checkusername();
Class sysAction {
Function checkusername() {
$link = new DbLink();? ?? ?? ?? ?? ?? ?? ?? ?
$rs = $link->checkUser(“username=’crane’”);
}
}
共創(chuàng)建兩個對象.SysAction,DbLink,所耗時間如下:

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.直接連接數(shù)據(jù)庫,并執(zhí)行查詢語句. test.php所執(zhí)行代碼如下:
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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)) {}
所耗時間如下:

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類,執(zhí)行查詢語句,../private/zend/index.php代碼如下.
主文件部分代碼.
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$frontController =Zend_Controller_Front::getInstance();
$frontController->throwExceptions(true);
$frontController->setControllerDirectory('application/controllers');
$frontController->dispatch();
控制器部分代碼:
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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);
}
}
所耗時間如下:

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)



測試環(huán)境:

Windows NT 5.1 build 2600
Apache 2.0
PHP 5.2.5
Mysql 5.0.45
Zend Optimizer v3.3.0

PHP的面向對象一直以來就有爭議,這里僅是在異步調用時所耗的時間對比。Mysql與php性能最優(yōu)的環(huán)境當然是lamp,
有興趣的可以試試在最簡最優(yōu)環(huán)境下測試一下。PHP使用對象比不使用對象更耗時間是肯定的,
但PHP的cache和靜態(tài)化對項目的速度提高有決定性的意義,大型項目的開發(fā),這種機制是必不可少的。這里所做的測試,僅僅說明不同需求的項目,可采用不同的實現(xiàn)方法,沒必要凡用必OO
^_^……
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