php+mysql prepare 与普通查询的性能对比实例讲解

php+mysql prepare 与普通查询的性能对比 实例代码如下： php class timer { public $StartTime = 0; public $StopTime = 0; public $TimeSpent = 0; function start(){ $this-StartTime = microtime(); } function stop(){ $this-StopTime

php+mysql prepare 与普通查询的性能对比

实例代码如下：

<?php
class timer {
public $StartTime = 0;
public $StopTime = 0;
public $TimeSpent = 0;

function start(){
$this->StartTime = microtime();
}

function stop(){
$this->StopTime = microtime();
}

function spent() {
if ($this->TimeSpent) {
return $this->TimeSpent;

} else {
// http://www.manongjc.com
$StartMicro = substr($this->StartTime,0,10);
$StartSecond = substr($this->StartTime,11,10);
$StopMicro = substr($this->StopTime,0,10);
$StopSecond = substr($this->StopTime,11,10);
$start = floatval($StartMicro) + $StartSecond;
$stop = floatval($StopMicro) + $StopSecond;
$this->TimeSpent = $stop - $start;

return round($this->TimeSpent,8).'秒';
}
}

}

$timer = new timer;
$timer->start();

$mysql = new mysqli('localhost','root','root','ganbaobao_ucenter');

/*
$query = $mysql->query("select username,email from uc_members where uid < 100000");
$result = array();
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while($result = $query->fetch_array())
{
$result[] = array('name'=>$result['username'],'email'=>$result['email']);
}
*/
$query_prepare = $mysql->prepare("select username,email from uc_members where uid < ?");

$id = 100000;
$query_prepare->bind_param("i",$id);

$query_prepare->execute();
$query_prepare->bind_result($username,$email);

$result = array();
while($query_prepare->fetch())
{
$result[] = array('name'=>$username,'email'=>$email);
}

$timer->stop();
echo '</br>预查询mysql运行100000条数据时间为: '.$timer->spent();
unset($timer);
//var_dump($result);

运行结果：

普通mysql运行1000条数据时间为: 0.011621秒

普通mysql运行10000条数据时间为: 0.07766891秒

普通mysql运行100000条数据时间为: 0.10834217秒

预查询mysql运行1000条数据时间为: 0.00963211秒

预查询mysql运行10000条数据时间为: 0.04614592秒

预查询mysql运行100000条数据时间为: 0.05989885秒

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