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php+mysql prepare 与普通查询的性能对比
实例代码如下：
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66<?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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