实例代码如下：
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<?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 {
$StartMicro = substr($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");
$result = array();
while($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);
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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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