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 = 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");
$result = array();
http://www.manongjc.com/article/1194.html
while($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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