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

                        <p>php+mysql prepare 与普通查询的性能对比</p>

实例代码如下：

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); }

$timer->stop();
echo '
预查询mysql运行100000条数据时间为: '.$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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