php+mysql预查询prepare 与普通查询的性能对比-优快云博客

本文通过对比预查询（prepare）与普通查询的方式，展示了预查询如何有效降低数据库服务器的负载及提高处理大量数据时的效率。

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prepare可以解决大访问量的网站给数据库服务器所带来的负载和开销，本文章通过实例向大家介绍预查询prepare与普通查询的性能对比，需要的朋友可以参考一下。

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);