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HomeBackend DevelopmentPHP TutorialPHP gets the number of database queries to generate a page_PHP tutorial

很多博客软件都有这么一个功能,比如“生成本次页面一共花费了xx毫秒,进行了xx次数据库查询”等等。那么这个功能是如何实现的呢,下面我大概说下思路。

1. 在类的构造函数中声明全局变量

定义一个全局变量 $queries 用来统计页面生成经过的数据库查询次数。

function __construct()
{
	parent::__construct();
	global $queries;
}

2. 修改数据库类中封装好的的 query()

你应该有用到数据库类吧,找到它封装 query() 的方法,比如下面的:

// 执行SQL语句
public function query($query)
{
	//echo $query.'<br />';
	++$GLOBALS['queries'];
	return $this->result = mysql_query($query, $this->link);
}

那么每执行一次 Query,全局变量 queries 就会自增1。

3. 在方法体中这样写:

public function content($id = 0)
{
	$GLOBALS['queries'] = 0;
	// something to do
	echo $GLOBALS['queries'];
}

就这么简单就能实现那个功能了。

4. 附带计算PHP脚本执行的函数

之前写的博文介绍了下计算PHP脚本执行时间的函数,这里再贴一下吧。

// 计时函数 
public function runtime($mode = 0) { 
	static $t; 
	if(!$mode) { 
		$t = microtime(); 
		return; 
	} 
	$t1 = microtime(); 
	//list($m0,$s0) = split(" ",$t);
	list($m0,$s0) = explode(" ",$t);
	//list($m1,$s1) = split(" ",$t1);
	list($m1,$s1) = explode(" ",$t1);
	return sprintf("%.3f ms",($s1+$m1-$s0-$m0)*1000); 
} 

使用如下:

public function content($id = 0)
{
	$this -> runtime();
	$GLOBALS['queries'] = 0;
	// something to do
	echo $GLOBALS['queries'];
	echo $this -> runtime(1);
}

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