我正在尝试理解OOP并创建自己的类来对MySQL数据库进行基准测试
class Benchmark
{
protected $sql, $db;
public $result, $time;
public function __construct($host, $user, $pass, $db, $result = array(), $time = null)
{
/* Vars */
$this->db = $db;
$this->result = $result;
$this->time = $time;
/*Start Timer */
$this->time = microtime(true);
/* Connect to DB */
$this->sql = new \mysqli($host, $user, $pass);
/* Measure Time and put result to array */
$this->result['benchmark']['connect'] = $this->elapsedTime($this->time);
}
public function testMySQL()
{
/* Connect to DB */
$this->sql->select_db($this->db);
$this->result['benchmark']['selectDb'] = $this->elapsedTime($this->time);
/* Fetch Version */
$version = $this->sql->server_version;
$this->result['benchmark']['version'] = $this->elapsedTime($this->time);
$this->result['info']['version'] = $version;
/* Benchmark */
$this->sql->query('SELECT BENCHMARK(1000000,ENCODE("hello",RAND()));');
$this->result['benchmark']['result'] = $this->elapsedTime($this->time);
/* Close Connection */
$this->sql->close();
/* Total Time */
$this->result['info']['total'] = $this->elapsedTime($this->time);
$this->dump($this->result);
}
}
然而,结果如下:
Array
(
[benchmark] => Array
(
[connect] => 0.001
[selectDb] => 0.001
[version] => 0.001
[result] => 10.181
)
[info] => Array
(
[version] => 50713
[total] => 10.181
)
)
为什么时间不加起来?在这种情况下,[total]
不应该是10.184
吗?
最初的想法是从这里开始的:https://github.com/odan/benchmark-php并且有效。如果我在该脚本上使用相同的数据,它会加起来,我错在哪里?我想这与我缺乏OOP有关...
修改
public function elapsedTime($time)
{
return number_format(microtime(true) - $time, 3);
}
答案 0 :(得分:0)
如果您正在测量自计时器启动以来经过的时间,那么每个输出只是该时间段内的一个点。从初始化计时器到获得结果所花费的时间除了连接,选择数据库和获取版本所需的时间,这些只是沿途的检查点(似乎几乎同时发生,至少在此计时器的分辨率下)。因此,执行前三个操作所花费的总时间 10.181
,.001
,而不是.003
。