php读写文件与读写数据库的效率比较分享
欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入 一直以来大家都把一些不经常修改的数据保存为文件来调用,看来还是比较正确的,直接读文件相比数据库查询效率更胜一筹,而且文中还没算上连接和断开的时间 这个问题也是最近才想到的,就是到底读文件
欢迎进入Linux社区论坛,与200万技术人员互动交流 >>进入
一直以来大家都把一些不经常修改的数据保存为文件来调用,看来还是比较正确的,直接读文件相比数据库查询效率更胜一筹,而且文中还没算上连接和断开的时间
这个问题也是最近才想到的,就是到底读文件更快还是读数据库更快,能快多少,天缘也搜索过,没见有网友就这个问题答复过,也可能是太简单的缘故,我们本文还是来实测一下,由于时间关系,VC还没装,天缘先用PHP测试了一下,下次有时间在C/C++上补充测试到本文来,因为PHP的底层解析应该也是基于C的,所以估计两者环境测试结果差不多,小问题大收获,现在就来看一下测试过程及结果。
测试程序如下:
说明1:由于读数据库语句调用简单的封包函数两次,所以把读文件也改成连续调用两次,数据库记录ID为1就在第一条,并且唯一索引。
说明2:测试两次一次是4K数据,一次是整形数据
set_time_limit(0);
function fnGet($filename)
{
$content = file_get_contents($filename);
return $content;
}
function fnGetContent($filename)
{
$content = fnGet($filename);
return $content;
}
$times=100000;
echo '数据库查询结果:
';
//---------------------------------
$begin=fnGetMicroTime();
for($i=0;$i
{
$res=$dbcon->mydb_query("SELECT log_Content FROM blog WHERE log_ID='1'");
$row=$dbcon->mydb_fetch_row($res);
$content=$row[0];
}
echo 'fetch_row '.$times.' 次时间:'.(fnGetMicroTime()-$begin)。'秒
';
//---------------------------------
$begin=fnGetMicroTime();
for($i=0;$i
{
$res=$dbcon->mydb_query("SELECT log_Content FROM blog WHERE log_ID='1'");
$row=$dbcon->mydb_fetch_array($res);
$content=$row['log_Content'];
}
echo 'fetch_array '.$times.' 次时间:'.(fnGetMicroTime()-$begin)。'秒
';
//---------------------------------
$begin=fnGetMicroTime();
for($i=0;$i
{
$res=$dbcon->mydb_query("SELECT log_Content FROM blog WHERE log_ID='1'");
$row=$dbcon->mydb_fetch_object($res);
$content=$row->log_Content;
}
echo 'fetch_object '.$times.' 次时间:'.(fnGetMicroTime()-$begin)。'秒
';
//---------------------------------
$dbcon->mydb_free_results();
$dbcon->mydb_disconnect();
fnWriteCache('test.txt',$content);
echo '直接读文件测试结果:
';
//---------------------------------
$begin=fnGetMicroTime();
for($i=0;$i
{
$content = fnGetContent('test.txt');
}
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