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HomeBackend DevelopmentPHP TutorialEcshop、Discuz! 等开源产品的局限,ecshopdiscuz_PHP教程

Ecshop、Discuz! 等开源产品的局限,ecshopdiscuz

记得今年年初,我初次接触Discuz!和Ecshop时,一阵阵地惊叹:成熟度这么高的产品,居然是免费的。我们这些搞传统软件开发的要怎么活?另外也奇怪,做这些产品的公司,他们要怎么活?

我公司的网站,原型正好是用Ecshop和Discuz!,到开发方移交给我们后,我们做二次开发,深入了解了其代码,早期的疑惑才有了答案。

可以说,这些产品,都无法支持真正严肃的应用环境。

1)所有的数据库访问都不用mysqli连接,因此无法用prepared statement,而全部用拼接方式。

这些系统,对数据库(主要都是mysql)的访问,全部采用sql拼接方式。举一个Ecshop的例子:

   <span>$w_openid</span> = <span>$db</span> -> getOne("SELECT `wxid` FROM `wxch_user` WHERE `wxid` = '<span>$openid</span>'");

或类似

   <span>$wxch_user_sql</span> = "INSERT INTO `<span>$thistable</span>` ( `user_name`,`password`,`field3`,`field4`) VALUES ('$variable1','<span>$variable2</span>','value3','value4')"<span>;
   </span><span>$db</span> -> query(<span>$wxch_user_sql</span>);

 

这种语句,偶尔出现倒也可以理解,如果所有的地方都是这样(正如Ecshop),则应该出于对数据库只有入门水平的人手里。因为他完全没有使用prepared statement的概念。

所以,这种系统几个人用应该是快如闪电,并发量一大,后台数据库可能被搅成一锅粥了。

正确的连接数据库的方法应该是:

 <span>$mysqli</span> = <span>new</span> mysqli("server", "username", "password", "database_name");

而不是

$conn = mysql_connect('server','username','password') or die ("数据连接错误!!!");

 正确的sql语句应该是:

<span>$stmt</span> = <span>$mysqli</span>->prepare("INSERT INTO table (column) VALUES (?)"<span>);

</span><span>$stmt</span>->bind_param("s", <span>$safe_variable</span><span>);

</span><span>$stmt</span>->execute();

而不是前面那样。

 

2)系统安全性极差

因为不用prepared statement,只要编程人员不注意,sql injection可以说到处都有可能。但看看他们的代码,可以说压根不注意。因为这些系统,对用户输入几乎不用转义。

对于已经很烂的代码,正确的用法是应该有第二行:

<span>$unsafe_variable</span> = <span>$_POST</span>["user-input"<span>];
</span><span>$safe_variable</span> = <span>mysql_real_escape_string</span>(<span>$unsafe_variable</span><span>);

</span><span>mysql_query</span>("INSERT INTO table (column) VALUES ('" . <span>$safe_variable</span> . "')");

但在这些系统里,上面的第二行很少看到。

这样造成的问题就是,针对这些系统的机器人极多。基本上你的论坛上线不久很快就被机器人发的水贴、广告贴盯上了。

 

本人对这些系统研究还很肤浅,不过看到这两条,就已经明白,这种系统是供学习用的。开发这些产品的公司,他们的水平很高,不过高质量的代码应该是用在了商业性收费的产品上。大家别以为可以捡到便宜。

 

转载请注明出处:cnblogs上的海边的骆驼博客。原博文地址:http://www.cnblogs.com/yingjiang/p/4750408.html 

 

 

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