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Home Backend Development PHP Tutorial 如何安全过滤用户提交的数据提交到数据库

如何安全过滤用户提交的数据提交到数据库

Jun 06, 2016 pm 08:49 PM
mysql php

sql注入总是无孔不入(ps:' or 1=1#),该如何安全的过滤好呢(我用的php和mysql_connect)?

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sql注入总是无孔不入(ps:' or 1=1#),该如何安全的过滤好呢(我用的php和mysql_connect)?

可以使用 mysql_real_escape_string() 对字符串进行转义,然后再放进 SQL。

$name = mysql_real_escape_string($_POST['name']);
mysql_query('SELECT * FROM `users` WHERE `name` = "'.$name.'"');

//改进版。防 SQL 注入,同时屏蔽 _ 和 % 字符
function escape($str) {
  $str = mysql_real_escape_string($str);
  $str = str_replace(['_', '%'], ['\\_', '\\%'], $str);
  return $str;
}

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这里有官方介绍:http://www.php.net/manual/zh/function.mysql-real-escape-string.php


个人建议还是使用一个WEB框架,常见的WEB框架都有完善的防注入机制。
例如:
简单、快速入门的:CodeIgniter
功能更全面的:Yii (这个官网有时会被墙)

<code>select * from users where name = @name
</code>
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参数化查询(Parameterized Query 或 Parameterized Statement)是访问数据库时,在需要填入数值或数据的地方,使用参数 (Parameter) 来给值。

在使用参数化查询的情况下,数据库服务器不会将参数的内容视为SQL指令的一部份来处理,而是在数据库完成SQL指令的编译后,才套用参数运行,因此就算参数中含有指令,也不会被数据库运行。Access、SQL Server、MySQL、SQLite等常用数据库都支持参数化查询。

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