在java中避免SQL注入 [英] Avoiding SQL injection in java

问题描述

我是JavaEE的新手，并试图通过检查数据库来学习创建一个简单的登录页面。以下是代码示例：

I am new to JavaEE and trying to learn to make a simple login page by checking the database. Here is the code sample:

    ResultSet result=null;
        Statement s = (Statement) con.createStatement();
    result=s.executeQuery("select username from Table where ID="+id and " password="+password);

它应该容易受到SQL注入吗？我将通过在ASP.NET中使用参数化查询来执行此操作，如下所示：

It should be vulnerable to SQL injection right? I would do this by using parametrized query in ASP.NET like the following:

SqlConnection con = new SqlConnection();
SqlCommand cmd=new SqlCommand("select username from Table where ID=@id and password=@password",con);    
cmd.Parameters.AddWithValue("@id", id); 
cmd.Parameters.AddWithValue("@password", password);  

有没有办法在java中使用参数化查询？任何人都可以使用参数化形式的查询来避免SQL注入吗？

Is there any way to use parametrized queries in java like this? Can anyone use that query in parametrized form to avoid SQL injection?

谢谢

推荐答案

是的，您可以使用 PreparedStatement ;例如：

Yes you can do this with PreparedStatement; for example:

PreparedStatement preparedStatement = con.PreparedStatement(
        "SELECT * FROM MY_TABLE WHERE condition1 = ? AND condition2 = ?");
preparedStatement.setString(1,condition1_value);
preparedStatement.setString(2,condition2_value);
ResultSet rs = preparedStatement.executeQuery();

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