我如何在mysql / C＃中解决这个问题 [英] How do I fix this in mysql/C#

问题描述

它不起作用请帮帮我。



我只想更新与标签2相同的文字。

It doesn't work please help me.

I only want to update the Text which is the Same as label 2.

  string constring = "datasource= xyz.xyz.xyz;port=3306;username=xyz;password=xyz";

string query = "update mysqlcshap.Fahrzeug WHERE Fahrzeug= "+label2.Text+"  set Status='1' ;";



            MySqlConnection Dateneingabe = new MySqlConnection(constring);
            MySqlCommand cmd = new MySqlCommand(query, Dateneingabe);
            MySqlDataReader myReader;


            try
            {
                Dateneingabe.Open();
                myReader = cmd.ExecuteReader();

                while (myReader.Read()) { }





            }




            catch (Exception ex)
            { }

我尝试了什么：



谷歌，Youtube，我需要你的帮助...... ..

What I have tried:

Google, Youtube, I Need your help …..

推荐答案

Quote：

它不起作用

描述如何不起作用。错误信息？

我们无法运行您的代码，因为我们无法访问您的数据库。

Describe how is doesn't work. Error message ?
We can't run your code as we don't have access to your database.

string query = "update mysqlcshap.Fahrzeug WHERE Fahrzeug= "+label2.Text+"  set Status='1' ;";

不是你问题的解决方案，而是你遇到的另一个问题。

永远不要通过连接字符串来构建SQL查询。迟早，您将使用用户输入来执行此操作，这会打开一个名为SQL注入的漏洞，这对您的数据库很容易并且容易出错。

名称中的单引号你的程序崩溃。如果用户输入像Brian O'Conner这样的名称可能会使您的应用程序崩溃，那么这是一个SQL注入漏洞，崩溃是最少的问题，恶意用户输入，并且它被提升为具有所有凭据的SQL命令。

SQL注入 - 维基百科 [ ^ ]

SQL注入 [ ^ ]

按示例进行SQL注入攻击 [ ^ ]

PHP：SQL注入 - 手册 [ ^ ]

SQL注入预防备忘单 - OWASP [ ^ ]

我该怎么办？解释没有技术术语的SQL注入？ - 信息安全堆栈交换 [ ^ ]

Not a solution to your question, but another problem you have.
Never build an SQL query by concatenating strings. Sooner or later, you will do it with user inputs, and this opens door to a vulnerability named "SQL injection", it is dangerous for your database and error prone.
A single quote in a name and your program crash. If a user input a name like "Brian O'Conner" can crash your app, it is an SQL injection vulnerability, and the crash is the least of the problems, a malicious user input and it is promoted to SQL commands with all credentials.
SQL injection - Wikipedia[^]
SQL Injection[^]
SQL Injection Attacks by Example[^]
PHP: SQL Injection - Manual[^]
SQL Injection Prevention Cheat Sheet - OWASP[^]
How can I explain SQL injection without technical jargon? - Information Security Stack Exchange[^]

string query = "update mysqlcshap.Fahrzeug set Status='1' WHERE Fahrzeug= '"+label2.Text+"'  ;";

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