添加特殊字符时出现问题“ ''。 [英] Problem coming when adding a special character " ' ".

问题描述

我创建了一些文本框来接收。我用于某些报告标题的数据。但是当我试图用那个特殊字符输入面包师的单词时，我遇到了问题。我怎么能克服这个。



我尝试过：



我用谷歌搜索但无法找到合适的解决方案。

I created some text boxes to take in put.That data I am using for some reports heading. But I am getting problem when I am trying to enter baker's like word with that special character. How can I overcome with that.

What I have tried:

I googled but unable to find suitable solution.

推荐答案

简单：永远不要连接字符串来构建SQL命令。它让您对意外或故意的SQL注入攻击持开放态度，这可能会破坏您的整个数据库。改为使用参数化查询。



连接字符串时会导致问题，因为SQL会收到如下命令：

Simple: Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.

When you concatenate strings, you cause problems because SQL receives commands like:

SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'

就SQL而言，用户添加的引号会终止字符串，并且您会遇到问题。但情况可能更糟。如果我来并输入它：x'; DROP TABLE MyTable; - 然后SQL收到一个非常不同的命令：

The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. IF I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:

SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;--'

哪个SQL看作三个单独的命令：

Which SQL sees as three separate commands:

SELECT * FROM MyTable WHERE StreetAddress = 'x';

完全有效的SELECT

A perfectly valid SELECT

DROP TABLE MyTable;

完全有效的删除表格逗号nd

A perfectly valid"delete the table" command

--'

其他一切都是评论。

所以它确实：选择任何匹配的行，从数据库中删除表，并忽略其他任何内容。



所以总是使用参数化查询！或者准备好经常从备份中恢复数据库。你定期进行备份，不是吗？

And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.

So ALWAYS use parameterised queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don;t you?

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