MySQLdb not allowing hyphen

Emeka emekamicro at gmail.com
Mon Feb 6 00:52:28 CET 2012


Dennis , Chris

Thanks so much!



On Mon, Feb 6, 2012 at 1:23 AM, Dennis Lee Bieber <wlfraed at ix.netcom.com>wrote:

> On Mon, 6 Feb 2012 00:41:24 +0200, Emeka <emekamicro at gmail.com> wrote:
>
> >Hello All,
> >
> >I noticed that MySQLdb not allowing hyphen may be way to prevent injection
> >attack.
>
>         What hyphen?
>
> >I have something like below:
> >
> >"insert into reviews(message, title)values('%s', '%s')" %( "We don't know
> >where to go","We can't wait till morrow" )
> >
>         <snip>
> >How do I work around this error?
>
>         Very simple... DON'T QUOTE PLACEHOLDERS AND USE MySQLdb
> parameterized queries.
>
> csr.execute("insert into reviews (message, title) values (%s, %s)",
>                (       "We don't know where to go",
>                        "We can't wait till <sic> morrow"       )       )
>
>        The whole purpose of parameterized queries is that the .execute()
> logic will SAFELY wrap the supplied values with quotes AND escape any
> problem characters within the value.
>
>        The reason you got an error was not a hyphen (there are no hyphens
> in your example) but rather that you closed the quote. Your generated
> SQL was:
>
> insert into reviews (message, title) values ('We don't know where to
> go', 'We can't wait till morrow')
>
> which means a string of:
>                "We don"
> SQL garbage
>                 t know where to go
> string
>                ", "
> SQL garbage
>                We can
> and another string
>                "t wait till morrow"
> --
>        Wulfraed                 Dennis Lee Bieber         AF6VN
>        wlfraed at ix.netcom.com    HTTP://wlfraed.home.netcom.com/
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>



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