Re: strange use of %s

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Date	Tue, 19 Apr 2011 15:31:44 +1000
Subject	Re: strange use of %s
From	Chris Angelico <rosuav@gmail.com>
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On Tue, Apr 19, 2011 at 3:22 PM, Dennis Lee Bieber
<wlfraed@ix.netcom.com> wrote:
> On Mon, 18 Apr 2011 09:44:40 +0100, Tim Golden <mail@timgolden.me.uk>
> declaimed the following in gmane.comp.python.general:
>
>
>>    sql = "SELECT ... WHERE name LIKE '%' + ? + '%'"
>>    q = db.cursor ()
>>    q.execute (sql, [response])
>>
>        That won't work properly either (at least not in MySQLdb -- which
> quotes the values put into the placeholder; you'd end up with
>        '%''value''%'

You'd end up with "... LIKE '%' + 'value' + '%'" which is perhaps
overkill (it forces the database engine to concatenate three strings),
but at least it's safe.

Chris Angelico

Thread

strange use of %s Tracubik <affdfsdfdsfsd@b.com> - 2011-04-18 08:29 +0000
  Re: strange use of %s Tim Golden <mail@timgolden.me.uk> - 2011-04-18 09:44 +0100
    Re: strange use of %s John Nagle <nagle@animats.com> - 2011-04-25 15:01 -0700
      Re: strange use of %s Chris Angelico <rosuav@gmail.com> - 2011-04-26 08:10 +1000
  Re: strange use of %s Chris Angelico <rosuav@gmail.com> - 2011-04-18 18:50 +1000
  Re: strange use of %s Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-04-18 22:22 -0700
  Re: strange use of %s Chris Angelico <rosuav@gmail.com> - 2011-04-19 15:31 +1000
  Re: strange use of %s Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-04-19 21:01 -0700

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