From: Warren Young
Date: December 15 2005 1:53pm
Subject: Re: Crashes and memory corruption
List-Archive: http://lists.mysql.com/plusplus/5281
Message-Id: <43A1755D.7060900@etr-usa.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit

Björn Persson wrote:
> 
> Here's a program that does just that – gets a Row and reuses the Result. Then 
> it tries to use the Row object, but the expected data isn't there.

I apologize for taking so long to get back to you on this.

If you look at the implementation for Row::at(), you will immediately 
see why this happens.  Basically, to construct the ColData object that 
you are requesting, it needs to ask the result object for the list of 
field types returned in the result set.  The Row object could maintain a 
copy of this, but that would be inefficient when dealing with large 
result sets.

For now, I've just documented this requirement in the reference manual. 
  If you can think of a clean way for at() to avoid the need to access 
the result object, I'll certainly entertain proposals or patches.