From: Warren Young
Date: December 12 2008 2:05am
Subject: Re: Nested transaction should throw exception?
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On Dec 11, 2008, at 4:54 AM, Joel Fielder wrote:

> Personally, I'd like to know if my code is attempting a nested  
> transaction, and ideally by means of an exception.

It's already on the Wishlist.  It'll have to wait for v4.0 because it  
means adding a flag to Connection or DBDriver, which changes the  
object size, thus breaking the ABI.