ADO Transaction via MyODBC

[Stefano Griggio]

Hi.
I'm writing a VisualC++ persistent connection application using ADO.
When saving to MySQL I Use transaction as follow :

try
{
pConnection->BeginTrans();

// Some operation

pConnection->CommitTrans();
}
catch(_com_error &e)
{
// error handling
}

If a net error (i.e. server done) occurs in the try block without performing the CommitTrans(),
the transaction seems to be pending.(if I execute again the code, the begintrans()
generate an exception).
How can I abort a pending transaction in ADO?
Must I close the connection?

Thanks, Stefano.