[Zope] Determining Success or Failure status on SQL update in ZSQL Metho d d

[Ira Hochman]

Hello,

A search of prior discussion threads shows this question occasionally
appears without resolution.  Perhaps someone has found an answer to it since
then, so here it is...

Using a ZSQL method, how do I detect if any rows have been affected when
performing a SQL UPDATE.  I do not need to know how many rows, just whether
the statement affected 0 rows or more than 0 rows.

My environment is Oracle (7 & 8) and with other programmatic interfaces to
Oracle, one can capture a (non-error) return status that indicates if no
rows were affected.  This is supported in the ODBC API for Oracle and other
databases as well.  Is there a way to capture this return status even though
it is not flagged as an error?  

No dtml-try since it's only a return code, not an error code

As a workaround I've tried to do a select count, but to do this I need to
 1) execute the select and update in the same transaction and
 2) run the select before the update, store the value, then return it at the
end (the update may or will change at least one of the fields referenced in
the where clause, so I cannot run it after)

So, inside of a SQL method, I can do #1, but cannot see a way to do #2.

Is there a secret trick to this or is it a case of adding code to the
existing DAs?  Please please tell me it's the former.

Thanks in advance,
Ira