<a-wild-guess>
if you separate them as 3 separate ZSQL methods (or class attributes if
you're using zsql via a python product) and try again, do you get the
same unatomic behaviour?
</a-wild-guess>
I'm always using Postgresql databases and I've been using PoPy for the
DA but now I'm always using ZPsycopgDA. Atomicity has never been a problem.
I'm not familiar with the eGenix mxODBC DA but perhaps you should
contact it's author as well as the list.
Best of luck
Maslak, Michael wrote:
For some reason I thought ZSQL method calls were atomic, but they appear
otherwise.
Using an eGenix mxODBC Database Connection at
/Database/PoPy_database_connection to a SQL Server 2000 back end, I have
created a Python script to write SQL commands and feed them in one large
string:
UPDATE equip SET workstation=1 WHERE eq_id=39315;
UPDATE node SET node='M28057' WHERE node_id=13451;
UPDATE materiel SET mat_nm='mm-M28057-H-01', owner='mmaslak',
datetime='2006/04/24 15:09:07.611 GMT-5' WHERE mat_id=39315;
This all gets sent as one string to a ZSQL method where the first two
commands execute, but the third fails because it doesn't like the
datetime string, which indeed fails when I try it alone in the PoPy
connection. Why, oh why doesn't the whole thing fail like I might expect?
When I wrap the call in a 'begin transaction … commit', it becomes
atomic. Nothing happens if part of it fails. Great.
But failure is not detectable by the Python script. I have used
try/except and if/else blocks to ascertain failure. It thinks a
non-commit is AOK, not an exception. Is this function of the eGenix
ODBC? Of MS SQL Server 2K? Zope/ZSQL/Python?
How can I detect failure and maintain atomicity?
Michael Maslak, Jr.
Associate Software Engineer
Anteon Corporation
294 Thames Ave
Bay St. Louis, MS 39520
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