Re: Functions, savepoints, autocommit = I am confused ! - Mailing list pgsql-general

From David G. Johnston
Subject Re: Functions, savepoints, autocommit = I am confused !
Date
Msg-id CAKFQuwac+Pf-vfUgSR3ht=7=O1A4FnRaJnsnugSB9z3+FvYzNg@mail.gmail.com
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In response to Functions, savepoints, autocommit = I am confused !  (Tim Smith <randomdev4+postgres@gmail.com>)
Responses Re: Functions, savepoints, autocommit = I am confused !
Re: Functions, savepoints, autocommit = I am confused !
List pgsql-general
On Fri, Jun 26, 2015 at 9:38 AM, Tim Smith <randomdev4+postgres@gmail.com> wrote:
I have a function that validates a web session is still active, so my
code looks something like this :

BEGIN
perform app_security.cleanSessionTable(p_forcedTimeout,p_sessionTimeout);
SAVEPOINT sp_cleanedSessionTable;
select * into strict v_row from app_security.app_val_session_vw where
session_id=p_session_id and session_ip=p_client_ip and
session_user_agent=p_user_agent;
update app_security.app_sessions set session_lastactive=v_now where
session_id=p_session_id;
etc. etc.
END

However, when used in conjunction with the broader validateSession
function,  whatever cleanSessionTable does gets rolledback because
obviously the select/update statements don't work because cleanSession
table has deleted the expired session ?

As you can see, I've tried adding a savepoint, but this seems to have
no effect ?  The autorollback still re-instates the expired session.

You need to trap exceptions and in the handler block issue a

ROLLBACK TO SAVEPOINT


​otherwise the the ROLLBACK issued at pg-session end will simply rollback everything.

David J.​

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