> The handler is not embedded in the loop that it handles: it follows directly after
What I originally posted is exactly what our code looks like. The WHEN handler is the last statement INSIDE the loop. If an insert statement throws an exception, we see the loop continue and the exception logged. The issue is that it appears that sometimes the insert succeeds and the update fails and the loop continues. -----Original Message----- From: firebird-support@yahoogroups.com [mailto:firebird-support@yahoogroups.com] On Behalf Of Helen Borrie Sent: Friday, August 10, 2012 4:25 PM To: firebird-support@yahoogroups.com Subject: RE: [firebird-support] Transactions & exception trapping At 05:00 AM 11/08/2012, Rick Debay wrote: >FOR ... BEGIN > INSERT_PROCEDURE RETURNING VALUE > UPDATE TABLE WITH VALUE > WHEN ... BEGIN > LOG > END >END > >If the insert procedure directly or indirectly causes an exception the >insert will be abandoned, the update will be skipped, and all data from >previous or subsequent non-erroneous loop iterations will be preserved. > >Now if the update fails, would the inserted data within the same loop >iteration be preserved? I've been assuming that everything within the >BEGIN...END was abandoned. The handler is not embedded in the loop that it handles: it follows directly after. The flow should be: FOR ... do BEGIN INSERT_PROCEDURE RETURNING VALUE UPDATE TABLE WITH VALUE end WHEN ... do BEGIN LOG END If an exception occurs anywhere in an iteration of that loop, everything within that iteration is abandoned, control drops into the WHEN block and executes that before returning to the top of the loop. If a handler block is not found directly after the looping block, control moves out through the layers until one is found that fits the exception. Everything enclosed by the block whose handler is found is abandoned. Ultimately, if no explicit handler is found in the enclosing layers that fits the exception, control drops to the EXIT statement and the entire work of the procedure is abandoned. ./heLen ------------------------------------ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Visit http://www.firebirdsql.org and click the Resources item on the main (top) menu. Try Knowledgebase and FAQ links ! Also search the knowledgebases at http://www.ibphoenix.com ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Yahoo! Groups Links
