Catching Exceptions in XPL

Hello,
   Is it possible within an XPL pipeline to catch an exception and change
the processing flow.

For example:

I'm executing an SQL query (with oxf:sql processor) that inserts or
updates a table. I want to be able to catch constraint violation
exceptions throw by the database interface, and redirect processing
flow through another XPL processor - this needs to be done within an
XPL pipeline, not just in a generic catch-all exception handling
pipeline.

Can anyone help?

I've heard 'oxf:exception-catcher' mentioned in the list, but cannot
find it documented anywhere.

Cheers
--
Mark Gibson <gibsonm |AT| cromwell |DOT| co |DOT| uk>
Web Developer & Database Admin
Cromwell Tools Ltd.
Leicester, England.

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Mark,
        I don't think the exception-catcher has any documentation at the
moment, but place it after you run your SQL processor, if there is an
exception it will output XML details of the exception, otherwise it will
give it input. You could then use p:choose to see if an exists

<p:processor name="oxf:exception-catcher">
        <p:input name="data" href="#sql-output"/>
        <p:output name="data" id="#exception-check"/>
</p:processor>

Hope this helps

Ryan Puddephatt
Software Engineer
TFX Group - IT UK
1 Michaelson Square
Livingston
West Lothian
Scotand
EH54 7DP
 
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Mark,

The oxf:exception-catcher processor is not documented because it is
quite an ugly hack, and that conceptually we would much prefer exception
handling in OPS, which would of course be more flexible.

-Erik

Mark Gibson wrote:


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