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From Kristian Waagan <Kristian.Waa...@Sun.COM>
Subject Re: WHEN clause in CREATE TRIGGER
Date Wed, 24 Aug 2005 09:53:40 GMT
Added a JIRA issue for this: http://issues.apache.org/jira/browse/DERBY-534

Comments, especially on earlier work done, are welcome!


Kristian Waagan wrote:
> Hello,
> When trying to get an application to use Derby instead of another 
> database, I needed to "port" a trigger. This trigger definition uses the 
> WHEN clause, which is defined in the SQL standards of 1999 and 2003.
> I see that the Derby manuals do not mention the WHEN clause at all in 
> the sections describing the CREATE TRIGGER. It is briefly mentioned in 
> the description of the SYSTRIGGERS table ("used only if there is a WHEN 
> clause (not yet supported)"). When quickly looking at the source code of 
> the parser and some other classes, I saw that the WHEN clause is handled 
> some places, but it is disabled (NULL always passed as WHEN text).
> My questions:
>   * How much work is done on support for the WHEN clause in CREATE TRIGGER?
>   * Do we want to support it? (it is defined in the SQL standards)
>   * A little on the side: Why is there a MODE DB2SQL in the FOR EACH 
> ROW/STATEMENT clause? Are there other modes as well? Do we plan to 
> support other modes?
> If feedback on this mail confirms that this should be on our TODO list, 
> I will add an issue to JIRA (but I do not plan to work on this at the 
> moment). If I have overlooked an existing JIRA issue for this, please 
> forgive me!

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