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From "Deepa Remesh (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-551) Allow invoking java stored procedures from inside a trigger. Make CALL a valid statement in the trigger body.
Date Mon, 10 Jul 2006 17:11:32 GMT
     [ http://issues.apache.org/jira/browse/DERBY-551?page=all ]

Deepa Remesh updated DERBY-551:
-------------------------------

    Attachment: derby-551-draft3.diff
                derby-551-draft3.status

Attaching a new draft patch "derby-551-draft3.diff" which uses Dan's first suggestion (use
the existing mechanism, which means a before trigger with a CALL procedure that is declared
MODIFIES SQL DATA statement would succeed but would fail at runtime when fired. )

In this patch, I removed the checks that I had added in the parser to check for type of procedure
allowed in a before trigger. Instead, the existing runtime check is used. This was slightly
modified to check that insert, update, delete on "any" table is not allowed in a before trigger.
The existing check was only looking for insert, update,delete on the "trigger table". If this
is acceptable as a first step, I plan to submit a patch for this. And then work on a follow-up
patch to move the check to compile time using Dan's second suggestion (use the existing compile
time mechansim that defines what is allowed in a context).  Please take a look at the new
patch. Thanks.

> Allow invoking java stored procedures from inside a trigger. Make CALL a valid statement
in the trigger body.
> -------------------------------------------------------------------------------------------------------------
>
>          Key: DERBY-551
>          URL: http://issues.apache.org/jira/browse/DERBY-551
>      Project: Derby
>         Type: New Feature

>   Components: SQL
>     Versions: 10.1.1.0
>  Environment: All platforms
>     Reporter: Satheesh Bandaram
>     Assignee: Deepa Remesh
>      Fix For: 10.2.0.0
>  Attachments: ProcedureInTrigger_Tests_v1.html, derby-551-draft1.diff, derby-551-draft1.status,
derby-551-draft2.status, derby-551-draft3.diff, derby-551-draft3.status, derby-551draft2.diff
>
> Derby currently doesn't allow CALL statement to be used in a trigger body. It would be
great to allow java stored procedure invocation inside a trigger. Since Derby doesn't have
SQL procedure language, triggers can only execute a single SQL statement. If we allow stored
procedures in triggers, it would be possible to write a trigger that involves more than just
one SQL statement. Functions are currently allowed, but they are read-only.
> I believe it is fairly easy to support this enhancement. Need good amount of testing
though.

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