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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6387) Incorrect ordering of triggers in dblook
Date Fri, 20 Dec 2013 11:30:11 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13853883#comment-13853883

Knut Anders Hatlen commented on DERBY-6387:

I'm guessing that the new test case in dblook_test suffers from the same instability as DERBY-5866
if the creation timestamps of two triggers happen to be equal. Hopefully, it will go away
once DERBY-5866 has been fixed.

> Incorrect ordering of triggers in dblook
> ----------------------------------------
>                 Key: DERBY-6387
>                 URL: https://issues.apache.org/jira/browse/DERBY-6387
>             Project: Derby
>          Issue Type: Bug
>          Components: Tools
>    Affects Versions:
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>             Fix For:
>         Attachments: create-triggers.sql, d6387-1a.diff
> The order in which triggers fire, is partly determined by the order in which they are
> See here:
> http://db.apache.org/derby/docs/10.10/ref/rrefsqlj43125.html
> |   When multiple triggers are defined for the same database event for
> |   the same table for the same trigger time (before or after), triggers
> |   are fired in the order in which they were created.
> And here:
> SQL:2003, part 2, section 4.38.1 General description of triggers:
> |   The order of execution of a set of triggers is ascending by value of
> |   their timestamp of creation in their descriptors, such that the
> |   oldest trigger executes first.
> Since the order of creation matters, dblook should generate CREATE TRIGGER statements
in an order that preserves the original order of execution.
> dblook currently generates CREATE TRIGGER statements in the order returned by a SELECT
query against SYS.SYSTRIGGERS. The SELECT query does not have an ORDER BY clause, so it is
not guaranteed to return the rows in a specific order.

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