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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6387) Incorrect ordering of triggers in dblook
Date Fri, 28 Feb 2014 16:42:20 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6387?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13915962#comment-13915962

ASF subversion and git services commented on DERBY-6387:

Commit 1572994 from mikem@apache.org in branch 'code/branches/10.10'
[ https://svn.apache.org/r1572994 ]

DERBY-6387: Incorrect ordering of triggers in dblook

backported change #1551940.  backport required some manual merge as the
key query had changed in multiple ways on the trunk.  Fix was to just add
the "order by" by hand to the existing 10.10 query.

Order the triggers by the CREATIONTIMESTAMP column so that dblook
produces a script that recreates the triggers in the same order as
they were originally created.

> 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: Mike Matrigali
>             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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