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From "Gianny Damour (JIRA)" <...@geronimo.apache.org>
Subject [jira] Assigned: (GERONIMO-1545) CMP update statements will cause incorrect trigger firing in a database
Date Tue, 31 Jan 2006 13:31:34 GMT
     [ http://issues.apache.org/jira/browse/GERONIMO-1545?page=all ]

Gianny Damour reassigned GERONIMO-1545:
---------------------------------------

    Assign To: Gianny Damour

> CMP update statements will cause incorrect trigger firing in a database
> -----------------------------------------------------------------------
>
>          Key: GERONIMO-1545
>          URL: http://issues.apache.org/jira/browse/GERONIMO-1545
>      Project: Geronimo
>         Type: Bug
>     Versions: 1.0
>     Reporter: Daniel John Debrunner
>     Assignee: Gianny Damour
>     Priority: Critical

>
> Regargless of the number of columns modified the UPDATE statement issued to the database
logically updates all columns, though setting unmodified columns to the same value using the
CASE statement. E.g.
> UPDATE konto SET erzeugt = CASE WHEN ? THEN ? ELSE erzeugt END, bankname = CASE WHEN
? THEN ? ELSE bankname END, bankleitzahl = CASE WHEN ? THEN ? ELSE bankleitzahl END, kontonummer
= CASE WHEN ? THEN ? ELSE kontonummer END, kontostand = CASE WHEN ? THEN ? ELSE kontostand
END, fk_person = CASE WHEN ? THEN ? ELSE fk_person END WHERE guid = ?
> This will cause any update triggers to be fired, even those on the un-modified columns.
This, I think, is not the expected behaviour when an application only modifies, for example,
a customer's balance, but the CMP UPDATE will also fire the send-email on address change trigger.
> This form of UPDATE can also be very inefficient on some databases.

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