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https://issues.apache.org/jira/browse/DERBY-6783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14565214#comment-14565214
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Bryan Pendleton commented on DERBY-6783:
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Here's a workaround: If the trigger definition is changed to:
CREATE TRIGGER tr1 AFTER UPDATE OF status ON t1
REFERENCING NEW AS newrow FOR EACH ROW
WHEN (newrow.id > 0 and newrow.status='d')
UPDATE t1 SET done_date=current_date WHERE id=newrow.id;
then everything works fine.
The reason this workaround works is that it causes the set of columns
in the trigger's WHEN clause (id, status) to be the same as the set
of columns in the trigger's REFERENCING clause (id, status).
> WHEN clause in CREATE TRIGGER for UPDATE is not working for the sql script
> below
> --------------------------------------------------------------------------------
>
> Key: DERBY-6783
> URL: https://issues.apache.org/jira/browse/DERBY-6783
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.11.1.1
> Reporter: Mamta A. Satoor
> Assignee: Abhinav Gupta
> Attachments: diagnostics.diff, testTriggerWhenClause.diff
>
>
> Following sql script was shared on
> derby-user(http://mail-archives.apache.org/mod_mbox/db-derby-user/201412.mbox/%[email protected]%3e).
> The UPDATE TRIGGER with the WHEN clause below does not fire as expected.
> Same script works fine on DB2.
> ij version 10.11
> ij> connect 'jdbc:derby:MyDbTest;create=true';
> ij> CREATE TABLE t1 (id INTEGER, done_date DATE, status CHAR(1));
> 0 rows inserted/updated/deleted
> ij> CREATE TRIGGER tr1 AFTER UPDATE OF status ON t1 REFERENCING NEW AS
> newrow FOR EACH ROW WHEN (newrow.status='d') UPDATE t1 SET
> done_date=current_date WHERE id=newrow.id;
> 0 rows inserted/updated/deleted
> ij> insert into t1 values (1, null, 'a');
> 1 row inserted/updated/deleted
> ij> SELECT * FROM t1;
> ID |DONE_DATE |STA&
> ---------------------------
> 1 |NULL |a
>
> 1 row selected
> ij> UPDATE t1 SET status='d';
> 1 row inserted/updated/deleted
> ij> SELECT * FROM t1;
> ID |DONE_DATE |STA&
> ---------------------------
> 1 |NULL |d
>
> 1 row selected
> ij> exit;
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