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From "Knut Anders Hatlen (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5629) Queries with guarded null Parameter fail
Date Fri, 24 Feb 2012 12:19:48 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215566#comment-13215566

Knut Anders Hatlen commented on DERBY-5629:

According to SQL:2003, part 2, section 8.7 <null predicate>, the null predicate takes
a <row value predicand>. As far as I can see, <row value predicand> doesn't allow
untyped NULL. (It has to be a <contextually typed row value expression> to allow that.)

So it looks like accepting "values null is null" would be an extension of the standard. The
portable way to write that query is "values cast(null as integer) is null" to explicitly state
the type of the null value. Or just "values true"... :)
> Queries with guarded null Parameter fail
> ----------------------------------------
>                 Key: DERBY-5629
>                 URL: https://issues.apache.org/jira/browse/DERBY-5629
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions:
>         Environment: java version "1.6.0_30"
> Java(TM) SE Runtime Environment (build 1.6.0_30-b12)
> Java HotSpot(TM) Client VM (build 20.5-b03, mixed mode, sharing)
>            Reporter: Bernard
>         Attachments: NullParameterHibernateDerbyMaven.zip
> Some test cases in the attached Maven project fail where a null parameter is passed in
or a null value is coded in the query.
> In the context of this issue, a recently closed issue appears to be relevant:
> "Add support for setObject(<arg>, null)"
> https://issues.apache.org/jira/browse/DERBY-1938
> Some test cases in the attached project are Hibernate JPQL cases where Hibernate takes
care of generating the SQL queries.
> I thought it was appropriate to make a few cases not only one so that the issue gets
a little more test coverage.
> I also assume that issue DERBY-1938 aims to fix what we can see in these cases.
> This has become a major issue because it causes failure of a minimalistic JPQL query
as shown at
> http://en.wikipedia.org/wiki/Java_Persistence_Query_Language#Examples
> that shows a JPQL query:
> SELECT a FROM Author a WHERE :lastName IS NULL OR LOWER(a.lastName) = :lastName

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