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https://issues.apache.org/jira/browse/DERBY-5728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16971260#comment-16971260
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Bernard commented on DERBY-5728:
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Richard, Thanks for experimenting. Unfortunately, the suggested workaround is
not a solution. It uses a native query. The JPQL language specification does
not include casting. I have researched the subject sufficiently about seven
years ago, and nothing has changed since then. ORM is such a complex issue to
deal with on the application programming side. JPQL and other abstractions have
been invented for a reason, to make life easier for application programmers.
This bug is ugly in that context. It defeats the purpose of writing
cross-platform JPQL because it is not possible in this basic, general case.
> Add Support for NULL IS NULL
> ----------------------------
>
> Key: DERBY-5728
> URL: https://issues.apache.org/jira/browse/DERBY-5728
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.8.2.2
> Environment: Windows XP
> java version "1.6.0_31"
> Java(TM) SE Runtime Environment (build 1.6.0_31-b05)
> Java HotSpot(TM) Client VM (build 20.6-b01, mixed mode, sharing)
> Reporter: bernard
> Priority: Critical
> Labels: derby_triage10_10
> Attachments: Bug5728.java, NullParameterEclipseLinkDerbyMaven.zip,
> NullParameterHibernateDerbyMaven.zip
>
>
> The following query fails:
> SELECT ID FROM CUSTOMER WHERE ((NULL IS NULL) OR (NAME = NULL))
> Why this is an issue?
> At least two major Java ORMs, Hibernate JPA and EclipseLink JPA have isues
> with generating SQL for trivial JPQL queries such as:
> select object(c) from Customer c where ((name: is null) or (c.name = name:))
> where name: is a parameter
> For why this is a fundamental issue, please see a minimalistic JPQL query at
> http://en.wikipedia.org/wiki/Java_Persistence_Query_Language#Examples
> Part of this has already been resolved by issue "Add support for
> setObject(<arg>, null)"
> https://issues.apache.org/jira/browse/DERBY-1938
> Please see EclipseLink and Hibernate test cases for verification.
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