[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2235) Support for null map-keys in <map> mappings
Christian Bauer (JIRA)
noreply at atlassian.com
Fri Jun 15 06:20:52 EDT 2007
[ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_27257 ]
Christian Bauer commented on HHH-2235:
--------------------------------------
You want to learn what the term "relation" means in the relational data model. Hint: it has nothing to do with "relationship". You also need to understand that "null value" means "I don't know something because it is not there". No part of a primary key can be unknown. Every table needs a primary key.
> Support for null map-keys in <map> mappings
> -------------------------------------------
>
> Key: HHH-2235
> URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2235
> Project: Hibernate3
> Issue Type: Bug
> Components: core
> Affects Versions: 3.2.0.ga
> Reporter: Igor Lobanov
> Priority: Minor
>
> I'm not sure if I should file it as a bug.
> Hibernate requires index column for <map> mappings to be not null. This is required by the code in AbstractCollectionPersister#readIndex(...), which raises exception if index column is null. However, when I override collection persister and force readIndex method to return null, everything seems to work fine. Hibernate allows me to work with maps using null value as a key. Though I havn't tested it extensivly yet.
> What is the reason for disallowing null values as a keys? If there are possible complicated error conditions, then this issue is a feature request for null-values support for <map> mappings. If there are no errors possible, then constraining such behavior is probably wrong.
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