[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2235) Support for null map-keys in <map> mappings
Ulf gohde (JIRA)
noreply at atlassian.com
Fri Jun 15 09:33:52 EDT 2007
[ http://opensource.atlassian.com/projects/hibernate/browse/HHH-2235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_27267 ]
Ulf gohde commented on HHH-2235:
--------------------------------
You're definitely right about oracle having crazy ideas about null. It is almost a religious topic for them. And the fact that a query for SOMETHINIG != 'bla' does not give you rows with a null in that column back is aways driving me mad....
Just tested on SQLServer. You are right. As soon as I have one entry with null in the compound key I can not insert a second one with null even if the other columns are different. That's pretty weird behaviour.
I guess that invalidates my request....
Thanks for your time.
> 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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