[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-2235) Support for null map-keys in <map> mappings
[
http://opensource.atlassian.com/projects/hibernate/browse/HHH-2235?page=c...
]
Ulf gohde commented on HHH-2235:
--------------------------------
nonsense. The following sql (oracle) is completely valid. No primary key.
CREATE Table CW_WATERMARK
(
TYPE_ID NUMBER(11) NOT NULL,
BLOB_NAME NVARCHAR2(40) NOT NULL,
USER_STATE NVARCHAR2(80),
TEXT NVARCHAR2(40) NOT NULL,
FONT_SIZE NUMBER(4) NOT NULL,
X_COORDINATE NUMBER(4) NOT NULL,
Y_COORDINATE NUMBER(4) NOT NULL
);
ALTER TABLE CW_WATERMARK
Add constraint u_watermark unique (TYPE_ID, BLOB_NAME, USER_STATE);
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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