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https://hibernate.atlassian.net/browse/HHH-1109
composite-key does not support null-values. Description. At present all legacy data with null-values in its composite-key could not be read properly by hibernate. While hibernate processes the resultset it returns null for that record and steps over to the next one. Think of a db-view, which combines two (or more) tables by outer-join.
https://hibernate.atlassian.net/browse/HHH-1109?oldIssueView=true
At present all legacy data with null-values in its composite-key could not be read properly by hibernate. While hibernate processes the resultset it returns null for that record and steps over to the next one. Think of a db-view, which combines two (or more) tables by outer-join.
https://community.oracle.com/thread/316339
Jul 19, 2005 · Not Null is a column level constraint, so you have to specify in the defination of each column. A constraint is only validated if you enter some value in that column or group of columns instead of Null. One way to enter value is Insert Into ABC (F_Name) Values ('Test'); Also take care for the case senstivity of Oracle data.
https://github.com/nhibernate/nhibernate-core/issues/1265
But moreover I would expect such a setup to have troubles similar to #1170 or NH-3634, notably in case of mappings using such a composite-id as a foreign key. Overall I think having a composite-id with nullable is simply invalid, and not supported as such. An id should map to a primary key, and a primary key does not support having nullables.
https://community.oracle.com/thread/411579
Aug 02, 2006 · Your query is ugly, it does not support values like '*' and it supports only characters. The proper way to write this would be where ( a.col1 = b.col1 or (a.col1 is null and b.col1 is null)) and ( a.col2 = b.col2 or (a.col2 is null and b.col2 is null)); but this is just the join, not the constraint!
https://blog.dbi-services.com/nulls-in-composite-keys/
Jul 12, 2016 · Once again, this is documented as: If any column of a composite foreign key is null, then the non-null portions of the key do not have to match any corresponding portion of a parent key. And this is what is specified in SQL-92: If no <match type> was specified then, for each row R1 of the referencing table,...
https://stackoverflow.com/questions/5538974/the-relationship-could-not-be-changed-because-one-or-more-of-the-foreign-key-pro
When a change is made to a relationship, the related foreign-key property is set to a null value. If the foreign-key does not support null values, a new relationship must be defined, the foreign-key property must be assigned another non-null value…
https://stackoverflow.com/questions/29976641/invalid-column-name-when-using-modelbuilder-to-create-composite-keys
Apr 30, 2015 · When a change is made to a relationship, the related foreign-key property is set to a null value. If the foreign-key does not support null values, a new relationship must be defined, the foreign-key property must be assigned another …
https://brockallen.com/2014/03/30/how-i-made-ef-work-more-like-an-object-database/
Mar 30, 2014 · When a change is made to a relationship, the related foreign-key property is set to a null value. If the foreign-key does not support null values, a new relationship must be defined, the foreign-key property must be assigned another …
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