[jira] [Comment Edited] (DERBY-532) Support deferrable constraints

["Dag H. Wanvik (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13965694#comment-13965694 ] 

Dag H. Wanvik edited comment on DERBY-532 at 4/10/14 6:57 PM:
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Uploading patch derby-532-fk-3, which relative to version 1 adds invalidation of saved rows for deferred foreign key constraints and adds tests for that. In addition this led to uncovering some issues with invalidation for unique constraints as well, also fixed here.
I don't know of missing functionality for deferred foreign keys by now, so I'll look to committing this patch modulo review comments - reviews welcome at this point!
Next, I plan to add more tests for more complicated use cases.


was (Author: dagw):
Uploading patch derby-532-fk-3, which relative to version 2 adds invalidation of saved rows for deferred foreign key constraints and adds tests for that. In addition this led to uncovering some issues with invalidation for unique constraints as well, also fixed here.
I don't know of missing functionality for deferred foreign keys by now, so I'll look to committing this patch modulo review comments - reviews welcome at this point!
Next, I plan to add more tests for more complicated use cases.

> Support deferrable constraints
> ------------------------------
>
>                 Key: DERBY-532
>                 URL: https://issues.apache.org/jira/browse/DERBY-532
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Jörg von Frantzius
>            Assignee: Dag H. Wanvik
>              Labels: derby_triage10_11
>             Fix For: 10.11.0.0
>
>         Attachments: IndexDescriptor.html, IndexDescriptorImpl.html, IndexRowGenerator.html, SortObserver.html, deferredConstraints.html, deferredConstraints.html, deferredConstraints.html, deferredConstraints.html, deferredConstraints.html, derby-532-allow-pk-unique-1.diff, derby-532-allow-pk-unique-1.status, derby-532-check-constraints-1.diff, derby-532-check-constraints-1.stat, derby-532-check-constraints-2.diff, derby-532-check-constraints-2.stat, derby-532-fix-drop-not-nullable.diff, derby-532-fix-drop-not-nullable.status, derby-532-fix-metadata-1.diff, derby-532-fix-metadata-1.status, derby-532-fk-1.diff, derby-532-fk-3.diff, derby-532-fk-3.stat, derby-532-fk-baseline-2.diff, derby-532-fk-baseline.diff, derby-532-import-1.diff, derby-532-import-1.status, derby-532-import-2.diff, derby-532-import-3.diff, derby-532-import-3.status, derby-532-more-tests-1.diff, derby-532-more-tests-1.stat, derby-532-nullableUniqueFix.diff, derby-532-nullableUniqueFix.status, derby-532-post-scan-1.diff, derby-532-post-scan-1.stat, derby-532-post-scan-2.diff, derby-532-post-scan-2.stat, derby-532-post-scan-3.diff, derby-532-post-scan-3.stat, derby-532-post-scan-4.diff, derby-532-post-scan-4.stat, derby-532-serializable-scan-1.diff, derby-532-serializable-scan-2.diff, derby-532-serializable-scan-2.stat, derby-532-syntax-binding-dict-1.diff, derby-532-syntax-binding-dict-1.status, derby-532-syntax-binding-dict-2.diff, derby-532-syntax-binding-dict-2.status, derby-532-syntax-binding-dict-all-1.diff, derby-532-test-speedup.diff, derby-532-test-speedup.status, derby-532-test-with-default-deferrable-all-over.diff, derby-532-testAlterConstraintInvalidation.diff, derby-532-testAlterConstraintInvalidation.status, derby-532-unique-pk-1.diff, derby-532-unique-pk-1.status, derby-532-unique-pk-2.diff, derby-532-unique-pk-3.diff, derby-532-unique-pk-3.status, derby-532-upgrade-1.diff, derby-532-upgrade-1.status, derby-532-upgrade-1b.diff, derby-532-xa-1.diff, derby-532-xa-2.diff, derby-532-xa-3.diff, derby-532-xa-3.status
>
>
> In many situations it is desirable to have constraints checking taking place only at transaction commit time, and not before. If e.g. there is a chain of foreign key constraints between tables, insert statements have to be ordered to avoid constraint violations. If foreign key references are circular, the DML has to be split into insert statements and subsequent update statements by the user.
> In other words, with deferred constraints checking, life is much easier for the user. Also it can create problems with softwares such as object-relational mapping tools that are not prepared for statement ordering and thus depend on deferred constraints checking.



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