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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-532) Support deferrable constraints
Date Tue, 13 May 2014 15:53:16 GMT

    [ https://issues.apache.org/jira/browse/DERBY-532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13996517#comment-13996517
] 

ASF subversion and git services commented on DERBY-532:
-------------------------------------------------------

Commit 1594255 from [~dagw] in branch 'code/trunk'
[ https://svn.apache.org/r1594255 ]

DERBY-532 Support deferrable constraints

Substituted BaseJDBCTestCase#dropTable for home grown version, we
prefer the standard way to do it.

> 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, 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-4.diff, derby-532-fk-5.diff,
derby-532-fk-5.stat, derby-532-fk-6.diff, derby-532-fk-6.stat, derby-532-fk-7.diff, derby-532-fk-7.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-metadata-queries.diff,
derby-532-metadata-queries.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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