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https://issues.apache.org/jira/browse/DERBY-532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13751274#comment-13751274
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Dag H. Wanvik edited comment on DERBY-532 at 8/27/13 2:00 PM:
--------------------------------------------------------------
Uploading derby-532-syntax-binding-dict-all-1, which includes the two first
patches plus adjusts the patch to work on current trunk, and also adds the
extra documentation requested by Rick (in SYSCONSTRAINTSRowFactory).
Regressions went ok.
was (Author: dagw):
Uploading derby-532-syntax-binding-dict-all-1, which includes the two first
patches plus adjust the patch to work on current trunk, and also adds the extra
documentation requested by Rick (in SYSCONSTRAINTSRowFactory). Regressions
went ok.
> 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
> Attachments: deferredConstraints.html, deferredConstraints.html,
> 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
>
>
> 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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