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From "Donald Woods (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1595) OrderColumn does not maintain index upon inter-list element removal - Phase 2
Date Tue, 23 Mar 2010 01:19:27 GMT
OrderColumn does not maintain index upon inter-list element removal - Phase 2
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                 Key: OPENJPA-1595
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1595
             Project: OpenJPA
          Issue Type: Sub-task
          Components: jdbc
    Affects Versions: 2.0.0-M2
            Reporter: Jeremy Bauer
             Fix For: 2.1.0


The second phase will be to update the ChangeTracker to record the indexes of the updated
list items and to use that information to provide a more intelligent update strategy in the
handlers.

I fixed the non-spec compliant behavior described in this JIRA (ie. phase 1 - Per the latest
JPA 2.0 spec, a contiguous index value must be maintained.) but the second phase of the JIRA
has not been addressed: 

"The current reordering mechanism does a full delete and reinsert of the container/collection
table values if a reorder is required for inserts. For deletes, it just removes entries and
leaves an empty index value. The first phase of the fix will be to maintain contiguous ordering
using the same mechanism as inserts (delete/re-insert). The second phase will be to update
the ChangeTracker to record the indexes of the updated list items and to use that information
to provide a more intelligent update strategy in the handlers." 

A more spec related side effect of OpenJPA's current order column update strategy is that
the OrderColumn insertable and updatable attributes may not result in the behavior one may
expect since the db operations used to maintain the list do not exactly map to the db operations
indicated by these attributes. 

I spent a few days looking into implementing phase 2, but it turned into a non trivial exercise.



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