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From "Kevin Sutter (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-63) Better pessimistic lock support for DB2 v8.2+
Date Tue, 24 Oct 2006 13:47:18 GMT
    [ http://issues.apache.org/jira/browse/OPENJPA-63?page=comments#action_12444315 ] 
            
Kevin Sutter commented on OPENJPA-63:
-------------------------------------

I was just taking a look at Igor's patch and it looks rather straight-forward.  But, my general
question is how do we (OpenJPA) want to support multiple versions of a given DB dictionary?
 Do we want a single dictionary and then do the version checks at runtime as Igor as presented?
 Or, do we want individual dictionaries for the versions that are supported and then load
the right one based on the configuration?  It seems like we could go either way.  Is there
a preference or a precedence that we should stick to?

Kevin

> Better pessimistic lock support for DB2 v8.2+
> ---------------------------------------------
>
>                 Key: OPENJPA-63
>                 URL: http://issues.apache.org/jira/browse/OPENJPA-63
>             Project: OpenJPA
>          Issue Type: Improvement
>          Components: jdbc
>         Environment: IBM DB2 UDB v8.2 or later
>            Reporter: Igor Fedorenko
>         Attachments: db2-selectForUpdate.patch
>
>
> There is new SELECT "FOR READ ONLY WITH RS USE AND KEEP EXCLUSIVE LOCKS" syntax in DB2
v8.2 and later that can be used to implement pessimistic locks for selects with multiple from
tables, subselects, inner/outer joins and so forth. I'll attach simple patch shortly.

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