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https://issues.apache.org/jira/browse/DERBY-6082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13791937#comment-13791937
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Dyre Tjeldvoll commented on DERBY-6082:
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I looked a bit at the client code, and AFAICT openOnServer is still being used
as described. It is set to false when committing or rolling back a tx, and a
PRPSQLSTT is sent (before executing) if this variable is false. And the server
will prepare the statement when receiving the command, but there appears to be
tests in GenericStatement.prepMinion() that
# Skips the prepare if its already up-to-date
# Then tries to locate it in the cache
Which perhaps explains why there is no trace of a reprepare in derby.log?
It may well be that the reprepare request is unnecessary, though.
> Investigate if openOnServer_ field in org.apache.derby.client.am.Statement is
> still needed.
> -------------------------------------------------------------------------------------------
>
> Key: DERBY-6082
> URL: https://issues.apache.org/jira/browse/DERBY-6082
> Project: Derby
> Issue Type: Task
> Components: Network Client
> Affects Versions: 10.10.1.1
> Reporter: Mamta A. Satoor
>
> While working on DERBY-6053, there was some discussion over openOnServer_
> field in org.apache.derby.client.am.Statement. This field has following
> comment in Statement class
> // This means a DERBY server-side section for this statement is in the
> prepared state.
> // A client-side jdbc statement may remain open across commits
> (openOnClient=true),
> // but the server-side DERBY section moves to an unprepared state
> (openOnServer=false) across commits,
> // requiring an implicit re-prepare "under the covers" by the driver.
> // Unprepared jdbc query statements still have prepared sections on the
> server.
> // This openOnServer_ only has implications for preparedstatement
> Kathey commented following on that field in DERBY-6053
> *******************************************************************************
> I do not think that comment is true about statements not staying prepared
> across commits.
> If I prepare a statement and execute it twice with a commit in between from
> client, I do not see a reprepare in the derby.log . I think maybe the
> openOnServer_ property may be a relic of some place or time in the original
> code base when that was true.
> *******************************************************************************
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