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https://issues.apache.org/jira/browse/DERBY-4653?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871194#action_12871194
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Lily Wei commented on DERBY-4653:
---------------------------------
Hi Knut:
Thank you so much for the prompt response. I did svn update and up to
revision 948072 and upgrade my jdk to 1.6.0_20.
For some reasons, the test in BooleanValuesTest is not running.
$ java junit.textui.TestRunner
org.apache.derbyTesting.functionTests.tests.lang.B
ooleanValuesTest
..........
Time: 8.245
OK (10 tests)
$ java -version
java version "1.6.0_20"
Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
Java HotSpot(TM) Client VM (build 16.3-b01, mixed mode, sharing)
$ svn update
At revision 948072.
> Avoid unnecessary round-trip for commit/rollback in the client driver
> ---------------------------------------------------------------------
>
> Key: DERBY-4653
> URL: https://issues.apache.org/jira/browse/DERBY-4653
> Project: Derby
> Issue Type: Improvement
> Components: JDBC, Network Client
> Affects Versions: 10.7.0.0
> Reporter: Kristian Waagan
> Assignee: Lily Wei
> Priority: Minor
> Attachments: DERBY-4653-1.diff
>
>
> The methods Connection.commit() and Connection.rollback() in the client
> driver cause a round-trip to the server even if the commit/rollback is
> unnecessary (i.e. there is nothing to commit or roll back).
> Comments suggest (see below) that this can be optimized, such that the
> commands are flowed to the server only when required. It can be seen that
> this optimization has been used other places in the client driver. Never the
> less, it must be checked that this optimization doesn't have side-effects.
> This issue came up in connection with connection pooling, where a pool
> implementation always issued a rollback to make sure there was no active
> transaction on the connection handed out.
> From Connection.flowCommit:
> // Per JDBC specification (see javadoc for Connection.commit()):
> // "This method should be used only when auto-commit mode has been
> disabled."
> // However, some applications do this anyway, it is harmless, so
> // if they ask to commit, we could go ahead and flow a commit.
> // But note that rollback() is less harmless, rollback() shouldn't be
> used in auto-commit mode.
> // This behavior is subject to further review.
> // if (!this.inUnitOfWork)
> // return;
> // We won't try to be "too smart", if the user requests a commit,
> we'll flow a commit,
> // regardless of whether or not we're in a unit of work or in
> auto-commit mode.
> //
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