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https://issues.apache.org/jira/browse/DERBY-3574?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12586918#action_12586918
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Tiago R. Espinha commented on DERBY-3574:
-----------------------------------------
I have attached Knut's implementation with a twist. I did use an integer as a
counter, as apparently the UUID class is only for Java 1.5+ and the integer is
just as good.
Anyway, the twist is:
Instead of doing the check on checkValidity(), I added the transactionID_ to
the Lob class. This is better since we want the same check for all kinds of
Lobs. Since Lob doesn't have a checkValidity(), I've added the check to the
sqlLength() method and I throw an exception there.
The Connection.java also has a transactionID_ now, which is the "index" of the
current transaction. It's private and it should never be altered, except for
the increment done on the commit() method.
> With client, attempting to get the lob length after commit or connection
> close if there was a call to length() before commit does not throw an
> exception
> ----------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-3574
> URL: https://issues.apache.org/jira/browse/DERBY-3574
> Project: Derby
> Issue Type: Bug
> Components: JDBC, Network Client, Newcomer
> Affects Versions: 10.5.0.0
> Reporter: Kathey Marsden
> Assignee: Tiago R. Espinha
> Priority: Trivial
> Attachments: derby3574-connection-java.patch,
> derby3574-lob-java.patch, TestLobLength.java
>
>
> Attempting to get call Blob/Clob.length() after commit or connection close
> does not fail if there was a previous call to length(). If no previous call
> was made an exception is thrown as expected.
> See attached program TestLobLength for repro with commit. If you comment out
> the two lines to get the length before the commit we get the expected
> exception.
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