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https://issues.apache.org/jira/browse/DERBY-5489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13259535#comment-13259535
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Kristian Waagan commented on DERBY-5489:
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I committed the test (patch 1b) to trunk with revision 1329186.
Thank you for your opinion, Knut Anders.
Based on your feedback and my own opinion, I will keep the special treatment of
getBytes and getString.
Regarding the suggested refactoring, I will do so to more clearly document the
special treatment. Note that the getters belong to two different result set
implementations, so I still need two helper methods.
> getBinary() returns incorrect data after getObject() call on BLOB column
> ------------------------------------------------------------------------
>
> Key: DERBY-5489
> URL: https://issues.apache.org/jira/browse/DERBY-5489
> Project: Derby
> Issue Type: Bug
> Components: JDBC
> Affects Versions: 10.7.1.1, 10.8.2.2
> Reporter: Pawel Fronczak
> Assignee: Kristian Waagan
> Labels: derby_triage10_9
> Attachments: SelectBlobBug.java, derby-5489-1a-test.diff,
> derby-5489-1b-test.diff, derby-5489-2a-fixes.diff, repro.diff
>
>
> When ResultSet.getObject(int) is called on a BLOB column, the correct
> EmbedBlob object is returned. But if afterwards the ResultSet.getBytes(int)
> is called on the same row, the returned array contains invalid data - it is
> offset by 3 bytes and its size is incorrect.
> The problem only occurs when the stored BLOB is large enough to be internally
> represented by stream and not by array of bytes (at least ~32KiB).
> It seems that the getObject method shifts the stream position and therefore
> the getBytes method starts to read the data after the third byte, thus
> incorrectly calculating its length.
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