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From "Pawel Fronczak (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-5489) getBinary() returns incorrect data after getObject() call on BLOB column
Date Mon, 31 Oct 2011 23:01:32 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5489?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pawel Fronczak updated DERBY-5489:
----------------------------------

    Attachment: SelectBlobBug.java

I have attached a code snippet reproducing this bug.
It requires the springframework-jdbc library to operate.
The mentioned sequence of getObject / getBytes methods is buried inside the JdbcTemplate.queryForList
method:
		Object obj = rs.getObject(index);
		(...)
		if (obj instanceof Blob) {
			obj = rs.getBytes(index);
		}

                
> 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
>    Affects Versions: 10.7.1.1, 10.8.2.2
>            Reporter: Pawel Fronczak
>         Attachments: SelectBlobBug.java
>
>
> 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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