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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-1615) Rewrite the Clob implementation in the client driver
Date Fri, 08 May 2009 09:23:46 GMT

    [ https://issues.apache.org/jira/browse/DERBY-1615?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12707286#action_12707286
] 

Kristian Waagan commented on DERBY-1615:
----------------------------------------

No, the issue isn't complete. Most of the recent work has been in the core LOB implementation
in the embedded driver. Some work has also been done on the client implementation.
The question is more whether it will ever be fixed in the near future, or if we should resolve
it as either "Later" or "Won't fix".

Rewriting the Clob implementation in the client driver could very well boost maintainability
in the long term and result in increased performance, but at the same time it is likely that
new bugs will be introduced (despite our test suite). We may also need some substantial changes
in the client/server communication. To me, it sounds like these changes should go into a new
major version release (i.e. 11.0).

If  nobody objects, I'll set the affects version to 11.0, and resolve the issue as "Later".

> Rewrite the Clob implementation in the client driver
> ----------------------------------------------------
>
>                 Key: DERBY-1615
>                 URL: https://issues.apache.org/jira/browse/DERBY-1615
>             Project: Derby
>          Issue Type: Improvement
>          Components: JDBC, Network Client
>            Reporter: Kristian Waagan
>
> The implementation of java.sql.Clob in the client driver is cracking up, and should be
rewritten.
> A number of bugs have been discovered, and the implementation has traces of old and/or
deprecated features. Further, several mandatory methods (JDBC 3 & 4) have not yet been
implemented and could benefit from a fresh start.
> I think maintainability for this piece of code has dropped to an unacceptable level.
> It seems the implementation is based on an assumption that no longer holds; that a Clob
object used for input to the database is never passed to the user. The consequence of this,
is that the internal state of the Clob object is not valid [at all times], which causes exceptions
when the user invokes methods on it.
> A number of related Jira issues have been linked to this issue to aid the reimplementation
process.

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