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From "Kristian Waagan (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-1473) Add cut-off and truncation logic to streaming classes in the embedded driver
Date Thu, 10 Aug 2006 01:44:14 GMT
     [ http://issues.apache.org/jira/browse/DERBY-1473?page=all ]

Kristian Waagan updated DERBY-1473:
-----------------------------------

    Attachment: derby-1473-2a-streamingtests.diff
                derby-1473-2a-streamingtests.stat

'derby-1473-2a-streamingtests.diff' adds tests for the new (and old) streaming code in the
embedded driver.
I have some additional unit tests, but since I do not know where to put them yet, I have not
included them.

I also have a BigCLOBTest, but it fails for the client driver. DERBY-1559 might fix some of
the problems I see, and I will rerun my tests now and then to keep an eye on the status. Streaming
2G LOBs now works for embedded.

Patch is ready for review/commit.

> Add cut-off and truncation logic to streaming classes in the embedded driver
> ----------------------------------------------------------------------------
>
>                 Key: DERBY-1473
>                 URL: http://issues.apache.org/jira/browse/DERBY-1473
>             Project: Derby
>          Issue Type: Improvement
>          Components: JDBC
>    Affects Versions: 10.2.0.0
>            Reporter: Kristian Waagan
>         Assigned To: Kristian Waagan
>             Fix For: 10.2.0.0
>
>         Attachments: derby-1473-1a-streaming.diff, derby-1473-1a-streaming.stat, derby-1473-2a-streamingtests.diff,
derby-1473-2a-streamingtests.stat
>
>
> When streaming data to Derby, the application stream will be wrapped in a Derby-specific
stream to convert the data to the correct representation. At a minimum, this consists of getting
the data to the on-disk format used by Derby.
> The wrapping stream can be extended to provide the following features at an earlier stage:
>  a) Data cut-off when the maximum allowed size is exceeded
>  b) Truncation of trailing blanks where allowed
> Both features can reduce the amount of data needed to be kept in memory on insertion.
> Implementing this will require additional column/data type information in the streaming
class(es). The implementation must be able to handle streams for which the length is specified
and also streams with unknown/unspecified length.

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