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Date: Tue, 12 Jun 2007 23:45:26 -0700 (PDT)
From: "Anurag Shekhar (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Commented: (DERBY-2763) In the Network Client InputStreams
 and Readers returned from LOB's should be sensitive to underlying LOB data
 changes.
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    [ https://issues.apache.org/jira/browse/DERBY-2763?page=3Dcom.atlassian=
.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12504138 ]=20

Anurag Shekhar commented on DERBY-2763:
---------------------------------------

> 4) Here is an issue for the documentation noted in my=20
>earlier comment today: =C3=98ystein's use case is supported=20
>only if a rewritten chunk is exactly the same length as=20
>the chunk it is replacing.=20

Blob.setBytes or OutputStream.write always overwrites the=20
bytes of same length.Even in case of Clob, setString or=20
Writer.write will replace chars of same length.


> In the Network Client InputStreams and Readers returned from LOB's should=
 be sensitive to underlying LOB data changes.
> -------------------------------------------------------------------------=
---------------------------------------------
>
>                 Key: DERBY-2763
>                 URL: https://issues.apache.org/jira/browse/DERBY-2763
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Client
>    Affects Versions: 10.3.0.0
>            Reporter: V.Narayanan
>            Assignee: V.Narayanan
>             Fix For: 10.3.0.0
>
>         Attachments: Approach_2.diff, Approach_2.stat, Approach_2.txt, Ap=
proach_3.diff, Approach_3.stat, Approach_4.diff, Approach_4.stat, LOBLength=
Persists.java, UpdateSensitiveStreamsForClient_v1.diff, UpdateSensitiveStre=
amsForClient_v1.stat
>
>
> Currently the Embedded and Network Client would differ=20
> in behaviour when the following series of steps is=20
> followed.
> a) Create an empty Blob
> b) get an InputStream using Blob.getBinaryStream()
> c) write data into this Blob
>    c.1) Get an OutputStream
>    c.2) Use OutputStream.write(byte [] b) to write
>         into this Blob.
> d) Now read from the InputStream obtained in step b)
>    and print the number of bytes read as output.
> The output of step d) differs in the client and in the Embedded side.
> In the Client
> -------------
> The number of bytes read would always be -1.
> In the Embedded
> ---------------
> The number of bytes would be the number of bytes we
> reflected.
> The above behaviour in the NetworkClient is because
> the length of the Blob is read once and stored in the=20
> constructor of the locator Stream returned (in the=20
> attribute maxPos).
> This instead should be read each time we use the streams.
> A similar issue exists for Clobs also.
> I will raise a seperate JIRA issue for this.

--=20
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