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Date: Tue, 19 Jun 2007 05:54:26 -0700 (PDT)
From: "V.Narayanan (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=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12506147 ] 

V.Narayanan commented on DERBY-2763:
------------------------------------

I have addressed the javadoc issues pointed out here in https://issues.apache.org/jira/browse/DERBY-2846.

Thanx again for pointing this out.

> 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, Approach_3.diff, Approach_3.stat, Approach_4.diff, Approach_4.stat, LOBLengthPersists.java, UpdateSensitiveStreamsForClient_v1.diff, UpdateSensitiveStreamsForClient_v1.stat, UpdateSensitiveStreamsForClient_v2.diff, UpdateSensitiveStreamsForClient_v2.stat, UpdateSensitiveStreamsForClient_v3.diff, UpdateSensitiveStreamsForClient_v3.stat, UpdateSensitiveStreamsForClient_v4.diff, UpdateSensitiveStreamsForClient_v4.stat
>
>
> Currently the Embedded and Network Client would differ 
> in behaviour when the following series of steps is 
> 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 
> constructor of the locator Stream returned (in the 
> 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.

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