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From "V.Narayanan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2923) Incorrect reading of nullable Blob/Clob columns during soft upgrade with client/server
Date Thu, 12 Jul 2007 14:55:08 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12512125
] 

V.Narayanan commented on DERBY-2923:
------------------------------------

I have looked at softupgradefix.diff  and it looks good to me. The getRsDRDATypes method is
being used only in one method in
DRDAStatement(getRsDRDATypes() ) and it is fine to leave the method as such now and go ahead
with the fix proposed.

+1.

> Incorrect reading of nullable Blob/Clob columns during soft upgrade with client/server
> --------------------------------------------------------------------------------------
>
>                 Key: DERBY-2923
>                 URL: https://issues.apache.org/jira/browse/DERBY-2923
>             Project: Derby
>          Issue Type: Bug
>          Components: Network Server
>    Affects Versions: 10.3.0.0, 10.3.1.0, 10.3.1.1
>         Environment: Client/server soft upgrade
>            Reporter: Øystein Grøvlen
>            Assignee: Øystein Grøvlen
>            Priority: Blocker
>             Fix For: 10.3.1.1
>
>         Attachments: SimpleBlobTest.java, softupgradefix.diff
>
>
> Select operations with client/server and soft upgrade mode will not see first byte of
the Blob/Clob if the LOB column is nullable.
> The reason seems to be that during soft upgrade, the network server does not prepend
the LOB data with the byte indicating whether the column is null or not.  Hence, the first
data byte will be interpreted by the client as the null byte, and the reading of the LOB will
start at the second byte.

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