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From "Anurag Shekhar (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-2712) If large clob is updated after Reader. the reader continues to point to old data
Date Mon, 11 Jun 2007 09:15:26 GMT

     [ https://issues.apache.org/jira/browse/DERBY-2712?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Anurag Shekhar updated DERBY-2712:

    Attachment: derby-2712.diff

I have modified EmbedClob.getCharacterStream to return ClobUpdateableReader. ClobUpdateableReader
is modifed to detect if the Clob has moved from Readonly InternalClob to a writable InternalClob.
If the EmbedClob moves from readonly mode to writable mode it fetches the input stream again
from the EmbedClob and skips to the current position.
Code to invalidate the internal Reader in case the underlying stream is modified was already
part of this Reader.

Updated files
Added two methods
		ClobUpdateableReader uses this methods to determine if the Clob has swtched from a readonly
InternalClob to a writable InternalClob.
		ClobUpdateableReader uses this method if it detects Clob is modified since creating ClobUpdateableReader.
Modified getCharacterStream() to return ClobUpdateableReader.


added a new constructor. This constructor will be used by EmbedClob. It accepts Clob as a
parameter Clob object is used to check if the InternalClob its using is writable or not. In
case it was read only in the begning ClobUpdateableReader uses getInternalStream to refresh
the stream after it switches to writable InternalClob.

Added a new private method updateIfRequired which is called in every method to check if the
underlying stream has changed.


Added a new test for switching from StoreStream to ClobStreamControl.

> If large clob is updated after Reader. the reader continues to point to old data
> --------------------------------------------------------------------------------
>                 Key: DERBY-2712
>                 URL: https://issues.apache.org/jira/browse/DERBY-2712
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions:
>            Reporter: Anurag Shekhar
>         Attachments: derby-2712.diff
> If a Reader is fetched from a large clob (obtained from ResultSet) a reader linked to
the dvd stream is returned once a set method is called on it the clob data is materialized
in control class but the Reader returned previously continues to point to old data.

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