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From "Tomohito Nakayama (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-778) It should be restricted only once to retrieve stream, not only from resultset, but also from blob.
Date Wed, 21 Dec 2005 15:10:31 GMT
    [ http://issues.apache.org/jira/browse/DERBY-778?page=comments#action_12361049 ] 

Tomohito Nakayama commented on DERBY-778:
-----------------------------------------

I confirm javadoc of Java API and found next sentence .
 A Blob object is valid for the duration of the transaction in which is was created. 
http://java.sun.com/j2se/1.4.2/docs/api/java/sql/Blob.html

Futhermore, I found method java.sql.Blob#getBytes(long pos, int length) , which suggest api
intend to make it able to get bytes from Blob object at randum .

I understand that Daniel's comment is right.

> It should be restricted only once to retrieve stream, not only from resultset, but also
from blob.
> --------------------------------------------------------------------------------------------------
>
>          Key: DERBY-778
>          URL: http://issues.apache.org/jira/browse/DERBY-778
>      Project: Derby
>         Type: Bug
>   Components: JDBC, Network Client
>     Reporter: Tomohito Nakayama
>     Assignee: Tomohito Nakayama
>  Attachments: testLob3.java
>
> Restriction to retrieve stream from a result set  only once was made by DERBY-721.
> However there remains *means of escape* to retrieve stream twice using Lob.
> This means of escape should be restricted in order to avoid caching stream in Network
Client Driver .

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