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From "Patrick Linskey (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-130) Streaming LOB support
Date Mon, 21 May 2007 22:00:29 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12497601
] 

Patrick Linskey commented on OPENJPA-130:
-----------------------------------------

Ignacio Andreu will be working on this issue for the Google Summer of Code project. It would
seem that JIRA only allows me to assign issues to committers, so I'm assigning it to myself
to keep it out of the unassigned queue.

> Streaming LOB support
> ---------------------
>
>                 Key: OPENJPA-130
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-130
>             Project: OpenJPA
>          Issue Type: New Feature
>          Components: datacache, jdbc, jpa, kernel
>            Reporter: Patrick Linskey
>         Assigned To: Patrick Linskey
>             Fix For: 1.1.0
>
>
> BLOB and CLOB fields can only be mapped in their entirety in OpenJPA. It would be nice
to support fields of type java.io.InputStream (for BLOBs) and java.io.Reader (for CLOBs).
> The usage pattern could look like so:
> @Entity
> public class Employee {
>     ...
>     private InputStream photoStream;
>     public void setPhotoStream(InputStream in) {
>         photoStream = in;
>     }
>     public InputStream getPhotoStream() {
>         return photoStream;
>     }
> }
> So, when the user wants to provide a stream, she will set the InputStream field, and
when the user wants to obtain a stream, she will use the field.
> The behavior of such an implementation would be a bit different than how other fields
work, in that if the user set the stream and then consumed it within a single transaction,
presumably no data would be written out to the database at commit time. But that is the nature
of streams.
> (FTR, I think that I stole this idea from an email Craig Russell sent out years ago.)

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