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From "Daniel John Debrunner (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-690) Add scrollable, updatable, insensitive result sets
Date Mon, 27 Feb 2006 15:10:32 GMT
    [ http://issues.apache.org/jira/browse/DERBY-690?page=comments#action_12367965 ] 

Daniel John Debrunner commented on DERBY-690:
---------------------------------------------

Andreas wrote:

> A transaction can always see its own uncommitted changes in the database, so it does
not
> conflict with any isolation levels that the ResultSet sees uncommitted data of its own
transaction. 

Agreed, but I see it that in this case the ResultSet does not hold an uncommitted row, it
holds a row in a state that never existed on the database, due to server-side logic.  No other
select can ever return the values seen in the SUR  for that row, I don't see this as the same
as an uncommitted row in the database.

Dag wrote: [
[oracle behaviour snipped]

Thanks for investigating that Dag.

> Should we be strictly JDBC compliant or choose a more "reasonable" behavior? 

I need to think a little more about why you think oracle's behaviour is not JDBC compliant
(excluding supporting refreshRow with an insensitive rs)






> Add scrollable, updatable, insensitive result sets
> --------------------------------------------------
>
>          Key: DERBY-690
>          URL: http://issues.apache.org/jira/browse/DERBY-690
>      Project: Derby
>         Type: New Feature
>   Components: JDBC
>     Reporter: Dag H. Wanvik
>     Assignee: Dag H. Wanvik
>     Priority: Minor
>  Attachments: DERBY-690-v1.diff, DERBY-690-v1.stat, DERBY-690-v2.diff, DERBY-690-v2.stat,
SURChanges-v1.pdf, sur-proposal.txt, writeup-v1.html, writeup-v2.html
>
> JDBC result sets are created with three properties: type, concurrency
> and holdability. The type can be one of TYPE_FORWARD_ONLY,
> TYPE_SCROLL_INSENSITIVE and TYPE_SCROLL_SENSITIVE. The concurrency can
> be one of CONCUR_READ_ONLY and CONCUR_UPDATABLE. The holdability can
> be one of HOLD_CURSORS_OVER_COMMIT and CLOSE_CURSORS_AT_COMMIT.
> JDBC allows the full cross product of these. SQL 2003 prohibits the
> combination {TYPE_SCROLL_INSENSITIVE, CONCUR_UPDATABLE}, but this
> combination is supported by some vendors, notably Oracle.
> Currently, Derby supports JDBC result sets in a limited
> way. Holdability is supported. Furthermore, the following is
> supported: 
> 	   - forward-only, read-only 
> 	   - forward-only, updatable (update, delete, but not insert)
> 	     Also, in the network driver, support for some data types
> 	     conversions is missing.
> 	   - scroll insensitive, read-only
> We (Fernanda and Andreas will cooperate with me on this) propose a
> plan to add support for the combination:
> 	   - scroll insensitive, updatable
> for both the embedded driver and the network client driver. 
> As a part of this we would also like to add the missing insert
> operation to the {forward-only, updatable} result sets (JIRA-100), and
> remove the requirement for an explicit "FOR UPDATE" clause in the SQL
> query to achieve updatability if CONCUR_UPDATABLE is specified
> (JIRA-231).
> The full proposal text is uploaded as an attachment, including a proposed
> functional specification.
> This JIRA will  be used to track sub-issues for this effort. The sub-issues will be linked
back to this issue.

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