db-derby-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Fernanda Pizzorno (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-690) Add scrollable, updatable, insensitive result sets
Date Wed, 01 Mar 2006 22:36:18 GMT
    [ http://issues.apache.org/jira/browse/DERBY-690?page=comments#action_12368384 ] 

Fernanda Pizzorno commented on DERBY-690:
-----------------------------------------

Dag wrote:
> In our implementation, a positioned UPDATE (for the same result set) 
> is considered an "own" change, cf. the write-up. It would be hard to 
> differentiate since the implementation of updateRow piggybacks the 
> positioned update

If we decide to refresh the row instead of only seeing the results of
updateXXX methods, the reason why we chose to consider positioned
updates as "own" changes will no longer be there. Then we can only 
refresh the row when an updateRow is executed, and stop considering
positioned updates as "own" changes.

Dan wrote:
> [...] Hence, like Oracle, Derby should perform the equivalent of a 
> refreshRow. 

Do you mean that we should also, like Oracle, allow users to use the 
refreshRow() method to get an updated row, or should it still be a 
no-op when it is not being called from within the updateRow() method?

> 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.

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators:
   http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see:
   http://www.atlassian.com/software/jira


Mime
View raw message