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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-2495) Create framework for calling locator related stored procedures from client
Date Mon, 16 Apr 2007 10:07:15 GMT

     [ https://issues.apache.org/jira/browse/DERBY-2495?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Kristian Waagan updated DERBY-2495:

    Derby Info:   (was: [Patch Available])

Committed 'blobframework_v2.diff' to trunk with revision 529185.

Very nicely commented patch Øystein!

I reviewed the patch and have the following suggestions/comments for a followup patch:
 1) Would a comment that all the new set-/getX methods use 1-based indexes be helpful?
 2) Invalid @see tag in CallableLocatorProcedures (class JavaDoc).
 3) Any reason why CallableLocatorProcedures.connection isn't final?
 4) Can you get the value of VARCHAR_MAXWIDTH from somewhere, or use an existing constant?
    I would also make it private to signal that it is not supposed to be used outside this
class (I seem to recall that it is defined in another class already).
 5) CallableLocatorProcedures.blobTruncate could add newlines around the paragraph tag.
 6) Why use new String("") in CallableLocatorProcedures.clobGetSubString?

The methods using repeated procedure calls for large values is a bit tricky, so I hope there
will be some (boundary) tests in place when the code is enabled.


> Create framework for calling locator related stored procedures from client
> --------------------------------------------------------------------------
>                 Key: DERBY-2495
>                 URL: https://issues.apache.org/jira/browse/DERBY-2495
>             Project: Derby
>          Issue Type: Sub-task
>          Components: Network Client
>            Reporter: Øystein Grøvlen
>         Assigned To: Øystein Grøvlen
>             Fix For:
>         Attachments: blobframework.diff, blobframework_v2.diff, blobframework_v2.diff
> The client JDBC driver will need to call stored procedures (ref DERBY-2257) to operate
on LOBs identified by locators.  We should create a framework that implement the stored procedure
calls.  This way, the rest of the client code can call methods in this framework when needing
to call the stored procedures without having to prepare SQL statements themselves.  
> The framework should make sure that prepared statements are reused within a connection.
 Each procedure call should only be prepared once per connection.
> Since LOBs can not be parameters to stored procedures, the framework should make sure
that calls involving a byte[] or String that does not fit in a VARCHAR (FOR BIT DATA), are
split into several calls each operating on a fragment of the LOB.

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