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https://issues.apache.org/jira/browse/DERBY-716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12490135
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Rick Hillegas commented on DERBY-716:
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Dan> It's not that it's a lot of work for anyone, it moves to a model where an
application that wants to support multiple JDBC environments has two unpleasant
choices:
I think that Øystein ran some experiments using Derby 10.1 (supporting JDBC3)
on Java 6 (which defines JDBC4). I think that Derby's JDBC3 ResultSets worked
fine on Java 6 because the testing application never called JDBC4-specific
methods. I'm cautiously hopeful that an application which needs to run on
multiple VM revs can succeed as long as it codes to the least-common
denominator.
I don't have any experience trying to run the same code on Java SE and Java ME.
I have only very limited experience trying to code an application to run both
places. My limited experience suggests that most people in this situation will
end up writing a portablitliy layer, or even two implementations because
desktop users will refuse to live with the limitations imposed by by the
small-device environment.
> Re-enable VTIs
> --------------
>
> Key: DERBY-716
> URL: https://issues.apache.org/jira/browse/DERBY-716
> Project: Derby
> Issue Type: New Feature
> Components: SQL
> Reporter: Rick Hillegas
> Attachments: functionTables.html
>
>
> Cloudscape used to expose Virtual Table Interfaces, by which any class which
> implemented ResultSet could be included in a query's FROM list. Derby still
> exposes a number of these VTIs as diagnostic tools. However, Derby now
> prevents customers from declaring their own VTIs. The parser raises an error
> if a VTI's package isn't one of the Derby diagnostic packages.
> This is a very powerful feature which customers can use to solve many
> problems. We should discuss the reasons that it was disabled and come up with
> a plan for putting this power back into our customers' hands.
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