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From "Dyre Tjeldvoll (JIRA)" <derby-...@db.apache.org>
Subject [jira] Commented: (DERBY-925) Implement new JDBC 4 metadata API getFunctionParameters()
Date Tue, 07 Mar 2006 09:54:41 GMT
    [ http://issues.apache.org/jira/browse/DERBY-925?page=comments#action_12369193 ] 

Dyre Tjeldvoll commented on DERBY-925:
--------------------------------------

First of all, metadata.properties WILL have to change for JDBC 4.0, and it already has. David
has already added new queries for getFunctions and getFunctionParameters (and others I think),
but they only return empty resultsets. For DERBY-924 I changed the query for getFunctions
to return the correct values, but I have not created a system procedure that invokes this
method so that it can be used in client server mode. 

I guess that means that a JDBC 4.0 client that tries to invoke getFunctions will get a "no
such PROCEDURE" error or something, but I have not verified this. I guess this depends on
the implementation of DatabaseMetaData in the client? 

I don't know how the jvm version affects this. Presumably it would still be possible to run
an old version of Derby in java 1.6, but then one would get a "no such method" exception when
attempting to invoke the new methods?

For getProcdures and getProcedureColumns there should not be any upgrade issues, since they
already exist in JDBC 3.0. Note however, that metadata.properties will have to change for
these as well. A JDBC 4.0 client should be able to execute these methods against a JDBC 3.0
server without any problems as long as it doesn't attempt to access any of the new columns
in the returned result set. If it does, I expect that the conventional "no such column" exception
will be thrown (can be avoided by using ResultSetMetaData defensively, I think).

> Implement new JDBC 4 metadata API getFunctionParameters()
> ---------------------------------------------------------
>
>          Key: DERBY-925
>          URL: http://issues.apache.org/jira/browse/DERBY-925
>      Project: Derby
>         Type: New Feature
>   Components: JDBC
>     Versions: 10.2.0.0
>  Environment: JDK 1.6
>     Reporter: David Van Couvering
>     Assignee: Dyre Tjeldvoll
>  Attachments: TypePrinter.java
>
> I am currently implementing this to return an empty result set so at least we're compliant,
but we should be able to provide real metadata here.

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