Subject looking for a featurelist of JCA-JDBC

I'm just evaluating firebird and JCA-JDBC.
One of the first sentence I found to JCA-JDBC
was: "Most useful JDBC functionality ("useful"
in the opinion of the developers)". That means to
me, this driver does not support a concrete JDBC
Version. Combined with JCA JDBC-Version 3.0 has to
be supported, but i found out that programmatically
update (resultSet.updateString(1, "Blah")) which is
requiered for JDBC-Version 2.0 is not supported.

Is there a list with functionalities of the JDBC-Spec which
are supported yet and which are not! That would be a great
help for me.

Hans Georg