IDENTITY_VAL_LOCAL() vs getGeneratedKeys()

[Paul J. Lucas]

        I noticed that PreparedStatement has a getGeneratedKeys()
        method.  I assume it's an alternate means of getting generated
        key values that IDENTITY_VAL_LOCAL() would get.  So I tried it.
        However, getGeneratedKeys() returns null.  I tried called
        prepareStatement() with a second argument of an int[], but it
        says "not implemented."
        So is getGeneratedKeys() supposed to work?  Or must I use
        IDENTITY_VAL_LOCAL() ?
	- Paul