Re: User Defined Types in Java

On Thu, Feb 09, 2006 at 01:08:01PM +0100, Thomas Hallgren wrote:
> Hi,
> I'd like to enable UDT's written in Java and made some initial trial and
> error. I don't get very far. Here's what I do:
>
> I take the 'complex' type example described in '31.11 User-Defined
> Types' and change it to use Java functions (see below). But I get:
>
> ERROR: type "complex" does not exist

If you look at the code it says in a comment:

/*
* Only C-coded functions can be I/O functions. We enforce this
* restriction here mainly to prevent littering the catalogs with
* shell types due to simple typos in user-defined function
* definitions.
*/

However, you could probably work around this like so:

CREATE FUNCTION dummy(cstring) RETURNS complex AS [random existing
function] LANGUAGE INTERNAL;

This will create the shell type. You then create your other functions
and finally the type, at which point you can delete the dummy function
again.

Roundabout, but it should work (I hope). Note, if you have a validator
on your java code that tries to lookup the return type, you might get
some interesting issues.

Have a nice day,
--
Martijn van Oosterhout <kleptog(at)svana(dot)org> http://svana.org/kleptog/
> Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a
> tool for doing 5% of the work and then sitting around waiting for someone
> else to do the other 95% so you can sue them.