From: makska at yandex.ru (Maxim)
Date: Tue, 8 Aug 2006 17:51:09 +0400
Subject: [Pljava-dev] Custom java objects
Message-ID: <12743.060808@yandex.ru>

Hello,

I try to write aggregate function in Java for PostgeeSQL 8.1.

I just want to know, are there any ways to pass custom java objects
thorough iterations of row handler?

For example, I have functions in PostgreSQL (a is a table):

CREATE FUNCTION handler1(a, a)
returns a
as 'functions.handler1'
immutable language java;

CREATE FUNCTION handler2(a)
returns a
as 'functions.handler2'
immutable language java;

CREATE AGGREGATE aa ( BASETYPE = a, SFUNC = handler1, STYPE = a, FINALFUNC = handler2);


And two functions in Java:

    public static boolean handler1(ResultSet a, ResultSet record, ResultSet result) throws Exception {
        int v = a == null ? Integer.MIN_VALUE : a.getInt(1);
        if (record.getInt(1) > v) {
            result.updateInt(1, record.getInt(1));
            result.updateString(2, record.getString(2));
        } else {
            result.updateInt(1, a.getInt(1));
            result.updateString(2, a.getString(2));
        }
        return true;
    }

    public static boolean handler2(ResultSet a, ResultSet result) throws Exception {
        if (a == null) return false;
        result.updateInt(1, a.getInt(1));
        result.updateString(2, a.getString(2));
        return true;
    }

    
I Just want to use custom java object instead of "ResultSet a".



-- 
Best regards,
 Maxim Karavaev,
 ISP RAS (www.ispras.ru)