Maping Oracle nvarchar2(lengh t) to PostgreSQL varchar(lenght)

[Jean-Michel POURE]

Dear friends,

I studying the possibility to port Compiere CRM from Oracle to PostgreSQL. As
Compiere evolves nearly everyday in CVS, I would like to run the Oracle code
without (too much) modification.

Don't blame me, I know using search/replace works most of the times.

At first, I used CREATE TYPE syntax to map Oracle nvarchar2 to PostgreSQL
varchar type (see code #1). The code seems to be the equivalent of:
CREATE DOMAIN nvarchar2 as varchar;

Now I can create tables with nvarchar2 but not nvarchar2(lengh t).

Is there a way to map Oracle nvarchar2(lengh t) to PostgreSQL nvarchar or
nvarchar(lenght ) in PostgreSQL 7.3?

Are there plans to allow such mapping in the future using the CREATE DOMAIN
syntax?

Best regards,
Jean-Michel Pouré

*************** *************** *************** *************** **********
Code #1
--DROP TYPE nvarchar2 CASCADE;

CREATE OR REPLACE FUNCTION oracle_nvarchar 2in(cstring, oid, int4)
RETURNS nvarchar2 AS
'varcharin'
LANGUAGE 'internal' IMMUTABLE STRICT;
COMMENT ON FUNCTION oracle_nvarchar 2in(cstring, oid, int4) IS '(internal)';

CREATE OR REPLACE FUNCTION oracle_nvarchar 2out(nvarchar2)
RETURNS cstring AS
'varcharout'
LANGUAGE 'internal' IMMUTABLE STRICT;

CREATE TYPE nvarchar2
(INPUT=oracle_n varchar2in, OUTPUT=oracle_n varchar2out, DEFAULT='',
INTERNALLENGTH=-1, ALIGNMENT=int4, STORAGE=EXTENDE D);
COMMENT ON TYPE nvarchar2 IS 'Oracle type nvarchar2(lengt h) mapped to
PostgreSQL type varchar(lenght) ';
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