Dale,
> Now that OIDs have been deprecated in PostgreSQL, how do you find the key of
> a newly inserted record?
using OIDs as primary key was no good idea for some PostgreSQL versions
allready ... i.e. they really make dump & restore much more
challenging.
So usually us have something along:
CREATE TABLE feuser
(
id_user serial NOT NULL,
name text,
CONSTRAINT feuser_pkey PRIMARY KEY (id_user),
CONSTRAINT feuser_name_key UNIQUE (name)
)
WITHOUT OIDS;
which automatically creates a sequence for you and rewrites the serial
"id_user" with a default of
nextval('feuser_id_user_seq'::regclass)
So, to get the key of a record inserted, basically there are two
methods. (from now on "cs" is a DB-API 2.0 compliant cursor object,
i.e. from psycopg2
cn=psycopg2.connect(....)
cs=cn.cursor()
a) get id first, then insert
cs.execute("select nextval('feuser_id_user_seq'::regclass)")
newid=cs.fetchone()[0]
cs.execute("insert into feuser (id_user, name) values (%(id_user)s,
%(name)s)",
dict(id_user=newid, name="Karl Napf")
cs.commit()
-> now newid contains your new id.
b) create a serverside function on PostgreSQL:
CREATE OR REPLACE FUNCTION insfeuser (text)
RETURNS integer AS
$BODY$
DECLARE
result int4;
BEGIN
select nextval('feuser_id_user_seq'::regclass) into result;
insert into feuser (id_user, name) values (result, $1);
RETURN result;
END;
$BODY$
LANGUAGE 'plpgsql' VOLATILE;
within python:
cs.execute("select insfeuser(%(name)s)", dict(name="Karl Napf"))
newid=cs.fetchone()[0]
Hope that helps,
Harald
--
GHUM Harald Massa
persuadere et programmare
Harald Armin Massa
Reinsburgstraße 202b
70197 Stuttgart
0173/9409607
--
http://mail.python.org/mailman/listinfo/python-list
