Re: Help with INSERT into 2 tables

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CREATE TABLE a (id SERIAL PRIMARY KEY, name TEXT NOT NULL);
CREATE TABLE b (id SERIAL PRIMARY KEY,
key_a INTEGER REFERENCES a (id) ON DELETE CASCADE,
data TEXT);

> I want to insert related records to both table. The problem is that
> in order to insert record to the second table it's necessary to know
> a.id

Common question, and there's several possible answers. I'm going to break
slightly from the norm though. Postgres has some cool features, and since we
can stuff this logic into the database, we might just as well. So let's play
with them!

CREATE VIEW ab AS SELECT a.id, a.name, b.data FROM a,b WHERE a.id = b.key_a;
CREATE FUNCTION ab_insert (text, text) RETURNS INTEGER AS '
DECLARE newid INTEGER;
newname ALIAS FOR $1;
newdata ALIAS FOR $2;
BEGIN newid := nextval(''a_id_seq'');
RAISE NOTICE ''newid is %'', newid;
INSERT INTO a (id, name) VALUES (newid, newname);
INSERT INTO b (key_a, data) VALUES (newid, newdata);
RETURN newid;
END;' LANGUAGE 'plpgsql';
CREATE RULE ab_ins_rule AS ON INSERT TO ab DO INSTEAD
SELECT ab_insert(new.name, new.data);

I'd really like to figure out how to write a function that doesn't return
anything (a "procedure" for all you pedantic CS types). Oh well.
- --
Andrew G. Hammond mailto:drew(at)xyzzy(dot)dhs(dot)org http://xyzzy.dhs.org/~drew/
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"To blow recursion you must first blow recur" -- me
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