hstore and populate_record

Hi All

Background, I have a table that i need to audit changes for
tracability etc. I found an example on one of the postgres lists to
use hstore:s to store the audit data. I find this to be a really good
idea since its really simple to implement and it works really well.

But now comes next step, how to get the data back from the hstore into
a record in the original format.

My two tables looks like this, first the table to be audited,
CREATE TABLE commissionbase
(
commissionbase_pkey integer NOT NULL,
salesorder character varying(20) NOT NULL,
salesmanid character varying(50) NOT NULL,
stockitem character varying(50) NOT NULL,
quantity double precision,
price numeric(15,2),
commission character varying(10),
commissionsum numeric(15,2),
CONSTRAINT commissionbase_pkey PRIMARY KEY (commissionbase_pkey ),
)

And then the audit table,
CREATE TABLE audit.audit_log
(
log_operation text,
log_old_values hstore,
log_new_values hstore,
log_table text,
CONSTRAINT audit_log_pkey PRIMARY KEY (log_id )
)

My problem,
SELECT * FROM public.populate_record(null::commissionbase,
(select log_new_values from
audit.audit_log where log_table = 'commissionbase' LIMIT 1));

This select works really well as long as i limit it to one record,
when i remove the limit restriction it dont work because the subquery
returns more then one record. Is it possible to rewrite to handle
multiple records, my sql knowledge is a bit to limited to figure out
how?

All input is greatly apreciated !

Thank you in advance !

Best Regards
Jan Eskilsson

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