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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