On 04/28/2011 10:46 PM, Basil Bourque wrote:
In PL/pgSQL, how does one generically access the fields of the OLD or NEW record? I've tried code such as this: 'NEW.' || quote_ident( myColumnNameVar ) || '::varchar' But when run by an "EXECUTE" command, I get errors such as: ERROR: missing FROM-clause entry for table "old" SQL state: 42P01 It seems that I cannot get PL/pgSQL to interpret the text of "NEW." + column name as text. My goal is to loop each field in a trigger, comparing the "OLD."& "NEW." values of each field. If different I want to log both values in a history/audit-trail table. Is there some way to loop the fields of a trigger's Record? I've read other people's frustration at not being able to get an array of fields from the Record. My approach is to fake it: Get the table's columns and data types by querying the meta-data tables (pg_attribute, pg_class, pg_type). But I cannot get "NEW." || colNameVar to be interpreted. Perhaps there is a better approach. If anyone is curious, my source code is pasted below. --Basil Bourque
We use plpythonu for this as the new and old structures are dictionaries. Sim -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
