Re: Dynamically update NEW columns in plpgsql trigger

On Sep 9, 2:21 am, dmit(dot)(dot)(dot)(at)gmail(dot)com (Dmitriy Igrishin) wrote:
> Hey Nick,
>
> You may do it with PL/pgSQL more easily with hstore module.
> Please, refer tohttp://www.postgresql.org/docs/9.0/static/hstore.html
> Please, look at the hstore(record) and populate_record(record, hstore)
> function. Hope this helps.
>
> And I think it will be more faster then you solution.
>
> Regards,
> Dmitriy
>
> 2010/9/9 Nick <nboutel(dot)(dot)(dot)(at)gmail(dot)com>
>
>
>
> > I need to dynamically update NEW columns. Ive been inserting the NEW
> > values into a temp table, updating them, then passing the temp table
> > values back to NEW (is there a better way?). Ive had success with this
> > method unless there is a null value...
>
> > EXECUTE 'CREATE TEMP TABLE new AS SELECT $1.*' USING NEW;
> > EXECUTE 'UPDATE new SET ' || dyn_col_name || ' = 1';
> > EXECUTE 'SELECT * FROM new' INTO NEW;
> > EXECUTE 'DROP TABLE new';
>
> > This last line...
> > EXECUTE 'SELECT $1.' || dyn_col_name INTO val USING NEW;
>
> > gives the ERROR: could not identify column "col_one" in record data
> > type.
>
> > However RAISE EXCEPTION '%',NEW.col_one;
> > returns "1" correctly.
>
> > If col_one does does not start out as a null value, then everything
> > works. Why does the passing from temp table back to NEW lose the USING
> > functionality?
>
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Thanks Dmitriy,

Im guessing that hstore(record) is not compatible with 8.4.4? I get an
error "cannot cast type record to hstore".

-Nick