Re: plpgsql: function throws error on second call!

On Fri, 26 Jul 2002, Janning Vygen wrote:

> i cant get it right on my own. i ve tried to find something in the
> bug reports and there was a bug with temp tables in functions years
> ago. but it was fixed..
>
> so here s my problem:
>
> CREATE FUNCTION testpunkte (int4) RETURNS int4 AS '
> DECLARE
> var_id ALIAS FOR $1;
> var_count int4 := 0;
> BEGIN
>
> CREATE TEMP TABLE temp_punkte AS
> SELECT * FROM tmp where id = var_id;
>
> UPDATE real
> SET val1 = temp_punkte.val1
> WHERE id = temp_punkte.id;
> GET DIAGNOSTICS var_count = ROW_COUNT;
> DROP TABLE temp_punkte;
>
> RETURN var_count;
> END;
> ' language 'plpgsql';

If you're going to create/drop a table in a function,
you'll want to use execute any time you're working with the
table, otherwise it'll cache the plan from the original table
that you've dropped.