Re: Generic Function

----- Original Message -----
From: <lucas(at)presserv(dot)org>
To: <pgsql-sql(at)postgresql(dot)org>
Sent: Monday, March 14, 2005 12:15 PM
Subject: [SQL] Generic Function

> Hi,
> Can I built a generic function like:
> CREATE FUNCTION f (text) RETURNS TEXT as
> $$
> return 'select * from $1';
> $$
> I know its impossible as writed. Also I have looked for EXECUTE procedure
> but it
> not run the correct function.

If you show us what you've tried and the results you received we may be able
to help more.

Some points:

1. To create a string to run with EXECUTE you would need to concatenate
the above phrase:

(Assuming "query" has been declared as text): query := 'Select *
from ' || $1;

2. Since you're likely returning multiple rows, you need to write your
function as a set-returning
function. See:

http://www.postgresql.org/docs/8.0/static/plpgsql-control-structures.html#PLPGSQL-RECORDS-ITERATING

and Executing Dynamic Commands in

http://www.postgresql.org/docs/8.0/static/plpgsql-statements.html#PLPGSQL-STATEMENTS-PERFORM

> Is there a way to construct this clause? Using plpgsql/pltcl/anything....
> ???
>
> Thanks
>
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