> De: pgsql-sql-owner@postgresql.org [mailto:pgsql-sql-owner@postgresql.org
<mailto:pgsql-sql-owner@postgresql.org>] En nombre de Xavier Bermeo
> Enviado el: Sábado, 16 de Agosto de 2008 14:54
> Para: pgsql-sql@postgresql.org
> Asunto: [SQL] Cursor
>
> Hi, guys.......
> I have problems with cursosrs.
> Anyone have an example complete the how load and read each position of a
cursor?
> I wait your answer........
> Thanks.......guys
Hi Xavier. This is a very simple example of a function with an implicit
cursor.
Regards,
Fernando.
CREATE OR REPLACE FUNCTION f_cursor() RETURNS void AS
$BODY$
DECLARE idx INTEGER;a mytable.col1%TYPE;b mytable.col2%TYPE; c mytable.col3%TYPE; d mytable.col4%TYPE;
BEGIN idx :=0;
FOR a, b, c, d IN SELECT col1, col2, col3, col4 FROM mytable ORDER BY col1 ;
LOOP -- Comment: Every iteration in loop will read a row from the cursor idx := idx + 1; raise
notice'Row %: [%, %, %, %]', idx, a, b, c, d; END LOOP; -- Comment: all rows have been read
END;
$BODY$ LANGUAGE 'plpgsql' VOLATILE;
