Обсуждение: PL/pgsql return resultset/cursor?

Is it possible to return a result-set or cursor from a PL/pgsql
procedure, like

CREATE OR REPLACE FUNCTION foo()
RETURNS <WHAT_TYPE>  AS '
BEGIN
        RETURN SELECT * from FOO;
END;
' LANGUAGE 'plpgsql';

If you open a cursor in a procedure, it gets closed when the procedure
exits, right?

Richard

Richard Emberson wrote:
>
> Is it possible to return a result-set or cursor from a PL/pgsql
> procedure, like
>
> CREATE OR REPLACE FUNCTION foo()
> RETURNS <WHAT_TYPE>  AS '
> BEGIN
>         RETURN SELECT * from FOO;
> END;
> ' LANGUAGE 'plpgsql';
>
> If you open a cursor in a procedure, it gets closed when the procedure
> exits, right?

    Cursors  get closed in PostgreSQL when you close them or when
    the transaction ends.

    Look at the  refcursor  data  type  (new  in  v7.2)  and  use
    transactions.


Jan

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Jan Wieck wrote:
> Richard Emberson wrote:
> >
> > Is it possible to return a result-set or cursor from a PL/pgsql
> > procedure, like
> >
> > CREATE OR REPLACE FUNCTION foo()
> > RETURNS <WHAT_TYPE>  AS '
> > BEGIN
> >         RETURN SELECT * from FOO;
> > END;
> > ' LANGUAGE 'plpgsql';
> >
> > If you open a cursor in a procedure, it gets closed when the procedure
> > exits, right?
>
>     Cursors  get closed in PostgreSQL when you close them or when
>     the transaction ends.
>
>     Look at the  refcursor  data  type  (new  in  v7.2)  and  use
>     transactions.

Here is a sample:

    create table aa(a int, b int, c int);
    create function f() returns refcursor as '
    declare
     r refcursor;
    begin
     open r for select * from aa;
     return r;
    end;' language 'plpgsql';

--
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  pgman@candle.pha.pa.us               |  (610) 853-3000
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Does anyone know how to return more than one value from pgsql script?
In the archieve I've found some email about it. Somebody suggested to create
a temporary table?
Could any one make a small smaple script for me? I have postgesql 7.1.

Kind Regards,
Yuri