Re: CallableStatements - Mailing list pgsql-jdbc

Stuart,

That's pretty straight forward, just put it in a select statement

i.e. nextval('sequence') is really a stored procedure

select nextval('seqname') returns the next value of the sequence

Dave

-----Original Message-----
From: pgsql-jdbc-owner@postgresql.org
[mailto:pgsql-jdbc-owner@postgresql.org] On Behalf Of Stuart Robinson
Sent: Monday, November 26, 2001 12:48 PM
To: Barry Lind
Cc: email@gregorybittar.com; pgsql-jdbc@postgresql.org
Subject: Re: [JDBC] CallableStatements


But what do you do if you want to call a stored procedure and NOT get a
result?

On Mon, 26 Nov 2001, Barry Lind wrote:

> As Dave has said, since stored procedures in Postgres can only return
> a single value, there is little to be gained from CallableStatements
> that you can't already do with regular Statements or
> PreparedStatements.
>
> The way to call stored procedures in postgres is via a select
statement.
>   Thus to call procedure foo(), you would issue the query 'select
> foo()'.  Since this is a standard select statement, you can use either

> a regular Statement or PreparedStatement to get the result of this
> stored procedure.
>
> Having said that, if you wanted to contribute a CallableStatement
> implementation for postgres we would be glad to accept it.  Remember
> that this is an open source project, features get added by people who
> want or need them.  If you need CallableStatements implement them an
> submit a patch.
>
> thanks,
> --Barry
>
>
>
> Dave Cramer wrote:
>
> > Well, given that postgres doesn't support the notion of returning a
> > result set from a stored procedure; I'm not sure what benefit this
> > would be.
> >
> > Regards,
> >
> > Dave
> >
> > -----Original Message-----
> > From: pgsql-jdbc-owner@postgresql.org
> > [mailto:pgsql-jdbc-owner@postgresql.org] On Behalf Of
> > email@gregorybittar.com
> > Sent: Friday, November 23, 2001 6:47 PM
> > To: pgsql-jdbc@postgresql.org
> > Subject: [JDBC] CallableStatements
> >
> >
> > CallableStatements weren't in Postgres as of the last time I
> > checked, version 7.1.
> >
> > The JDBC specification has lots of goodies in it, such as examining
> > a server's metadata and sending cursors backwards and forwards over
> > result sets.  However, from the perspective of a Java programmer,
> > CallableStatements are essential tools for communicating with a
> > database server.
> >
> > Without the benefit of CallableStatements, all efforts at efficiency

> > are wasted.  The hallmark of any robust system is distributed
> > processing, which requires invoking stored procedures on foreign
> > machines.  Doing so through CallableStatements would
> > (a) accomplish work and (b) retrieve a result code in one logical
> > network transmission.  Without CallableStatements, retrieving the
> > result code not only requires more programming infrastructure, but
> > also taxes the application at runtime as the Java application tries
> > to discover what the result of the stored procedure was. This method

> > requires an additional deletion to purge the logged result code
> > record, lest the log grow, slowing searches. Therefore, we are
> > looking at considerably more processing done, 2 or 3 transmissions,
> > where 1 should suffice.
> >
> > Consequently, I would hope that CallableStatements are recognized as

> > a very important part of the JDBC puzzle.
> >
> >
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--
Stuart Robinson  [stuart@zapata.org]


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