[Monetdb-developers] Simple bat operations

darabi at web.de darabi at web.de
Thu Oct 11 14:34:15 CEST 2007


In the meantime, I have also tried all the bbp functions which
I could think of:

bbp.find
bbp.bind
bbp.take

But none of them gives me a bat which I can use. Strangely, none of
them says anything about whether the function call succeeded
or not.


Kambiz

----- Original Message -----
From: darabi at web.de
To: monetdb-developers at lists.sourceforge.net
Cc: "Niels Nes" <Niels.Nes at cwi.nl>
Sent: Donnerstag, 11. Oktober 2007 9.47 Uhr (GMT+0100) Europe/Berlin
Subject: Re: [Monetdb-developers] Simple bat operations

Niels,

thank you very much for your help.

How can I access this bat, when I start a new session?

bat.load("person_name");

doesn't seem to work. io.print(n):

ERROR = !TypeException:user.main[1]:'n' may not be used before being initialized


Thanks

Kambiz

----- Original Message -----
From: "Niels Nes" 
To: darabi at web.de
Cc: monetdb-developers at lists.sourceforge.net
Sent: Donnerstag, 11. Oktober 2007 9.38 Uhr (GMT+0100) Europe/Berlin
Subject: Re: [Monetdb-developers] Simple bat operations

On Thu, Oct 11, 2007 at 08:00:36AM +0200, darabi... wrote:
> Hello,
> 
> sorry for asking so many dumb questions, but I don't seem
> to be able to find the answers in the docs.
> 
> I try to create and persist a bat:
> 
> (mclient -d demo -l mal)
> 
> n := bat.new(:oid,:str);
> bat.setName(n, "person_name");
> bat.setPersistent(n, true);
> 
> bat.append(n, "John", true);
> bat.append(n, "James", true);
> 

replace this save
> bat.save(n);
by

transaction.commit();

Niels

(ps later you probably want to switch to subcommit, ie only commit those
bat that changed, for this see the documenation in the transaction module
(src/modules/mal/transaction.mx)
> 
> But this doesn't seem to be sufficient.
> 
> Or at least I then don't know how to load this bat the next
> time I start mclient.
> 
> Is there a file (one of the tests or sth.) which contains
> such basic tests? I tried to find-grep over them, but didn't
> succeed in finding what I was looking for.
> 


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