From: Rodrigo Sakai <rodrigo.sakai@zanthus.com.br>
To: 'Tom Lane' <tgl@sss.pgh.pa.us>
Cc: pgsql-interfaces@postgresql.org
Subject: RES: Creating a new type
Date: Thu, 29 Jun 2006 09:38:17 -0300
Message-ID: <000001c69b78$e5cfcee0$4700a8c0@TREEZANTHUS> (raw)
In-Reply-To: <15256.1151506785@sss.pgh.pa.us>
Ok, let me explain better! In my table example I will store datas like
Emp_id
emp_name
salary
emp_time
1
Rodrigo
1,200.00
(2006-jan-01, 2006-jun-01)
1
Rodrigo
2,100.00
(2006-mar-01, 2006-sep-01)
Considering the overlaps of emp_time and this question: what is the salary
of employee Rodrigo on 2006-apr-01 ??? This data is inconsistent because the
overlaps of time!
So, I have to guarantee that this situation doesn't occur! But I don't
want to use triggers because this check must be done on almost all tables
that uses the type:
CREATE TYPE time_interval (
Tbegin date,
Tend date
)
And be easy to the user. For example, any table that is created using this
type garantees that the overlaps will not occur! To do this I have to get
access for the past data of the table, and so, I have to know wich table is
using the type and have data being inserted!
Is that a way of doing this?
-----Mensagem original-----
De: pgsql-interfaces-owner@postgresql.org
[mailto:pgsql-interfaces-owner@postgresql.org] Em nome de Tom Lane
Enviada em: quarta-feira, 28 de junho de 2006 12:00
Para: rodrigo.sakai@zanthus.com.br
Cc: pgsql-interfaces@postgresql.org
Assunto: Re: [INTERFACES] Creating a new type
"Rodrigo Sakai" <rodrigo.sakai@zanthus.com.br> writes:
> So, when I execute an INSERT operation on this table, the functions that
> deals with this type need the id or name of the table that the data was
> inserted!
Why? Your example datatype doesn't seem to require any such thing.
> How can I get this ID or NAME inside this functions???
You can't. The question itself is bogus because it assumes that data
values only exist within tables. You could not have a transient value
of the datatype (eg, a function result) because that is not stored in
any table.
regards, tom lane
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To: pgsql-interfaces@postgresql.org
Cc: rodrigo.sakai@zanthus.com.br, tgl@sss.pgh.pa.us
Subject: Re: RES: Creating a new type
In-Reply-To: <000001c69b78$e5cfcee0$4700a8c0@TREEZANTHUS>
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