Обсуждение: Fields

Charles Curi wrote:
> Hi people!!!
> I have a table called "orders" with fields "a","b" and "c".
> I want to make a INSERT only of fields "a" and "b" by Java and at
> this moment c=a*b; Is it possible?

I think you are saying you want your Java code to insert fields "a" and
"b" and have "c" automatically set to a value derived from "a" and "b".
If so, you can accomplish this with an insert trigger.

--
Guy Rouillier

On Wed, 2006-05-31 at 15:51 -0500, Guy Rouillier wrote:
> Charles Curi wrote:
> > Hi people!!!
> > I have a table called "orders" with fields "a","b" and "c".
> > I want to make a INSERT only of fields "a" and "b" by Java and at
> > this moment c=a*b; Is it possible?
>
> I think you are saying you want your Java code to insert fields "a" and
> "b" and have "c" automatically set to a value derived from "a" and "b".
> If so, you can accomplish this with an insert trigger.
>

Or you could just insert a, b and a*b yourself . . . . or am I missing
something here?

-- Mark

Hi,

Another solution may be a view as follows.

create table orders (a int, b int);
create view orders_v as select a, b, a * b as c from orders;

ebi

> -----Original Message-----
> From: pgsql-jdbc-owner@postgresql.org
> [mailto:pgsql-jdbc-owner@postgresql.org] On Behalf Of Mark Lewis
> Sent: Thursday, June 01, 2006 5:56 AM
> To: Guy Rouillier
> Cc: pgsql-jdbc@postgresql.org
> Subject: Re: [JDBC] Fields
>
>
> On Wed, 2006-05-31 at 15:51 -0500, Guy Rouillier wrote:
> > Charles Curi wrote:
> > > Hi people!!!
> > > I have a table called "orders" with fields "a","b" and
> "c". I want
> > > to make a INSERT only of fields "a" and "b" by Java and at this
> > > moment c=a*b; Is it possible?
> >
> > I think you are saying you want your Java code to insert fields "a"
> > and "b" and have "c" automatically set to a value derived
> from "a" and
> > "b". If so, you can accomplish this with an insert trigger.
> >
>
> Or you could just insert a, b and a*b yourself . . . . or am
> I missing something here?
>
> -- Mark
>
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