From: Achilleus Mantzios <achill@matrix.gatewaynet.com>
To: Pedro Igor <pedroigor@aip.com.br>
Cc: pgsql-sql@postgresql.org
Subject: Re: SQL QUERY
Date: Tue, 3 Dec 2002 16:47:22 +0200 (EET)
Message-ID: <Pine.LNX.4.44.0212031639490.7057-100000@matrix.gatewaynet.com> (raw)
In-Reply-To: <000b01c29ad5$3fdc9f10$0b00010a@aip.com.br>
On Tue, 3 Dec 2002, Pedro Igor wrote:
> But i want implement a trigger that auto-increments the id field. This
> options is personal, i don´t like to depend from the database.
>
Then use table name as parameter to your function.
But trully its an error prone policy the one you try to follow,
what if a table has a primary key named "fobarid"??
Your function will not work correctly.
Or you could programatically read the system tables
and find out which column is the primary key for a given table.
But unfortunately that way you depend on the database
even worse than simply and nicely use sequences.
> Pedro Igor
>
> ----- Original Message -----
> From: "Achilleus Mantzios" <achill@matrix.gatewaynet.com>
> To: "Pedro Igor" <pedroigor@aip.com.br>
> Cc: <pgsql-sql@postgresql.org>
> Sent: Tuesday, December 03, 2002 11:05 AM
> Subject: Re: [SQL] SQL QUERY
>
>
> > On Tue, 3 Dec 2002, Pedro Igor wrote:
> >
> > > I have the following function:
> > > CREATE FUNCTION public.auto_incremento() RETURNS trigger AS '
> > > begin
> > > new.id = (select (max(id) + 1) from teste);
> > > return new;
> > > end;' LANGUAGE 'plpgsql'
> > >
> > > I created a trigger that uses this function, but i want to the function
> be usefull for all tables and not only to tbale teste.
> > >
> > > Someone know how ???
> >
> > Take a look at sequences.
> > (In Addition, they are autimatically created when a column is of type
> > 'SERIAL').
> >
> > >
> > >
> > >
> > > Pedro Igor
> > >
> > >
> > >
> > >
> >
> > ==================================================================
> > Achilleus Mantzios
> > S/W Engineer
> > IT dept
> > Dynacom Tankers Mngmt
> > Nikis 4, Glyfada
> > Athens 16610
> > Greece
> > tel: +30-10-8981112
> > fax: +30-10-8981877
> > email: achill@matrix.gatewaynet.com
> > mantzios@softlab.ece.ntua.gr
>
>
==================================================================
Achilleus Mantzios
S/W Engineer
IT dept
Dynacom Tankers Mngmt
Nikis 4, Glyfada
Athens 16610
Greece
tel: +30-10-8981112
fax: +30-10-8981877
email: achill@matrix.gatewaynet.com
mantzios@softlab.ece.ntua.gr
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To: pgsql-sql@postgresql.org
Cc: achill@matrix.gatewaynet.com, pedroigor@aip.com.br
Subject: Re: SQL QUERY
In-Reply-To: <Pine.LNX.4.44.0212031639490.7057-100000@matrix.gatewaynet.com>
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