Обсуждение: Why do I need to pass value for Serial type in Insert/Update?

I don't know if jdbc/java code requires this, but when I use two gui admin tools I found, and I insert a row into the
tableusing their row editor feature, both require me to enter a number for the Serial type. I thought this type was
usedto auto-increment an id field and that I would not need to enter anything into it? Basically we need the normal
indexedID field for each table, and we want it to auto-increment. The serial shows a function of nextVal() or something
likethat, so I assume it auto-increments, and it shows unique and not-null. Can someone explain how serial is used, why
wouldI still need to pass a value for it? 

Thanks.

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El Vie 12 Sep 2003 16:22, Duffey, Kevin escribió:
> I don't know if jdbc/java code requires this, but when I use two gui admin
> tools I found, and I insert a row into the table using their row editor
> feature, both require me to enter a number for the Serial type. I thought
> this type was used to auto-increment an id field and that I would not need
> to enter anything into it? Basically we need the normal indexed ID field
> for each table, and we want it to auto-increment. The serial shows a
> function of nextVal() or something like that, so I assume it
> auto-increments, and it shows unique and not-null. Can someone explain how
> serial is used, why would I still need to pass a value for it?

You have to take it off the insert list of columns.

id serial
name varchar(30)

You would do:

INSERT INTO table (name) VALUES ('Martín')

and the id value would be taken as the dafault, which is the next value of the
sequence.

--
Porqué usar una base de datos relacional cualquiera,
si podés usar PostgreSQL?
-----------------------------------------------------------------
Martín Marqués                  |        mmarques@unl.edu.ar
Programador, Administrador, DBA |       Centro de Telematica
                       Universidad Nacional
                            del Litoral
-----------------------------------------------------------------

On Fri, 12 Sep 2003, Duffey, Kevin wrote:

> I don't know if jdbc/java code requires this, but when I use two gui
> admin tools I found, and I insert a row into the table using their row
> editor feature, both require me to enter a number for the Serial type.
> I thought this type was used to auto-increment an id field and that I
> would not need to enter anything into it? Basically we need the normal
> indexed ID field for each table, and we want it to auto-increment. The
> serial shows a function of nextVal() or something like that, so I assume
> it auto-increments, and it shows unique and not-null. Can someone
> explain how serial is used, why would I still need to pass a value for
> it?

You can do this in a few ways.

create table test (id serial unique, info text, num int);
insert into test (info,num) values ('abc',123);
insert into test (id, info, num) values (DEFAULT,'abc',123);
insert into test values (DEFAULT,'abc',123);