Обсуждение: Returning with the inserted id

Hi all

A table was created with:CREATE TABLE test (    id integer,    nev varchar(25),    datum timestamp);

A sequence to hold the id was defined with:CREATE SEQUENCE "public"."test_azon_seq"    INCREMENT 1  MINVALUE 101
MAXVALUE9223372036854775807  START 101    CACHE 1;
 

The function wich allocates the id and defines the datum is:CREATE FUNCTION test_verif() RETURNS trigger AS
$test_verif$   BEGIN        select into NEW.id nextval('test_azon_seq');        NEW.datum := current_timestamp;
RETURNNEW;    END;$test_verif$ LANGUAGE plpgsql;
 

and the before insert trigger is:CREATE TRIGGER test_verif  BEFORE INSERT ON test  FOR EACH ROW  EXECUTE PROCEDURE
test_verif();


When I issue an insert (see below) how can I retrieve the
inserted value of id? I need something like Oracle's returns
for insert.

insert into "public"."test" (nev) values ('text');
-- 
László Graf

Graf László wrote:
>
> A sequence to hold the id was defined with:
>     CREATE SEQUENCE "public"."test_azon_seq"
>         INCREMENT 1  MINVALUE 101
>         MAXVALUE 9223372036854775807  START 101
>         CACHE 1;
>
> The function wich allocates the id and defines the datum is:
>     CREATE FUNCTION test_verif() RETURNS trigger AS $test_verif$
>         BEGIN
>             select into NEW.id nextval('test_azon_seq');
>             NEW.datum := current_timestamp;
>             RETURN NEW;
>         END;
>     $test_verif$ LANGUAGE plpgsql;

I take it this is just an example, because you could do this with
DEFAULTs on both columns.

> When I issue an insert (see below) how can I retrieve the
> inserted value of id? I need something like Oracle's returns
> for insert.
>
> insert into "public"."test" (nev) values ('text');

SELECT currval('public.test_azon_seq');

And yes, it will cope with multiple concurrent connections inserting.
--  Richard Huxton  Archonet Ltd