Re: GET LAST ID INSERT

On Tue, 2003-09-23 at 09:24, Maurizio Faini wrote:
> there is a way to get last id inserted into db or i have to make a new
> query?

Typically, you will have created the table with a SERIAL column, whose
default value is taken from a sequence:

junk=# CREATE TABLE xxx (
junk(# id SERIAL PRIMARY KEY,
junk(# yyy TEXT
junk(# );
NOTICE: CREATE TABLE will create implicit sequence "xxx_id_seq" for
SERIAL column "xxx.id"
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index
"xxx_pkey" for table "xxx"
CREATE TABLE

Insert a row:
junk=# INSERT INTO xxx VALUES (DEFAULT, 'ljhldwtuy');
INSERT 1341077 1

Now get the value just created by the sequence:
junk=# SELECT currval('xxx_id_seq');
currval
---------
1
(1 row)

junk=# SELECT * FROM xxx WHERE id = 1;
id | yyy
----+-----------
1 | ljhldwtuy
(1 row)

Another way to do it, is to use the value returned by the INSERT
statement. If the table has oids, the first number returned (1341077 in
the example above) is the oid of the row just inserted. However, this
only works when a single row is inserted in a table with oids.

junk=# SELECT * FROM xxx WHERE oid = 1341077;
id | yyy
----+-----------
1 | ljhldwtuy
(1 row)

--
Oliver Elphick Oliver(dot)Elphick(at)lfix(dot)co(dot)uk
Isle of Wight, UK http://www.lfix.co.uk/oliver
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