Thread: Using autogenerated primary key in transaction
INSERT generates SERIAL primary key column value automatically. How to save this value for use in same transaction ? Only way I have found is to create temporary table. To emulate real database table for testcase I used command: create temp table test ( vmnr serial primary key, name text ) on commit drop; Then I tried CREATE TEMP TABLE savedkey ON COMMIT DROP AS INSERT INTO test ( name) select 'Scott' RETURNING vmnr; and CREATE TEMP TABLE savedkey ON COMMIT DROP AS SELECT * FROM (INSERT INTO test ( name) select 'Scott' RETURNING vmnr) dummy; but got syntax errors. lastval() in infected by triggers and nextval() requires hard-coded sequence name. How to get autogenerated primary key for >=8.0 servers ? If this is not possible then at least for PostgreSql versions which support ON COMMIT DROP and RETURNING clauses ? Andrus.
Andrus wrote: > > How to get autogenerated primary key for >=8.0 servers ? currval('sequencename')
In response to Andrus : > INSERT generates SERIAL primary key column value automatically. > > How to save this value for use in same transaction ? > How to get autogenerated primary key for >=8.0 servers ? There are some functions to get that value: test=# create table andrus(id serial primary key); NOTICE: CREATE TABLE will create implicit sequence "andrus_id_seq" for serial column "andrus.id" NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "andrus_pkey" for table "andrus" CREATE TABLE test=*# insert into andrus values (default); INSERT 0 1 test=*# select currval(pg_get_serial_sequence('andrus','id')); currval --------- 1 (1 row) HTH, Andreas -- Andreas Kretschmer Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header) GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431 2EB0 389D 1DC2 3172 0C99