Question : autoincrement field problem

i have create a table, a sequence and a trigger to use an autoincrement column:
Table:
create table schema1.Document (
NumDoc Number,
NumProj char(10));
Sequence:
create sequence schema1.autoincrement
increment by 1
start with 1
minvalue 1
maxvalue 999999999
Trigger:
create trigger schema1.test
after insert on Document
begin
update Document
set NumDoc=autoincrement.nextval;
end;

when i try to insert records with:
insert into schema1.Document (Numproj) values ('hello');
it worked but when i see what i have insert, i have nothing in the auto-increment column:
select * from schema1.Document

NumDoc       Numproj
---------------------
                   1

if i try to insert
insert into schema1.Document (NumeroDoc, Numeroproj) values (autoincrement.nextval, 'hello');

i obtain
ORA-02289: the sequence does not exist


i don't understand, somebody can help me please???

Answer : autoincrement field problem

Hello reivilo,

I've used this script to create sequence and autoincrement trigger:

SET VERIFY OFF

CREATE SEQUENCE table1_s START WITH 1 NOCACHE;

DEFINE TRIGGER_NAME="TABLE1_BRI"
DEFINE TABLE_NAME="TABLE1"

ALTER TABLE &TABLE_NAME ENABLE ALL TRIGGERS;

CREATE OR REPLACE TRIGGER &TRIGGER_NAME
BEFORE INSERT ON &TABLE_NAME
FOR EACH ROW
BEGIN      

     IF ( :new.id IS NULL ) THEN
       BEGIN
          SELECT table1_s.NEXTVAL
          INTO :new.id
          FROM DUAL;
       EXCEPTION
         WHEN OTHERS THEN NULL;
       END;
     END IF;

EXCEPTION
  WHEN OTHERS THEN
      NULL;
END &TRIGGER_NAME;
/

SHOW ERRORS TRIGGER &TRIGGER_NAME

Hope this helps,
Paasky