Auto Increment Feature

Question

Hello,
Can anyone help me, I am trying to implement auto increment using sequences and triggers. But I seem to run into rough weather.
CREATE TABLE "SCOTT"."tblCostCenterNum" (
     CostCenterNumID int NOT NULL ,
     CostNum int NOT NULL)
TABLESPACE "ADMS_DEFAULT_TS"
LOGGING;
CREATE OR REPLACE TRIGGER "SCOTT"."TEST"
BEFORE INSERT ON "SCOTT"."tblCostCenterNum"
FOR EACH ROW
BEGIN
INSERT INTO "SCOTT"."tblCostCenterNum"(costcenternumid) ((select "SCOTT"."tblCostCenterNum_seq".nextval from dual));
end;
insert into "SCOTT"."tblCostCenterNum" (costnum) values (1);
ERROR at line 1:
ORA-04091: table SCOTT.tblCostCenterNum is mutating, trigger/function may not see it
ORA-06512: at "SCOTT.TEST", line 2
ORA-04088: error during execution of trigger 'SCOTT.TEST'
ORA-06512: at "SCOTT.TEST", line 2
ORA-04088: error during execution of trigger 'SCOTT.TEST'
I dont seem to find a way to figure out this thing, b'cos the only way I fire the trigger is when I want to insert a new row and trigger should be working on that new row.
confused any expert's expertise is appreciated
Thanks
Srikanth

Answer 1

I know Justin is still around, but this thread is... 8 years old... so please, create your own thread, describing your environment such as database version in first place, and your problem.
Thanks for your cooperation.
Nicolas.
+-- for the safety, thread locked --+