Generate a sequence

Question

Hi all,
I was wondering if you can help me here.
I am new to Oracle (having come from a SQL Server background) and I need to generate sequence numbers using a function.
This is the scenario
we have a table called APPS_CODES with columns CODE, VALUE
The values in this table are
213, Y
214, Y
215,N
We also have another table called SETCODES columns (ID, DESC)
values in this table are
2,AIR
3,BUS
4, TRAIN
Finally we have a sequence as follows
min value 1, maxvalue 9999999 cycle
Now what we require is a function that produces an id in the form
21320000001 to 21329999999.
this is how it needs to be generated:
It needs to select the min(CODE) from the APPS_CODE table where value=Y then concatenate this with the ID from set codes table where DESC=AIR then concatenate this with the sequence. The sequence should be left padded with 0s so as to start from 0000001.
Once the sequence reaches 9999999 then the APPS_CODE table needs to be updated and the current code should now have its value set to N so we can start using the next CODE where value=Y.
So when we reach 21329999999 the next value returned by the fucntion will be 21420000001 uptil 21229999999
Any help will be appreciated
thanks alot

Answer 1

I have created the function which seems to work fine.
However when it gets to the 3 record it fails with the following error message
GEN3
2674040000001
Elapsed: 00:00:00.00
15:59:15 test@CAMDEVF8> /
GEN3
2674040000002
Elapsed: 00:00:00.00
16:03:45 test@CAMDEVF8> /
select gen3 from dual
ERROR at line 1:
ORA-00904: "N3_V": invalid identifier
ORA-06512: at "TUNDE.GEN3", line 15
Any help.
Fucntion is below
Thanks
Create or replace
Function gen3
RETURN VARCHAR2 IS
l_v VARCHAR2(30);
n_v INTEGER;
n2_v VARCHAR2(30);
n3_v NUMBER;
BEGIN
     SELECT gen2.NEXTVAL INTO n_v
     FROM dual;
     SELECT value INTO n2_v FROM config_settings
     WHERE KEY='Airline Code';
     SELECT MIN(form_code) INTO n3_v FROM form_codes WHERE doc_type='EMCO' AND available='Y';
     l_v:=n2_v||n3_v||lpad(n_v,7,'0');     
     IF n_v=3
     THEN
     EXECUTE IMMEDIATE 'UPDATE form_codes SET available=''N'' WHERE form_code = n3_v;
     commit;
          END IF;
     RETURN l_v;
END gen3;
--grant execute on generate_document_number to cam_cust_role;