Creat Sequence / Auto generate No

Question

I created a from with master and detail block
In master block I assigned a field (FRNO) autogenerated
written the following code in pre-insert.
declare
          v_sr number(4):=0;
     begin
          select max(frno) into v_sr from fabric_rec ;
          if v_sr is not null or v_sr<>0 then
               :fabric_rec.frno:=v_sr+1;
          else
               :fabric_rec.frno:=1;     
          end if;
     exception
          when no_data_found then
          :fabric_rec.frno:=1;
     end;
it is working successfully.
I want to also create autogenerate no in detail block
first it check table, find Max NO then increament with it,
if I use above code that is not working becauase when I enter first record in frist row it will fetch Max record+1 and when I will go on 2nd row if will fetch same although I need
in first row Max+1
and row wise increament and save in database
Message was edited by:
Kami

Answer 1

Dear Uzair AOA
Your code is OK. but not for my situation.
I am using master and detail block. master in form and detial in tabular.
in MAster block it is working proerply, but in detail block It can not. I want that check the max no from detail block and add+1 with the row, if I inserted in detail 5 row that will generate recored accrodingly.
like. max(srno) = 5
I inserted 5 more record in detail
then replace with 6,7,8,9,10 like that.
see my following code.
I used the following code in detail block when create record
declare
          v_sr number(4):=0;
     begin
          select max(ojobno) into v_sr from sub_fabric_rec ;
                              if v_sr is not null or v_sr<>0 then
               :sub_fabric_rec.ojobno:= v_sr + :SYSTEM.cursor_record;     
                    else
          :sub_fabric_rec.ojobno:=1;     
          end if;
     exception
          when no_data_found then
          :sub_fabric_rec.ojobno:=1;
     end;
it is working but if I inserted 5 record in detail block first 2 rows Auto No are same??
and after 2nd row other reocords working accrodingly.
like
16
16
17
18
19
20 etc