Question

Need help in exception handling.
If I run this UPDATE script once it works, but when I run same script two or more times I receive the following error
“1 row updated. commited”
but it is not ok.
I want to receive exception.
“Note:Table is already updated”

UPDATE FBTB_TXNLOG
SET txnstageid = '-1',
LOCKED = 'N',
where xrefid = 'FJB1229000056689';
commit;

Answer 1

Try this solution:

SET SERVEROUTPUT ON -- need for dbms_output.put_line()
declare 
  cnt int;
begin
  -- if data exists 
  SELECT count(1)  
  INTO   cnt
  FROM   FBTB_TXNLOG
  WHERE   txnstageid = '-1'
  and  LOCKED = 'N'
  and xrefid = 'FJB1229000056689';

 if (cnt > 0 ) 
 then  
   -- exists: display message
   dbms_output.put_line('Table is already updated');  
 else
   -- let's edit 
   UPDATE FBTB_TXNLOG
   SET txnstageid = '-1',
       LOCKED = 'N',
   where xrefid = 'FJB1229000056689';
   commit;
 end if; 
end;
/