WHILE expression giving Error 306, wrong number or types of args in call to

Question

WHILE expression giving Error 306, wrong number or types of args in call to '='
declare
     block_id block;
     item_id item;     
begin
     block_id := find_block(:system.cursor_block);
     item_id := find_item(:system.cursor_item);
     message('Current Block: ' || :system.cursor_block || '  Current Item: ' || :system.cursor_item);
     next_block;
     while find_block(:system.cursor_block) = block_id
     loop
          message('Current Block: ' || :system.cursor_block || '  Current Item: ' || :system.cursor_item);
          next_block;
     end loop;
exception
     when others then
     message(sqlerrm);
end;I don't see what the problem is?
Gus

Answer 1

other than that there are logical errors in this
u hav to use here != with the while loop.
Again loop willl never return to first block.It will stuck at last block and will show error.
For ur question u can use as
declare
     --block_id block;
     --item_id item;     
     vc_first_block varchar2(65);
begin
     vc_first_block := :system.cursor_block;
     --block_id := find_block(:system.cursor_block);
     --item_id := find_item(:system.cursor_item);
     message('Current Block: ' || :system.cursor_block || ' Current Item: ' || :system.cursor_item);
     next_block;
     while :system.cursor_block != vc_first_block
     loop
Message was edited by:
jeneesh