how to printf in oracle stored procedure (for debugging purposes)?

Question

I'm trying to debug a stored procedure (Oracle). I want to print some variables.

I don't know what the command to print is (or where to find it). Can anyone tell me what it is?

Thanks

EDIT:

This is my trigger:

create or replace
procedure bns_saa_confs_update_state (
  theID in varchar2
)
AS
begin
  UPDATE BNS_SAA_CONFIRMATIONS SET SentToWssStatus='T' WHERE ID=theID;
  commit;
end;

I want to print theID

Answer 1

Use the dbms_output.put_line() function:

declare
    my_var varchar2(20);
begin
    my_var := 'Hello World';
    dbms_output.put_line(my_var);
end;
/

Make sure you have set serveroutput on if running from SQLPlus, or set output on if running from an IDE. Some developers will create a wrapper function to simplify debugging.