ORACLE - example of pl/sql function (stored function)

Stored function takes two params and returns number value (0 when row is added):

function sql_addToFavorite( pUser in varchar2, pID in number ) return number
is
  iCount number;
begin
  /* exists ? */

  select count(*) into iCount
  from factory.cieb_an_sql_favorite
  where
  upper( c_user ) = upper( pUser ) and
  c_ID = pID;

  if iCount <> 0 then
    return( 1 );
  end if;

  /* add */

  insert into factory.cieb_an_sql_favorite
  ( c_user, c_id )
  values
  ( upper( pUser ), pID );

  commit;

  return( 0 );
end;