Number of Bind variables passed AND Ref Cursor

Question

hi all
well i have an interesting problem
i need to construct a query for a refcursor besade on conditions....
as:
input params: in_lname and in_fname
sql_stmt := 'Select first_name, ' || 'last_name, ' ||
'from table1';
IF in_lname is not null then
-- we are selecting guests by Lastname, Lastname & Firstname,
-- Lastname & Firstname & Zip, or Lastname & Zip
sql_stmt := sql_stmt || 'where gc_last_name = :1 ';
IF in_fname is not null then
sql_stmt := sql_stmt || ' and gc_first_name = :2 ';
END IF;
END IF;
open fm_lom_cv for sql_stmt using in_lname, in_fname;
Now here the in_lname is required BUT in_fname can be NULL
hence we dont excute or create the sql with sql_stmt || ' and gc_first_name = :2 ';
so :2 will not be used
hence it gives error IF in_fname is null ie ORA-01006: bind variable does not exist
Please suggest how to handle it....
thanks

Answer 1

may you have to set a some variable to check
not perfect but somthing like this
declare
ct number:=1;
sql_stmt varchar2(150);
BEGIN
  sql_stmt := 'Select first_name, ' || 'last_name, ' ||
              'from table1';
IF in_lname is not null then
-- we are selecting guests by Lastname, Lastname & Firstname,
-- Lastname & Firstname & Zip, or Lastname & Zip
   sql_stmt := sql_stmt || 'where gc_last_name = :1 ';
   ct:=1;
   IF in_fname is not null then
      sql_stmt := sql_stmt || ' and gc_first_name = :2 ';
    ct:=2; 
    END IF;
END IF;
  case when ct=1 then
Open fm_lom_cv for sql_stmt using in_lname;
when ct=2 then
Open fm_lom_cv for sql_stmt using in_lname,in_fname;
end case;