Dynamic orderby in a procedure

Question

Hi All!
in the follow mentioned procedure is not working can u check up and please provide a solution.
Thanks
Shyam koti
create or replace procedure p1 (ordby varchar) as
type rdep is ref cursor;
curdept rdep;
drec dept%rowtype;
sqlstmt varchar(500);
begin
sqlstmt:='select * from emp order by :j';
open curdept for sqlstmt using ordby;
loop
fetch curdept into drec;
dbms_output.put_line (drec.deptno||' '||drec.dname||' '||drec.loc);
exit when curdept%notfound;
end loop;
end;

Answer 1

A bind variable substitutes a value, not the name of a column, so your query becomes something like
SELECT * FROM emp ORDER BY 'hiredate'which in effect gives no ordering at all.
How about
SELECT * FROM emp
ORDER BY DECODE(orderby, 'hiredate',hiredate, 'deptno',deptno ...);Or you could just construct the whole string dynamically by concatenating the value:
v_sql := 'SELECT * FROM emp ORDER BY ' || p_orderbyThis approach is in general less efficient and I would normally avoid it, but at least there are only a limited number of variations possible in this case.