oracle open for using

1DECLARE
2   TYPE EmpCurTyp IS REF CURSOR;  	-- define weak REF CURSOR type
3   emp_cv   EmpCurTyp;  			-- declare cursor variable
4   my_ename VARCHAR2(15);
5   my_sal   NUMBER := 1000;
6BEGIN
7   OPEN emp_cv FOR  				-- open cursor variable
8      'SELECT ename, sal FROM emp WHERE sal > :s' USING my_sal;
9   ...
10END;