PL/SQL: loop on associative array

In package:

1	TYPE hash_type IS TABLE OF VARCHAR2(100) INDEX BY VARCHAR2(100);

In package body:

1 2 3 4 5 6 7 8 9

ze_assoc hash_type; BEGIN     my_col_name := ze_assoc.first;     LOOP         EXIT WHEN my_col_name is null;         my_string := my_string || ' OR ' || my_col_name || '=' || ze_assoc(my_col_name);         my_col_name := ze_assoc.next(my_col_name);     END LOOP; END;