Stringsql="select p.permission_name from role r, role_permission rp, permission p where r.id = rp.role_id and p.id = rp.permission_id and r.role_name = ?";
Stringsql="select distinct p.permission_name from role r, role_permission rp, permission p where r.id = rp.role_id and p.id = rp.permission_id and r.role_name = ?";