Escape -- in createSqlQuery

The code is as follow:

sql = " select '--', staff_no from staff where staff_no = ?";
Session session2 = HibernateUtil.getCurrentSession();               
Query sqlQuery2 = session2.createSQLQuery(sql);             
sqlQuery2.setParameter(0, "04415");  //error in this line

When run, error

Caused by: org.hibernate.QueryParameterException: Position beyond number of declared ordinal parameters. Remember that ordinal parameters are 1-based! Position: 1

is thrown, I know this is caused by the ‘–’ in sql string, hibernate interpret it as sql comment!!

If I run

sql = " select '-', staff_no from staff where staff_no = ?";

no problem is found.

So how to escape the ‘–’ in hibernate createSqlQuery ?

I try to use

    sql = " select \"--\", staff_no from staff where staff_no = ?";
    sql = " select \\'--\\', staff_no from staff where staff_no = ?";
   sql = " select \'--\', staff_no from staff where staff_no = ?";

but all still thrown the same error.

org.hibernate.QueryParameterException: Position beyond number of declared ordinal parameters. Remember that ordinal parameters are 1-based! Position: 1