Hibernate: How to set NULL query-parameter value with HQL?

Question

How can I set a Hibernate Parameter to \"null\"? Example:

Query query = getSession().createQuery(\"from CountryDTO c where c.status = :status  and c.type =:t         


        

Answer 1

It seems you have to use is null in the HQL, (which can lead to complex permutations if there are more than one parameters with null potential.) but here is a possible solution:

String statusTerm = status==null ? "is null" : "= :status";
String typeTerm = type==null ? "is null" : "= :type";

Query query = getSession().createQuery("from CountryDTO c where c.status " + statusTerm + "  and c.type " + typeTerm);

if(status!=null){
    query.setParameter("status", status, Hibernate.STRING)
}


if(type!=null){
    query.setParameter("type", type, Hibernate.STRING)
}