Proper way of writing a HQL in ( ... ) query
HibernateHqlHibernate Problem Overview
Assuming that I want to write the following HQL query:
FROM Cat c WHERE c.id IN (1,2,3)
what is the proper way of writing this as a parametrized query, e.g.
FROM Cat c WHERE c.id IN (?)
Hibernate Solutions
Solution 1 - Hibernate
I am unsure how to do this with positional parameter, but if you can use named parameters instead of positional, then named parameter can be placed inside brackets and setParameterList method from Query interface can be used to bind the list of values to this parameter.
...
Query query = session.createQuery("FROM Cat c WHERE c.id IN (:ids)");
query.setParameterList("ids", listOfIds);
...
Solution 2 - Hibernate
Older versions of Hibernate may not have the setParameterList method on Query. You can still call setParameter("ids", listOfIds); on the older one for the same effect.
Solution 3 - Hibernate
Named parameters are better than positional parameters, we should be careful in looking at the order/position - while named is easy.
Named:
Query query = session.createQuery("select count(*) from User"+" where userName=:userName and passWord=:passWord");
query.setString("userName", userName);
query.setString("passWord", passWord);
Positional:
Query query=em.createQuery("SELECT e FROM Employee e WHERE e.empId = ? and e.empDepartment = ?");
query.setParameter(1, employeId);
query.setParameter(2, empDepartment);