(…) क्वेरी में एक HQL लिखने का उचित तरीका

80

यह मानते हुए कि मैं निम्नलिखित HQL क्वेरी लिखना चाहता हूं:

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 hql

— Robert Munteanu
स्रोत

130

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);
...

— Matej
स्रोत

11

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.

— Travis
स्रोत

5

Why has this been changed anyways? Just spent an hour figuring out why

IllegalArgumentException in class: org.ase.mip.persistence.entities.BaseEntityImpl, getter method of property: id (BasicPropertyAccessor.java:186))

was happening. I called setParameter instead of setParameterList. DOH!

— opncow

-4

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);

— Mittinti Ramana Murthy
स्रोत

3

Fully agree, but that does not answer my question about IN(...) queries

— Robert Munteanu