Question

I’m writing a Criteria query using hibernate. I have a DTO object and I have to generate a query using its fields. Everyting seems fine when I create a disjunction like this:

Criteria c = s.createCriteria(Item.class);
        c.add(Restrictions.disjunction()
                .add(Restrictions.like("buyer", dto.getUser()))
                .add(Restrictions.like("rndEngineer", dto.getUser()))
                .add(Restrictions.like("logistics", dto.getUser()))
                .add(Restrictions.like("qaEngineer", dto.getUser()))
        );

But if I add an alias to my query to be able to do this:

Criteria c = s.createCriteria(Item.class);
        c.createAlias("wiEngineer", "we");
        c.add(Restrictions.disjunction()
                .add(Restrictions.like("buyer", dto.getUser()))
                .add(Restrictions.like("rndEngineer", dto.getUser()))
                .add(Restrictions.like("logistics", dto.getUser()))
                .add(Restrictions.like("qaEngineer", dto.getUser()))
                .add(Restrictions.like("we.sid", dto.getUser()))
        );

the where clause is fine but my result set is missing some elements. I think that Hibernate inner joins we on my item. Can I make Hibernate left join my alias somehow? I googled on it but to no avail.

Answer 1

Javadoc to the rescue:

Criteria createAlias(String associationPath,
String alias,
int joinType)
throws HibernateException

Join an association using the specified join-type, assigning an alias to the joined association.

The joinType is expected to be one of CriteriaSpecification.INNER_JOIN (the default),
CriteriaSpecification.FULL_JOIN, or CriteriaSpecification.LEFT_JOIN.

Why use Google when you have the javadoc and the Hibernate reference documentation available?