CriteriaBuilder.and & CriteriaBuilder.or, how-to?

Question

I\'m trying to change the following HQL to use JPA Criteria:

select distinct d from Department d 
left join fetch d.children c 
where d.parent is null 
and (
            


        

Answer 1

Here's the where clause of your JPQL query:

where d.parent is null 
and (
    d.name like :term 
    or c.name like :term
    ) 

The where clause contains two predicates:

d.parent is null 

and

(d.name like :term 
 or c.name like :term)

The second predicate is an or containing two predicates:

d.name like :term

and

c.name like :term

So you need the same structure in your criteria query:

Predicate orClause = 
    cb.or(cb.like(root.<String>get("name"), param),
          cb.like(children.<String>get("name"), param));

c.where(cb.isNull(root.get("parent")),
        orClause);