Criteria API - Using UPPER in a ElementCollection - api

Question

I have a class
#Entity
public class Person{
...
#ElementCollection
private Set<String> tags;
...
}
I want to use the JPA 2.0 Criteria API to search over these tags - but in a case insensitive way. Thus I want to both set the search parameter to UPPER and the column to UPPER (Pseudo-SQL: select p.* from Person p join Tags t on p.id=t.pId where upper(t.name)=upper('searchParameter'); )
Here is my code without the UPPER on the tags:
CriteriaBuilder builder = this.em.getCriteriaBuilder();
CriteriaQuery<Person> query = builder.createQuery(Person.class);
Root<Person> root = query.from(Person.class);
return this.em.createQuery(query.select(root).where(
builder.isMember(builder.upper(builder.literal(searchTag)),
root.get(Person_.tags)))).getResultList();
where searchTag is the input parameter.
How can I assign the UPPER to the Person_.tags "Column"?
In other words I want to write this Query with Criteria API:
SELECT p FROM Person p JOIN p.tags t WHERE UPPER(t) = UPPER('searchString')
Thank you

Answer 1

Ok, I finally have the solution:
cQuery.where(
builder.equal(
builder.upper(cQuery.from(Relation.class).join(Relation_.aliase)
.as(String.class)),
builder.upper(builder.literal(alias))
)
);
One has to use the ".as(..)" method.

Answer 2

suburbCriteria = criteriaBuilder.equal(
criteriaBuilder.upper(root.get(Property_.suburb)),
criteriaBuilder.upper(criteriaBuilder.literal(searchBean.getSuburb())));

Answer 3

You need to call upper and literal property name on joined Tags from Person.
CriteriaBuilder builder = this.em.getCriteriaBuilder();
CriteriaQuery<Person> query = builder.createQuery(Person.class);
Root<Person> root = query.from(Person.class);
Join<Person, Tag> tags = root.join(Person_.tags);
query.where(builder.isMember(
builder.upper(builder.literal(searchTag)),
builder.upper(builder.literal(tags.get(Tag_.name)))
));
return this.em.createQuery(query).getResultList();
I omitted query.select(root), not sure if it is required.
Tou can also omit builder.literal() on Tag_.name since is String.
If I am wrong somewhere, please edit my answer for further users.
Hope this helps.