Criteria JPA 2 with 3 tables

Question

I\'m trying to create a criteria to retrieve some objects from 3 tables (Associate, Update and Detail). A Detail has reference to Associate and Update, and an Update has ref

Answer 1

Each join takes you from the leftish type parameter to the rightish one. So, the details join of my code (second line) starts from fromUpdates, that is a Path, and creates something which is behind the scenes also a Path. From that, you can build other joins. Try this (code not tested):

Root fromUpdates = query.from(Update.class);
Join details = fromUpdates.join("details");
Join associate = details.join("associate");
List conditions = new ArrayList();
conditions.add(builder.equal(associate.get("associateId"), associateId));
conditions.add(builder.isNull(details.get("ack_date")));

TypedQuery typedQuery = em.createQuery(query
        .select(fromUpdates)
        .where(conditions.toArray(new Predicate[] {}))
        .orderBy(builder.asc(fromUpdates.get("updateId")))
        .distinct(true)
);