How do I dynamically create CriteriaQuery

I wan开发者_如何学Ct to create equivalent CriteriaQuery to this query : select u from User u where u.name = "John" and u.surname = "Black" and u.middlename = "Small"; but I have problem with "where" predicate. Thanks

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You can use:

CriteriaBuilder builder = entityManager.getCriteriaBuilder();
CriteriaQuery c = ...;
Root root = ...;

Predications name = builder.equal(root.get("name"), name);
Predications surname = ...;
Predications middlename = ...;

c.where(name, surname, middlename);