What are Hibernate Criteria Queries?

Can you explain what Hibernate Criteria Queries are?

Hibernate Criteria Queries are a way to create database queries using a programmatic approach, allowing for dynamic query generation.

How do they differ from HQL or JPQL?

Unlike HQL or JPQL, which are string-based, Criteria Queries use a fluent API to build queries, making them type-safe and easier to refactor.

Can you give me an example of a simple Criteria Query?

Sure! For example, to find all users with age greater than 18, you can use:

CriteriaBuilder cb = session.getCriteriaBuilder();
CriteriaQuery<User> cq = cb.createQuery(User.class);
Root<User> root = cq.from(User.class);
cq.select(root).where(cb.gt(root.get("age"), 18));
List<User> results = session.createQuery(cq).getResultList();

What are the advantages of using Criteria Queries?

Some advantages include type safety, dynamic query generation, and easier maintenance of complex queries.