What is HQL (Hibernate Query Language) in Hibernate 7?

// Basic HQL - uses entity class name, not table name:
List<Product> all = session
    .createQuery("FROM Product", Product.class)
    .getResultList();

// WHERE with named parameter:
List<Product> active = session
    .createQuery("FROM Product WHERE status = :status", Product.class)
    .setParameter("status", ProductStatus.ACTIVE)
    .getResultList();

// Constructor expression (DTO projection):
List<ProductSummary> s = session
    .createQuery(
        "SELECT new com.example.ProductSummary(p.id, p.name, p.price) "
        + "FROM Product p WHERE p.price < :max",
        ProductSummary.class)
    .setParameter("max", new BigDecimal("100"))
    .getResultList();

// JOIN on association fields:
List<Order> orders = session
    .createQuery("FROM Order o JOIN o.customer c WHERE c.email = :email", Order.class)
    .setParameter("email", "alice@example.com")
    .getResultList();

// Pagination:
List<Product> page = session
    .createQuery("FROM Product ORDER BY createdAt DESC", Product.class)
    .setFirstResult(0).setMaxResults(20).getResultList();

// Hibernate 7 new: regexp operator
List<Product> matched = session
    .createQuery("FROM Product WHERE name regexp :pattern", Product.class)
    .setParameter("pattern", "^(Laptop|Phone)")
    .getResultList();