Query query = entityManager.createQuery("SELECT e FROM Employee e WHERE e.salary > :salary"); query.setParameter("salary", 100000); query.setHint("javax.persistence.cache.retrieveMode", CacheRetrieveMode.USE); Listemployees = query.getResultList();
Query query = entityManager.createQuery("SELECT e FROM Employee e WHERE e.department = :department"); query.setParameter("department", "Sales"); query.setHint("javax.persistence.lock.timeout", 5000); Employee employee = (Employee) query.getSingleResult();In this example, we are creating a query to retrieve a single employee from the Sales department. We are setting a hint to set a maximum timeout of 5 seconds for the lock, which can prevent deadlocks and improve concurrency. These examples use the javax.persistence package library, which is part of the Java Persistence API (JPA) specification.