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package org.example.repository; import org.example.entity.Classroom; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.Persistence; import javax.persistence.Query; import java.util.List; public class ClassroomRepo { private EntityManagerFactory emf; private EntityManager entityManager; public ClassroomRepo() { emf = Persistence.createEntityManagerFactory("default"); entityManager = emf.createEntityManager(); } public void saveClassroom(Classroom classroom) { entityManager.getTransaction().begin(); entityManager.persist(classroom); entityManager.getTransaction().commit(); } public Classroom getClassroomById(int id) { return entityManager.find(Classroom.class, id); } public List getAllClassrooms() { Query query = entityManager.createQuery("SELECT c FROM Classroom c"); return query.getResultList(); } public void updateClassroom(Classroom classroom) { entityManager.getTransaction().begin(); entityManager.merge(classroom); entityManager.getTransaction().commit(); } public void deleteClassroom(Classroom classroom) { entityManager.getTransaction().begin(); entityManager.remove(classroom); entityManager.getTransaction().commit(); } }