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package org.example.repository; import org.example.entity.Student; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.Persistence; import javax.persistence.Query; import java.util.List; public class StudentRepo { private EntityManagerFactory emf; private EntityManager entityManager; public StudentRepo() { emf = Persistence.createEntityManagerFactory("default"); entityManager = emf.createEntityManager(); } public void saveStudent(Student student) { entityManager.getTransaction().begin(); entityManager.persist(student); entityManager.getTransaction().commit(); } public Student getStudentById(int id) { return entityManager.find(Student.class, id); } public List getAllStudents() { Query query = entityManager.createQuery("SELECT s FROM Student s"); return query.getResultList(); } public void updateStudent(Student student) { entityManager.getTransaction().begin(); entityManager.merge(student); entityManager.getTransaction().commit(); } public void deleteStudent(Student student) { entityManager.getTransaction().begin(); entityManager.remove(student); entityManager.getTransaction().commit(); } }