Java Tutorial/JPA/Transaction

Commit a Transaction

File: Main.java

import java.util.Date;
import java.util.List;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.Query;
public class Main {
  static EntityManagerFactory emf = Persistence.createEntityManagerFactory("JPAService");
  static EntityManager em = emf.createEntityManager();
  public static void main(String[] a) throws Exception {
    
    em.getTransaction().begin();
    
    
    Student student = new Student();
    student.setId(1);
    student.setName("Joe");
    student.setDateOfBirth(new Date());
    student.setGender(Gender.FEMALE);
    
    em.persist(student);
    em.flush();
    
    Student st = em.find(Student.class, student.getId());    
    System.out.println(st);
    
    em.getTransaction().rumit();
    em.close();
    emf.close();
    
    Helper.checkData();
  }
}

Roll Back A Transaction

File: Gender.java

public enum Gender {
  MALE, FEMALE
}