businessservice.java

hibernate的经典练习

package com.ghy.test3;

import java.util.HashSet;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class BusinessService {
	public static SessionFactory sessionFactory;
	static {
		try {
			Configuration config = new Configuration();
			config.addClass(Courses.class);
			config.addClass(Students.class);
			sessionFactory = config.buildSessionFactory();
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
		}
	}

	public void saveCourseAndStudentWithCascade(String courseName , String studentName) {
		Session session = sessionFactory.openSession();
		Transaction ts = null;
		try {
			ts = session.beginTransaction();
			Courses courses = new Courses(courseName, new HashSet());
			Students students = new Students(studentName, new HashSet());
			students.getCourses().add(courses);
			courses.getStudents().add(students);
			session.save(courses);
			ts.commit();
		} catch (Exception e) {
			if (ts != null) {
				ts.rollback();
			}
			e.printStackTrace();
			// TODO: handle exception
		} finally {
			session.close();
		}

	}
	public void test()
	{
		saveCourseAndStudentWithCascade("政治","任玉华");
	}
	public static void main(String[] args) 
	{
		BusinessService obj = new BusinessService();
		obj.test();
		sessionFactory.close();
	}

}