testdemo2.java

Hibernate中的映射例子

package test.m2m.demo;

import org.hibernate.Session;
import org.hibernate.Transaction;

import test.m2m.pojo.Employee;
import test.m2m.pojo.Project;
import test.m2m.sf.HibernateSessionFactory;

public class TestDemo2 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//插入雇员
		/*Session session=HibernateSessionFactory.getSession();
		Transaction tx=session.beginTransaction();
		Employee sanshu=new Employee();
		sanshu.setEid(5);
		sanshu.setEname("三叔");
		Project proj=(Project)session.get(Project.class, 3);
		sanshu.getProjects().add(proj);
		proj.getEmployees().add(sanshu);
		session.save(sanshu);
		session.update(proj);
		tx.commit();
		session.close();*/
		//插入项目
		/*Session session=HibernateSessionFactory.getSession();
		Transaction tx=session.beginTransaction();
		Employee emp1=(Employee)session.get(Employee.class, 1);
		Employee emp2=(Employee)session.get(Employee.class, 5);
		Project proj=new Project();
		proj.setPid(4);
		proj.setPname("中教集团网银项目");
		proj.setPdesc("");
		proj.getEmployees().add(emp1);
		proj.getEmployees().add(emp2);
		session.update(emp1);
		session.update(emp2);
		session.save(proj);
		tx.commit();
		session.close();*/
		//删除项目
		Session session=HibernateSessionFactory.getSession();
		Transaction tx=session.beginTransaction();
		Employee emp1=(Employee)session.get(Employee.class, 3);
		Employee emp2=(Employee)session.get(Employee.class, 4);
		Project proj=(Project)session.get(Project.class, 2);
		emp1.getProjects().remove(proj);
		emp2.getProjects().remove(proj);
		proj.getEmployees().removeAll(proj.getEmployees());
		session.update(emp1);
		session.update(emp2);
		session.delete(proj);
		tx.commit();
		session.close();
		System.out.println("OK");
	}

}