teacherdao.java

这是我自己做的一个选课系统

package org.hibernate.dao;

import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.beans.Student;
import org.hibernate.beans.Teacher;
import org.hibernate.criterion.Restrictions;
import org.springframework.orm.hibernate3.HibernateCallback;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

public class TeacherDAO extends HibernateDaoSupport{

	public boolean isValid(final String teacher_id, final String teacher_pwd) {
		List list = (List) getHibernateTemplate().execute(new HibernateCallback() {
			public Object doInHibernate(Session session)
					throws HibernateException {
				List result = session.createCriteria(Teacher.class).add(
						Restrictions.eq("teacherId", teacher_id)).add(
						Restrictions.eq("teacherPwd", teacher_pwd)).list();
				return result;
			}
		});
		if (list.size() > 0) {
			return true;
		} else {
			return false;
		}
	}

	public boolean isExist(final String teacher_id) {
		List list = (List) getHibernateTemplate().execute(new HibernateCallback() {
			public Object doInHibernate(Session session)
					throws HibernateException {
				List result = session.createCriteria(Teacher.class).add(
						Restrictions.eq("teacherId", teacher_id)).list();
				return result;
			}
		});
		if (list.size() > 0) {
			return true;
		} else {
			return false;
		}
	}

	public List findAllByUsername(final String teacher_id) {
		return (List) getHibernateTemplate().execute(new HibernateCallback() {
			public Object doInHibernate(Session session)
					throws HibernateException {
				List result = session.createCriteria(Teacher.class).add(
						Restrictions.eq("teacherId", teacher_id)).list();
				session.close();
				return result;
			}
		});
	}
	
	public void insertTeacher(Teacher teacher) {
		getHibernateTemplate().saveOrUpdate(teacher);
	}

	public void updateTeacher(Teacher teacher) {
		getHibernateTemplate().update(teacher);
	}

	
	public Teacher getTeacher(String teacherid) {
		return (Teacher) getHibernateTemplate().get(Teacher.class,
				new Integer(teacherid));
	}

	public List getTeachers() {
		return getHibernateTemplate().find("from Teacher");
	}

	public void deleteTeacher(String teacherid) {
		Object p = getHibernateTemplate().load(Teacher.class, new Integer(teacherid));
		getHibernateTemplate().delete(p);
	}
}