hibernate 配置

1.配置 hibernate.cfg.xml   在src里面

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
	<session-factory>
		<!-- Database connection settings -->
		<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="connection.url">jdbc:mysql://localhost:3306/test</property>
		<property name="connection.username">root</property>
		<property name="connection.password">mysql</property>

		<!-- JDBC connection pool (use the built-in) -->
		<property name="connection.pool_size">2</property>

		<!-- SQL dialect -->
		<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
		<!-- Echo all executed SQL to stdout -->
		<property name="show_sql">true</property>

		<!-- Drop and re-create the database schema on startup -->
		<property name="hbm2ddl.auto">update</property>
		<mapping resource="ls/student/pojo/Student.hbm.xml" />
		<mapping resource="ls/teacher/pojo/Teacher.hbm.xml" />
	</session-factory>
</hibernate-configuration>

 2.配置pojo里面Teacher类的 Teacher.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC  
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping package="ls.teacher.pojo">
	<class name="ls.teacher.pojo.Teacher" table="Teacher">
		<id name="userid" column="userid" type="string" >
			<generator class="assigned"/>
		</id>
		<property name="name" column="name" type="string"></property>
		<property name="password" column="password" type="string"></property>
		<property name="age" column="age" type="string"></property>
	</class>
</hibernate-mapping>

3.数据操作 增删改查

package ls.teacher.dao;

import java.util.List;

import ls.teacher.pojo.Teacher;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class TeacherDao {
	private static  Teacher teacher = null;
	/**
	 * 添加老师
	 * @param password
	 * @return
	 */
	public Teacher addTeacher(String userid,String name,String password,String age){
		Configuration cfg =  new  Configuration().addResource("hibernate.cfg.xml");//初始化configuration配置文件
		SessionFactory sf = cfg.configure().buildSessionFactory();//建一个SessionFactory
		Session session =  sf.openSession();//打开Session
		Transaction transaction = session.beginTransaction();//开始一个事物
		try {
			teacher = new Teacher();
			teacher.setUserid(userid);
			teacher.setName(name);
			teacher.setPassword(password);
			teacher.setAge(age);
			session.save(teacher);
			transaction.commit();
		} catch (Exception e) {
			// TODO: handle exception
			transaction.rollback();
		}
		return teacher;
	}

	/**
	 * 通过id查询老师信息
	 * @param userid
	 * @return Teacher
	 */
	public Teacher selectTeacher(String userid){
		Configuration cfg =  new  Configuration().addResource("hibernate.cfg.xml");//初始化configuration配置文件
		SessionFactory sf = cfg.configure().buildSessionFactory();//建一个SessionFactory
		Session session =  sf.openSession();//打开Session
		Transaction transaction = session.beginTransaction();//开始一个事物
		String hql = "from Teacher teacher where teacher.userid=?";
		List<Teacher> list = null;
			try {
				list = session.createQuery(hql).setString(0, userid).list();
				System.out.println("pp:"+list.get(0).getPassword());
				transaction.commit();
				teacher = list.get(0);
			} catch (Exception e) {
				// TODO: handle exception
				transaction.rollback();
			}finally{
				session.close();
			}
		return teacher;
	}

	/**
	 * 更新老师密码	
	 * @return
	 */
	public boolean updateTeacher(String userid,String password){
		boolean flag = false;
		Configuration cfg = new Configuration().addResource("hibernate.cfg.xml");
		SessionFactory sf = cfg.configure().buildSessionFactory();
		Session session = sf.openSession();
		Transaction transaction = session.beginTransaction();
		String hql = "update Teacher teacher set teacher.password=? where teacher.userid=?";
		try {
			Query queryupdate = session.createQuery(hql).setString(0, password).setString(1, userid);
			queryupdate.executeUpdate();
			transaction.commit();
			flag = true;
		} catch (Exception e) {
			// TODO: handle exception
			transaction.rollback();
		}finally{
			session.close();
		}
		return flag;
	}

	/**
	 * 删除老师信息
	 * @return
	 */
	public boolean deleteTeacher(String userid) {
		boolean flag = false;
		Configuration cfg =  new  Configuration().addResource("hibernate.cfg.xml");
		SessionFactory sf = cfg.configure().buildSessionFactory();
		Session session =  sf.openSession();
		Transaction transaction = session.beginTransaction();
		String hql = "delete from Teacher teacher where teacher=?";
		try {
			Query querydelete = session.createQuery(hql).setString(0, userid);
			querydelete.executeUpdate();
			transaction.commit();
			flag = true;
		} catch (Exception e) {
			// TODO: handle exception
			session.close();
		}
		return  flag;
	}

}