hibernate简单使用

一.写javaBean
 

package org.hibernate.tutorial.domain;
public class Event {
	private int id;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}
}
  

二.编写xx.hb.xml文件
 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="org.hibernate.tutorial.domain">

    <class name="Event" table="EVENTS">
        <id name="id" column="EVENT_ID">
            <generator class="native"/>
        </id>
    </class>

</hibernate-mapping>

三.编写hibernate.cfg.xml文件
 

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/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/test?useUnicode=true&amp;characterEncoding=utf8</property>
        
        <property name="connection.username">root</property>
        <property name="connection.password">admin</property>

        <!-- JDBC connection pool (use the built-in) -->
        <!--<property name="connection.pool_size">1</property>-->

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- Enable Hibernate's automatic session context management -->
        <!--<property name="current_session_context_class">thread</property> -->

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</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="org/hibernate/tutorial/domain/Event.hbm.xml"/>

</hibernate-configuration>

四.建数据库表

五.测试

public class StudentTest {
	public static void main(String[] args) {
		Event s = new Event();
		Configuration cfg = new Configuration().configure("/hibernate.cfg.xml");
		SessionFactory sf = cfg.buildSessionFactory();
		Session session = sf.openSession();
		session.beginTransaction();
		//保存
		session.save(s);
		//查询
		List result = session.createQuery("from Event").list();

		session.getTransaction().commit();
		session.close();
		sf.close();
		
	}
}

-------------------------------------------------------------
建立annotation方式数据访问

一.编写Entity类
增加实体注解，交给hibernate管理，和主键注解

@Entity
public class Teacher {
	private int id;
	private String name;
	private String title;
	
	@Id
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
}

二.在hibernate.cfg.xml文件映射Entity类

引用

<mapping class="org.hibernate.tutorial.domain.Teacher"/>

三.测试
建立AnnotationConfiguration方式的配置解析

public static void main(String[] args) {
		Teacher t = new Teacher();
		t.setId(1);
		t.setName("xiaoxiao");
		t.setTitle("It's a new teacher!");
		Configuration cfg = new AnnotationConfiguration().configure("/hibernate.cfg.xml");
		SessionFactory sf = cfg.buildSessionFactory();
		Session session = sf.openSession();
		session.beginTransaction();
		session.save(t);

		session.getTransaction().commit();
		session.close();
		sf.close();
		
	}