Hibernate5.2.4Final学习（二）注解

采用注解(Annotation)的方式，建立类与数据库表单的关系，这时不需要写
与该类对应的hbm.xml文件。

新建一个Teacher类

package com.nick.testhibernate;

import javax.persistence.Entity;
import javax.persistence.Id;

@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;
	}



}

然后再src下的hibernate.cfg.xml文件中新增一句，具体如下

<?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/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password">123456</property>

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

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.MySQL5Dialect</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="com/nick/testhibernate/Student.hbm.xml"/>
        <!--  add new  -->
        <mapping class="com.nick.testhibernate.Teacher"/>

    </session-factory>

</hibernate-configuration>

最后建一个TeacherTest类

 package com.nick.testhibernate;

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



public class TeacherTest {
	public static void main(String[] args) {
		Teacher t = new Teacher();
		t.setTitle("Doctor");
		t.setId(1);
		t.setName("wang");

		Configuration cfg = new Configuration(); // 不用AnnotationConfiguration
		SessionFactory sf = cfg.configure().buildSessionFactory();
		Session session = sf.openSession();
		session.beginTransaction();
		session.save(t);
		session.getTransaction().commit();
		session.close();
		sf.close();


	}
}

测试前，需要再数据库中新建一个表，名为teacher，并添加相应的字段