Hibernate学习笔记（一）之——根据配置文件自动创建表的两种方式（注解方式和配置文件方式）

环境准备：jdk  eclipse   hibernate、mysql jar包

jar包下载地址：https://pan.baidu.com/s/1dDRc9rfJDC47lIKqsRdD-A

项目截图：

---

Student是根据配置文件创建表，Teacher是根据注解创建表

Student.java

package com.java1234.model;

public class Student {
	private long id;
	private String name;
	public long getId() {
		return id;
	}
	public void setId(long id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	
}

Student.hbm.xml

<?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="com.java1234.model">
	<class name="Student" table="t_student"><!-- table="t_student" 对应数据库的表明 -->
		<!-- 主键 -->
		<id name="id" column="stuId">
			<generator class="native"></generator>
		</id>
		<property name="name"></property>
	</class>
</hibernate-mapping>

Teacher.java

package com.java1234.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

import org.hibernate.annotations.GenericGenerator;

@Entity
@Table(name="t_teacher")//映射表名
public class Teacher {
	
	private long id;
	private String name;
	
        //主键
	@Id
	@GeneratedValue(generator="_native")
	@GenericGenerator(name="_native",strategy="native")
	public long getId() {
		return id;
	}
	public void setId(long id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	@Override
	public String toString() {
		return "Teacher [id=" + id + ", name=" + name + "]";
	}
	
}

hibernate.cfg.xml      配置文件名称写死

<?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>

        <!--数据库连接设置 -->
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password">root</property>

       
        <!-- 方言 -->
        <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
	
        <!-- 控制台显示SQL -->
        <property name="show_sql">true</property>

        <!-- 自动更新表结构 -->
        <property name="hbm2ddl.auto">update</property>
        
  		<mapping resource="com/java1234/model/Student.hbm.xml"/><!- 根据配置文件自动建表 ->
		<mapping class="com.java1234.model.Teacher"></mapping><!- 根据注解自动动建表 ->
    </session-factory>

</hibernate-configuration>

HibernateUtil.java

package com.java1234.util;

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

public class HibernateUtil {
	private static final SessionFactory sessionFactory = buildSessionFactory();
	
	private static SessionFactory buildSessionFactory() {
		Configuration configuration = new Configuration().configure();//底层默认加载配置src目录下的hibernate.cfg.xml配置文件，所以配置文件名称写死
		ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();//实例化服务登记
		SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);//获取Session工厂
		return sessionFactory;
	}
	
	public static SessionFactory getSessionFactory() {
		return sessionFactory;
	}
}

测试类：执行测试类就自动创建了

package com.java1234.service;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

import com.java1234.model.Student;

public class StudentTest {
	private SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
	public static void main(String[] args) {
		Session session = sessionFactory.openSession();
		session.beginTransaction();//开启事务
		
		/*Student s = new Student();
		s.setName("张三");*/
		
		
		session.getTransaction().commit();//提交事务
		session.close();//关闭session
		sessionFactory.close();
	}
	
}