初识hibernate

新建名为test的数据库；新建实体类Student，属性有id，name

（1）Student.java

package com.java.model;

public class Student {

private int id;
private String name;

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;
}


}

(2)从官网下载hibernate源码包；在eclipse新建一个项目，在下载的源码包里面找到使用hibernate所需jar包，贴到项目里（连接mysql数据库所需jar包也贴进去）

 

 

(3)编写student实体对应的映射文件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.java.model">
<!--配置实体对应的相应字段-->
<class name="Student" table="t_student">主键id
<id name="id" column="stuId">
<generator class="native"></generator>  主键生成策略
</id>

<property name="name" column="stuName"></property>属性name

</class>

</hibernate-mapping>

（4）从官方文档找到配置文件hibernate.cfg.xml并适当修改配置，例如数据库连接驱动名，url等，并且把student.hbm.xml配置下

 

<?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/test</property>
<property name="connection.username">root</property>
<property name="connection.password">123</property>

 

 

 

<!-- SQL dialect 方言-->
<property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>

 

<!-- Echo all executed SQL to stdout 控制台显示sql语句 -->
<property name="show_sql">true</property>

 

<!-- Drop and re-create the database schema on startup 每次运行自动更新表结构-->
<property name="hbm2ddl.auto">update</property>

<!--映射文件配置-->
<mapping resource="com\java\model\Student.hbm.xml"/> 

</session-factory>
</hibernate-configuration>

 

（5）获取session，测试添加一个学生姓名

 

package com.java.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.java.model.Student;

 

public class StudentTest {

public static void main(String[] args) {
//实例化配置文件
Configuration configuration=new Configuration().configure();
//实例化服务登记:构造函数调用构建器配置configuration,返回服务登记类
ServiceRegistry serviceRegistry=new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
//构建SessionFactory
SessionFactory sessionFactory=configuration.buildSessionFactory(serviceRegistry);
//创建一个新的session
Session session=sessionFactory.openSession();
//开启事务
session.beginTransaction();

Student s=new Student();
s.setName("张三");
session.save(s);

//提交事务
session.getTransaction().commit();
session.close();//关闭session
sessionFactory.close();//关闭sessionFactory
}
}

运行结果，控制台显示。。。

自动生成的表结构

数据成功添加到数据库