Hibernate 用annotation写一个入门程序

1、在数据库中创建一张表：student   有字段  id  name  age

2、建一个java项目。名hibernateTest

3、导入所需的jar包。

4、写student的实体类。并在类名前一行加上：@Entity,在getId方法上加上@id

引入的类库是: import javax.persistence.Entity;

import javax.persistence.Id;

5、写配置文件：hibernate.cfg.xml

<?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/hibernatetest</property>

        <property name="connection.username">root</property>

        <property name="connection.password">root</property>

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

        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <property name="show_sql">true</property>

        <mapping class="com.wang.dao.Student"/>

    </session-factory>

</hibernate-configuration>

 

 

6、写一个测试类：

public class AnotationTest {

    public static void main(String[] args) {

        Student s = new Student();

        s.setId(1);

        s.setAge(11);

        s.setName("wang");

        Configuration cf = new AnnotationConfiguration();

        Session session=cf.configure().buildSessionFactory().openSession();

        session.beginTransaction();

        session.save(s);

        session.getTransaction().commit();

        session.close();

    }

}