基本hibernate DEMO

Hibernate常用API：

1Configuration：

负责加载主配置文件信息，同时也加载映射关系文件信息。

2SessionFactory

负责创建Session对象。

3Session

数据库会话，负责增删改查操作。

4Transaction

负责事物控制

5Query

负责执行特殊查询

1新建java项目，加入导入jar包，直接导入myeclipse自带的hibernate library即可。另外，mysql jdbc的连接jar。

2entity类：

package cn.itcast.hibernate.domain;

import java.util.Date;

public class User {

    private int id;

    private String name;

    private Date birthday;

    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 Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

}

3user的配置文件,user.hbm.xml：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="cn.itcast.hibernate.domain">

    <class name="User">
        <id name="id">
            <generator class="native" />
        </id>
        <property name="name"/>
        <property name="birthday" />
    </class>
</hibernate-mapping>

4hibernate配置文件hibernate.cfg.xml

<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql:///test</property>
        <property name="connection.username">root</property>
        <property name="connection.password"></property>

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

        <property name="show_sql">true</property>
        <property name="hbm2ddl.auto">create</property>

        <mapping resource="cn/itcast/hibernate/domain/User.hbm.xml"/>

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

注意

<property name="hbm2ddl.auto">create</property>这个配置信息配置了这个，数据库才能根据hibernate配置，自动创建表。

5Base

package cn.itcast.hibernate;

import java.util.Date;

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

import cn.itcast.hibernate.domain.User;;

public class Base {
    public static void main(String[] args){

        Configuration configuration = new Configuration();
        configuration.configure();

        SessionFactory sessionFactory = configuration.buildSessionFactory();
        Session session = sessionFactory.openSession();

        Transaction tx = session.beginTransaction();

        User user = new User();
        user.setId(0);
        user.setBirthday(new Date());
        user.setName("A");

        session.save(user);
        tx.commit();
        session.close();
        System.out.println("end");
    }
}

6测试：

工程目录：