3、Hibernate的常用配置

1、关于hibernate.cfg.xml 文件的配置

<!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>
        <!-- 配置数据库的连接信息 -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLMyISAMDialect</property>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql:///student</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">1234</property>
        <!-- 显示调试的信息 -->
        <property name="show_sql">true</property>
        <property name="format_sql">true</property>
        <property name="hibernate.hbm2ddl.auto">update</property>
        <!-- 关联映射文件 -->
        <mapping resource="com/baowei/entity/Person.hbm.xml" />
    </session-factory>
</hibernate-configuration>

2、 关于Person.hbm.xml 文件的配置

<?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="com.baowei.entity">
    <class name="Person" table="person">
        <id name="id">
            <generator class="native" />
        </id>
        <property name="name" />
        <property name="money" />
    </class>
</hibernate-mapping>

 3、关于HibernateUtils的编写

package com.baowei.utils;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

public class HibernateUtil {
    private final static SessionFactory FACTORY = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {
        Configuration cfg = new Configuration().configure();
        ServiceRegistry serviceRegistry = new ServiceRegistryBuilder()
                .applySettings(cfg.getProperties()).buildServiceRegistry();
        SessionFactory factory = cfg.buildSessionFactory(serviceRegistry);
        return factory;
    }

    public static SessionFactory getSessionFactory() {
        return FACTORY;
    }

    public static Session openSession() {
        return FACTORY.openSession();
    }

    public static void close(Session session) {
        if (session != null)
            session.close();
    }
}