hibernate01 环境搭建

1、导包

2、数据库建模

3、创建持久化类（POJO）
注意：
①、需提供一个无参的构造器，因为hibernate使用反射来实例化持久化类（Constructor.newInstance()）
否则报错：
INFO: HHH000327: Error performing load command : org.hibernate.InstantiationException: No default constructor for entity: com.hibernate.domain.Customer

package com.hibernate.domain;
public class Customer {
    private int custID;
    private String custName;
    private String phone;
    private String address;
    public int getCustID() {
        return custID;
    }
    public void setCustID(int custID) {
        this.custID = custID;
    }
    public String getCustName() {
        return custName;
    }
    public void setCustName(String custName) {
        this.custName = custName;
    }
    public String getPhone() {
        return phone;
    }
    public void setPhone(String phone) {
        this.phone = phone;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public Customer(int custID, String custName, String phone, String address) {
        super();
        this.custID = custID;
        this.custName = custName;
        this.phone = phone;
        this.address = address;
    }
    public Customer() {

    }
}

4、创建映射文件（xxx.hbm.xml）

Customer.hbm.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
<hibernate-mapping>
    <class name="com.hibernate.domain.Customer" table="customer">
    <!-- name：对应的持久化类的全类名    table：对应的表名 -->

        <!-- 下面建立类中的字段 和 表中列的对应关系
        id：建立类中字段与表的主键之间的对应关系
            name：类中的字段名
            column：数据库中的列名

            generator：主键生成策略
        -->
        <id name="custID" column="cust_id">
            <generator class="native"></generator>
        </id>

        <!-- 
        property：建立类中字段与表中普通列之间的对应关系
            name：类中的字段名
            column：数据库中的列名
         -->
        <property name="custName" column="cust_name"></property>
        <property name="phone" column="cust_phone"></property>
        <property name="address" column="cust_addr"></property>
    </class>
</hibernate-mapping>

5、创建Hibernate核心配置文件（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>
        <!-- 数据库连接的基础配置，必须项 -->
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.password">password</property>
        <property name="hibernate.connection.url">jdbc:mysql:///hibernate1</property>
        <property name="hibernate.connection.username">root</property>

        <!-- 数据库方言(此处选为mysql) -->
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- 控制台是否打出sql -->
        <property name="hibernate.show_sql">true</property>
        <!-- sql语句是否格式化 -->
        <property name="hibernate.format_sql">true</property>

        <!-- 映射文件加载 -->
        <mapping resource="com/hibernate/domain/Customer.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

6、测试类

package com.hibernate.test;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
import com.hibernate.domain.Customer;
public class Test {
    @org.junit.Test
    public void test() {
        //1、创建Configuration对象，对应hibernate的基本配置信息和对象关系映射信息（即hibernate.cfg.xml 及 XXX.hbm.xml信息）
        Configuration configuration = new Configuration().configure();

        //2、 创建一个 ServiceRegistry 对象
        //hibernate 的任何配置和服务都需要在该对象中注册后才能有效.
        ServiceRegistry serviceRegistry = 
                new ServiceRegistryBuilder().applySettings(configuration.getProperties())
                                                    .buildServiceRegistry();

        //3、创建sessionFactory
        SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);

        //4. 创建一个 Session 对象
        Session session = sessionFactory.openSession();

        //5、 开启事务
        Transaction transaction = session.beginTransaction();

        //6、查询编码（主键）为1 的用户
        Customer customer = (Customer)session.get(Customer.class,1);
        System.out.println(customer);
        //7、提交事务
        transaction.commit();

        //8、关闭资源
        session.close();
        sessionFactory.close();

    }
}